ASME Vessel Standard - Suncor

. . . . Rev 9. Pressure Vessels ASME Section VIII. 1 and Div. 2 Page 3 of 66 . Standard 0601. 1 and Div. Div. Div. 2 Number: 0601 Revision: 9 Rev 9 Revision History This revision is a complete reformat to Std 0601 Rev 8 and includes requirements for pressure vessels to ASME Section VIII. 2 that was previously contained in Std 0602 Rev 1. Div.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. ............. 44 APPENDIX C – SUPPLEMENTARY REQUIREMENTS FOR VESSELS FABRICATED OF 2¼ Cr-1 Mo................................. Special Service Requirements...... 8 STANDARD ................................. 41 7........................ LIST OF APPENDICES......................................... Div....................2.................................................................................................................................................................................................. 3 Cr-1 Mo and 3 Cr-1 Mo-¼ V STEELS ...............................3............... APPROVED BY ....................................................................... Design Requirements...................... Rev 9........................................................... 5 REFERENCED STANDARDS......1.................................... 30 5......5......................................................... 2¼ Cr-1 Mo-¼ V.......................................................................................... 5 RESPONSIBILITIES.............. 1 and Div.............................................................................................................................................................. 42 APPENDIX B – SUPPLEMENTARY REQUIREMENTS FOR VESSELS FABRICATED OF 1 Cr-½ Mo and 1¼ Cr-½ Mo STEELS............................................... 41 APPENDIX A – TYPICAL FABRICATION MATERIALS ............................................................................................4..................... Inspection And Testing.............. 49 APPENDIX D – SUPPLEMENTARY REQUIREMENTS FOR HEAVY WALL VESSELS ...................................................................... 32 5.............................................. 5 DEFINITIONS AND ACRONYMS ......................... Div........................................... 41 9. 58 APPENDIX E – NOZZLE LOADS FOR VESSELS FABRICATED FROM STEEL ...........6...............................7.................................................................................................................................... 2................ Standard 0601.................................................................................................... IMPLEMENTATION............ 41 8........................................................................... General ................................. 27 5.................... 60 APPENDIX F – INTERPRETATIONS ..................... Pressure Vessels ASME Section VIII.................................................... 10 5............................................................................... 9 5................................ 2 TABLE OF CONTENTS Number: 0601 Revision: 9 PURPOSE AND SCOPE............................. 37 6............... 9 5..................................... 5............................. Fabrication ................................MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. INTERPRETATION AND UPDATING .............. 1 and Div.............................................................................. 41 10...................................................................................................................... 2 Page 4 of 66 .......................... Documentation and Approval Requirements ............................................................... Materials.................................................................................................................................................................... 64 1.............................................................................................................. 3.... 36 5............... ADDENDA ......... 4...... nondestructive examination. 2. 1 and Div.1. Project Engineering Manager 2.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. Responsible for approving and implementing this standard.4. 1.3.3. The following Suncor Energy Inc. Div. 2 Number: 0601 Revision: 9 1. fabrication process.1. REFERENCED STANDARDS 3.1. Suncor Standards and Drawings 3.2.3.2. Pressure Vessels ASME Section VIII. Responsible to ensure this standard is properly implemented when adopted for a project. Responsible to revise and update this Standard. inspection. 2. Div. RESPONSIBILITIES 2. Where there are different requirements within this standard due to specific requirements for service and/or materials being utilized. Standards are being used as references. Rev 9. The scope of this Standard is also applicable for category ‘H’ fittings as defined by CSA B51 for fittings installed in Canada such as pulsation suppression devices. The interpretations may be found in Appendix F and this is additional information to further explain the requirements of the relevant paragraph. filters. 2. strainers. inspection and testing of pressure vessels. Paragraphs that have interpretations associated with them are denoted by the letter INT in the left hand margin next to the paragraph number. Director Of Engineering 2.2. drain pots. and testing of pressure vessels fabricated in accordance with ASME Code Section VIII Div. The scope of this Standard supplement/clarify the requirements for mechanical design.1 and Div. instrument seal pots.2. 1. 1 and Div.4.1.1. the more stringent criteria shall be applied.1. Responsible to ensure the requirements of this standard are incorporated in the course of a project design. 2. The Standard is issued to establish uniform procedures and requirements for design.1. 3.1. Subject Matter Expert 2. STD 0213 STD 0214 STD 0300 STD 0301 STD 0302 STD 0603 Positive Material Identification (PMI) Painting Structural Engineering Criteria Design of Steel Structures Furnishing of Steel Structures Alloy Cladding Page 5 of 66 Standard 0601.1. fabrication. PURPOSE AND SCOPE 1. 1. Project Discipline Engineer 2. 2 . material selection.1. the requirements of CSA B51 shall also be met. For vessels installed in Canada.4. 6.2. Div. 1 and Div.2. Boiler. Industry Standards 3. 3.2.1.2.3.1.2.3. 3.3.2.2. 2 Page 6 of 66 .3. 3.2. 3.3.2.8.3. ASME CC 2235 3. Div.2. CSA Standards CSA B51 3. and Pressure Piping Code ASTM Standards ASTM E-112 ASTM E-165 ASTM E-21 Standard Test Methods for Determining Average Grain Size Standard Test Method for Liquid Penetrant Examination Elevated Temperature Tension Tests of Metallic Materials 3.2. 3.1. 3.2. D) Non-Destructive Evaluation Pressure Vessels (Division 1 and 2) Pipe Flanges and Flanged Fittings NPS ½ Through NPS 24 Forged Steel Fittings.1.2. 1 and Div.1. Rev 9.20 ASME B16.1.2.4.10.1.1.12.7.47 ASME SA-388 Power Boilers Material Specifications (Parts A.2.5.11 ASME B16. Spiral Wound & Jacketed Large Diameter Steel Flanges NPS 26 Through NPS 60 Standard Practice for Ultrasonic Examination of Heavy Steel Forgings Standard Specification for Straight-Beam Ultrasonic Examination of Steel Plates Standard Specification for Straight-Beam Ultrasonic Examination of Plain and Clad Steel Plates for Special Applications Use of Ultrasonic Examination in Lieu of Radiography Section I and Section VIII. 3.2.1. C. 3.2.2.Ring-Joint.1. Socket-Welding and Threaded Metallic Gaskets for Pipe Flanges .5 ASME B16.1.2.1.2.2.1. ASME SA-578 3.2. 3.2. Standard 0601.1.9.2. Pressure Vessels ASME Section VIII.1. 3.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. Divisions 1 and 2 3. 3. 3. ASME SA-435 3. Pressure Vessel.1. 2 STD 0903 STD 1003 PQA-GS-0019 Welding Requirements Fireproofing of Structures and Equipment Number: 0601 Revision: 9 Use of Advanced UT In Lieu of RT For Examination of ASME Code Section I and Section VIII Vessel Welds 3. B. ASME Boiler and Pressure Vessel Codes Section I Section II Section V Section VIII ASME B16.11. 3. 3.2. API 938 API 941 API 945 Standard 0601.2.3.3.4.6. API 934C 3.6.2.2. Div.3. and 3Cr-1Mo-1/4V Steel Heavy Wall Pressure Vessels for Hightemperature. 3.6.2.2.5.5.4.2.2.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.2.2. Div.5.5. 3. 3.5. 2 Number: 0601 Revision: 9 3. NACE RP0403 API Publications API 934A Materials and Fabrication of 2 1/4Cr-1Mo. 1 and Div.2.4. 3.4.2. Rev 9. 3. 2 1/4Cr-1Mo-1/4V.4.2.4. 3Cr1Mo. 3. WRC Bulletins WRC 107-79 WRC 297-84 WRC 305 WRC 275-82 Local Stress in Spherical and Cylindrical Shells Due to External Loadings Local Stresses in Cylindrical Shells Due to External Loadings on Nozzles Hydrogen Attack Limit of 2¼ Cr-1 Mo Steel The use of 2¼ Cr-1 Mo Steel for Thick Wall Reactor Vessels in Petroleum Refinery Processes – An Interpretative View of 25 Years of Research and Application 3. 3. 2 Page 7 of 66 .4.5.2.2.4.1.2.High-pressure Hydrogen Service Materials and Fabrication of 1 1/4Cr-1/2Mo Steel Heavy Wall Pressure Vessels for High-pressure Hydrogen Service Operating at or Below 825 °F (441 °C) An Experimental Study of Causes and Repair of Cracking of 1¼ Cr-½ Mo Steel Equipment Steels for Hydrogen Service at Elevated Temperatures and Pressures in Petroleum Refineries and Petrochemical Plants Avoiding Environmental Cracking in Amine Units 3. 3. Pressure Vessels ASME Section VIII.6.2.2. NACE Publications NACE 8X194 NACE MR0103 NACE MR0175 NACE RP0472 Material and Fabrication Practices for New Pressure Vessels Used in Wet H2S Refinery Service Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refining Environments Sulfide Stress Cracking Resistant Metallic Materials for Oilfield Equipment Methods and Controls to Prevent In Service Environmental Cracking of Carbon Steel Weldments in Corrosive Petroleum Refining Environments Avoiding Caustic Stress Corrosion Cracking of Carbon Steel Refinery Equipment and Piping 3.6.1. 1 and Div.5.2. 3.5.6. 3.1.2. Ed.4.R. 3.7. T.7. 3.7. Examination and Restoration” – Chicago Bridge and Iron Technical Services Company Equipment Design. professional engineer employed directly by Suncor responsible for the technical integrity of the project. S.7. Gulf Publishing Co. Ed. Div. Div. 3. “Owner’s Engineer” .2.7. Sakai.2. The “Supplier” . Upitis. Reference Books T. 1 and Div. Brownell.7.1. ASME International. ASME Code Section VIII Division 3 is not referred in the scope of this standard. 4. NACE International. The “Buyer” .2. 3.3. manufacturer. 3. 4. Krieger Publishing Co.6.8.10.R.1959 A Report on Residual Stress Effects Observed on Train “C” Regenerator C1C-5. Shadid.Journal of Materials Engineering and Performance Volume 10.2.. F. E.3.7.2.4.5. DEFINITIONS AND ACRONYMS 4. W. No. 2nd Edition Pressure Vessel Design Manual. Aug.7. 4. 3.1998 Pressure Vessel Design Handbook. “Code” means the rules presented in ASME Code Section VIII Division 1 and Division 2. 3.7. R.2. “Owner’s Inspector” .6. L.2.2.2. The “Owner” . 2001 Materials Selection for Petroleum Refineries and Gathering Facilities.7." 3.means a registered. Bechtel Co. 2 Page 8 of 66 . John Whiley & Sons.2.7. Original paper published in September 1951 "THE WELDING JOURNAL RESEARCH SUPPLEMENT. Iwadate E.11.means Suncor Energy Inc. 1997 Graphitization of Steels in Elevated Temperature Service . Kaups L. 1 and Div. vendor.means the entity. Pressure Vessels ASME Section VIII. 4. Straiton 3. Standard 0601.5. 2 Number: 0601 Revision: 9 3.9. Prescott T.means Suncor or its representative designated for that project. 3rd Edition Hydrogen Induced Cracking in 2¼ Cr-1 Mo Welds Prevention of Fracture in High Temperature / High Pressure Reactors Made of Cr-Mo Steels. fabricator.2. Foulds R.2. Rev 9. or contractor that supplies the material or services. Stresses in Large Horizontal Cylindrical Pressure Vessels on Two Saddle Supports. Nose J. 3.P.A White Henry Bednar Dennis Moss G.4. 3.. 4.7.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. Young Effect of Hydrogen on MPT and Dehydrogenation During Shutdown in Hydroprocessing Reactors.2.1. JSW research studies “Pressure Vessel Breakdown Prevention. Zick 4.2.7.means the company and/or person authorized for inspection. 5. NB-23 as allowed by regulations in a particular jurisdiction. 4.12. 5.14.1. 1 and Div.10. Rev 9. 4. Pressure Vessels ASME Section VIII.7. or regulations for the design. Div. Any alterations made on existing registered equipment shall be made in accordance with the requirements specified in the edition of the Code which was originally used for design and fabrication of the equipment. 5. 4.3. Modifications to these requirements shall require an approved deviation.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. Maintenance of pressure vessels may be permitted to other codes such as API 510 or National Board Inspection Code.13.8 to 4. The MDR shall refer to the latest revision of approved design.2. “General Service” – Any service that is different than the ones presented in paragraphs 4. this information shall be noted on the mechanical data sheets. “Cyclic Service” – Services in which the following conditions may occur. “Caustic Service” – Services containing sodium hydroxide (NaOH) or caustic potash (KOH).1. Standard 0601. any mandatory national. vessel drawings and/or technical specifications as applicable.9. vessel drawings and/or technical specifications as applicable. codes. Where the Owner's Engineer is required to provide information and or decisions within this standard. All pressure vessels shall be designed. rules.11. “Local Authorities” means the governmental regulatory authority controlling laws.4. 1 and Div. tested. MDEA or DGA used for H2S removal. 5. fabrication and testing of Pressure Vessels. “Hydrofluoric (HF) Acid Service” – streams containing hydrofluoric acid. and stamped in accordance with the latest edition of the ASME Code (see definition in paragraph 4. “Amine Service” – Services containing amines such as MEA.1. examined. All pressure vessels designated to operate in Canada and fabricated outside Canada shall be approved by the National Board of Boiler and Pressure Vessel Inspectors. General 5. “Sour Service” –This service is defined in Standard 0903. and local laws and the supplementary requirements provided in this Standard.6. 2 Number: 0601 Revision: 9 4. 5.6). All conditions of approval provided by Canadian Local Authorities shall be confirmed in the Manufacturer’s Data Report (MDR). • • • Operating pressure and/or temperature variations Forced vibrations Variations in external loads 4.1.8.13. inspected.1.1. 4. The requirements within this Standard represent Suncor's minimum technical requirements. 5. state. The requirements resulting from approved deviations shall be noted on the mechanical data sheets. Div. STANDARD 5. fabricated. “Hydrogen Service” – This service is defined in Standard 0903 4. DEA.1.1. 5. 4. 2 Page 9 of 66 . 7.10 x MOP or Pd = MOP + 25 [psig] where. INT Standard 0601.1. a. Design Pressure “Design Pressure” (Pd) – shall be considered as the Process Design Pressure and is the maximum pressure measured at the highest point of the vessel. The degree of flooding to be approved by Owner’s Engineer.1. shall be designed for the flooded condition. shall be designed to withstand an external pressure of 15 psi (103 kPag) [full vacuum]. 2 Number: 0601 Revision: 9 5.2. Div.2. 5. Vessels exposed to vacuum during normal operation. start-up. For vessels installed in Alberta.4. 5. Vessel subject to normal operating pressure and temperature and completely or partially flooded with liquid.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. Nozzle reinforcement required to withstand external pipe loads shall be considered as a potential limitation for MAWP. ii. shutdown.5. 5.1.2. b. The Design Pressure shall be provided in the vessel data sheet and in the fabricator documents.2. Design Requirements 5. Components of vessel envelope exposed to different operating pressures on both surfaces (such as intermediate heads or internal shells and heads of jacketed vessels) shall be designed to withstand the following two cases.1.2. Div. MAWP shall meet or exceed the vessel Design Pressure (Pd).1. 5. Page 10 of 66 5.2.1. b. Vessel subject to design pressure and temperature and filled with liquid up to the highest operating level. Vessel maximum allowable working pressure (MAWP) shall be determined by using the following restrictions.2. Rev 9. Horizontal vessels and vertical vessels designated to store liquid (such as surge/charge or storage vertical vessels). 1 and Div. shall be designed to withstand an external pressure of 7 psig (48 kPag) [half vacuum] at @ 100°F (38°C). MOP = Maximum Operating Pressure at the top of vertical vessels (or the top of the shell on horizontal vessels). 5. Vessels exposed to steam-out. 1 and Div. 2 .1. i. The following supplementary requirements shall be considered when establishing the design static head. as required by process conditions for normal operation. 5.1. Pd = 1.2. All other vertical vessels (such as fractionation towers) shall be designed to satisfy all of the following cases.2. Unless otherwise specified. Pressure Vessels ASME Section VIII. MAWP shall not exceed Pd. Pd of a vessel shall be selected as the maximum between.2.3. a. or any other transitory fluctuations.6.1. Div. or 100% of the specified minimum yield strength for austenitic steels or non-ferrous materials.4.9. 5. INT 5. 5.3.1.2.2. The MPT shall be established after determining the following information and the MPT shall be noted on the vessel datasheet and drawings. Rev 9. lowest ambient temperature. Standard 0601.1. b. b. Internal design pressure (applied on concave side) plus vacuum design pressure (if applicable) applied on convex side. shock chilling or auto refrigeration.2. 2 Page 11 of 66 .MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. MDMT is determined based on the lowest expected temperature in service taking into account the normal operation. shell not exceed 90% of the specified minimum yield strength for ferritic steels. For vessels where in-service metallurgical or hydrogen embrittlement is expected the MDMT shall be considered equal with the Minimum Pressurization Temperature (MPT) where MPT is considered the minimum temperature at which toughness of embrittled material meets the required design value.2. Pressure Vessels ASME Section VIII.2. 5. INT 5. 5.2. Maximum foreseen upset temperature.1. Determine if the equipment is located outdoor. a. 5. Div. Both the shop and field hydrotest pressures shall be determined based on vessel MAWP assuming that vessel is being corroded. Determine the minimum ambient temperature in the location where the equipment will operate. INT 5. The minimum design metal temperature (MDMT) shall be considered to be the minimum temperature at which the vessel can be subjected at combination of stresses greater than 30% of allowable stress Sa (or 20% if designed in accordance with Division 2) any time during the operating lifetime.2. 