Building Services - HVAC- Specification

20.BUILDING SERVICES Thai Binh 2 Thermal Power Plant 20.2.1 Air Conditioning and Mechanical Ventilation 20.2.1.1 General This specification covers the detailed design, supply, and delivery to site, installation, testing, commissioning and acceptance testing of the air conditioning and mechanical ventilation system. The Contractor shall furnish labor, materials, equipment, certificates, drawings, temporary work and carry out design, engineering, supply, manufacture, erection, installation, inspection, testing, commissioning to complete the work. 20.2.1.2 Scope of Work The work covered under this specification shall include the complete air-conditioning and mechanical ventilation (ACMV) systems for buildings/areas, as well as details, accessories, electrical and other associated services required for the complete installation to operate safely, reliably and properly. Equipment and/or accessories not specifically mentioned in this Specification, but which are necessary for a safe, reliable and proper operation of the ACMV system, shall be deemed to be included in the package. The scope of work shall include but not be limited to the following:  Detailed design of ACMV systems for buildings, including cooling load calculating by E-20-II software or other approved software, cooling load calculation shall be meet current Ashrae standard if it is achieved by calculation sheets, ACMV equipment sizing, pipe sizing calculations, duct sizing, ductwork pressure loss calculations, electrical voltage drop calculations, cable sizing calculations, isometric drawings, pipe support design, pipe stress analysis and design report.  Supply and installation of ACMV equipment inclusive of air cooled chillers, chilled water pumps, air cooled roof top package units, air handling units, air cooled split condensing units, direct-expansion air handling units, supply ventilation fans and extract ventilation fans.  Supply and installation of chilled water distribution system inclusive of pipes, pipe fittings, valves, and pipe supports, expansion tanks and piping instrumentation.  Supply and installation of thermal insulation to chilled water distribution systems inclusive of vapor barrier and pipe cladding.  Supply, installation of air distribution system inclusive of ductwork, duct fittings, balancing dampers, fire dampers, volume control dampers, air grilles and diffusers, fresh air louvers, split dampers, duct support and duct instrumentation.  Supply and installation of thermal insulation to air distribution system inclusive of vapor barrier.  Supply and installation of acoustic duct lining, vibration isolation to rotating equipment, sound attenuators and other acoustic measures.  Supply and installation of electrical power distribution system to ACMV equipment inclusive of starter panels, motor control centers, cabling and wiring, conduit, trunking and cable support system for the ACMV System unit’s electrical and instrumentation control loads. 20 - 1/55 299003401.doc 20. BUILDING SERVICES Thai Binh 2 Thermal Power Plant  Electrical and structural earthing of the entire ACMV System.  Supply and installation of instrument and control equipment inclusive of building local control panel, distributed control system, intelligent outstations, control valves, field devices, sensors and transmitters, gauges and flow meter.  Water and air balancing of ACMV system.  Testing and commissioning of the ACMV system inclusive of ductwork air pressure test, hydraulic pressure test for piping installation, loop test, polarity test, meggar test for cabling system and function test of control system.  Cleaning and flushing of the completed water distribution system.  Submission of shop drawings, as-built drawings, method statements, installation procedures, material specification, catalogues and datasheets, samples, quality control procedures, health, safety and environment procedures and work procedures.  Engage a Professional Engineer to carry out the following ACMV work: - Design in detail - Endorse on calculations, drawings and certificates - Submission to local authorities and to obtain approval/clearance for the ACMV system  The Contractor shall furnish documentation including provision of full warranty for defects arising during the defects liability period.  