34-SAMSS-514

Materials System Specification34-SAMSS-514 Combustible Gas and Hydrogen Sulfide Monitors Instrumentation Standards Committee Members Al-Juaib, Mohammed Khalifah, Chairman Tuin, Rienk, Vice Chairman Al-Dakhil, Tareq Khalil Al-Faer Al Sharif, Hisham Mohammed Al-Harbi, Ahmed Saad Al-Jumah, Yousif Ahmed Al-Khalifa, Ali Hussain Al-Qaffas, Saleh Abdal Wahab Al-Sahan, Fawaz Adnan Al-Saleem, Hesham Salem Chetia, Manoj Ell, Steven Tal Fadley, Gary Lowell Falkenberg, Anton Raymond Grainger, John Francis Mahmood, Balal Mathew, Vinod Qarni, Mahdi Ali Trembley, Robert James 26 January 2009 Saudi Aramco DeskTop Standards Table of Contents 1 2 3 4 5 6 7 Scope............................................................. 2 Conflicts and Deviations................................. 2 References..................................................... 2 General Requirements................................... 3 Technical Requirements................................. 5 Performance Tests......................................... 8 Other Miscellaneous Requirements............... 9 Previous Issue: 6 September 2008 Next Planned Update: 26 January 2014 Revised paragraphs are indicated in the right margin Primary contact: Abeediah, Saeed Mohammad on 966-3-8752559 Copyright©Saudi Aramco 2009. All rights reserved. Page 1 of 10 3. who shall follow internal company procedure SAEP-302 and forward such requests to the Manager.Document Responsibility: Instrumentation Issue Date: 26 January 2009 Next Planned Update: 26 January 2014 34-SAMSS-514 Combustible Gas and Hydrogen Sulfide Monitors 1 Scope This specification defines the minimum mandatory requirements for stationary combustible gas and hydrogen sulfide detection and monitoring systems. Process & Control Systems Department of Saudi Aramco.1 Saudi Aramco References Saudi Aramco Engineering Procedure SAEP-302 Instructions for Obtaining a Waiver of a Mandatory Saudi Aramco Engineering Requirement Saudi Aramco Inspection Requirements Form 175-344900 Combustible Gas and Hydrogen Sulfide Monitors Saudi Aramco Forms and Data Sheets Form 8020-514-ENG Form NMR-7930 Instrument Specification Sheet . Dhahran. or industry standards. the purpose of which is to detect and warn of the presence of combustible gas and hydrogen sulfide gas in ambient air. codes. 2 Conflicts and Deviations 2. unless otherwise noted. Process & Control Systems Department of Saudi Aramco.Combustible Gas and Hydrogen Sulfide Monitors Nonmaterial Requirements Page 2 of 10 . 2.1 Any conflicts between this specification and other applicable Saudi Aramco Materials System Specifications (SAMSSs). Dhahran. and forms shall be resolved in writing by the Company or Buyer Representative through the Manager. Standard Drawings (SASDs). Engineering Standards (SAESs). Direct all requests to deviate from this specification in writing to the Company or Buyer Representative.2 3 References Material or equipment supplied to this specification shall comply with the latest edition of the references listed below. 01. the designer can take credit for forced or passive cooling to eliminate or reduce the 15°C heat rise. For example.2 Industry Codes and Standards International Society for Measurement and Control (Formerly Instrument Society of America) ANSI/ISA-12.13. if vortex coolers are 3) Page 3 of 10 . the equipment shall be designed for a maximum operating temperature of 65 + 15 = 80°C. or permanently fixed sunshades with a top and three sides.2.1998 ANSI/ISA-12.13. and may be followed by the equivalent value in English (conventional) units between brackets. the equipment must perform at 35 + 15 = 50°C.0. enclosures not included in the original manufacturer's temperature certification).2 Environmental Conditions 4.. an additional 15°C shall be added to the above maximum temperatures.g.2003 Performance Requirements for Combustible (IEC 617791 through 5 Mod) Gas Detectors ISA-92.1 Engineering Units All dimensions and measurements shall be in the “International System of Units” (SI). An example. for "indoor air conditioned" installation. For instruments which dissipate internal heat and are installed in custom engineered enclosures (e.04 Performance Requirements for Toxic Gas