1 and Div. For vessels operating over 750°F (399°C) use maximum operating temperature plus 25°F (14°C).1.2. All pressure vessels (including their supports) shall also be designed for field hydrotest in erected position. 1 and Div. The maximum membrane stress generated in the vessel envelope during the hydrotest. Determine the minimum process operating temperature.2.8.2.2.10. b. Adherance to the MPT is not necessary for activities such as shop hydrotesting of new equipment where in-service embrittlement is irrelevant. For vessels operating up to 750°F (399°C) use maximum operating temperature plus 50°F (28°C). startup. a. On vessels where in-service metallurgical or hydrogen embrittlement is not expected. shutdown and other known or anticipated upset conditions. c. c.2.2. Design Temperature The design temperature shall be considered uniform across the entire vessel and shall be the maximum value of the following options. 2 Number: 0601 Revision: 9 a. External design pressure (applied on convex side) plus vacuum design pressure (if applicable) applied on concave side.2. 5. Temperature limit of the flange rating b. calculate “J” factor = (Si + Mn) x (P + Sn) x 10.8. k. Div 1. 5. As. MPT shall not be less than 100°F (38 °C). f.11.UCS-66 and UCS-66. refer to Figure 1 below. For guidance in determining the vessel MDMT. Determine if the equipment will be exposed to auto refrigeration (Joule Thompson effect) in the case of pressure fluctuations. Sn. 5. Determine the degree of embrittlement induced by atomic (nascent) hydrogen charged into vessels as a result of aqueous corrosion or Hydrogen Service. Determine the temperature drop induced by auto refrigeration.7. 2 Page 12 of 66 . Rev 9.6. j. e.2. obtain step cooling test results as described in Appendix C.2. Fig. Pressure Vessels ASME Section VIII. Determine if the mechanical properties of vessel pressure envelope will be affected by. a. h. For the base metal with the highest “J” factor. paragraph 3. Rapid modifications of pressure and temperature. Div. b. Determine the degree of embrittlement caused by carbon segregation (graphitization) in vessels operating at temperatures higher than 750°F (399°C). 1 and Div. Standard 0601. For weld metal with the highest “X” factor.1 or Section VIII. Div 2. Sb may occur). Div. using curves presented in ASME Code Section VIII. remains unchanged. g. For Cr-Mo alloys described in Appendix B (where embrittlement by precipitates may occur). Design temperature may be increased up to the lower of the following two values. Determine the impact exemption temperature of material. i. Excessive stress induced in the pressure envelope at temperatures below the Minimum Pressuring Temperature (MPT). 2 Number: 0601 Revision: 9 d. determine the toughness shift induced by the longest PWHT. For Cr-Mo alloys described in Appendix C (where embrittlement due to temper embrittlement from tramp elements P.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. a. 5. calculate “X” factor = (10 x P + 5 x Sb + 4 x Sn + As) / 100 for base and weld metal. MPT shall not be less than 100°F (38°C). The start up procedure shall protect the vessel from. which will induce crack propagation as a result of non-uniform stress distribution across vessel wall.2. Maximum temperature at which the allowable stress Sa of material used for pressure envelope.000 for base metals and “X” factor for weld metal.2.2.2. Determine the contribution of stress concentrations (including flaws) that are expected over the life of the vessel. Determine the toughness shift induced by the longest PWHT for the base or weld metal with the highest “X” factor as described in Appendix B. 1 and Div. Pressure Vessels ASME Section VIII. 2 MPT ≥ 100°F MPT2 = 100°F Determine temper embrittlement shift using step cooling test per API-934A to calculate MPT1 H2 Service No Yes Warm-up required before pressurization? MPT = Max (MPT1. 1 and Div. Carbon Steel ≤ 1¼ Cr. Equipment located outdoor? Yes Yes Carbon Steel ≤ 1¼ Cr. Div. 2 ≥ 2¼ Cr. MAJOR PROJECTS Pressure Vessels ASME Section VIII.Subject: Department: MDMT Determination Can material embrittlement occur? No Yes Temperature Embrittlement PROJECT SERVICES Exposure to Atomic Hydrogen Material Grade Material Grade Can autorefrigeration occur? No Figure 1 Standard 0601. MPT2) Is temperature ≤750°F Yes No Non H2 Service No 0601 9 Number: Revision: Corporate Technical Standard Adjust MDMT to reflect effects embrittlement due to Atomic Hydrogen MDMT=MPT Use Fig UCS 66 to establish MDMT MDMT=MPT Adjust MDMT to reflect effects embrittlement due to Temperature Embrittlement MDMT=MPT1 Use Fig UCS 66 to establish MDMT MDMT = lowest ambient metal temperature MDMT = autorefrigeration temperture Page 13 of 66 . ≥ 2¼ Cr. Div. Rev 9. 1 and Div. 3. internal support clips and rings. all insulation. external vacuum rings. all platforms and ladders. insulation rings and pipe support clips. “Operating Weight” – Consists of vessel “Empty Weight” plus the weight of operating product up to High Liquid Level and if applicable the weight of catalyst beds. 2 Page 14 of 66 .3. all internal and external welded attachments such as nozzles.2. DD00-M-111-1. International Building Code (IBC) Standard 0601. pipe supports.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. iii. Pressure Vessels ASME Section VIII.1. the trays shall be considered as flooded with liquid with an approximate depth of 2” (50 mm) for valve and bubble cap trays and 24” (610 mm) to 48” (1220 mm) for chimney trays. The selection of the attachments to be installed prior to erection shall be defined on case by case basis and shall be incorporated in the Construction Plan. c. ii. vessel supports.3. “Test Weight” – Consists of fully dressed vessel (except any catalyst or packing beds) plus weight of water flooding the vessel. ladders and platforms.8. the fireproofing.2. This weight is determined for the case of the field hydrotest. Horizontal vessels shall be provided with one top rectangular platform with the length equal with vessel tangent to tangent and the width not smaller than 4 ft (1. DD00-M-109-1. “Erection Weight” – Consists of vessel “Fabricated Weight” plus the weight of all demountable (bolted) internal and external attachments that will be installed before vessel erection (internals. 1 and Div. the lifting lugs as well as the foundation. The combination of the weights shall be determined for the following cases and noted on the vessel general arrangement drawing. portion of piping.2.2.Consists of fabricated weight of the vessel pressure envelope. Vessel Weight a. the supports. 1 and Div. b. 2 5. Number: 0601 Revision: 9 All vessels provided with internal refractory for cold wall design. 5. all pipe supports and the weight of the attached piping supported by vessel. The “Empty Weight” represents the weigh of the vessel ready for operation without any liquid level. The weights (dead loads) are impacting the design of the vessel pressure envelope. insulation. iv. Div.2. shall be externally painted with temperature indicating paint or alternative means of ensuring the equipment is not overheated as a result of internal refractory failure. “Empty Weight” – Consists of vessel “Erection Weight” and fully dressed with all internals including packing beds and grid supports (if applicable).2.2 m). all valves and instruments supported by vessel. Rev 9. i. Div. DESIGN LOADS The following loads shall be determined considering input from the Owner’s Engineer and/or process licensor as applicable. platforms shall be in accordance with drawings DD00-M-108-1. 5. 5. v. instruments and bolted lifting devices). For the purpose of estimating vessel weights. “Fabricated Weight” . In establishing the “Operating Weight”. Loads Induced By Wind And Earthquake a. Wind or seismic loads as well as the design methods are presented in the governing national codes such as National Building Code (NBC). The piping loads given in Appendix E shall be used in the design of nozzles. Once actual piping loads have been established. Stress analysis in accordance with the method presented in WRC 107 and WRC 297 for junction between the nozzle and vessel envelope (shell and heads). For vessels designed in accordance with ASME Section VIII. + 2 x IT + OHP Where ‘K’ shall be considered as follows. 1 and Div. the gravity loads and the loads induced by wind or earthquake.D. Pressure Vessels ASME Section VIII. Effective diameter = K x Vessel O. Div. If the design of the platforms is not fully defined at the time when the Purchase Order is issued.2. jurisdictional requirements shall also be considered. The stress levels in the pressure envelope shall be limited to values not exceeding the requirements presented in Figure 5. Maximum tower H/D ratio shall not exceed 33. b. d. The towers with H/D ratio exceeding 15 shall also be verified for buckling due to axial compression in accordance with Code Case 2286. On towers with height-to-diameter ratio (H/D) exceeding 10. The pipe loads shall be considered acting simultaneously with the internal pressure/vacuum. Div. c. i. b.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.2 1. The external attachments (platforms. These pipe loads consist of a combination between pipe gravity (including the weight of fluid and insulation) as well as forces and moments induced by thermal expansion/ contraction of the piping system or by spring type supports. nozzle designs shall be reassessed to ensure allowable stress levels are not exceeded. Standard 0601. Further to this. Rev 9. 2 Number: 0601 Revision: 9 and ANSI/ASCE Standard 7-98.3. with the following additional interpretations. As acceptable alternate provide FEA. 1 and Div. e. the effect of external attachments shall be approximated by considering an increase of the vessel size as follows. K 1. 2 Page 15 of 66 .5 1.1 the value of ‘S’ shall be considered as maximum allowable stress for Div. Div. 5. ii. Div. piping and insulation) have to be considered as a part of surface exposed to wind as well as an element in establishing of shape factors. the vortex shedding effect shall be taken in consideration.3. Loads Induced By Piping a.1.1 of ASME Code Section VIII. ladders.2.15 IT = OHP = Vessel diameter [ft] <5 5-9 >9 Insulation thickness [ft] Outside diameter of the insulated overhead pipe [ft] c. This stress analysis shall be provided on all nozzles connected with piping (process connections). 2.2. Div. 1 and Div. 5.2. Evaluate the capacity of overall vessel envelope and skirt support (where applicable) to withstand the collapse induced by bending moments during erection. 1 vessels. Div. the evaluation shall include the following requirements. For ASME VIII Div. 2 . 1 the maximum stress ‘S’ shall be limited to maximum allowable stress in accordance with Div. Div. FE analysis shall be provided to determine the local stress induced by the cycle.2.4. If applicable.2 (Screening Criteria for Fatigue Analysis) from ASME Code Section VIII. Standard 0601. Div.2.5. Rev 9. internal ring supports attached on shell or transitions between vessel envelope and supports.5.5.3 (Fatigue Analysis Screening. transitions between shells and heads. The loads induced by special internal and external attachments such as chimney/accumulator trays or “stab-in” reboilers shall be considered as concentrated gravity loads present during the operation case.2.4. 2 Number: 0601 Revision: 9 5. Depending of design configuration this analysis can be performed by using the method presented in WRC 107 and WRC 297. Stress evaluation in the junction between vessel envelope and supports.2. 5. a. 5.5. 5.1. 1 and Div. Cyclic Loads The effect of cyclic loads shall be evaluated for vessels in cyclic service. The design data shall include the range of load variance as well as the number of cycles estimated to occur during vessel operating lifetime. 2 except that for vessels designed in accordance with ASME Section VIII. 5.1 of ASME Code Section VIII.2. 2 exposed to cyclic loads shall be assessed for fatigue evaluation in accordance with paragraph 5. 5. 1 and Div.4. Method A) except that a limit of 1000 cycles maximum shall be used for all situations.1.5. the eccentricity of these loads shall be specified. both vessel envelope and skirt support (where applicable) shall be designed to withstand the erection loads. Pressure Vessels ASME Section VIII.4. Depending of design configuration this analysis can be performed by using the method presented in WRC 107 and WRC 297 or FE analysis.3.2.11) for saddle supports.4. 1.2. The stress levels in the pressure envelope shall be limited to values not exceeding the requirements presented in figure 5. the assessment shall be per paragraph 5. Div. 5.4.5. If attached on shell or head. As a minimum. Stress analysis in accordance with the requirements presented in WRC 107 and WRC 297 for junction between the clips required for pipe supports and vessel envelope (shell and heads). Examples of this include junctions between nozzles and shells/heads. Loads Induced By Other Attachments The loads induced by lifting devices are impacting the design of the vessel pressure envelope and skirt supports.2.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.5.2. local stress analysis shall be performed around the attachment point.3. Unless otherwise specified. The analysis shall be performed in any restrained portion or gross discontinuities of the pressure envelope.7. All vessels designed in accordance with ASME Code Section VIII.4.5.2. 5.5. As acceptable alternate provide FEA. Page 16 of 66 5. Div. FEA or any other specialized method such as Zick’s analysis (reference 3.2. b.2.2. 5. Div.7. i. Erection Loads The design of both lifting and tailing lugs shall consider the weight of fully dressed vessel including all welded internals. ii.2. The loads due to erection shall not be considered as self limiting.000 lb and lower. local circumferential bending.5. 5.1.6.3.7. The rigging impact factor shall be considered as follows. Impact factor value equal with 1. 5. Number: 0601 Revision: 9 Vessels designed in accordance with ASME Code Section VIII. Standard 0601. b. The maximum local membrane stress intensity shall not exceed 66% of the material yield strength.2. platforms.1.5 for all total lifting weight over 200. Div.0 1. ladders as well as parts of external piping system.5. Unless otherwise specified by client or process licensor. 1 and Div. insulation. Maximum local stress induced in shells. Vertical force Fv shall be considered as acting in addition to the shipping weight. 2 exposed to progressive distortion as a result of cyclic loads (such as coker drums) shall be evaluated in accordance with paragraph 5.7. Pressure Vessels ASME Section VIII. Type of transportation Ocean Rail Road 5.11) or alternate FE analysis may be used for this investigation. 5. Div.6. a. c. iii. Div.5 1. Transportation Loads The typical accelerations factors to be considered during the vessel transportation are per Table 1 below.5 2.0 1.5 0.6 of ASME Code Section VIII. bolted internals.6. Rev 9.8 for all total lifting weight of 200. 5. 2 5. The combination of primary membrane and bending stresses shall not exceed 90% of material yield strength.2.6. c.2. The calculated forces shall be considered as acting in vessel center of gravity (CG). a.5 1. Fr = Kr x W where W is the shipping weight 5. Zick analysis (reference 3.2. 2 Page 17 of 66 . Impact factor value equal with 1. heads or skirt supports during erection shall be limited as follows. The forces shall be determined as. 1 and Div.0 1. 2. 1 and Div.6.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. P.2.000 lb.6.5 5. Fv = Kv x W. Fa = Ka x W. All vessels supported by saddles or shipping saddles or other type of shipping supports shall be investigated for buckling.2.2.2.2. the L.0 1. and shear stresses.4. b. Table 1 Amplification factors (Impact factors) Axial direction Vertical direction Radial direction Ka Kv Kr 1. spherical. or dished shape. Additionally.4. Page 18 of 66 5. 1 and Div.1. which are part of pressure envelope. Minimum thickness of corroded spherical heads shall be the greater of. The girth flanges shall be designed to withstand the combination of the internal pressure/vacuum and the bending moment induced by wind. The following additional criteria shall be considered in calculating the required thickness of vessels and supports. the L. All heads shall be provided with an integral cylindrical transition with a length not smaller than 2” (5 mm) or 1. P.2. For columns provided with trays the maximum deflection shall be limited to H/200. 2 5. 5.8. D + 100 Kor K3/16" (5 mm) 1000 Where D = Vessel diameter (either external or internal) [in] 5.5 x plate thickness.2. shall be formed in elliptical. Div. Unless otherwise specified. 2 .8. Rev 9.2. 1 and Div.9. This option can be applied only if the vessel is equipped with trays but not with packing or catalyst beds. c.2. a.9. Number: 0601 Revision: 9 Temporary bracing may be considered to address stresses during erection of vessels. packing or catalyst beds. Maximum deflection of general vertical vessels shall not exceed H/100 when exposed to any combination of loads except of seismic loads. NOTE: Dimension ‘H’ shall be considered to be the height from the base of the support ring to the top of the vessel. shall be provided with a top bolted cover.2. Requirements For Design Of Heads And Conical Transitions All heads. Pressure Vessels ASME Section VIII. The 2:1 ellipsoidal heads are preferred.2. earthquake and piping loads.2. 5. D + 200 Kor K3/16" (5 mm) 2000 Where D = Vessel diameter (either external or internal) [in] 5.2.8.2. 5. internals shall be designed in accordance with the following options. and shear stresses.9. Requirements For Design Of Cylindrical Shells Minimum thickness of corroded cylindrical shell and dished heads shall be the greater of. The whole tower shall be designed in bolted subsections separated by girth flanges.1.2. 5. local circumferential bending.7.3. The whole internals shall be designed as a removable cartridge from the top of the tower. Standard 0601. All horizontal vessels supported by saddles shall be investigated for buckling.2. Zick analysis may be used for this investigation.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.8. a. 5. b.8. Div. All vertical vessels with a diameter of 36” (914 mm) and smaller equipped with trays.2. b. 5. Only on vessels where PWHT is not required.10.2. Only on vessels designed in accordance with ASME Code.3. a.10. Div. Page 19 of 66 Standard 0601.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. 1 and Div. Design to be in accordance with Figure UW13. Heads shall have the same inside diameter as the adjoining shell course when cladding or applied lining is specified. Nozzles with a size equal with NPS 1¼”. 