The Contractor shall provide submission drawings in electronic format (AutoCAD and PDF) as well as hard copy for submission to local authorities.  The Contractor shall provide AutoCAD native files as well as in PDF format for drawing submissions for review and approval. This shall include but not limited to shop drawings, authorities submission drawings and as-built drawings.  The Contractor shall provide “As-Built” drawings and two electronic copies of the drawings (one in AutoCAD format, one in pdf format) after completion of work.  Submission of Operation & Maintenance Manual, both hard-copy and electronic copy in pdf format.  Supply and delivery of spare parts.  Training of Operating staff. 20.2.1.3 Codes, Standards, Specifications and Regulatory Requirements The ACMV System shall be provided in accordance with the following local / international codes and standards:  TCVN 4088- 1985 Climatic data in construction design Standard, design requirements are applied with following standards:  TCVN 5687 -1992 Air ventilation, conditioning and heating design standard 20 - 2/55 299003401.doc 20. BUILDING SERVICES Thai Binh 2 Thermal Power Plant  TCVN 5938 - 1995 Air quality. Maximum permissible concentration of some toxic matters in surrounding environment.  TCVN 5940 -1995 Air quality. Industrial waste air for organic matters.  TCVN 4605 - 1988 Thermal technical. Enclosure structure. Technical standard.  TCVN 5945 -1995 Industrial waste water. Waste standard  TCXD 188 - 1996 urban waste water. Waste standard.  TCXD 232 - 1999 Air ventilation, conditioning and cooling system. Fabrication, installation and taking over.  TCVN 2622 - 1995 Fire fighting and protection for house and work. Standards and regulations for commissioning mode  TCVN. 3993 - 1985 Anti-corrosion in construction International standards and codes  NFPA 90A Installation of air conditioning and ventilation system  ASHRAE 70 Methods of testing for rating the air flow performance of outlet and inlets  ASHRAE Standard 62 Ventilation for Acceptable Indoor Air Quality The codes, standards and specifications referenced in the Specification shall include addenda and amendments and shall govern in all cases where references to them are made. The precedence applying for use of the Codes, Standards, Specifications and Regulatory requirements for this project is as follows:  Regulatory requirements  Project specific requirements  Vietnam standards  International standards The Contractor shall comply with rules and regulations of Vietnam and any other International Standards and Codes of Practice relevant to the type of system in similar Power Plants. In case of any conflict between these codes and standards and the Specification, the more stringent standard shall prevail to the extent of such difference. 20.2.2 Design Requirements 20.2.2.1 General Air conditioning or mechanical ventilation shall be provided within the areas/rooms to prevent the accumulation of stale air and the build up of dangerous fumes, to reduce the temperature rise caused by items of electrical equipment and to maintain a comfortable environment for working. 20 - 3/55 299003401.doc 20. BUILDING SERVICES Thai Binh 2 Thermal Power Plant 20.2.2.2 Design Services The Contractor shall perform design functions necessary for the development, procurement, installation, testing and commissioning of the ACMV system and components to provide a complete and safe ACMV system. Design functions shall include but not be limited to the following:  Cooling load calculation using computer software such as E20-II, Trace 700 or equivalent, cooling load calculation sheets shall be meet current Ashrae standard.  Building material U-value calculation.  Equipment sizing. 10% safety margin shall be allowed for in equipment sizing.  Pipe stress analysis to verify adequacy of piping design.  Hydraulic calculation of pipe sizing, flow rates and pressure drop calculation for pump sizing.  Fan static pressure loss calculation.  Voltage drop and cable sizing calculation.  