Detection Instruments: Hydrogen Sulfide Performance Requirements for Open Path Combustible Gas Detectors 4 General Requirements 4. For the outdoor installations only. ventilated enclosures or buildings.1 Temperature Instruments and control systems shall operate continuously under the following ambient air temperatures without any degradation of the manufacturer's guaranteed performance: Indoor Air (2) Conditioned 35°C (95°F) 10°C (50°F) Outdoor (1)(2)(3) Sheltered 55°C (131°F) 0°C (32°F) Outdoor (2)(3) Unsheltered 65°C (149°F) 0°C (32°F) Maximum Minimum Notes: 1) 2) "Sheltered" refers to permanent. When not critical. Part I . for the "outdoor unsheltered" case.Document Responsibility: Instrumentation Issue Date: 26 January 2009 Next Planned Update: 26 January 2014 34-SAMSS-514 Combustible Gas and Hydrogen Sulfide Monitors 3. Similarly. 4. the equivalent dimensions may be rounded off to their nearest practical value.01 . No more than 15°C reduction in temperature will be given as credit.2. magnesium. 4.2. Other pollutants present in the atmosphere under the extreme conditions are: H2S Hydrocarbon SO2 CO NOx O3 4. During sandstorms.Document Responsibility: Instrumentation Issue Date: 26 January 2009 Next Planned Update: 26 January 2014 34-SAMSS-514 Combustible Gas and Hydrogen Sulfide Monitors used.5 micrometers Elements present in dust include compounds of calcium.3 Humidity Indoor humidity design basis shall be 20% to 80% relative humidity. shall be protected against corrosion and operational failure due to wind-borne sea water spray and the accumulation of wetted salt (NaCl).2. aluminum.2 Contaminants The equipment manufacturer shall ensure that the equipment is designed to withstand the following air quality requirements: 4. potassium. silicon. The designer shall substantiate his claim by providing the support data and calculations. but is situated offshore or near shore (i.2. 4.2 20 ppm (vol/vol) 150 ppm (vol/vol) 10 ppm (vol/vol) 100 ppm (vol/vol) 5 ppm (vol/vol) 1 ppm (vol/vol) Wind-borne Sea Water Spray Equipment which is not enclosed or hermetically sealed. the heat removal capacity of the coolers may be subtracted from the generated heat. within 1 km from shoreline).. chlorides and sodium.2.2. When wetted (high humidity conditions) these compounds function as electrolytes and can result in severe corrosion. Particle sizes are as follows:   95% of all particles are less than 20 micrometers 50% of all particles are less than 1. Page 4 of 10 .1 Dust Concentration Usual airborne dust concentration is 1 mg/m³. dust concentrations may reach 500 mg/m³.e. and shall be marked accordingly.1 Sensors for combustible gas detection shall be catalytic beadtype diffusion detectors unless specified otherwise on Form 8020-514-ENG. Groups C and D or Zone 1. 1. The vendor shall provide a list of gases and substances which would desensitize or otherwise adversely affect the sensor.1.1 Sensors shall be certified for use in Class I.2 5.1. 5.1.1 Sensor 5. Sensors shall have an operating range of 0-100% LEL of the specified gas. shall be followed by the Vendor in formulating a quotation or supplying instruments. Div.1.1. 5. 5 Technical Requirements Technical requirements.1. Any effects on the sensor due to oxygen enriched or oxygen deficient atmospheres. if any.2 Catalytic Bead Combustible Gas Sensor 5. FM.1 General Requirements 5. Group IIA & IIB hazardous locations by UL.1. on sensors as a result of continuous operation at the environmental extremes listed in Paragraph 4. or European agencies testing to equivalent CENELEC standards.3 5. CSA.Document Responsibility: Instrumentation Issue Date: 26 January 2009 Next Planned Update: 26 January 2014 34-SAMSS-514 Combustible Gas and Hydrogen Sulfide Monitors Outdoor design basis shall be 5% to 95% relative humidity (noncondensing).1. infrared point and/or Page 5 of 10 .4 5.1. The vendor shall advise the Company or Buyer Representative of adverse effects. shown below.1. together with the Standards cited in the References and with specific information entered on the Instrument Specification Sheet Form 8020-514-ENG.2.1.1.2. shall also be addressed.2.1 When specified on Form 8020-514-ENG.2.1. Sensors shall be constructed of materials resistant to corrosive effects of any gases or vapors specified on Form 8020-514-ENG.3 Infrared Combustible Gas Sensor 5.2 5. 