2 . d.5.2. Code Case 2261 shall not be used.2. Rev 9. Div.6. a. 5.7. Intermediate heads required to separate two vessels may be used under the following restrictions. 2 5. b. the stress analysis shall also include an evaluation of pressure envelope buckling induced by lugs. The attachment weld shall be full penetration. Flange bolt holes shall straddle the north/south centerline in the plan and the vertical centerline in the elevation. 2½”.4. 3½” and 5” b. 5.10.1. legs. Number: 0601 Revision: 9 When applicable. Manways And Flanges 5. Only on vessels without cladding on convex side of the head (head external surface). Only on vessels that operates in General service. c. Nozzles provided with ASME flanges Class 400. Requirements For Design Of Nozzles. “Set-on” type nozzles may be accepted with the following restrictions. or for process reasons. Operates at temperatures over 750°F (399°C) b. The width of examined area shall be the larger of two plate thickness or two inches. such as for drains. 1 and Div. Section VIII. The attachment weld shall be inspected by PT or MT after the root and final cover pass. b.2.9.9.9. Nozzle size is smaller than NPS 2½”. The following nozzle sizes shall be avoided. 5.2.8. Pressure Vessels ASME Section VIII.9.2.9.2. this shall be noted on the vessel data sheet.2.3.2. Division 1. a.2. Conical elements complete with torical transition on the large end (knuckle type) shall be used on vessels if one of the following conditions occur.10.1(f).4. Code Case 2260 shall not be used without written approval from Suncor. c. a.10. For situations where nozzles are required to be flush with the inside vessel surface. Thickness exceeds 2” (51 mm) 5. 5. 5. 5. or ring type supports. The surface of vessel envelope surrounding nozzle location shall be ultrasonically examined and found free of cracks and laminations. 5.9.2. d.2. XH (XS) or thicker.1.13.10. The plugs shall be a mimimum of 3” (75 mm) long or ¼” (6 mm) longer than the insulation thickness. 5.12.2. Pressure Vessels ASME Section VIII. NOTE: Slip-on flanges shall be positioned so that the distance from the face of the flange to the pipe end is equal to the nominal pipe wall thickness.5. flange dimensions shall be selected in accordance with series “A”. Where LWN is not practical these nozzles shall be fabricated of pipe Sch.6. Where approved.2. c.47. Vessels where ASME Class 600 flanges or lower are suitable. b. Vessel is not cladded.5. Where required. the connections shall be fabricated using Class 3000 or higher. Flanges for nozzles NPS 26 through NPS 60 shall be provided in accordance with ASME B16. threaded plugs can be fabricated from bar stock that conform to ASME B16.10.10. integrally reinforced fittings. these include weldolets (WOL). 5.16 and supplementary requirements provided in Appendix C. e.2. Design temperature between -20°F (-29°C) and 500°F (260°C).2. Vessel service is General Service. d. Design pressure limited by Class 150. b.1. plus approximately ⅛” (3 mm).2. a.10. 5.2.10. shall be designed in accordance with ASME Code Section VIII.10. Appendix 2 or Section VIII.47. 2 5. The welds shall be applied in a manner that will not damage the flange face. Div.10. Lap joint (LJ) flanges as well as threaded flanges shall not be used on any vessel external connection that is part of pressure envelope. 1 and Div. These fittings shall be considered only under the following restrictions. The attachment weld between the o-let and vessel surface shall be full penetration type. 5. cladded or protected by weld overlay. 1 and Div.11.2. Number: 0601 Revision: 9 Typically nozzles NPS 4" and smaller shall be provided as long weld neck (LWN). Div.5 and B16. 160 pipe.2. Connections smaller than NPS 1½” may be provided subject to Owner’s Engineer approval only. c.2. Unless otherwise specified by client or process licensor. Nipples shall be made of minimum Sch. d. Div.14. 5. paragraph C.10.10.11.10. Flange shall be welded inside and out with minimum two passes per each side. Flanges with sizes exceeding the scope of ASME B16.8.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. a.2. sockolets (SOL) or threadolets (TOL). Connections NPS 1½” and larger shall be flanged.2. 5. Vessels that are not internally coated. The facing of all flanges designed for pressures up to and including equivalent of ASME Class 1500 shall be raised face (RF) type.8 5. Div. The “slip-on” (SO) type flanges can be used under the following restrictions. 5.10. paragraph 4. 5. Minimum nozzle size is NPS ¾”. Flanges for nozzles NPS 24 and smaller shall be provided in accordance with ASME B16. Rev 9. All raised face flanges shall be provided with a Standard 0601.7.9. 2 Page 20 of 66 . 10.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.10.3 µm) arithmetical average roughness height (AARH). the decision of using flat nonasbestos gaskets shall be approved by Owner’s Engineer. Minimum distance between the vessel seam and the tangent to the adjacent nozzle OD shall be no less than two vessel thickness. The vessel seam shall be fully RT examined for a length of minimum 6” (150 mm) on both sides of the interference.8 µm). the flange face shall be between 125 µin -150 µin (3. The facing of all flanges designed for pressures exceeding ASME Class 1500 shall be ring joint (RTJ) type or self energized seal type. Pad reinforced nozzles shall not be used on vessels where at least one of the following conditions is applicable.2 µm . a. Where this requirement cannot be maintained. 1 and Div. The reinforcing pads shall be provided with one ¼” NPT threaded hole (minimum of one per each segment if the repad is fabricated from multiple segments).18.20. Similar criteria shall be used in the case of interferences with nozzles complete with repads with the following supplementary requirements.10. All nozzles and manways shall be located in such a way as to avoid the interference with the other butt welds of vessel pressure envelope.2.2. All criteria presented in paragraph 5. 5. 5.10.2.10.2. Gaskets required for ASME flanges Class 900 and higher. On insulated vessels in hydrocarbon service with normal operating temperatures of 500°F (260°C) and higher.18.10. In such a case the minimum acceptable size of a nozzle is NPS 6”.10. For services with hydrogen partial pressure greater than 75 psia. 5. the acceptable interference shall meet the following criteria.15. Gaskets shall be spiral wound type with an external ring in accordance with ASME B16.18 shall be applied also to the repad. 1 and Div. Normal operating temperatures of 750°F (399°C) and higher b. as well as for all flanges larger than NPS 24” shall also be provided with an inner retention ring of the same material as the windings. 2 Page 21 of 66 .2.16. a. Pressure Vessels ASME Section VIII.2. 2 Number: 0601 Revision: 9 facing having a surface finish between 125 µin and 250 µin (3.6. Rev 9.20. For vessels with flange rating exceeding Class 300. Div.10. a.3. b.10.2 µm .2. The minimum clearance between the edges of any two welds and between the attachment weld and any longitudinal seam or circumferential seam shall be at least two vessel thicknesses.19.2. Div. the Standard 0601. Internally coated vessels shall be provided with flat non-asbestos (Grafoil preferred) type gaskets. 5. 5. Design pressures of 1000 psig (6890 kPag) and higher NOTE: In all cases presented above the nozzles and manways shall be of the integrally self-reinforced type. In the case that vessel seam will not interfere with the nozzle but only with the repad then the space between the nozzle and the vessel seam shall also meet the requirements presented in paragraph 5. b.2.21.17. 5. 5. 10.22.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. 5.23. the butt weld between the segments shall be full penetration and oriented in the vessel’s circumferential direction. 5. Nozzle projection through the top platforms shall be not less than 6” (150 mm) above the edge of toe plate attached on grating.24.26. 5.25.10. 8" (200 mm) for NPS 4" and smaller b. The manway is to be used as air supply / ventilation. 5. The manway is to be used as an emergency access during the vessel maintenance.2.28.10. Installation and removal of trays and other bolted internals is required.2.10. c.2. Nozzle ID = 2 x (V / 110) 0.27. 12” (300 mm) for NPS 14” and larger NOTE: In the case of insulated vessels the nozzle projections presented above shall be from insulation surface to the flange face. Where segmented reinforcing pads are used. On horizontal vessels.5 where V is vessel volume in ft³ Standard 0601.10. Pressure Vessels ASME Section VIII.2. Access manways shall be provided on all vessels with diameter exceeding 36”.10. The typical nozzle external projection measured from the outside vessel surface to the flange face shall be a minimum of. the nozzle ID shall be considered at the internal surface of weld overlay. the top manways can also be used as ventilation.2.2. 5. b.29.2. as specified. All vessels provided with side manways shall also be provided with a minimum NPS 2” ventilation nozzle located at or near the highest point. 5. Manways NPS 24” and larger are required where. Access manways shall have a minimum 23" (585 mm) I.2. a. Div. The required ventilation nozzle may be used for other purposes as well. 2 Number: 0601 Revision: 9 holes shall be fitted with a ¼” NPT nipple ending a minimum of ½” (12 mm) beyond the outside surface of the insulation cladding. The minimum size of ventilation nozzles shall be selected as follows.D. Vessels with a smaller diameter shall be provided with handholes or bolted heads or flat covers. For example. 10" (250 mm) for NPS 6" to NPS 12” c. 5. 1 and Div.10. the ventilation nozzle and the access manway shall be located close to the opposite ends of the vessel. 5. Div. where applicable. Rev 9. All connections required for thermowells shall be flanged and having an internal diameter (ID) not smaller than 1¾” (45 mm). In the case of cladded vessels.10. All manways shall be provided with hinged covers or covers supported by davits. 2 Page 22 of 66 . 1 and Div. a. One at the feed zone e. 1 and Div. Towers equipped with trays or packing shall be provided with manways as follows. 2 Number: 0601 Revision: 9 5.2.2.10. 5. The minimum size of rectangular access (minimum hole size) shall not be smaller than 18” (460 mm) x 16” (410 mm) if the access is oriented horizontally (such as trays) and not smaller than 20” (510 mm) x 20” (510 mm) if the access is oriented vertically (such as vertical baffles).10. Nozzle corrosion allowance shall be at least equal with vessel corrosion allowance. 5. Div.36.10. One manway located in the tower bottom section below the lowest tray or below the lowest packing bed. Manways shall be oriented in such a way as to ensure self-draining back into the vessel (manway centerline shall not be inclined below horizontal in this case).10.32.2. 5. Standard 0601. If the depth of internal free space below any manway exceeds 36” (900 mm). an appropriate number of internal ladder rungs welded on vessel internal surface shall also be provided. One between each packing section. the manway may be provided with two grab rungs located at 45° on each side of manway (such as 10 and 2 o’clock) and welded on vessel internal surface. 5.35. Rev 9.30. there shall be not any removable connections (such as flanged or threaded connections) inside of vessel skirt due to the potential fire hazard created by leaks. One above each chimney tray f. 5.2. On vertical vessels without internals. Horizontal vessels longer than 75 ft (23 m) shall also be provided with the second manway (egress access). Within continuous train of trays. NOTE: Owner’s Engineer shall provide the fabricator of internals with the information referring the internal diameter of manways. one manway per each set of 10 (ten) trays g. b. a.2.2.37.38.10. 5. One above the top tray or above the top packing bed c.31. On vertical vessels provided with skirt support. An acceptable alternative is to provide additional manways in the vessel wall.34. All internal separation plates (baffles) and trays shall be provided with bolted manways to permit access to all internal surfaces of the vessel envelope. Where there is not practical because the space limitation.10. Div. One at each liquid distributor d. 5.2. 2 Page 23 of 66 .MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.2. 1 and Div. Pressure Vessels ASME Section VIII.10.33.2. All access manways shall be provided with a grab rung (minimum 1” diameter) located above the manway and welded on vessel internal surface.10. 5. the access manways shall be located near the base of the shell.10. MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. Bolt allowable stress shall be considered 18. W = Tower operating weight [lb] D = Tower diameter [ft] F = Maximum force induced by wind or earthquake [lb] H = Tower height including the skirt support [ft] For further guidance on pretensioning requirements for anchor bolts.5 x W x D < 0.4 5. Div. On vessels on which the transition between skirt support and head requires UT examination. refer to reference 3. Requirements For Design Of Supports And External Attachments 5. 2 Page 24 of 66 . c.3. The calculated bolt diameter of anchor bolts shall be increased by ⅛” (3 mm) for corrosion allowance.11.2.11. The design of skirt support base plate shall be provided in accordance with the following requirements. b. The thickness of skirt support shall not be less than ¼” (6 mm).2. 0.2.11. The maximum size of anchor bolts shall be 2½” (64 mm). 5. Standard 0601. a.000 psi for ASTM A325.2. Rev 9. 2 Number: 0601 Revision: 9 5. and 25.000 psi for ASTM A193 B7.11.11. 5.000 psi for ASTM A307B. 5. 22. b.5 x F x H where. Div. Minimum anchor bolt size shall be 1” (25 mm).2. a.5.2. The lap joint technique used to attach skirt supports shall be avoided. On vessels with head thickness exceeding 2” (50 mm).11. d.7.2.2. 1 and Div. the anchor bolts shall be pretensioned at approximately 10% of bolt allowable stress. 1 and Div. On vessels exposed to fatigue as a consequence of pressure and thermal cycles.1. The surface of transition weld between the support and bottom head shall be provided with a minimum 3 to 1 transition in order to minimize the stress concentration. To safeguard against fatigue in anchor bolts. The attachment between the bottom head and skirt support shall be provided as a weld build-up or as a forged ring in any of the following cases. Minimum space between two anchor bolts shall not be less than 6 (six) bolt diameters. This shall be applicable in situations where the following condition applies. Pressure Vessels ASME Section VIII. The size of anchor bolt-holes shall exceed the size of the bolts by ½” (12 mm). e.4. c. The skirt support shall be attached to the bottom head by full penetration welding. 11.2. minimum 36” (915 mm) clearance between the top of access opening and tangent line of bottom head. Pressure Vessels ASME Section VIII. c. All skirt support openings required for nozzle passage shall be provided with a pipe sleeve with a length not smaller than 4” (100 mm).11. All skirt support openings required for access. Rev 9. 5.2.11. The height of skirt support shall be designed to allow.11. 2 5. Nozzle OD + 2 x Height of guiding gussets + ¼” (6 mm) gap 5.7. The height of the hot box shall be the maximum between below. Vessel operating temperature is higher than 600°F (316°C). 2 Page 25 of 66 . 5. d. Number: 0601 Revision: 9 The top 2 ft (600 mm) portion of skirt supports attached on vessels operating at temperatures exceeding 750°F (399°C) or lower than -20°F (-29°C).2. Div. 5. a. shall be fabricated from the same material type (same P number) as the base material of vessel bottom head.2. 5. Div.11. 1 and Div. When the skirt is fabricated from two different materials.11. b.9. Table 2 Height of Hot Box 6” (150 mm) 8” (200 mm) 10” (250 mm) 12” (300 mm) Vessel Internal Diameter Up to 72” (1830 mm) Over 72” (1830 mm) to 120” (3050 mm) Over 120” (3050 mm) to 168” (4270 mm) Over 168” (4270 mm) R x t and those in Table 2 where ‘R’ = vessel radius [in] and ‘t’ = head thickness [in] Standard 0601. Minimum 36” (915 mm) clearance below the bottom head to base plate. Minimum 6” (150 mm) clearance between the bottom of access opening and the top of the anchor bolts. c.2. Nozzle OD + 2 x Insulation thickness + 1” (25 mm) gap b. Support skirts for vessels shall be provided with a hot box if at least one of the following requirements are met.10.6. Normal operating temperature varies in cycles over a range of minimum 400°F (222°C).8. Minimum 12” (300 mm) clearance between the top of access opening and tangent line of bottom head. a. a.11. b. 1 and Div. nozzles and ventilation shall be provided with adequate reinforcements (sleeves) to compensate for the size of the openings. The pipe sleeve ID shall accommodate. Vessel design temperature is 700°F (371°C) and higher.2.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. 2.2. a.11. ladders and platforms shall be seal welded all around except at the lowest point.2.10. c. 2 Page 26 of 66 . Div.11. 5. 5. Vessels H/D ratio is 3 or smaller. a. Div. equally spaced. b. On heavy wall vessels the entire ring supports (or part of them) may be integrally forged with cylindrical shells. piping loads. Vessel diameter is 8 ft (2.2. The reinforcing pads shall be provided with rounded corners with a radius of minimum 1” (25 mm) or larger. Standard 0601.11. Skirts supported by elevated beam structures or rings (that allows free air circulation beneath the skirt) do not need ventilation holes. ventilation holes shall not be used. Reinforcing pads shall not be used in the following cases. wind or seismic loads.11. The weld leg shall be designed to withstand the operating loads as well as the dynamic cyclic loads during the vessel transportation to erection point. 1 and Div.19. After welding. located near the top of the skirt.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. 1 and Div. External reinforcing pads designated to support clips for pipe supports. For vessels where the operating temperature is at or above the process fluid auto ignition temperature in air.16. The fabrication method used shall be reviewed and approved by the Owner’s Engineer before award of the contract. Rings fabricated by weld build up and machined to the final dimensions.11.44 m) or smaller. 2 Number: 0601 Revision: 9 5. All skirt supports shall have at least four (4) NPS 2” ventilation holes. a. 5. Pressure Vessels ASME Section VIII. Internal rings supporting the catalyst beds shall be fabricated in accordance with one of the following alternatives. shall be seal welded all around and provided with a ¼” NPT diameter vent hole at the lowest point. d.2.18.2. 