Preparation of drawings which clearly illustrate the system concept of chilled water distribution system, air distribution system, refrigerant piping system, electrical power and control system. Drawings shall include floor layout plans, schematic flow diagrams, process flow diagrams, process and instrument (P&I) diagrams, single line diagram, control logic diagram and system architecture drawing.  Preparation of piping general arrangement drawings and piping isometric drawings.  Preparation of detail duct routing general arrangement.  Preparation of electrical and control cable routing plans.  Preparation of construction details shop drawings which clearly illustrate pipe fabrication details, pipe support details, duct fabrication details, cable termination details and construction/installation details.  Submission to local Authorities and obtaining their approval.  Supervise the installation work and certify fitness of use upon completion of ACMV work.  Toilet, kitchen, battery room and laboratory shall have a slight negative pressure.  Each air-handling unit and exhaust fan shall be interlocked with and shut down by the appertaining smoke detectors, via fire alarm panel. Unless otherwise specified, equipment and materials within the scope of this Specification shall be of a standard proven design. Designs incorporating components which may be considered prototype will not be accepted. Equipment and components shall be designed and supported to permit free expansion and contraction without causing leakage, excessive strain and distortion. 20.2.2.3 Design Criteria Air conditioning, mechanical ventilation and natural ventilation shall be provided in accordance with the following table: 20 - 4/55 299003401.doc 20. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Building Name Air Conditioning Mechanical Ventilation Natural Ventilation   1 Turbine-generator House 2 Boiler House 3 Central Control House   4 Administration Building   5 Common Service House   6 Reception house at main gate   7 Switchyard Control House   8 CHP Control House   9 ESP House   10 Fuel Oil Pumping Equipment   11 Diesel Generator House   12 Hydrogen Generation Plant   13 Water House   14 Chlorination Plant   15 Return Water Pump House   16 Bulldozer Garage  17 Mechanical Warehouse 18  Treatment System   Cooling Water Pump House   19 H.F.O Unloading Jetty   20 Limestone Storage and Milling   21 Maintenance Workshop   22 International and Consultant Office   23 Electrical and I&C warehouse   24 Coal Milling Station 25 Other House 20.2.2.4 Auxiliary Equipment Local    Equipment  External Design Criteria The ACMV system shall be designed based on the following external conditions: Outdoor design ambient conditions: 38°C DB maximum air temperature 37°C WB with 93% max. monthly avg. relative humidity 20 - 5/55 299003401.doc 20. Relative Humidity/ % Dry Bulb Temp0C Noise Criteria (NC) Working Room 13 555% 2310C 45 Redundancy Administration Building Ground Floor Duty & Room 1st Story 2nd Story 3RD Story Service 0 1 555% 231 C 45 Guest Room 1 555% 2310C 45 Operator Room 2 555% 2310C 45 0 Document Room 1 555% 231 C 45 Storage Room 1 555% 2310C 50 0 Health Room 1 555% 231 C 45 Store Room 1 555% 2310C 50 Working Room 16 555% 2310C 45 0 Meeting Room 2 555% 231 C 45 Guest Room 1 555% 2310C 45 0 Secretary Room 1 555% 231 C 45 Director Room 1 555% 2310C 45 Vice Director Room 3 555% 2310C 45 Director Room 1 555% 2310C 45 Working Room 23 555% 2310C 45 Meeting Room 1 555% 2310C 45 Working Room 21 555% 2310C 45 Small Room 1 555% 2310C 45 2 555% 2310C 45 Meeting Meeting Library 0 Traditional Room 1 555% 231 C 45 Hall 1 555% 2310C 45 Hall Hall Central Control 20 .5 Internal Design Criteria Air Conditioning System Air-conditioned areas shall be designed to maintain the following internal conditions with appropriate duty and standby provision: Indoor Condition Building/Level Room No.2. BUILDING SERVICES Thai Binh 2 Thermal Power Plant 20.2.doc .6/55 299003401. 