5.1.3. or high concentrations of the detected gas. 2 Sensors shall automatically check for and alarm fouled optics or blocked beam conditions.1. The following Page 6 of 10 5. Gas concentration shall be expressed as LEL-meter (percent LEL of the gas cloud multiplied by the portion of the beam occupied by the gas cloud in meters).3.1. Group IIA & IIB hazardous locations by UL. the vendor shall provide storage and turnover recommendations to the Company or Buyer Representative. Open path sensors shall determine gas concentration over the entire path length. Power shall be supplied by the control device to which the transmitter is connected.3 5.1.3.Document Responsibility: Instrumentation Issue Date: 26 January 2009 Next Planned Update: 26 January 2014 34-SAMSS-514 Combustible Gas and Hydrogen Sulfide Monitors open path sensors shall be provided.1. Div. FM. Sensors shall have an operating range of 0-100 ppm hydrogen sulfide in air.4. Fouled optics or beam blockage shall not cause a high gas concentration indication or alarm.1.1.3 5. 5.3 5. if required.1.2. and provide a linear output of 0-22 mA.4.4 5.1 Hydrogen sulfide detection systems shall employ stationary sensors of the solid state.6 5. Transmitters and housings shall be certified for use in Class I.3. Infrared beam alignment tools.3. For sensors or sensor components which have a finite shelf life.4. shall be provided. Point sensors shall have an operating range of 0-100% LEL of the specified gas. minimum range. Sensors shall be immune from interference due to adverse weather conditions.1 5. diffusion adsorption-type as indicated on Form 8020-514-ENG. or European agencies testing to equivalent CENELEC standards.2 5. 5.1. 1.2. 5.2.2 Transmitter 5.4 Hydrogen Sulfide Sensor 5. CSA.2 The transmitter shall be housed with the sensor in a common housing.1. Loop voltage shall be 24 VDC nominal. Groups C and D or Zone 1.4 .2. Transmitters shall incorporate calibration and fault diagnostic features. and shall be marked accordingly.5 5.3. and shielding.10 Zero and span adjustments shall be non-interactive. or 0-100 ppm hydrogen sulfide. or random adjustments.2.8 (<4 mA) (<4 mA) (4-20 mA) (>20 mA) The 4-20 mA output shall correspond to 0-100% LEL combustible gas. Calibration shall require a key or tool in order to prevent accidental.3. double-throw (SPDT) Page 7 of 10 5. unintentional. 5.3 5. may be performed without opening the sensor/transmitter housing or declassifying the hazardous area.3 Control Unit 5.2. Power supply to the detector shall be 24 VDC.5 . shall be provided at the transmitter. in addition to the required number of channels specified on Form 8020-514-ENG shall be provided.3. 5.4 5. 60 Hz. Twenty percent spare rack capacity (slots).9 5.11 The vendor shall specify transmitter wiring requirements.3. i.7 5.2. Calibration shall be nonintrusive. Power for the control unit chassis shall be 120 VAC.or cabinet-mounted system of single-channel control modules. Indication of operational status. Calibration shall require only one person.3. in air. linear analog or digital indicator for calibration.Document Responsibility: Instrumentation Issue Date: 26 January 2009 Next Planned Update: 26 January 2014 34-SAMSS-514 Combustible Gas and Hydrogen Sulfide Monitors information shall be represented by the signal range: Detector trouble/open loop Calibration mode/bypass Analog output signal Signal overrange 5.3. Transmitters shall incorporate an integral. maximum length.e. size. including calibration mode and fault conditions. Blank faceplates shall cover these spare slots.2.1 5.5 5. 5. Each control module shall have two single-pole.2. such that failure of a single module does not disable the detection system.2. when specified.. Control units incorporating integral power supply modules for logic and loop power shall have redundant modules. including cable type.2.6 5.2 The control unit. shall be a rack. 3.4 5. The vendor shall set the critical alarm setpoint to the value specified on Form 8020-514-ENG.5. The setpoint shall be adjustable. This alarm shall indicate sensor. or in parts-per-million (ppm) for hydrogen sulfide.1. or wiring faults or power failure. 