5.2.11.11. Vessel supports as well as the surrounding portion of vessel pressure envelope attached to the supports shall be designed to withstand the combined effect of fully dressed vessel weight. Rev 9.2.11. Forged rings welded with full penetration weld to vessel base metal.20.2. the transition between the base metal of the rings and shell shall be ground smooth with a minimum radius of ¼” (6 mm).15. This is to mitigate the risk of fire damage in the event of a process leak occurring within the skirt.13.14.11.11. The material used for weld build-up shall be similar to that used for the base metal of vessel pressure envelope. 5. c. Where saddle wear plates are required to reduce the stress in the horizontal vessels envelope. 5. On all vessel surfaces with normal operating temperatures of 750°F (399°C) and higher. 5. Leg or lug type supports may be used if all following restrictions are met. b.2.17. 5. Hot box is not required per paragraph 5.12. The size of skirt access openings shall not be smaller than 23" (510 mm) ID. 5. Any cladding and/or weld overlay shall be considered the equivalent of corrosion allowance. Materials used in fabrication of vessel pressure envelope shall be selected from the list presented in Appendix A. If not otherwise specified.1. coker fractionators) the skirt support internal surface shall also be fireproofed. 1 b.1. standard drawing GD00A-N-0007/0001 shall be used as reference for the skirt supports requiring fireproofing. Where installation of bolted covers is impractical or for the critical vertical vessels operating at temperatures in excess of 600°F (316°C) (such as reactors. vacuum towers. Corrosion allowance shall be determined in accordance with ASME Section VIII.21.3. Different materials will require Owner review and special approval before award of the contract or PO. Nonferrous and high alloy steels /32” (0.2.3.4.2. 1 and Div. Div. The corrosion allowance shall be added to all pressure containing parts exposed to process as well as on all surfaces of non-removable internals. 5. 5. Materials 5. Where fire protection is required the external surface of vessel supports shall be provided with fire proofing clips in accordance with the requirements presented in Suncor standards 0060 and 1003. a. Pressure Vessels ASME Section VIII.2. Solid high alloy steels used for fabrication of the pressure boundary. Corrosion Allowance 5.1. P6 and P7 shall be avoided in the fabrication of pressure vessel envelope. P5B.12. 1 and Div.11.12.1.12. Rev 9.2. Standard 0601.3. Consequently cladding and weld overlay shall not be considered as part of calculated minimum vessel thickness. 5. 1.2.3. the minimum corrosion allowances shall be as follows. 5.3.1.2. Div. The use of ASME materials categories P3.22. Div. General Cast steels shall not be used in the fabrication of pressure vessels. 5. shall be selected based on the following restrictions.2.12.2.1. Unless otherwise specified. Internal coatings may not be used where temperatures exceed 200°F (93 °C) in normal operation (or expected upset conditions such as steam-out) without Owner’s Engineer approval. In addition all access openings shall be provided with bolted covers. Carbon and low alloy steels ⅛” (3 mm). 2 Page 27 of 66 .3. 5.3.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. Ferritic type stainless steels (such as type 400 series) shall not be used. coke drums. 2 Number: 0601 Revision: 9 5. NOTE: Corrosion allowance applied on all surfaces of removable internals shall be considered half of the corrosion allowance for pressure envelope.11. paragraph UG-25.8 mm).1. 5. 5. a.3. Subject to Owner’s Engineer approval.3. 2 Page 28 of 66 .2. 5. 5. For these applications. °F (°C) 1000 (538) 850 (454) 850 (454) 900 (482) ASME P no.1 and Div. the fabricator shall provide supplementary material coupons installed inside of the vessel envelope that will be used to monitor the degree of graphitization.7. The design shall also require a temperature monitoring program to ensure excursion time up to 825 °F does not result in graphitization levels that would impact vessel life. 2 Number: 0601 Revision: 9 b. Table 3 Design Temp. design of carbon steel pressure vessels. if design pressure is limited up to 100 psig (680 kPag) and vessel wall thickness does not exceed 2” (50 mm). °F (°C) 900 (482) 800 (427) 800 (427) 850 (454) Design Limitations Div.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.1 only Div. 3 Cr-1 Mo and 3 Cr-1 Mo-¼ V) shall meet the specific requirements presented in Appendix C. Div. 1 and Div. Div. a. Austenitic type stainless steels (such as type 300 series) shall have low carbon content (0.1.6.1.3. All low alloy ASME P5A and P5C materials (2¼ Cr-1 Mo. This is to ensure the maximum degree of graphitization does not exceed 10% after 30 years of continuous operation.3. All carbon steel components used in fabrication of pressure envelope shall be fully killed.1. In accordance with reference in paragraph 3. b. the limitation shall be in accordance with ASME Section II.1 and Div. Division 1. 2¼ Cr-1 Mo-¼ V.8.5. Maximum graphitization degree of the steel structure shall not exceed 5% after 30 years of continuous operation. 1 and Div. Normal operating temperature shall be limited to not more than 750°F (399°C). temperature excursions up to 825°F (440°C) can be accepted only on vessels with MAWP not exceeding 100 psig (689 kPag) and with a wall thickness not exceeding 2” (50 mm).9. and only for vessels designed in accordance with ASME Code Section VIII.000 hours through the vessel lifetime. shall be restricted as follows.2 Div. P4 P4 P5A P5C Operating Temp. 5.3. The limits in Table 3 below shall be considered for selection of materials used for pressure envelope. Subject to Owner’s Engineer approval.2. Div.2 For materials not listed.3. In no case shall the total accumulated excursion time exceed 25. Rev 9. Standard 0601.1.2 only Div. 5. All low alloy ASME P4 materials (1 Cr-½ Mo and 1¼ Cr-½ Mo) shall meet the specific requirements presented in Appendix B. 5.03%) and/or stabilized in order to avoid sensitization of weld metal and heat affected zone.7.1. Pressure Vessels ASME Section VIII. and only for vessels designed in accordance with ASME Code Section VIII. maximum operating temperature can be increased to 800°F (427°C). for vessels designed to operate at pressures over 100 psig (689 kPag) and/or with a wall thickness of 2” (50 mm) and over. c.1. Plates All carbon steel plates used for fabrication of pressure envelope shall be normalized. or Gr. 5.2.1.60 or Gr.1.3.3. 2 Page 29 of 66 .1. 5. SA516 Gr.1. 2 5. The grain size shall be ASTM #5 or finer.3. 5. In such a case the required mechanical properties shall be clearly specified in vessel data sheet.3.70.3. a.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. Vessel supports.2.9.3. Bolts And Nuts Bolts and nuts used as parts of pressure envelope and their temperature limitations shall be as per Table 4 below. ° 5.3. Material toughness shall be provided in MTR or shall be confirmed by additional Charpy “V” impact tests (minimum 3 tests per heat). 5.8 to 4. 5. Materials required for pressure envelope of vessels subjected to PWHT shall meet the required mechanical properties after being exposed to two PWHT cycles.3. The results shall be reported on the mill test certificate.2. Div.13. Number: 0601 Revision: 9 Carbon Steel materials used for vessel supports and exposed to temperatures between -20°F (-29°C) and 500°F (260°C) may be fabricated from SA283 Gr. Rev 9.C. 1 and Div. Presence of Widmanstatten structure is not acceptable.12.15. Minimum absorbed energy shall be not lower than 15 ft-lb (20 J). 1 and Div. Pressure Vessels ASME Section VIII. For vessels operating at temperatures below 750°F (399°C). lifting lug materials shall be based on the required single use or permanent design. shall be fabricated of materials and use weld procedures suitable for the lowest ambient temperature. Plates ½” (12 mm) thick and thinner may be accepted as rolled (not normalized) in services other than the ones presented in paragraphs 4.3. Special heat treatments required to improve mechanical properties (such quench-tempering or normalizing and tempering) shall be clearly specified in vessel data sheet. Div. 5. Standard 0601.1.1. 5. External welded attachments required for vessels operating at temperatures over 750°F (400°C).14.3.3. On all plates designed to operate in low temperature service [below -20 F (-29°C)] or made of materials with improved toughness properties.11. Formed ferritic plates (such as heads) made of carbon steel or low alloy steel shall be supplied with the following supplementary requirements.2. exposed at temperatures lower than -20°F(-29°C).1.1.D.10.3.3. shall be fabricated from similar materials (same P number) as that used for the vessel pressure envelope. All welding procedures used for external attachment welds to the vessel shall be qualified to the vessel MDMT. 5. the grain size shall be determined in accordance with ASTM E-112. 5. 2] 800 (427) 1200 (649) [Div.4. Vessels subjected to PWHT shall have all the internal and external non-removable attachments welded prior to the stress relieve heat treatment. In cases of closing seams or in the cases where the access for welding is limited to one side.6.6. construction or transportation constraints some external attachments cannot be welded prior to PWHT. Pressure Vessels ASME Section VIII.6. 5. Max. 5.4. The weld shall not intersect any other pressure retaining welds. 5. 1 and Div. Temp. 5.3. the root pass shall be welded using a WPS that will assures the required mechanical (particularly toughness) properties.6.4.4.4. Rev 9.5. The attachment weld is provided on vessel external surface.4. Where due to design. 5.4.3. Welding shall comply with Suncor Standard 0903 requirements.4.2] 650 (343) Internal. The total thickness of weld deposit shall not exceed ⅜” (9 mm) and shall be provided in multiple passes.3. °F (°C) Div. 5.4.2 Table 3.3.1.1] 800 (427) [Div. 5.6. Page 30 of 66 5.4.1 UCS 66 or Div. 5. The buttering layer option shall be a minimum of ⅜” (9 mm) thick completed with at least two passes. non-pressure retaining bolting shall be of the same material as the vessel internals (solid.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.4. 5. The preferred type of weld geometry shall be completed from both sides (weld with backing).6.4 -20 (-29°C) -55 (-48) -325 (-198) -150 (-101) Number: 0601 Revision: 9 Material SA 193-B7 / SA 194-2H SA 193-B16 / SA 194-4 SA 193-B7M / SA 194-2HM SA 193-B8M / SA 194-8M SA 320-L7M / SA 194-4 5.1.2.5. Total length of fillet weld shall not exceed 16” (400 mm). 5.4. Temp. 2 Table 4 Min. The weld will not be used as pressure retaining component.2. Small attachment welds can be provided after final PWHT under the following restrictions. 2 . 1 and Div.6. Vessel pressure envelope is made of carbon steel.4. using registered welding procedures (WPS) supported by proper procedure qualification records (PQR). °F (°C) 800 (427) 1000 (538) [Div.1] 800 (427) [Div. 5.6. Standard 0601.2.4. Div. a buttering layer of weld or fillet welded pad shall be attached on the vessel surface (in the location where the attachment will be welded) prior to the heat treatment. Fabrication 5. All pressure retaining welds (part of vessel pressure envelope) shall be full penetration. Div.4. cladding or weld overlay). all welds shall be ground smooth to eliminate sharp corners and edges.8. 5. the preheat temperature shall be maintained at 250°F (121°C) or higher. 5. 5. For all vertical vessels provided with skirt supports and minimum 8 anchor bolts.2.12.9.8. 5. shall be welded with full penetration on the pressure envelope (complete fusion) for the full length of the weld and shall be free from defects including undercut. Minimum PWHT temperature of carbon steel materials (P1) containing traces of vanadium exceeding 0. 5. The Standard 0601. Minimum thickness of pressure envelope measured at the location of attachment weld is ¾” (19 mm).0. During the welding process. All attachment welds subjected to external loads that may induce a stress in pressure envelope exceeding 30% of allowable limit. 5. 5. PWHT temperature = 1100 + 3260 x (V% . 2 5.1 materials (2¼ Cr-1 Mo) 5.004) where.4. overlap.15. 5. 5. “STRESS RELIEVED – DO NOT WELD”. V% = Vanadium content [%] NOTE: Alternate PWHT procedures at lower temperatures for extended period of time shall not be used. INT 5. All skirt support butt welds shall be full penetration type. All machined faces. A gradual transition from weld surface to the base metal is required to eliminate stress concentration points. 5. The WPS and PQR shall be qualified to provide an as welded deposit with hardness not exceeding 200 HB. 2 Page 31 of 66 .4. Number: 0601 Revision: 9 The local thickness of pressure envelope shall not exceed 1¼” (32 mm).13.6.4. The same note shall also be marked on the insulation jacketing at two locations 180° apart by either stencil or weatherproof label.7. 1250°F (677°C) for ASME P4 materials (1 Cr-½ Mo and 1¼ Cr-½ Mo) 1275°F (691°C) for ASME P5A and P5B Gr.4.3.4. 1 and Div.8. Pressure Vessels ASME Section VIII.4. an anchor bolt template shall be fabricated and supplied for construction of foundation. 1 and Div. 5.7.11. flange faces and threaded connections shall be protected against oxidation due to PWHT. PWHT equipment shall have the following stencilled on two locations 180° apart in clearly visible letters.4. The PWHT temperature shall not be lower than.4. Rev 9.10.6. 5.1. Div.8. Div. 5.10.8.9.4.004% shall be determined as follows.6. On vessels operating at temperatures exceeding 800°F (427°C). 1125°F (607°C) for ASME P1 materials (Carbon Steel).6.4.4.4.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. Vessel circumferential welds shall be located to facilitate visual inspection with all internals installed in place.14.4. The bolt holes in the template shall be perforated simultaneously with the ones provided in the support base plate.4. or abrupt ridges or valleys.4.4. 5. a. 5. if designed to operate in Sour Service.16. 5. 5.1. Rev 9. After surface conditioning the area shall be MT or PT examined.5. Vessels not subjected to PWHT. Div. Div.3. d. Vessels are not subjected to sustained vibrations (other than induced by wind or earthquake). The plate material is carbon steel P1.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. Total height of the template shall not be smaller than the height of anchor bolt chairs or the distance between top of compression ring and bottom of support base plate. The total extent of defect before repair is within the limits defined in ASME SA-20. 1 and Div. c. Vessels that will operate in General Service or.1. RT examination shall be provided on the butt welds for.4.5.5.5. Except otherwise specified. Div. Div. will have internal surfaces protected by cladding or weld overlay. The defect may be repaired with the following restrictions. then all adjacent surfaces shall be UT examined in order to determine the extent of the defect.5.17. Vessels that meet ALL the following requirements shall be “SPOT” examined and stamped “RT-3”. Pressure Vessels ASME Section VIII. 2 Number: 0601 Revision: 9 template shall be provided either with anchor bolts guiding sleeves or shall be double plate type.2. All arc strikes and/or temporary attachment welds present on fabricated pressure envelope shall be removed. Supplementary specific requirements for vessels fabricated of P4 and P5 steels are provided in Appendix B and Appendix C. 5.5. Vessels that meet ALL the following requirements shall be “FULL” examined in accordance with the definition provided in ASME Code Section VIII. The internal surface on vessels provided with internals organized as removable cartridge shall be checked with a template to ensure that the assemblies can be inserted and withdrawn without interference or binding. 2 .1 b. e.5. 5. Vessels have a maximum wall thickness of 1¼” (32 mm).2.1. Page 32 of 66 Standard 0601. The diameter of the template shall be no smaller than the specified ID of the vessel minus 1/16” (2 mm). 5.5.3. Inspection And Testing 5.2. 1 and Div. 5. 5.2.4. Any defects found shall be repaired and re-examined. f. all carbon steel plates thicker than ½” (12 mm). Vessels designed in accordance with ASME Code Section VIII.3. The base metal surface shall be properly conditioned by grinding in order to eliminate the defects and surface stress risers.18.1 paragraph UG-116 (e)(2) and UW-11(a)(5) and stamped “RT-2”.2. shall have the bevelled edges MT or PT examined. 5. A jig set shall be used to fix the flange alignment and the distance between the instrument connections required for level gauges or for level controllers with bridles.4. Vessels are not subjected to cyclic service. If open laminations are present. Div. Div.5. NOTE: Due to restrictions imposed by fabrication schedule.1. Div.1. Vessels subjected to PWHT.5. Div. MT examination in accordance with ASME Code Section VIII.1. Vessels designed in accordance with all requirements presented in paragraph 5. 5. a.5.3.6 shall be applied on the following welds on materials with ferritic structure. b.3. Appendix 12 or ASME Code Section VIII. Vessels on which for economic reasons the weld efficiency “E” needs to be considered equal to 1. 5. c. Vessels subjected to sustained vibrations (other than induced by wind or earthquake). Butt welds of vessel pressure envelope that meet ANY of the following requirements. Vessels subjected to PWHT. Appendix 6 or ASME Code Section VIII. Internal and external surfaces of pressure envelope welds on vessels that meet ANY of the following requirements. All welds between “Set-on” nozzles and vessel pressure envelope. Div.3. Pressure Vessels ASME Section VIII.2.5. All vessels designed in accordance with ASME Code Section VIII. INT 5. 5.3. b. 1 and Div.4. Vessels designed in accordance with ASME Code Section VIII.4.5.2. to be used as an alternate to RT examination required after PWHT. b. Standard 0601. Manual UT examination in accordance with ASME Code Section VIII. d. d.0. a. Div.4. On vessels subjected to PWHT. Corner welds (“D” category) of pressure envelope on vessels that meet ANY of the following requirements. Vessels subjected to cyclic service.5. the RT examination may be partially or totally replaced with automated UT in accordance with ASME Code Case 2235 and standard PQA-GS-0019. 2 Number: 0601 Revision: 9 a. Vessels subjected to cyclic service. All weld build-ups applied inside or outside of vessel pressure envelope. b. Vessels that meet ANY of the following requirements shall be “FULL” examined in accordance with the definition provided in ASME Code Section VIII. paragraph 7. c.5.1.2. Vessels subjected to sustained vibrations (other than induced by wind or earthquake).5.5. Div.1.2.5. a. 5.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.4. availability or due to limitations of equipment used for RT examination and/or for economic reasons.4. Rev 9. 