7/55 299003401.doc . BUILDING SERVICES Thai Binh 2 Thermal Power Plant Indoor Condition Building/Level Dry Bulb Temp0C Noise Criteria (NC) Redundancy 555% 2310C 45 N+1 555% 2310C 50 N+1 555% 2310C 50 N+1 Breaker & LV Distribution Room 555% 2810C 50 N+1 Marshalling Room 555% 2810C 45 N+1 Main Room 555% 2310C 45 N+1 System & Test Developing Room 555% 2310C 50 N+1 Computer Room 555% 2310C 45 N+1 Relative Humidity/ % Laboratory HP Room Distribution AC Room Distribution Room No. Building Ground Floor 3rd Floor 4th Floor Control Shift-handling Room 555% 231 C 45 N+1 SCADA Room 555% 2310C 50 N+1 Control Cubicle 555% 2310C 45 N+1 0 0 Working Room 1 555% 231 C 45 N+1 Working Room 2 555% 2310C 45 N+1 Document & General Storage 555% 231 C 45 N+1 Communication Room 555% 2310C 50 N+1 Dining Room 555% 2310C 45 N+1 Meeting Room 555% 2310C 45 N+1 0 0 Working Room 3 555% 231 C 45 N+1 Working Room 4 555% 2310C 45 N+1 Warehouse 555% 2310C 50 N+1 Dining Room 555% 2310C 45 N+1 Relay Room 555% 2310C 50 N+1 Electrical and I&C Warehouse Common House Service Switchyard Control House Ground Floor 20 .20. 0 Duty Room 555% 231 C 45 Communication Room 555% 2310C 45 N+1 Working Room 555% 2310C 45 - Meeting Room 555% 2310C 45 - Small Room 555% 2310C 45 - 555% 2810C 50 Working CHP Control House Electrical Room Control Room 555% Control Cubicle and Equipment Room 555% Guest Room 555% Shift Handling Over House 0 231 C 45 N+1 45 N+1 2310C 45 - 555% 2310C 45 - Security Reception Room 555% 2310C 45 - Office 555% 2310C 45 - Electrical Room 555% 2810C 50 N+1 Control Room 555% 2310C 45 N+1 Control Room 555% 2310C 45 N+1 Control Room 555% 2310C 45 N+1 Control Room 555% 2310C 45 N+1 2810C Reception House at Main Gate International and Local Consultant Office ESP Control House Fuel Oil House Diesel House Pumping Equipment Hydrogen House Water House Treatment 20 . BUILDING SERVICES Thai Binh 2 Thermal Power Plant Indoor Condition Building/Level 2ND Floor Dry Bulb Temp0C Noise Criteria (NC) Redundancy 555% 2310C 45 N+1 555% 2310C 50 N+1 Relative Humidity/ % Control Room DC Room Room No.20.doc .8/55 299003401. 9/55 299003401.doc .F.O.20. 0 Redundancy N+1 Office 555% 231 C 45 Laboratory 555% 2310C 45 N+1 Control & Electrical Room 555% 2310C 45 N+1 Rest Room 555% 2310C 50 MCC Room 555% 2310C 45 N+1 Office 555% 2310C 45 N+1 Office 555% 2310C 45 N+1 Electrical Room 555% 2810C 50 N+1 Control Room 555% 2310C 50 N+1 Rest Room 555% 2310C 50 Control Room 555% 2310C 50 N+1 Electrical Equipment Room 555% 2810C 50 N+1 C&I Room 555% 2310C 50 N+1 Welding Equipment Room 555% 2310C 50 Laboratory 555% 2310C 45 Chlorine House Return Water Pump House Bulldozer Garage Mechanical Equipment Warehouse Cooling Water Pump House H. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Indoor Condition Building/Level Relative Humidity/ % Dry Bulb Temp0C Noise Criteria (NC) Electrical House 555% 2810C 50 Control Room 555% 2310C 45 Room No. Jetty Unloading Limestone storage and milling Maintenance Workshop 0 Meeting Room 555% 231 C 45 Electric Technician Room 555% 2310C 50 20 . 6 Internal Design Criteria for Mechanical Ventilation System The mechanical ventilated space shall be designed to maintain the following internal condition with appropriate redundancy provisions: Room Air Change per Hour Noise (NC) HVAC Room Minimum 6 or to be calculated by heat load calculation to main room temperature not more than 40°C or not more than +5°C above ambient temperature whichever higher. 20. 0 Storage Room 555% 231 C 50 Locker 555% 2310C 50 Laboratory 555% 2310C 50 Redundancy Turbine Building N+1 Note: N+1 means a HVAC system in which N units have at least one independent backup component to ensure system functionality continues in the event of a system failure. and should continue to function at acceptable performance levels after the loss of any component. the overall system integrity should not be impacted by the failure of any one component. 50 Toilet 12 50 (N+1).10/55 299003401.2. 50 Toilet 12 50 Building/ Level Criteria Remarks Administration Building Ground Floor 3Rrd Story N+1 Central Control 20 . To be at a level of N+1. 1st Story Toilet 12 50 (N+1) 2nd Story Toilet 12 50 N+1 HVAC Room Minimum 6 or to be calculated by heat load calculation to main room temperature not more than 40°C or not more than +5°C above ambient temperature whichever higher.doc .20. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Indoor Condition Building/Level Relative Humidity/ % Dry Bulb Temp0C Noise Criteria (NC) Electrical Equipment Room 555% 2310C 50 Manager Room 555% 2310C 45 Room No.2. 11/55 299003401. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Building/ Level Room Air Change per Hour Noise (NC) Criteria Toilet 12 50 Battery Room Minimum 12 or to be calculated by heat load calculation to main room temperature not more than 40°C or not more than +5°C above ambient temperature whichever higher.doc . 50 Toilet 12 50 Antechamber - Toilet 12 50 Mechanical Room 12 50 Kitchen 20 60 Women Toilet 12 50 Man Toilet 12 50 Man Room 12 50 Woman Changing Room 12 50 Man Bath Room 12 50 Woman Room 12 50 Battery Room Minimum 12 or to be calculated by heat load calculation to main room temperature not more than 40°C or not more than +5°C above ambient temperature whichever higher. 50 Toilet 12 50 Remarks House Ground Floor 2nd Floor 4th Floor N+1 Natural Ventilated Common Service House Changing Bath N+1 N+1 Switchyard Control House Ground Floor N+1 20 .20. 60 N+1 Cable-room Minimum 12 or to be calculated by heat load calculation to main room temperature not more than 40°C or not more than +5°C above ambient temperature whichever higher. 60 N+1 HVAC Room Minimum 6 or to be calculated by heat load calculation to main room temperature not more than 40°C or not more than +5°C above ambient temperature whichever higher. 50 N+1 Remarks International and Local Consultant Office Electrical and I&C Warehouse Coal Station Milling Fuel Oil Pump House 20 . BUILDING SERVICES Thai Binh 2 Thermal Power Plant Building/ Level Room Air Change per Hour Noise (NC) Criteria 2ND Floor Toilet 12 50 Toilet 12 50 Toilet 12 50 Coal Milling House 6 50 N+1 Maintenance Area Minimum 12 or to be calculated by heat load calculation to main room temperature not more than 40°C or not more than +5°C above ambient temperature whichever higher.doc .12/55 299003401.20. 50 Electrical Equipment Room Minimum 12 or to be calculated by heat load calculation to main room temperature not more than 40°C or not more than +5°C above ambient temperature whichever higher. 50 N+1 Toilet 12 50 Toilet 12 50 Chemical Room Minimum 12 or to be calculated by heat load calculation to be not more than +5°C above ambient temperature whichever higher..13/55 299003401.20. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Reception House at Main Gate Toilet 6 50 Toilet 12 50 Mechanical Equipment Warehouse Storage Area Natural Ventilated Toilet 12 50 Hydrogen House Minimum 12 or to be calculated by heat load calculation to main room temperature not more than 40°C or not more than +5°C above ambient temperature whichever higher. 50 N+1 Rectifier Room Minimum 12 or to be calculated by heat load calculation to main room temperature not more than 40°C or not more than +5°C above ambient temperature whichever higher. 50 Maintenance area 12 50 Equipment Storage Minimum 6 or to be calculated by heat load calculation to main room temperature not more than 40°C or not more than +5°C above ambient temperature whichever higher. 50 Hydrogen House CHP House Plant Control Return Water Pump House H.doc .F..O Unloading Jetty N+1 20 . 50 Pump house area Minimum 12 or to be calculated by heat load calculation to be not more than +5°C above ambient temperature whichever higher.doc . 60 Turbine House To be calculated by heat load calculation to be not more than +5°C above ambient temperature whichever higher. 50 Ash Slurry Pump House Minimum 12 or to be calculated by heat load calculation to be not more than +5°C above ambient temperature whichever higher.20. 60 Deaerator House - Coal House - N+1 and Cooling Water Pump House Fire House Pump Diesel Generator Room Generator Ash Slurry Pump House Turbinegenerator House Bunker N+1 Natural Ventilated Natural Ventilated Maintenance Workshop Fabricating Minimum 12 or to be calculated by 60 N+1 20 .14/55 299003401. 60 Fire Pump House Minimum 12 or to be calculated by heat load calculation to be not more than +5°C above ambient temperature whichever higher. 60 Diesel Room Minimum 12 or to be calculated by heat load calculation to be not more than +5°C above ambient temperature whichever higher. 