5. The critical (high-high) alarm shall de-energize to alarm and be latching.1 5.1 Accuracy 6.3. preferably LEDs. transmitter. The setpoint shall be adjustable. and one SPDT fault relay. high alarm and fault indication. in percent LEL for combustible gas. Indicating lamps. noninductive. high-high alarm.7 6 Performance Tests 6. shall be provided on the front of each control module for power. A manual reset pushbutton shall be provided on the module to reset the alarm after the gas concentration falls below setpoint.3. 6. The warning (high) alarm shall de-energize to alarm and shall be latching or non-latching as specified on Form 8020-514-ENG. The fault alarm shall be normally energized and shall deenergize to alarm.3.2 Minimum relay contact rating shall be 0. The vendor shall set the warning alarm setpoint to the value specified on Form 8020-514-ENG. whichever is greater. 5. A latching alarm shall be reset by the same pushbutton described in Paragraph 5.3.5. 5.3.5 A at 120 VAC.2.3.1. The minimum accuracy for hydrogen sulfide monitors shall be ± 2 ppm concentration or ± 10% of the applied test gas concentration.2 Page 8 of 10 .1 The minimum accuracy for combustible gas monitors shall be ± 3% of full-scale gas concentration or ± 10% of the applied test gas concentration. whichever is greater. control unit.6 An analog or digital indication of concentration.5. shall be provided on each module.Document Responsibility: Instrumentation Issue Date: 26 January 2009 Next Planned Update: 26 January 2014 34-SAMSS-514 Combustible Gas and Hydrogen Sulfide Monitors relays to provide critical and warning alarm outputs.5.5.3 5. 6.3 7. for hydrogen sulfide monitoring instruments.2 7.3. Section 3.2. “Markings on Instrument. FM.13. Section 3. Section 3.3 7 Other Miscellaneous Requirements 7.1. The vendor shall provide the applicable installation and operation manual listed in ANSI/ISA-12.2.13.13.1. Part I for all hydrogen sulfide monitor specified on Form 8020-514-ENG.01. “Manufacturer’s Installation and Operation Manual” for open path combustible gas monitors.0.01. 7.2. Section 6.13.1 Combustible gas monitoring instruments shall be marked by the vendor in accordance with ANSI/ISA-12.1 The vendor shall provide the applicable instructions and data listed in ANSI/ISA-12. or CSA) certificate of full compliance to ISA-92.1.13.0.04 for all infrared open path combustible gas monitor specified on Form 8020-514-ENG.2 Type Testing 6.13. The vendor shall provide a third party (UL.01.3 Inspection Items manufactured to this specification for combustible gas and hydrogen Page 9 of 10 . The vendor shall provide a third party (UL.01 for all combustible gas monitor specified on Form 8020-514-ENG.2.1. FM.2 7.2. “Instruction Manual”. Operation and Maintenance 7.04. FM.2 6.” Open path combustible gas monitors shall be marked by the vendor in accordance with ANSI/ISA-12.2 Installation.0.01. Part I.3. Part I.2. or CSA) certificate of full compliance to ANSI/ISA-12.” Hydrogen sulfide monitoring instruments shall be marked by the vendor in accordance with ISA-92.Document Responsibility: Instrumentation Issue Date: 26 January 2009 Next Planned Update: 26 January 2014 34-SAMSS-514 Combustible Gas and Hydrogen Sulfide Monitors 6. “Instruction Manual”.1 The vendor shall provide a third party (UL. “Markings. Section 3. or CSA) certificate of full compliance to ANSI/ISA-12. “Labeling and Marking.1 Marking 7.04. for combustible gas monitoring instruments.01. The vendor shall provide the applicable instructions and data listed in ISA-92.3 7.” 7. Section 6.4.2.2. 26 January 2009 Revision Summary Revised the "Next Planned Update. Page 10 of 10 . Reaffirmed the contents of the document.Document Responsibility: Instrumentation Issue Date: 26 January 2009 Next Planned Update: 26 January 2014 34-SAMSS-514 Combustible Gas and Hydrogen Sulfide Monitors sulfide monitors are subject to the minimum Inspection requirements as specified in Saudi Aramco Inspection Requirements Form 175-344900. and reissued with minor changes.4 Nonmaterial Requirements The supplier shall provide nonmaterial items as shown on Form NMR-7930. 7.