5.5.2.4 shall be applied on the following welds.1 paragraphs UG116 (e)(1) and UW-11(a)(2) to UW-11(a)(4) and stamped “RT-1”. On closing seams and other butt welds with access restricted from one side. INT 5. 2 Page 33 of 66 .4. 5.5.5. Div. paragraph 7. Div. 1 and Div. INT 5. 1 and Div.2. On all internal attachment welds subjected to light loads (stress induced in vessel envelope is lower than 20% of allowable limit) on vessels designed to operate in General service. 1 and Div.5.5. Attached on vessels designed in accordance with ASME Code Section VIII. On all external attachment welds subjected to light loads (stress induced in vessel envelope is lower than 20% of allowable limit).5. Vessels subjected to PWHT.5. 5. c. All cases presented in paragraphs 5. Attached on vessels subjected to sustained vibrations (other than induced by wind or earthquake). Rev 9.2.5.1.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. The surface of external attachment welds that meet ANY of the following requirements. Number: 0601 Revision: 9 b.5. The surface of the weld between skirt support and base plate as well as between the skirt support and compression ring. Vessels subjected to cyclic service. Div. 2 Page 34 of 66 . Div. 5. Subjected to high loads (stress induced in vessel envelope exceed 20% of allowable limit). a. e. b. PT examination in accordance with ASME Code Sec.5.7.1 to 5. Div. e.6. Attached on vessels subjected to cyclic service. Div.5.2.5. 5.VIII.5. c. 2 a. b. Standard 0601. 5.6.5.1. Attached on vessels subjected to PWHT.5.5. 5. Subjected to high loads (stress induced in vessel envelope exceed 20% of allowable limit.2. a. Attached on vessels subjected to sustained vibrations (other than induced by wind or earthquake). 5.3. d. Attached on vessels subjected to PWHT.4 when vessel pressure envelope is fabricated from austenitic stainless steels (steels without ferromagnetic properties) or on the internal surfaces protected by austenitic stainless steel used as cladding and/or weld overlay. Pressure Vessels ASME Section VIII. d. The surface of internal attachment welds that meet ANY of the following requirements. Appendix 8 or Section VIII Div.7 can be used in lieu of MT examination in the following situations.5.6. Attachment welds between vessel pressure envelope and pipe supports 5. c.5.3.4. Attached on vessels subjected to cyclic service.5. paragraph 7.6. MP or PT examination shall be carried out on all formed surfaces (knuckles and flares) such as formed heads and conical transitions designed to operate at temperatures below –20°F (-29°C). Vessels subjected to sustained vibrations (other than induced by wind or earthquake). 2.11.1. buckling or denting of pressure envelope. 2 Page 35 of 66 .11. 5.Minimum one reading per weld.5.VIII. Any required internal coating and/or external priming/painting shall be applied after the hydrotest. the extent of PT examination shall cover.5. For vertical vessels the test pressure shall also have included the equivalent static head of flooded vessel on operating position.2. 5.5. Standard 0601. 5.5.5.5. All weld overlay restoration (applied over the pressure retaining welds) Minimum 50% of weld overlay applied over internal surface of nozzles.2.7. All welds between the segments shall be MT or PT examined in accordance with ASME Code. 1 and Div.11. 5.10. paragraph 7.1.5.5. Brinell hardness on external or internal surfaces of pressure retaining welds subjected to PWHT . 2 Number: 0601 Revision: 9 5.1. Div.2.5.1 or Div. 5.2. Minimum 10% of weld overlay applied over internal surface of shells and heads.8.3. The shop hydrotest of new vessels shall be performed in accordance with the following requirements.8.5. Vertical vessels shall be properly supported to prevent any plastic deformation. All welds between the segments shall be 100% radiographed in accordance with ASME Code. 5. Div.5. 5. 5. Rev 9. 1 and Div.1. Section VIII. 5. the examination shall be performed after machining.2.8.1.3. For vessels clad with (or fabricated from) austenitic stainless steel the chloride content in the water used for hydrotest shall be lower than 50 ppm. Div.11. NDT +60°F (+24°C).1 or Div. The test temperature shall not be lower than the greater of the two following calculated values. If heat treatment is required. The test pressure shall be calculated based on vessel MAWP (corroded).11. 5.9. 5.10. where NDT is determined in accordance with ASTM E208.5. Weld overlay shall be PT examined in accordance with ASME Code Sec. or when due to the forming process the extreme fiber is elongated more than 5% and welding is performed prior to forming.9.5. MDMT +30°F (+17°C) b.11. a.4. 5. Pressure Vessels ASME Section VIII.5. 5. 5. Appendix 8 or Section VIII Div. Section VIII. Hardness examination shall be performed on weld deposits and adjacent heat affected zones (HAZ) as follows.9. After forming process.5.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.5. Div. Unless otherwise specified by client or process licensor. Div. Where weld overlay surface will be machined.9.5. the examination shall be provided after heat treatment. the following supplementary NDE shall be performed on all formed heads fabricated from welded segments that will operate in services at temperatures below –20°F (-29°C). The following vessel weights. Pressure Vessels ASME Section VIII. The test and rinsing procedure shall be subject to review and approval by the Owner’s Engineer. diameter and thickness of reinforcement pad.1.5. 1 and Div. FTP. a.3 for details.5.6. 5. Rev 9. Div.5. 2 Number: 0601 Revision: 9 5. 2 Page 36 of 66 .2.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. stiffening rings. davits.12. MDMT + 50°F (MDMT + 28°C) b. 5.6. Any new required internal coating and/or external priming/painting shall be applied after the hydrotest. The test temperature shall not be lower than the greater of the two following calculated values. Location and details for all appurtenances such as platform clips. If water with chloride content less than 50 ppm is not available.5. Thickness of pressure containing components (base metal and cladding thickness shall be shown separately). Operating Weight. Fabricated weight. See paragraph 5.3. The field hydrotest of new or existing vessels shall be performed in accordance with the following requirements. projection. Copies of the Vendor's certified shop drawing showing dimensional changes. Support mounting dimensions and location.12. and attachment weld sizes. Overall vessel dimensions. fireproofing supports. a.1. where FTP is determined in accordance with ASTM E208. Nozzle size.1.12. pipe support clips. 5. c.6.4. 5. The top test pressure shall be calculated based on vessel MAWP (corroded). if any. d. All applicable Codes and Standards. Fabrication drawings shall include the following information. g. Div.5. The Supplier shall furnish the following documents for each fabricated equipment. Documentation and Approval Requirements 5. 5. facing. Detailed drawings showing the "as built" dimensions of the completed vessel. location. Nameplate with data included.5.1.12. b. 5. etc f. For vessels clad with or fabricated with austenitic stainless steel. 5. Standard 0601. rating. e. h.12. Manufacturer's Data Report (Code form).2. the chloride content in the water used for the hydrotest shall be lower than 50 ppm.6.1.12.2.5. insulation support rings. 1 and Div. 5. then water containing more than 50 ppm chloride but no more than 250 ppm may be used only if the duration of the test procedure is 72 hours or less and includes rinsing the vessel with water containing less than 50 ppm chloride immediately upon completion of the hydrotest. Empty weight. Hydrogen.1.13 Stamping or indentation marking shall not be allowed on a vessel internal surface for clad equipment. 5.3. 2 5. Number: 0601 Revision: 9 Material test reports on all components requiring documentation by the Code.2. weld identification.2. 5. Copy or rubbing of the nameplate.6. Special Service Requirements 5. a. including certificates for bolting materials. (The cycle of heating.2.8 thru 4. Amine.2.10. Connections smaller than NPS 1½” shall not be used.1.1.1.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.3. 5.1. 5.2.7. 5. and cooling shall be shown).8. Div.7. 5.6. soaking.7. Material and Fabrication Requirements for Equipment in Sour Service or Hydrofluoric (HF) Acid Service Base materials shall conform with requirements of NACE MR0103 or MR0175/ISO 15156 as applicable.7.6. Hydrofluoric Acid or Cyclic service as described in paragraphs 4. Standard 0601.1. no welding. and full report of all results.5. 5. Heat treatment records shall include a copy of the temperature recording chart obtained during postweld heat treatment as well as hardness testing results. The designer is cautioned to ensure the appropriate requirements for each applicable service environment are addressed and that more than one service requirement may be applicable.1.6. and ultrasonic test results shall also be included when applicable. Test reports provided on weld deposits and HAZ (where applicable) Copy of the hydrostatic test pressure chart.7.6.1.1.7. All internal attachment welds shall be full penetration type. 2 Page 37 of 66 . hammering or cutting shall be performed after PWHT. 5. 5.4.7. 5.2.6. Vacuum degassed and normalized. 5. Rev 9. This section provides additional requirements for vessels designed to operate in special services. 5.6. Material and Fabrication Requirements for Equipment in Sour. 5.9.7. Any grinding performed after PWHT shall ensure metal temperatures are kept below 500°F (260°C). 5.1. For new construction. including map of all weld seams.1. including Code stamping. 5. 5.6. extent of examination performed. Div. Carbon Steel plates shall have the following requirements. Heat treatment records. It is the sole responsibility of the fabricator to apply and obtain all necessary approvals and registration from the local Regulatory Authorities. impact test results.6.7.3. 5.7. Caustic. Pressure Vessels ASME Section VIII. 1 and Div.3.2.2. 1 and Div. All design calculations.4.3. Records of all weld NDE. Vacuum or external pressure rating of vessel.7.6. All welds between the segments shall be 100% RT examined in accordance with ASME Code.012% iii. b. a. P. V + Cb ≤ 0. Div. 2 b. For carbon steels. Section VIII. Any defect which does not meet the requirements presented in ASME Code Section VIII Div.02% Chemical analysis reported on Certified Material Test Reports shall include Cb.E.1 or Div.1 or Div.45 for thicknesses 1 inch and greater where. S.5.8. Ti. in accordance with ASME SA 578 Scanning S1.015% iv.003% ii. 1 and Div. acceptability Level C. V. V ≤ 0. 5.47 shall be.E.3. Material chemistry shall be restricted as follows. Deliberate additions of Boron or Titanium are not permitted.1 Appendix 12 or Section VIII Div. If the hot forming temperature is equal to or greater than the normalizing temperature then additional normalizing heat treatment after completion of forming will not be required. C.7. Rev 9. 1 and Div. All cold formed heads of carbon or low alloy steels shall be stress relieved or normalized after forming. 100% UT examined (after machining) in accordance with ASME SA 388 and ASME Code Section V Article 5.7. Cb ≤ 0. In the case that normalizing is provided then the mechanical properties of material shall be reconfirmed.2. Vacuum degassed and normalized or quenched and tempered.3.7. Standard 0601. P ≤ 0.3.015% v. 2 Page 38 of 66 . Cr. b. shall be rejected. 5.3. = C + Mn/6 + (Ni + Cu)/15 + (Cr + Mo + V)/5 where all values are in weight percent.2 paragraph 3.) for plate materials shall be 0. the maximum permissible Carbon Equivalent (C. Repair of defects requires Owner’s Engineer approval.7. Div. Pressure Vessels ASME Section VIII. Cu 5. Number: 0601 Revision: 9 INT i. All welds between the segments shall be MT or PT examined in accordance with ASME Code.3.2.4.5 or B16. Mo. S ≤ 0.7.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. Plates shall be 100% UT examined.6. Section VIII. MP or PT examination shall be carried out on all formed surfaces (knuckles and flares) such as formed heads and conical transitions. a.43 for materials less than 1” thick and 0. Div. 5. After forming process. 5.7.3.3. Carbon steel forgings except the standard components such as flanges fabricated in accordance with ASME B16. 5.7. the following supplementary NDE shall be performed on all formed heads fabricated from welded segments.3.4. Div. Ni. B7M (bolts) and ASME SA 194.VIII. Appendix 6 or ASME Code Section VIII.10).7. Div.1 paragraphs UG-116 (e)(1) and UW-11(a)(2) to UW-11(a)(4) and stamped “RT-1”. 5.7. INT b. 5. 5. table 4. Rev 9.1. For carbon and low alloy steels. paragraph 7. Div. 1 and Div. The attachment between the bottom head and skirt support shall be provided as a weld build-up or as a forged ring. ≤ 0. Material and Fabrication Requirements for Hydrogen Service Carbon steel shall not be used in fabrication of vessels exposed to Hydrogen Service (paragraph 4. 5. All nozzles shall be integrally self reinforced type. Div.7.12. shall be welded with full penetration on the pressure envelope. a.4.4. the designer may consider the use of corrosion resistant weld overlay. WFMT examination is required according to ASME Code Section VIII. S + P ≤ 0. 2HM (nuts).10.5. For severe sour services.5. Number: 0601 Revision: 9 INT i.VIII.E. 5.5.2.2. On vessels in hydrogen service.7. Div. “FULL” RT of butt welds in accordance with the definition provided in ASME Code Section VIII.2. Div. Standard 0601. 5. Pressure Vessels ASME Section VIII.1. figure UW-16 (f-2) and (f-4) or Sec.015% ii.3. Material and Fabrication Requirements for Carbon Steel Equipment in Amine Service All equipment shall be PWHT after fabrication is complete to avoid Amine Stress Corrosion Cracking (ASCC). paragraph 7.7.9.7.11. Div. 5. 5. All internal attachment welds shall be full penetration type and designed to permit access for inspection.5.45%.4. 5.2. Provided with material chemistry restricted as follows.1.7.1. This decision will be subject to Owner’s Engineer approval.4 shall be applied on category D (Corner welds) of pressure envelope.5. 5. 5. 2 c.7.7.7.3. Gr. Welds on vessels shall be examined as follows.7. Appendix 12 or ASME Code Section VIII.5. Div. Bolting material which is part of a vessel pressure envelope shall be ASME SA 193.3. Div. 5. cladding or solid alloy construction in lieu of carbon steel construction to address corrosion and cracking risks.7.3. Gr. Manual UT examination in accordance with ASME Code Section VIII.5. 5.7. 2 Page 39 of 66 .2. For carbon and low alloy steels.13 so that they can be RT examined.13.3. C. 1 and Div.3. All external attachments on vessels operating in Hydrogen Service. the weld detail between the nozzle and vessel envelope shall be in accordance with ASME Sec.5. Div.5.1.6 on all accessible internal welds.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. c. PWHT shall be required after fabrication is complete. Leg or lug type supports may not be used.7. Material and Fabrication Requirements for Caustic Service Equipment in caustic service shall be designed in accordance with requirements in Figure 1. Reinforcing pads shall not be used.7.6.2. MP or PT examination shall be carried out on all formed surfaces (knuckles and flares) such as formed heads and conical transitions. 5.9.7.6.1 or Div.7. A gradual transition from weld surface to the base metal is required to eliminate stress concentration points. b. In the case that normalizing is provided then the mechanical properties of material shall be reconfirmed. 5.7. a. 5. All cold formed heads made of low alloy steel shall be stress relieved or normalized after forming.7.2.5.5.1.7.7.2. 5.7.5. “Set-on” type nozzles shall not be used.7. Div. 2 5. 1 and Div. 5.5 for cyclic loads. Caustic Soda Service Chart. 2 Page 40 of 66 . All welds between the segments shall be MT or PT examined in accordance with ASME Code.7. The mean diameter of the heads shall match the mean diameter of the skirt support.7.7.5.8.7.7. Rev 9.7.7.7. Reinforcing pads shall not be used.7.6. Leg or lug type supports may not be used. the following supplementary NDE shall be performed on all formed heads fabricated from welded segments.1.7. All welds shall be ground smooth to eliminate sharp corners and edges.7.10. Div.11.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. 1 and Div.7. 5. 5.5. Material and Fabrication Requirements for Cyclic Service The following requirements are in addition to those given in paragraph 5. Section VIII.5. 5.7. Where conical elements are used they shall be complete with torical transitions on the large end (knuckle type). Number: 0601 Revision: 9 All welds shall be ground smooth to eliminate sharp corners and edges. Section VIII. 5. 5. If the hot forming temperature is equal to or greater than the normalizing temperature then additional normalizing heat treatment after completion of forming will not be required. 5. All welds between the segments shall be 100% RT examined in accordance with ASME Code. Div. The requirements for PWHT shall also be applicable to cold formed heads.5. Pressure Vessels ASME Section VIII.3. After forming process. 5. 5. Div. of NACE RP0403-2003.6.7.7. 5.2. 5. A gradual transition from weld surface to the base metal is required to eliminate stress concentration points.4.1 or Div.7. Standard 0601. . P1 P4 P4 P5A P5C P5A P5C P8 ASME Standard SA 516 Gr.(3 Cr – 1 Mo) Low alloy Steels . 317L) A.(3 Cr – 1 Mo – ¼ V) High alloy Steels .1 & 3 SA 336.F3V SA 336 ASME P no. SMALL FORGINGS Material Carbon Steels .F12 Cl.(1 Cr – ½ Mo) Low alloy Steels .4a SA 240 Standard 0601. SA 542.P1 Low alloy Steels .1 & 3 SA 182.(3 Cr – 1 Mo) Low alloy Steels .F22V SA 182.: 304L. 316L. Div.1 & 2 SA 832.(1¼ Cr – ½ Mo – Si) Low alloy Steels .1 & 2 & 3 SA 336. 1 and Div.4a SA 387.F21 SA 182. SA 266. Rev 9. SA 542.F22 Cl. Div.(2¼ Cr – 1 Mo – ¼ V) Low alloy Steels . PIPES Material Carbon Steels .(2¼ Cr – 1 Mo – ¼ V) Low alloy Steels .22V. 317L) A.F22V SA 336.3.(2¼ Cr – 1 Mo) Low alloy Steels .D Cl.g.F21 Cl.P1 Low alloy Steels .1 & 2 SA 182.P8 (e. P1 P4 P4 P5A P5C P5A P5C P8 ASME Standard SA 266.22 Cl.1.(3 Cr – 1 Mo – ¼ V) High alloy Steels .: 304L.P8 (e.(1¼ Cr – ½ Mo – Si) Low alloy Steels .F11 Cl.P8 (e.g.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. P1 P4 P4 P5A P5C P5A P5C P8 ASME Standard SA 106.FP22 N/A SA 369.: 304L. 316L.P1 Low alloy Steels .1 & 2 SA 832.P12 SA 335.B.g.(1 Cr – ½ Mo) Low alloy Steels .4.P11 SA 335.g.(3 Cr – 1 Mo – ¼ V) High alloy Steels . LARGE FORGINGS Material Carbon Steels .70 & 65 & 60 SA 387.12 Cl.2 SA 387.21 Cl.P8 (e. SA 350.(2¼ Cr – 1 Mo – ¼ V) Low alloy Steels .(3 Cr – 1 Mo) Low alloy Steels .(3 Cr – 1 Mo) Low alloy Steels . 2 Number: 0601 Revision: 9 APPENDIX A – TYPICAL FABRICATION MATERIALS A.1 & 2 SA 182.(1¼ Cr – ½ Mo – Si) Low alloy Steels .6 SA 335.FP21 N/A SA 312 ASME P no.F12 SA 336.(2¼ Cr – 1 Mo) Low alloy Steels . 317L) ASME P no.(2¼ Cr – 1 Mo) Low alloy Steels .C Cl.F3V SA 182 ASME P no.11 Cl.: 304L.LF2 SA 182. SA 369.21V. PLATES Material Carbon Steels .(1¼ Cr – ½ Mo – Si) Low alloy Steels .P22.F22 Cl.1 & 3 SA 336.(1 Cr – ½ Mo) Low alloy Steels .(1 Cr – ½ Mo) Low alloy Steels .F11 Cl.(2¼ Cr – 1 Mo) Low alloy Steels .4 SA 336. 316L. P1 P4 P4 P5A P5C P5A P5C P8 ASME Standard SA 105. Pressure Vessels ASME Section VIII. 317L) A.2. 1 and Div.P1 Low alloy Steels .2.(3 Cr – 1 Mo – ¼ V) High alloy Steels . 2 Page 42 of 66 . SA 333.(2¼ Cr – 1 Mo – ¼ V) Low alloy Steels .1 & 2 SA 387. 316L. (1¼ Cr – ½ Mo – Si) Low alloy Steels . 317L) ASME P no. Pressure Vessels ASME Section VIII.g. 1 and Div.P1 Low alloy Steels .1. Rev 9.Cl.WP12.(3 Cr – 1 Mo – ¼ V) High alloy Steels . 2 Number: 0601 Revision: 9 A.WPL6 SA 234.(2¼ Cr – 1 Mo) Low alloy Steels .(1 Cr – ½ Mo) Low alloy Steels .P8 (e. 316L.WP22. Div. SA 420.: 304L.(3 Cr – 1 Mo) Low alloy Steels .WPB.Cl. FITTINGS Material Carbon Steels .MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. 2 Page 43 of 66 . 1 and Div.1. Div. SA 369.FP22 N/A N/A N/A SA 403 Standard 0601.1.(2¼ Cr – 1 Mo – ¼ V) Low alloy Steels . SA 369.5.WP11. P1 P4 P4 P5A P5C P5A P5C P8 ASME Standard A 234.FP11 SA 234.FP12 SA 234. SA 369.Cl. MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII, Div. 1 and Div. 2 Number: 0601 Revision: 9 APPENDIX B – SUPPLEMENTARY REQUIREMENTS FOR VESSELS FABRICATED OF 1 CR-½ MO AND 1¼ CR-½ MO STEELS Unless otherwise specified, all materials type 1 Cr-½ Mo and 1¼ Cr-½ Mo shall meet the following supplementary requirements; B.1. MATERIALS B.1.1. At design temperatures of 750°F (399°C) and higher, in hydrogen service; Roll bonded cladding shall be avoided due to the possibility of disbonding caused by hydrogen. Where cladding is required, explosion bonded cladding or weld overlay shall be used to protect the vessel internal surface. The materials used for fabrication of the pressure envelope shall be Quenched and Tempered (Q&T). B.1.1.1. B.1.1.2. B.1.2. Chemical analysis for each material heat. As a minimum the analysis shall present the concentration (%) of the following elements; C, Si, Mn, Cr, Mo, V, Nb, Ti, Cu, Ni, P, S, Sn, Sb, As. The materials shall have the following restricted chemistry; C < 0.15% Cu < 0.20% Ni < 0.30% P < 0.007% S < 0.007% or (S+P < 0.014%) B.1.2.1. B.1.2.2. B.1.2.3. B.1.2.4. B.1.2.5. B.1.2.6. B.1.2.7. B.1.2.8. B.1.3. PSR = Cr + Cu + 2 x Mo + 10 x V + 7 x Nb + 5 x Ti – 2 < 0 reference [3.2.6.3] X bar = (10 x P + 5 x Sb + 4 x Sn + As) / 100 < 15 reference [3.2.6.3] The chemistry shall be tested with a frequency of one per each melt, heat or batch.The chemistry shall be tested with a frequency of one per each melt, heat or batch. On quench and tempered materials, tensile tests at room and design temperature shall be performed. The tested material shall have been subjected to an equivalent of 3 PWHT. The yield strength shall not be lower than the tabulated values presented in ASME Sec. II D, table “Y-1”. Charpy V impact tests shall be performed according to the methodology presented in API 934A to determine the temperature at which the absorbed energy is 40 ft-lb (T40 temperature). A minimum of 18 specimens (3 specimens at 6 different temperatures) shall be used to generate the transition temperature curve. The tested material shall have been exposed to an equivalent of 3 PWHT cycles. The T40 temperature shall be used as reference value to determine vessel MDMT. The test shall be applied on each heat and/or batch of material (plates, pipes, fitting, forgings). Hardness shall not exceed 225 BHN. Test frequency to be 3 tests per each heat or batch. 100% UT examination shall be provided on all custom forgings (after machining) and plates (heads after forming) used for pressure envelope. As a minimum, the test shall be done as follows; Page 44 of 66 INT B.1.4. B.1.5. B.1.6. Standard 0601, Rev 9, Pressure Vessels ASME Section VIII, Div. 1 and Div. 2 MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII, Div. 1 and Div. 2 B.1.6.1. Number: 0601 Revision: 9 All forgings - Surface scan in accordance with SA 388 and ASME Sec. V, Article 5. For vessels designed to operate in Hydrogen Service, in addition to ASME acceptance criteria, any defect which cannot be encompassed within ¼” (6 mm) diameter sphere, shall be rejected. All plates - Full surface scan in accordance with SA 578 scanning S1. The acceptance level is Level C. For vessels designed to operate in Hydrogen Service, in addition to ASME acceptance criteria, any defect which cannot be encompassed within ¼” (6 mm) diameter circle, shall be rejected. B.1.6.2. B.1.7. All welding consumables to be used shall have the “X” factor limited to 15. The Cu and Ni content shall be limited to 0.20% and respectively 0.30%. Minimum test frequency shall be one per each heat. B.2. FABRICATION B.2.1. B.2.2. B.2.3. All nozzles shall be self reinforced type. The nominal chemistry of welding consumables shall match the nominal chemistry of the base materials. All welding consumables shall be low hydrogen (max. of 8 ml hydrogen per 100 g of weld metal) H8 as per AWS 4.3. The coated consumables as well as the flux shall be baked and stored in accordance with manufacturer’s specifications. The qualification of each WPS shall include Charpy V impact test provided to determine the temperature at which the absorbed energy is 40 ft-lb (T40). This temperature shall be used as reference value to determine the vessel MDMT. Minimum 18 (eighteen) specimens extracted from a weld deposit coupon shall be used to determine T40. All welds performed on pressure envelope (including the attachment welds) shall be preheated at a minimum temperature of 300°F (149°C) through all base metal thickness. The preheating shall be maintained during the welding process. For welds 3” and thicker the preheat shall be maintained without interruption until its completions when a DHT or ISR will be provided. Any attachment weld to the pressure envelope shall be full penetration type. The transition between the attachment and vessel envelope shall be ground smooth and flush to the vessel surface with a transition radius not smaller than ¼” (6 mm). External clips attached to the pressure envelope shall be; Fabricated from materials with similar chemistry as the vessel base metal and shall be attached, by a full penetration weld, directly to the vessel surface. The clips may be fabricated from different type of steel welded on top of a buttering layer applied on the vessel surface. The clip shall be welded on top of this layer with full penetration. INT B.2.4. B.2.5. B.2.6. B.2.7. B.2.7.1. B.2.7.2. B.2.8. On vessels with a wall thickness exceeding 3” (75 mm), after completion of welding an Intermediate Stress Relief (ISR) heat treatment shall be performed on all restrained welds (such as welds around the nozzles). The ISR shall be provided at minimum 1100°F (593°C) for a period of time not shorter than 2 hours. Standard 0601, Rev 9, Pressure Vessels ASME Section VIII, Div. 1 and Div. 2 Page 45 of 66 MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII, Div. 1 and Div. 2 Number: 0601 Revision: 9 B.2.9. On vessels with a wall thickness exceeding 3” (75 mm), all circumferential and longitudinal butt welds shall receive a Dehydrogenation Heat Treatment (DHT). The DHT shall be provided at minimum 600°F (316°C) for a period of time not shorter than 2 hours. B.2.10. The final PWHT shall be performed at a minimum temperature of 1275°F (691°C). The PWHT temperature shall be maintained constant for a period of time equal to; Total minimum time [hours] = Shell thickness [in] x 1 hour B.3. NON DESTRUCTIVE EXAMINATION (NDE) B.3.1. The following NDE sequence shall be provided during the fabrication process; The following NDE shall be performed prior to final PWHT; B.3.1.1. B.3.1.1.1. MT examination on all edges prepared for welding (plates and forgings). B.3.1.1.2. MT examination of formed plates required on pressure envelope (on heads after forming). B.3.1.1.3. MT examination of any temporary external attachment welds, after they have been removed and the surface ground smooth. B.3.1.1.4. RT examination of all pressure retaining butt welds. RT examination can be replaced by computerized UT examination in accordance with Code Case 2235 and standard PQA-GS-0019. B.3.1.1.5. Where applicable, RT examination on all butt welds of the Cr-Mo portion of the skirt support. B.3.1.1.6. Where internal ring supports (fabricated as weld build-up or full penetration welded on vessel surface) are provided, manual UT examination of the junction between vessel surface and internal support rings (provided from outside of pressure envelope). B.3.1.1.7. Where applicable, 10% UT examination of weld overlay bonding (provided from outside of pressure envelope). B.3.1.1.8. Where applicable, PT examination on entire surface of the first layer of weld overlay (applicable only if a second layer of weld overlay will be applied after final PWHT). B.3.1.1.9. Where 300 series stainless steel weld overlay is applied on vessel internal surface, Ferrite number readings of the weld overlay are required before final PWHT. The limitation of ferrite content shall be in accordance with Standard 0903. Readings are required on each element covered with weld overlay as well as on each weld overlay restoration applied over the circular seams. Test frequency is one reading per each weld overlay restoration and each surface covered with weld overlay. B.3.1.2. The following NDE shall be performed after final PWHT but prior to the hydrotest; B.3.1.2.1. RT examination of all pressure retaining butt welds. RT examination can be replaced by computerized UT examination in accordance with Code Case 2235 and standard PQA-GS-0019. For vessel designed in accordance with ASME Section VIII Div.2 the Standard 0601, Rev 9, Pressure Vessels ASME Section VIII, Div. 1 and Div. 2 Page 46 of 66 B. Hardness tests of the weld deposit after final PWHT. B. the concentration of the following elements shall be provided in the inspection report. As a minimum.2. manual UT examination of the weld overlay surface within 2” on both sides of support rings as well as on the machined surfaces of weld overlay (from inside). 1 and Div.3. If internal cladding and/or weld overlay is applied on vessel internal surface.1. B. Production Charpy V impact tests on the weld metal and HAZ at the temperature determined in accordance with the requirements presented in paragraph B.2.3.8. All surfaces covered with weld overlay applied on nozzles.2. Test frequency shall be two (2) locations per weld.1.3.3. b. a.1.1.2. The maximum hardness shall not exceed the limit provided in Standard 0903.3. 1 and Div. PT examination of all finished weld overlay surfaces. Where applicable.3. MT examination of all external attachment welds. MT examination of all butt welds on pressure envelope (from outside) and from inside if there is no internal cladding/weld overlay. B.1.4. Where applicable.4.1. All weld overlay applied over the base metal seams. from outside. Where applicable.2.3. B.2.3.1. B. 2 Number: 0601 Revision: 9 computerized UT examination shall follow the requirements provided in paragraph 7.1. C. Where applicable. Div.3.9. Div. B. The following NDE shall be performed after hydrotest.3.3.3.3. B.4.3. B.3.2. as follows. manual UT examination of the junction between vessel surface and internal support rings (from outside).MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. MT examination of the junction between the skirt and vessel envelope.5. The test frequency shall not be less than two (2) locations per weld.3.3.1.3.1. B.5.2.1.2 of the Code. The acceptable limits shall be in accordance with the requirements provided in Standard 0903.4. All the other pressure retaining welds shall be manual UT examined.1. Where applicable. Where applicable.2.7. Rev 9. One set of 3 specimens shall be provided for each WPS and for each batch of welding Page 47 of 66 B.2. Hardness tests on the weld deposit of all butt welds located on the Cr-Mo portion of skirt support.3.6.3. Chemical analysis tests of 300 series stainless steel weld overlay. The tests shall be performed on external surface. Pressure Vessels ASME Section VIII. The maximum hardness shall not exceed 225 BHN.3.1. B.1. The examined surface shall be free of any disbondment. Ni. manual UT examination of the weld overlay deposit. B. manual UT examination of the junction between pressure envelope and skirt support. PT examination of all internal attachment welds.1. Cr.3. Cb. Standard 0601. B. 2 .2.1. Mo and V. B.2. Rev 9. Div. 2 Page 48 of 66 . 1 and Div.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. Run-off tabs shall be used wherever possible. Div. The absorbed energy shall not be lower than 40 ft-lb. The specimens shall be heat treated to an equivalent of 3 PWHT cycles. 1 and Div. Pressure Vessels ASME Section VIII. Standard 0601. 2 Number: 0601 Revision: 9 consumables. the formed or forged heads shall be hemispherical type. All pressure boundary components shall have the same nominal material chemistry.1.5.13.1. INT C. C.1. C.2. shall be fabricated in accordance with one of the following alternatives.2.1. Within the limitations imposed by shell thickness.1. Where cladding is required. C.VIII.6. roll bonded cladding shall be avoided due to the possibility of disbonding caused by hydrogen.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.6.1. All corners and transitions of the weld build-up shall be rounded in order to reduce stress concentrations. Standard 0601. For thicknesses exceeding 2” (50 mm). C. 1 and Div.1. all custom made flanges that will be bolted on piping system shall be designed in accordance with ASME Code Section VIII.2. 2¼ CR-1 MO-¼ V. fully machined. in accordance with ASME Sec. Integral forged ring (“Y” ring).2 paragraph 4.1 (details f1 to f4) or in accordance with ASME Code Section VIII.3. INT C. Minimum radius shall not be less than ½” (12 mm). 2 Number: 0601 Revision: 9 APPENDIX C – SUPPLEMENTARY REQUIREMENTS FOR VESSELS FABRICATED OF 2¼ CR-1 MO.1. Div.1.4.1. Div. DESIGN C. C.1. Flange geometry shall allow the possibility of using hydraulic bolting tensioners.2. detail 7. the end of the shell may be fully machined to accommodate the transition required to bottom head and skirt support.1. 2 table 4.3. C. Machined weld build-up. C.2.1. Div. The minimum height of the forged portion of these rings shall be ½” (12 mm). Rolled plates for wall thickness 6” (150 mm) or smaller.1. Rev 9. The shell components shall be fabricated as follows. C.VIII. C.5. 2 Page 49 of 66 . All nozzles shall be forged self-reinforced type designed for butt-welding in accordance with ASME Sec.1.8.2.1.1.2 table 4. Pressure Vessels ASME Section VIII.4. For vessels designed in accordance with ASME Code Section VIII.6.1 fig.4). explosion bonded cladding or weld overlay shall be used to protect the vessel internal surface. Internal rings designated to support catalyst beds or any other trays. the junction between the bottom head and the skirt support shall be designed as follows. At design temperatures of 750°F(399°C) and higher. Integrally forged cylinders for wall thickness exceeding 6” (150 mm).1. 1 and Div.2. Partially forged with the vessel shell with the remainder of the ring fabricated from weld build-up. C.1.1. in hydrogen service. Div.1. Integrally forged with the vessel body.4. Div.1. C. UW 16. C.1.1. 3 CR-1 MO AND 3 CR-1 MO-¼ V STEELS The requirements presented in this appendix are supplementing the requirements for design and fabrication of vessels designated to operate in Hydrogen Service at high pressure and high temperature (reference 3.2. Dissimilar welding techniques between parts of the pressure envelope shall be avoided. C.4.7. Div.2. Div.16 and using the allowable stresses defined for ASME Section VIII.2. Div. On vertical vessels.6. 5.11.1.010% or S + P = max. Rev 9.007% C. All internal welded attachments subjected to negligible mechanical loads (maximum 10 ksi stress in the welds).5.5.2. External welded attachments on the pressure envelope shall be reduced to minimum. 0. 0.1.2.5. the space between the external surface of the bottom head and the top of skirt internal surface shall be provided with a minimum 10” (250 mm) deep hot box. See the additional requirements presented in paragraph 3.2. C.2. Pressure Vessels ASME Section VIII. heads and large nozzles as well as for transition between bottom head and skirt support shall be Quenched and Tempered (Q&T). The materials used for fabrication of shells. 0. Div.1.014% Page 50 of 66 Standard 0601. INT C.1. P = max.2. Mn = max 0.014% For material with thickness 4” (100 mm) and greater. 0.2.2.2.3. can be attached by full penetration welding directly on the vessel internal surface before the final PWHT or.1. All gaskets shall be provided with external rings. The weld shall have a smooth transition to the vessel surface with a radius of minimum ¼“ (6 mm).MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.3. all gaskets shall be spiral wound type 321 stainless steel windings and graphite filler. or S + P < = 0.3.1.20% C.2. 2 . Unless otherwise specified. For material less than 4“ (100 mm) thick. C.1.35% C.2.2. C.1.5. Div.2.5.5.2.3.4.000 < 100 C. S = max.10.5% C.5.2. C = max 0.2.2.5. the weld overlay can be completed in one layer welding technique (such as 309 LNb or 309 LMo stainless steel) or multi-layer welding technique using a combination of type 309L as a first layer and type 309 LNb or 309 LMo stainless steels as second layer. P = max.2.1.2. The manway gasket shall also be provided with 321 type stainless steel inner retention ring. C.2. 0. Ni = max 0. Cu = max 0.2. C.2. 2 Number: 0601 Revision: 9 C.9.13% C. S = max.25% C. 1 and Div. C. on the weld overlay surface after the final PWHT. where applicable.5. MATERIALS INT C.1. C.4.6.5.2.2.5.1. The chemistry of pressure envelope base metal shall be restricted as follows. C. Where required.6.1.2. The insulation supports shall not be welded directly to the vessel surface. INT C.007% C.3. Si = max 0.2.1.5. Insulation supports shall be strapped around the vessel surface.005% C. C.5.11. The materials used for pressure envelope components shall meet the following requirements. “J” factor = (Si + Mn) x (P + Sn) x 10.5.2.1. 1 and Div. On the vertical vessels provided with skirt support. The specimens shall be subjected to the following heat treatments.11. They have to be extracted form half thickness of material.8.2. the specimens shall be Charpy V-notch impact tested at a minimum six (6) different temperatures (3 specimens at each temperature) in accordance with paragraph 6. Fabricator shall provide test data indicating the mechanical properties (Tensile strength. Pressure Vessels ASME Section VIII. Set 2 – Exposed to an equivalent of maximum PWHT cycle plus the step cooling heat treatment.2.2. Standard 0601.2.2 paragraph 3. applied on two (2) sets of specimens with minimum eighteen (18) specimens per set. The tests shall be performed at room temperature.7. Materials shall be selected such that their mechanical properties are acceptable as specified on the equipment data sheet after the equivalent of three (3) full PWHT cycles and the required ISR. Table U.2. Sb. INT C. P. Fabricator shall provide records of austenitizing and tempering temperatures as well as photographic records including metallography for each material heat or batch. Number: 0601 Revision: 9 Records of chemical analysis for each material heat or batch shall present the concentration (%) of the following elements.2.3 or ASME Code Section VIII.2. C. C.2.5. Mn.5. Yield strength and Toughness) on heat-treated (Q&T) materials exposed to simulated minimum (one cycle) and maximum (3 cycles) PWHT.3.Exposed to an equivalent of minimum PWHT cycle to determine the transition temperature curve before step cooling heat treatment. Cr.5. The photographic records shall be provided on specimens located at half thickness.3. Si.1. C.5. Div.6. For base metals.5. Sn.5. Rev 9.8.8.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. C. INT C. Fabricator shall perform Step Cooling Tests using the step temperatures. In all cases the Yield strength values shall not be lower than the tabulated values presented in ASME Code Section II D.5. Mo. 2 C. C. Div.2.2. The test specimens shall also satisfy the requirements presented in ASME Code Section VIII.5. ΔCV (TT 40) = Shift of Temperature (temperature difference) corresponding to 40 ft-lb (55J) energy obtained on specimens exposed to maximum PWHT cycle and step cooling heat treatment. 2 Page 51 of 66 .5. Cooling from the austenitizing temperature shall result in a minimum 90% bainite.4. Set 1 . For weld deposit.1 paragraph UG84.4. Cu. After heat treatment. CV (TT 40) + 3 × ΔCV (TT 40) ≤ 32° F CV (TT 40) + 3 × ΔCV (TT 40) ≤ 50° F where: CV (TT 40) = Temperature corresponding to 40 ft-lb (55J) energy obtained on specimens exposed to minimum PWHT cycle.8. Table Y-1.2. 1 and Div.2. S.8. If not otherwise specified the acceptance criteria for the 40 ft-lb (55J) absorbed energy shall be in accordance with the following formulas.5. Ni. The Tensile strength values shall not be lower than 90% of the tabulated values presented in ASME Code Section II D.5.1 of API 934A in order to develop two (2) transition curves. holding times and cooling rates in accordance with API 934A paragraph 5.3. C. As. Div. 1 and Div. C. Div. V. the Bruscato “X” factor shall not exceed 15 ppm.5. any defect which cannot be encompassed within ¼” (6 mm) diameter sphere. For vessels designed to operate in Hydrogen Service.5. the test shall be done as follows.2. shall be rejected. Material hardness (3 tests per each material heat) shall not exceed 225 BH for conventional Cr. the number of step cooling tests required on materials shall be established as follows. Custom made forgings used for shells and nozzles .Full surface scan in accordance with SA 578 scanning S1. of 8 ml hydrogen per 100 g of weld metal) H8 per AWS A4.5. C.7. Standard 0601. In situations where flux has been changed for a given batch.2. 100% UT examination shall be provided on all custom forgings (after machining) and plates (heads after forming) used for pressure envelope.2.9.2. shall be rejected.2. Div. C. As a minimum. C. any defect which cannot be encompassed within ¼” (6 mm) diameter circle. All plates . C.9. For vessels designed to operate in Hydrogen Service.2.2.11. All forgings .MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. each batch and flux combination shall require testing. C. Article 5. All surfaces of forgings as well as the formed plates shall be MT examined in accordance with API 934A paragraph 8. C. C.5.2. 1 and Div. Fabricator shall provide for review and approval of the standard procedure used to handle the flux.2.9. in addition to ASME acceptance criteria. electrodes and other welding consumables which may absorb humidity from ambient. Any external or internal projection of the weld deposit shall be limited to maximum ⅛” (3 mm).11. 2 C.1. C.10. Pressure Vessels ASME Section VIII. The nominal chemistry of all welding consumables shall match the nominal chemistry of the base materials.5. FABRICATION C.9.9.3. C.8.2. C. Plates – The test shall be applied on the heat with the highest “J” factor. The acceptance level is Level C.1.2.2. For welding consumables.2.3. All welding consumables including fluxes shall be low hydrogen (max.6.12.2. 2 Page 52 of 66 .5. Rev 9.1. V. All bevels shall also be examined. Welding consumables – The test shall be applied on weld deposits made of each batch or lot.3. All welds required on pressure envelope shall be full penetration type.3. C. 1 and Div. C. Number: 0601 Revision: 9 As a minimum.11. C.Surface scan in accordance with SA 388 and ASME Sec.2. Coated welding consumables as well as the flux shall be baked and stored per manufacturers recommended practice.The test shall be applied on each material heat.5.5.2. Any butt weld shall be ground smooth to the vessel surface.2.5.Mo steels and 235 BH for Cr-Mo-V steels. in addition to ASME acceptance criteria. Div. The preheat temperature shall be maintained without interruption until the weld is finished and an Intermediate Stress Relief (ISR) or Dehydrogenation Heat Treatment (DHT) is performed.2. directly to the vessel surface. 1 and Div.2. C.1. Div.3.3.3. C.3.8. The minimum DHT temperature shall not be lower than 690°F (366°C) and shall be maintained for minimum 4 hours. each welding procedure specification (WPS) used on the pressure envelope shall be qualified in accordance with API 934A. External clips attached to the pressure envelope shall be. the thickness of weldmetal deposited per pass shall typically be ¼” (6 mm). FCAW may be used only for weld overlay application. C. All welds performed on the pressure envelope (including the attachment welds) shall be preheated in accordance with the requirements presented in API 934A paragraph 7.5.4. Div. The FCAW welding process shall not be used for any weld required for the vessel pressure envelope or for the low alloy portion of skirt support.3. All joints between the nozzles and vessel body shall be fabricated with the bevels designed for butt-welding. Welds having thicker weldmetal deposition per pass are not acceptable due to their low toughness.2. INT C.2.3.7. Maximum permissible strip width is 5“ (125 mm).2.3. Rev 9. INT Standard 0601. 1 and Div. 2 Number: 0601 Revision: 9 C. Transition between the attachment and vessel envelope shall be ground smooth and flush to the vessel surface with a transition radius not smaller than ¼“ (6 mm).6. No equivalent substitute shall be allowed. When welding the basemetal of pressure envelope. paragraph 7. All consumables used throughout all the fabrication process shall be similar (same brand name. As a minimum. C. The clip shall be welded on top of this layer with full penetration. the application of DHT in accordance with API 934A paragraph 7.12. For unrestrained welds with thickness less than 7” (178 mm).9.3. by a full penetration weld.3. type and source of fabrication) to that used for the PQR associated with the qualified and approved WPS.3. shall be developed in accordance with the requirements presented in API 934A paragraph 6.10.3.3.3 may replace the ISR. C.3. 2 Page 53 of 66 . C. C.3.3.3. The Step Cooling Test required for WPS qualification.2. All restrained welds and any unrestrained weld with a thickness 7” (178 mm) and greater shall be subjected to ISR heat treatment in accordance with the requirements presented in API 934A paragraph 7.2.11.3.1. Fabricated from materials with similar chemistry as the vessel base metal and shall be attached.3. The ISR temperature shall not be lower than 1250°F (677°C) and shall be maintained for minimum 2 hours for weld thicknesses up to 7” (178 mm) and minimum 4 hours for weld thicker than 7” (178 mm).12.3. C.1. C.3. C. C.3. C.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. The ESW process may be utilized with Owner’s Engineer approval with the following restrictions. The clips may be fabricated from different type of steel welded on top of a buttering layer applied on the vessel surface. Pressure Vessels ASME Section VIII. Any attachment weld to the pressure envelope shall be full penetration type. after they have been removed and the surface ground smooth. previously qualified disbonding test results can be submitted for review and approval by Owner’s Engineer where representative of the proposed WPS and operating conditions. MT examination on all edges prepared for welding. The test coupon shall be 100% UT examined 10 days after cool down and shall have zero percent disbondment. C. MT examination on all butt welds on the skirt support as well as on the weld between skirt and base ring. C.5.4.5.14.4. C. MT examination of any temporary attachment welds.5. As a minimum. provided in accordance with the requirements presented in the previous paragraph shall be applied after the final PWHT. Each flange face.1. C.15.3.4. 1 and Div.1. C.3.13. C. As an alternative.13. After weld overlay application.4. Div. After weld overlay application.3.4. Minimum thickness of last finished layer of weld overlay shall be ⅛” (3 mm). paragraphs 7. the seal face of the flange shall be machined. C. All nozzle internal surfaces.2. C. The following NDE shall be performed prior to final PWHT.12.1. C. The entire weld overlay shall be applied before the final PWHT with the exception that the second pass of weld overlay.13. C.13.3. Any crack type defects shall be rejected. Div.3. 2 Number: 0601 Revision: 9 C. Maximum acceptable size of defect shall not exceed ¼“ (6 mm). UT examination of the heads after forming and prior to weld overlay application.2. C. All WPS to be used for weld overlay application shall be supported by PQR’s containing disbonding test results and acceptance criteria. MT examination of the welds between the vessel envelope and supports. 1 and Div. NON DESTRUCTIVE EXAMINATION C.4. Rev 9. Pressure Vessels ASME Section VIII.13. The flux used for production welding shall be identical to that used for procedural qualification.3. When weld overlay is applied by manual or semi-automatic welding process. C. Multiple pass weld overlay (first layer of type 309L followed by a minimum one layer of 309LCb or 309LMo) is required on the following surfaces.6. C.3.1.2.13. C.3.3.1. Where applicable. The minimum thickness of the last pass weld overlay shall be 3/16” (5 mm). 2 Page 54 of 66 .3.4. Standard 0601.4.3 and 7.5.2.4.1.5. C. Test shall be performed in accordance with SA 578 Scanning S1. All surfaces of each support ring including the transition zone between the ring and the shell surface. MT examination on all external attachment welds.2. The overlay restoration applied over the butt welds around each nozzle.1. the disbonding test procedure shall meet the requirements presented in API 934A.3.1.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. the upper surface of each ring support shall be machined. The minimum thickness of last layer of weld overlay shall be ⅛” (3 mm).4.1. C. on weld overlay restoration over the pressure welds as well as on the weld overlay applied on the ring supports. Manual UT examination of the junction between the bottom head and the skirt support. The location of all defects shall be mapped and presented to the Client for review and approval. PMI examination.7. C. All shells and heads.4. The following NDE shall be performed after final PWHT but prior to the hydrotest. Div.11.2. or UT examination in accordance with Code Case 2235 and standard PQA-GS-0019 of all circumferential and longitudinal butt welds between cylindrical shells and heads (after ISR or DHT). 1 and Div.4. 2 C. 1 and Div. Manual UT examination (from outside of the vessel envelope) of the weld overlay applied on the following surfaces. No defects are acceptable within the weld overlay applied on nozzle surfaces. or manual UT examination on all circumferential butt welds around the nozzles or other restrained butt welds not specified above (after ISR).MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.4.4.4.2.4. C.1.1. C. PT examination of all finished weld overlay surfaces. Standard 0601. 2 Page 55 of 66 . Manual UT examination of all junctions between the shell and internal ring supports (from outside of the vessel envelope).6 mm) oriented in any direction across the weld and HAZ.4. C. Determination of ferrite number (FN) on weld overlay surface. The fabricator shall prove that computerized UT examination will be able to detect defects not larger than 1/16” oriented in any direction across the weld and HAZ. NOTE: Unless otherwise specified by client or process licensor.4.7.1. C. C.2.8.3.9. C.4.2. C.4.2.2. The fabricator shall prove that computerized UT examination will be able 1 to detect defects not larger than /16” (1.2.4.4.4. Manual UT examination of the weld build-up applied on internal rings after finishing (machining) of weld overlay surface (from machined weld overlay surface). Rev 9.4. PT examination on first layer of weld overlay.4. C.12.2.6. C.2.5. C.4.2. maximum acceptable defect size of any disbondment shall not exceed ¼“ (6 mm) diameter.9.1.1. C.1. Pressure Vessels ASME Section VIII. UT examinations in accordance with Code Case 2235 to the maximum possible extent of all butt welds.2. RT examination.10.1. All nozzles. Manual UT examination of the weld overlay surface within 2” (50 mm) on both sides of support rings as well as on the machined surfaces of weld overlay (from inside). Div.4. The examination is required only where the second layer of weld overlay will be applied after final PWHT. C. Manual UT examination of all remaining butt welds. The maximum density of acceptable defects shall not exceed the ratio of one defect per 10 ft² ( 1 m²). Number: 0601 Revision: 9 RT examination.8. C. lack of fusion.1. No cracks. incomplete penetration. C.4.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. paragraph 7.3.5. C. Spot PT examination of the weld overlay. or sharp corners and transitions will be accepted. lack of fusion. C.VIII. paragraphs 7.4.2.4. Manual UT examination of all locations where defects were detected prior to the hydrotest. Div.4 and 7. Div. paragraph 7. This request is in addition to the qualification of the WPS/PQR.6.7.2.5 with the supplementary restriction that maximum acceptable defect size shall be limited to ¼“ (6 mm) regardless of thickness.3. C.2 but not less than two (2) locations per weld.2. Mo and V.1. Defect acceptance criteria for MT technique shall be in accordance with ASME Code Sec. The concentration of the following elements shall be determined.6.5. Defect acceptance criteria for RT technique shall be in accordance with ASME Code SEC.4. C.4.2.VIII. the test frequency shall be of two (2) samples per each independent surface covered with weld overlay.9. Div. Div. Defect acceptance criteria for UT technique shall be in accordance with ASME Code Sec. Standard 0601. paragraph 7. Div. The following NDE shall be performed after vessel hydrotest. The hardness (minimum one test per weld) shall not exceed 225 BH for conventional Cr. Appendix 12 or Section VIII Div.8.11.1 Appendix 6 or Section VIII Div. The hardness (minimum one test per weld) shall not exceed 225 BH for conventional CrMo steels and 235 BH for Cr-Mo-V steels.3. Pressure Vessels ASME Section VIII.4. Hardness tests of the welds of vessel pressure envelope.3.4.Mo steels and 235 BH for Cr-Mo-V steels.4.2.VIII. The junctions between the vessel body and all internal support rings as well as between the bottom head and the skirt support shall be free of cracks.5. C.3.3. Chemical examination of the weld overlay. or sharp corners and transitions. 2 Page 56 of 66 . C. The test frequency shall be as follows. As a minimum. Readings are required on each element covered with weld overlay as well as on each weld overlay restoration applied over the circular seams one reading per seam.4.5. incomplete penetration.2.4.5.1. undercuts.1” measured from process surface.3 with the supplementary restriction that maximum acceptable defect size shall be limited to ¼“ (6 mm) regardless of thickness. Appendix 4 or Section VIII Div.10. Div. PT examination of all internal attachment welds. 1 and Div. Defect acceptance criteria for PT technique shall be in accordance with ASME Code Sec.2. undercuts. Ni.4.4. Hardness tests on the weld deposit of all butt welds located on the low alloy portion of skirt support. Test frequency shall be in accordance with API 934A. C. Chemical analysis tests of type 347 or type 316L weld overlay deposit shall be within the standard limits for a depth of minimum 0. Cr.7. The acceptable range shall be restricted between 4 and 10. Rev 9. C.1. C. The test frequency shall not be less than two (2) locations per weld. Cb. concave root.4. Appendix 8 or Section VIII Div. 2 Number: 0601 Revision: 9 C.5. Ferrite number readings of the weld overlay shall be performed before final PWHT.4.4.VIII. C. paragraph 7.4. C. C. 1 and Div. C. Minimum two (2) ferrite readings on the surface surrounding each location selected on weld overlay restoration applied over strength welds and nozzles.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.5. During the local PWHT cycle. If local PWHT will be required.5. Rev 9.5. 2 Page 57 of 66 . the weld overlay shall receive minimum exposure to the PWHT. 2 C. Pressure Vessels ASME Section VIII. any portion of the wall within a length of (R x t)0. heads and ring supports. C.2.9. Div.4. 1 and Div. C.4.9.2. POST WELD HEAT TREATMENT C. C. Standard 0601.5. Number: 0601 Revision: 9 Minimum six (6) ferrite readings on the surface surrounding each location selected on the shell. 1 and Div. the length of heated zone shall not be shorter than (R x t)0.1. the chemistry of the flue gas shall be controlled so that the concentration of excess oxygen will be kept to a minimum. The fabricator shall sequence the weld overlay application considering both the ISR and PWHT cycles. If furnace is used. Due to the possibility of overlay embrittlement and cracking induced by the formation of sigma phase during PWHT cycle. C.5.1. Div.4.5 on each side of the weld where “R” is the vessel external radius in inches (mm) and “t” is the wall thickness in inches (mm).5 adjacent to the furnace shall be maintained at a temperature not lower than 400°F (204°C).3. 3. GENERAL D. paragraph 5.1. On vessels operating at temperatures over 750°F (399°C). Pressure Vessels ASME Section VIII.1. circle or does not meet ASME Code acceptance criteria. The largest defect shall not exceed the limits provided in acceptance Level B.3. D.3.4. The yield strength (Sy) of the materials.2. FABRICATION D. D. The heat treatment shall be selected as such to ensure the uniformity of steel microstructure across thickness. table 4. Heavy wall vessels represent all vessels with a wall thickness exceeding 2” (50 mm) regardless of the type of material used for pressure envelope.3.2. D.2. All nozzles shall be integrally self reinforced type. D. which cannot be encompassed within ½” (12 mm) dia.6.2.1.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.1. All custom made forgings shall be UT examined in accordance with SA 388 and ASME Sec.3. Materials for vessels designed to operate in General Service shall be scanned in accordance with SA 578.V.VIII.4.3.1.VIII. all nozzles shall be ground smooth and flush with the internal vessel surface.3.2. All internal attachments shall be welded with full penetration.1. D.4. Rev 9. NOZZLES D. Div. D.5. Presence of Widmanstatten structures or ferrite grain size coarser than #5 shall not be accepted. All external attachments on vessels operating at temperatures over 750°F (399°C) shall be welded with full penetration on the pressure envelope. MATERIALS D. D. shall not be lower than the tabulated values presented in ASME Section IID table Y-1. 1 and Div. All butt welded joints on pressure envelope shall be welded with full penetration from both sides.2. All MTR’s for plates and forgings shall have a photomicrograph. Any defect. D.1. all forgings required for nozzles shall be supplied in the Normalized and Tempered (N&T) or Quench and Tempered (Q&T) condition. Div.2. The actual tensile strength value shall be provided for information only.1.4. Div.4.1. 2 Page 58 of 66 . Standard 0601. 1 and Div. as well as on vessels with pressure envelope of 3” (75 mm) and thicker.2. D.13 so that they can be RT examined.2.4. 2 Number: 0601 Revision: 9 APPENDIX D – SUPPLEMENTARY REQUIREMENTS FOR HEAVY WALL VESSELS D. The MTR’s shall document the ferrite structure and grain size. Except where internal nozzle projection is specified. Div.2.3. D. All plates shall be UT examined in accordance with SA 578 and the following requirements. D. the weld detail between nozzle and vessel envelope shall be in accordance with ASME Sec.2. in accordance with ASTM E112. All materials shall be Charpy “V” impact tested at MDMT temperature. shall be rejected. If not otherwise specified. figure UW-16 (f-2) and (f-4) or Sec. D. D.2.2. 4.5. Div. D. D. If vessel internal surface in covered with cladding or with weld overlay. 1 and Div.5.5. D.5. All butt-welded joints on the pressure envelope shall be RT examined after final PWHT. NON DESTRUCTIVE EXAMINATION (NDE) D. Standard 0601.3.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.1. Pressure Vessels ASME Section VIII.5.4.5. All attachment welds (both internal and external) shall be MT examined after final PWHT. 1 and Div.4. All edges prepared for welding shall be MT examined. D. RT examination may be replaced by computerized UT in accordance with ASME Code Case 2355 and standard PQA-GS-0019. D. 2 Number: 0601 Revision: 9 D. 2 Page 59 of 66 . All category “D” welds on the pressure envelope shall be UT examined after final PWHT.2.5. Div. Rev 9. All attachment welds on vessels operating over 750°F (399°C) shall be flush smooth to the vessel surface with a radius of ¼” (6 mm) or larger. The examination procedure shall be reviewed and approved by Owner’s representative prior to being used. the MT examination shall be replaced by PT examination. 1 and Div.2.3 FR = b x 2000 x D MR = b x 164 x D2 (N) (N-m) (N-m) (N-m) (N) (N-m) Standard 0601. Metric units: FR = b x 449. 1 and Div.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.1.9 x D² Circumferential Bending Moment MC =b x 73.1. Div.8 900 1.6 Table 5 300 600 0. refer to Table 6 below to establish nozzle load requirements.2. Imperial units: (lb) (ft-lb) (ft-lb) (ft-lb) (lb) (ft-lb) E.0 2500 3. for imperial and metric formulas) FR = Radial Force ML = Longitudinal bending moment MR = Circumferential bending moment b = factor based on flange class rating per Table 5 below. Nozzles NPS 30 and larger. Rev 9.6 x D MR = b x 121 x D2 • Nozzles located on cylindrical shells: Radial Force FR = b x 2000 x D Longitudinal Bending Moment ML = b x 130 x D² Circumferential Bending Moment MC=b x 100 x D² Resultant Bending Moment MR = (ML2 + MC2)1/2 = b x 164 x D2 • Nozzles located on heads: Radial Force Resultant Bending Moment Where: D = Nozzle nominal diameter (in. the following formulas shall be used to determine forces and moments to be ued for nozzle design.8 1500 3.1.2. • Nozzles located on cylindrical shells: Radial Force FR = b x 449.1. 2 Page 60 of 66 .6 x D Longitudinal Bending Moment ML = b x 95.7 0.2.1. Flange Class Rating ‘b’ factor 150 0. For sizes NPS 1½ thru NPS 24. GENERAL E. 2 Number: 0601 Revision: 9 APPENDIX E – NOZZLE LOADS FOR VESSELS FABRICATED FROM STEEL E. Div.1.8 x D² Resultant Bending Moment MR = (ML2 + ML2)1/2 = b x 121 x D2 • Nozzles located on heads: Radial Force Resultant Bending Moment E. Pressure Vessels ASME Section VIII.1. E. Div. Rev 9.246 2. Pressure Vessels ASME Section VIII.2.092 2.1. 2 E.215 1.160 Page 61 of 66 1½” 2” 3” Standard 0601.1.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.158 3. 1 and Div. 1 and Div.938 3.493 4.350 1. E.160 1.2.804 5. Div. The pipe loads are considered acting at the junction between nozzle and vessel envelope per the orientations shown in Figure 2 below.979 2. Figure 2 FR MC ML Table 6 Nozzle NPS Class 150 300 600 900 1500 2500 150 300 600 900 1500 2500 150 300 600 900 1500 2500 FR (lb) 375 445 505 570 630 695 605 710 810 910 1010 1110 810 945 1.535 2.4. 2 .080 1.603 4.691 3.3.485 MC and ML (lb-ft) 103 125 125 125 148 148 184 184 243 243 273 273 428 428 553 723 856 856 FR (N) 1.405 6.606 MC and ML (N-m) 140 170 170 170 200 200 250 250 330 330 370 370 580 580 750 980 1.802 3.603 4.048 4.668 1.005 6.204 4. Number: 0601 Revision: 9 The loadings computed from these equations shall be considered as being caused by 67% thermal and 33% dead weight load. 010 14.900 13.190 Number: 0601 Revision: 9 4” 6” 8” 10” 12” 14” MC and ML (N-m) 1.463 18.139 9.405 8.814 19.460 35.149 13.600 10. 2 Table 6 Nozzle NPS Class 150 300 600 900 1500 2500 150 300 600 900 1500 2500 150 300 600 900 1500 2500 150 300 600 900 1500 2500 150 300 600 900 1500 2500 150 300 600 900 1500 2500 FR (lb) 1.880 3.194 25.700 2.817 15.155 6.015 2.653 8.605 6.460 3.060 3.310 12.008 5.160 14.260 1.608 11.430 2.470 39.010 13.210 22.696 1. Div.537 3.594 21.440 4.800 1.007 8.110 9. 1 and Div.620 1.412 16.100 28.054 3.407 9.050 41.080 6.760 18.080 45.992 26.090 1.825 6.814 19.747 5.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.014 17.807 7.868 7.014 17.708 9. Div.315 5.620 1.696 2.710 6.140 5.412 16.900 35.298 1.380 5.600 4.809 12.440 1.080 1.104 25.930 27.090 1.000 32.580 58.405 5.163 28. Pressure Vessels ASME Section VIII.206 8.604 10.968 4.940 37.811 14.804 5. 1 and Div.450 13. 2 Page 62 of 66 .210 12.777 10.020 14.600 4.150 30.160 2.200 25.756 9.875 33.106 3.474 FR (N) 4.045 5.390 13.450 1.406 13.300 2.124 2.160 2.860 5.880 3.432 16.405 7.240 3.840 61.563 20.320 25.012 16.993 22.070 1.760 2.520 2.790 6.700 3.940 Standard 0601.206 8.050 16.020 11.150 3. Rev 9.892 10.620 43.620 7.630 16.890 2.240 3.949 19.780 4.860 12.300 2.310 21.669 9.970 2.211 9.780 4.363 11.608 10.212 4.170 14.980 1.408 6.756 MC and ML (lb-ft) 804 804 1. 584 14.920 154.450 77.430 27.410 25.660 60.805 15.475 7.430 46.080 125.320 16.824 30.949 57.315 50.285 5. Rev 9.299 59.761 FR (N) 19.144 24.825 17.194 22.050 93. Pressure Vessels ASME Section VIII. Div. 1 and Div.295 8.400 30.453 113.860 12.346 17.315 5.940 78.555 8.094 132.908 20.951 21.150 21.011 46.150 23.024 26.571 103.890 107. 2 Table 6 Nozzle NPS Class 150 300 600 900 1500 2500 150 300 600 900 1500 2500 150 300 600 900 1500 2500 150 300 600 900 1500 2500 150 300 600 900 1500 2500 FR (lb) 4.154 44.420 80.010 52.160 28.100 22.090 74.030 75.736 12.397 27.199 34.130 26.510 67.320 11.247 35.190 23.035 6.935 6.670 4.800 74.520 41.220 38.080 35.340 52.131 92.220 22.701 16.089 42.935 14.931 68.100 69.665 7.640 65.860 54.820 95.710 16.060 119.440 47.002 37.270 29.596 25.860 93.708 34. Div.606 39. 1 and Div.925 8.836 24.910 Number: 0601 Revision: 9 16” 18” 20” 22” 24” MC and ML (N-m) 17.070 20.484 MC and ML (lb-ft) 12. 2 Page 63 of 66 .802 33.110 62.395 6.050 76.260 108.715 59.806 20.375 57.641 88.804 38.770 80.910 25.220 110.450 48.770 179.170 81.030 102.170 99.855 5.050 48.998 28.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.765 35.871 18.990 Standard 0601.410 57.400 70.655 10.530 18.619 11.950 5.370 57.590 139.091 6.119 8. 1 and Div. 5.2. Additional information about this phenomenon is provided in WRC275. the absorbed hydrogen will recombine in molecular form and will generate a very high stress (>80. It is recommended that shop hydrotest pressure shall be calculated using vessel MAWP as a reference.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. 30% of allowable stress per Div.2.2. 5. 1 and Div. As acceptable alternate. The “temper embrittlement” and “hydrogen embrittlement” deteriorate the mechanical properties of brand new materials (particularly the toughness gets reduced).1. Temper embrittlement is generated by separation of low melting temperature elements (such as Sn.9 5. Additional information is provided in WRC-275.9. 5.7. On 1 Cr and 1¼ Cr steels the effect is shadowed by carbide formation. Generally the temper embrittlement occurs when the high strength low alloy steels are exposed at temperatures between 950°F (510°C) and 1300°F (704°C) (within PWHT temperature range).11 (from Div.1) or paragraph 3. 25% of design stress intensity per Div.9 This is an empirical formula resulted from a series of tests described in reference 3.4. Rev 9. See reference 3.2. WRC-305 and in reference 3.000 psi) that will lead to local plastic deformations. it is possible to expose the material at a stress level that will not exceed approximately 16% of Yield Strength (approx.2).1 or approx. In accordance with ASME Code paragraph UCS (from Div. As. During operation the atomic hydrogen is absorbed in the metal structure.1.2 5.7. micro -cracks and formation of micro voids in the steel structure. At shut-down. The hydrogen embrittlement occurs during the operation when the steel is exposed to Hydrogen Service. P) at the boundary of the grain structure. The relation between hardness values and PWHT temperature shall indicate the limit over which the stress relaxation occurs. In accordance with this interpretation the “Design Pressure” can be equal with the MAWP or higher than it.2). the PWHT temperature may be established experimentally for given purchased steel by using hardness test results provided on welded specimens exposed to different PWHT temperatures. when the temperatures get reduced below 400°F (204°C). Sb. Div. 2 Page 64 of 66 . That gives the possibility to repeat the hydrotest using the same pressure as indicated on the nameplate any time during the vessel operating lifetime.2.7.2 for more information. Pressure Vessels ASME Section VIII.4 Standard 0601.11. See ASTM E208 for more information.3 ABSA (the Registration Boiler Branch in Alberta) interpret the term “Design Pressure” as the local pressure in any point of the equipment that is equal with the sum between the MAWP and design static head to that point. Div. and API 938. The graphitization occurs when the steel is exposed long time at temperatures exceeding 800°F (427°C). At a stress level below this limit any crack tip will not propagate.2.2. Another embrittlement that affects carbon steels is due to graphitization of steel structure. at temperatures lower than MDMT.2.2. The temper embrittlement is also time related. 2 Number: 0601 Revision: 9 APPENDIX F – INTERPRETATIONS The paragraph numbers referenced in this Appendix refer to the relevant paragraph in the main body of this Standard or within the preceeding Appendices and provide interpretations where the letter INT are denoted in the left hand margin. ). The result shall be used to establish a toughness transition curve. This curve shall be used to determine the temperature at which the toughness is 40 ft-lb (T40).8.3. Perlite is a brittle structure and will facilitate crack propagation as SOHIC. Sometime they are used as micro alloying elements in order to condition mechanical properties. 5.7. Due to fabrication process steels with higher content of S and P will present a lamellar distributed structure (such as onion layers) cause by uneven segregation of perlite.7. This temperature will be used as MDMT as long as the equipment will not be exposed to Hydrogen Service. The intent is.1 for more information.7.b • • 5.6. The type of detectable defects can be three-dimensional or two-dimensional oriented perpendicular to magnetic field.2.3. The phenomenon is more relevant in thicker plates. 1 and Div.3. 3. Div. The requirement applies only for the plates used for pressure envelope. 3.4 The 18 specimens shall be divided in six groups of three specimens. Rev 9. The result shall be used to establish a toughness transition curve. the MDMT will be represented by the sum between T40 and the additional temperature excursion induced by hydrogen embrittlement. See references 3.b Manual UT examination provides the capability to detect three-dimensional and two-dimensional defects in the full penetration butt welds and “D” category welds but cannot properly be used to detect defects in fillet welds (attachment welds). APPENDIX B B.2. Perlite is a brittle structure and will facilitate crack propagation.5. Each group of specimens shall be impact tested at a specific temperature different from the other groups.c To limit the amount of S and P in order to avoid the defective steel structures generated by the presence of these two elements. Limit the Vanadium and Columbium content. SCC sometime associated with blistering. • To limit the amount of S and P in order to avoid the defective steel structures generated by the presence of these two elements. Pressure Vessels ASME Section VIII. the MDMT will be represented by the sum between T40 and the additional temperature excursion induced by hydrogen embrittlement. Page 65 of 66 B.6 5.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII.2.4 Standard 0601.1. Higher CE will increase the amount of brittle structures and the thickness of HAZ that will lead to a lower toughness. 2 Number: 0601 Revision: 9 5. Each group of specimens shall be impact tested at a specific temperature different from the other groups. This temperature will be used as MDMT as long as the equipment will not be exposed to Hydrogen Service.E. HIC. 5.1 for more information.2. See references 3.7. Limit the Carbon Equivalent (C.7.6. 2 . In the case of Hydrogen Service.5.3. Due to fabrication process heavy forgings with higher content of S and P will have and uneven segregation of perlite. their presence will also prevent the relaxation of residual stress at lower PWHT temperatures.12.2.5 MT examination can be performed to detect superficial defects within 3/16” depth measured from weld surface.3. 1 and Div. The 18 specimens shall be divided in six groups of three specimens. Consequently when these two elements are present the PWHT temperature shall be substantially increased.4. PT examination shall be performed to detect only superficial open defects included within weld deposits or heat affected zone (HAZ). As a side effect.2. In the case of Hydrogen Service. Div. 5. This curve shall be used to determine the temperature at which the toughness is 40 ft-lb (T40).5. 5.1. The acceptance of using ESW technique may be provided only after reviewing the welding procedure that has to incorporate the results of disbanding tests. It is requested for one PWHT cycle which is typically provided in fabrication process and also for 3 PWHT cycles that consider any shop and field repairs. These tests are mandatory because for this types of steels.e.2. Div. the weld build-ups and the welds between mechanically loaded attachments and pressure envelope (i.5.3. Consequently the steel structure shall be bainite. C.1.1 The flanges belonging to the piping system connecting these nozzles are not designed for allowable stress that is equal with the one specified for Div. Suncor does not accept using thicker plates due to increased probability of obtaining defects and the problems associated with the time required to repair these defects.2. The N&T heat treatment can not ensure a minimum 90% conversion of normalized structure into a bainitic one due to the improper cooling process during the Normalizing phase. Consequently this potential problem shall be avoided on thicker elements (associated with a higher design temperature and/or pressure).7 C. The PWHT temperature and the operating temperature induce a significant reduction of steel toughness.1 Even if the fabrication has the capacity of rolling thicker plates the concern is related with the quality (the frequency and size of defects) of longitudinal seams. Also it is recommended to restrict the width of welding consumable (strip) to maximum 5” (125 mm). In addition laboratory tests indicate that weld metal quality and structure is always lower that the one of base metal.12 The ESW technique may be used only if the fabricator proves that he got long experience in using it on similar equipments. 2 Number: 0601 Revision: 9 APPENDIX C C. 1 and Div. Div. This process shall not be accepted on combination of operating parameters exceeding 800°F (427°C) and 1500 psig (10.2.2.2.2. C. That is because this original toughness will get reduced during PWHT and in operation.8 C.4 C.335 kPag). Negligible loads are considered the ones that generate a local stress not exceeding 10% of the allowable limit. C.3 C. The DTH shall not be accepted on restrained welds such as the welds around the nozzles. The requirement asses the potential degradation of mechanical properties of original bainitic steel structure. 1 and Div. the PWHT temperature is always higher than Tempering temperature and consequently the microstructure is modified by PWHT cycle. 2 Page 66 of 66 . The requirement addresses the maximum range of toughness reduction that has to be used as reference when the Minimum Pressurization Temperature (MPT) is established.3. The weld overlay applied in a single layer technique can be accepted provided the weld overlay surface will not be embrittled as a result of PWHT. internal ring supports).11 The DHT shall be accepted only on not restrained welds such as longitudinal and circumferential butt welds on cylindrical shells and spherical heads.MAJOR PROJECTS Corporate Technical Standard Department: Subject: PROJECT SERVICES Pressure Vessels ASME Section VIII. The requirement asses the potential degradation of mechanical properties induced by embrittlement of steel structure. Rev 9. Pressure Vessels ASME Section VIII. Standard 0601. In Hydroprocessing equipment (such as reactors) the required toughness of new material shall as high as possible.2.8 C.