50 Limestone storage area Minimum 16 or to be calculated by heat load calculation to be not more than +5°C above ambient temperature whichever higher. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Limestone Storage Milling Pump Room Minimum 12 or to be calculated by heat load calculation to main room temperature not more than 40°C or not more than +5°C above ambient temperature whichever higher. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Machine Room heat load calculation to be not more than +5°C above ambient temperature whichever higher. electrical equipment shall be considered in the cooling load calculation. office equipment. equipment noise levels shall not exceed 85 dB(A) at a distance of one meter from the equipment. Indoor air quality shall be in accordance with Vietnam standards. Internal heat gain from occupant. 20 .9 Noise Limits In general. electrical room and key areas. power cubicle room. Laboratory shall be provided with 100% fresh air. 20. and should continue to function at acceptable performance levels after the loss of any component.2.2. Duty and standby units shall be provided for the room with important equipment such as control room. control cubicle. 20. Toilet 12 50 Note: N+1 means a ventilation system in which N units have at least one independent backup component to ensure system functionality continues in the event of a system failure. To be at a level of N+1.20. Background noise generated from ACMV equipment. The far-field noise level shall be designed to meet 60 dB (A) at the project property boundary. pressurized as necessary to prevent the ingress of dust.doc . lighting. Fresh air supply ventilation shall be designed to ensure that the indoor environment is positively pressurized to prevent the infiltration of dust laden outside air.2.15/55 299003401. Noise levels shall be measured in accordance with appropriate ISO Standards.2.2. 20. For those areas where internal heat gain is not available. 30 W/m2 shall be allowed for miscellaneous equipment load.2. air grilles and ductwork shall not exceed the value as specified in the internal design criteria. the overall system integrity should not be impacted by the failure of any one component.8 General Requirement Standardization of the major items of equipment and their constituent components is required where practicable. The extract fans shall be suitably protected against the corrosive marine environment and located so ease of maintenance is achieved. Mechanical ventilation shall be provided where necessary to remove heat gains from equipment or hazardous fumes. Refrigerants supplied with all equipment shall be 'ozone friendly' refrigerants as approved by the Montreal Protocol.7 Areas shall be positively Fresh Air and Internal Load Fresh air to air conditioned space shall be provided based on 8 liters/s/person. 3.3.doc . Air constant air volume chilled water precision air conditioning units with appropriate duty and standby redundancy shall be provided for main control room and control cubicle room. Chilled water pipes shall be arranged in single primary loop manner with gravity feed and expansion tank located at 1. 1 standby) with matching chilled water pumps (2 duty.20. Ducted return shall be used and fresh air shall be connected at the return plenum before the air filter. BUILDING SERVICES Thai Binh 2 Thermal Power Plant 20. Proper zoning shall be designed and each zone shall be equipped with electric duct re-heater for part- 20 .2. Digital thermostat with manual adjustable set point shall be provided in air condition space for control purposes.2 Central Control Building Three numbers of air cooled chillers (2 duty. 1 standby) shall be provided at the roof to distribute chilled water to various air-side equipment for air conditioning purposes. Ducted return shall be used and fresh air shall be connected at the return plenum before the air filter.16/55 299003401.3 SYSTEM DESCRIPTION 20. Toilet exhaust shall be ducted to the roof for centralize exhaust.5 m above the highest water side equipment to prevent air lock.2.5 m above the highest water side equipment to prevent air lock. Digital thermostat with manual adjustable set point shall be provided in air condition space for control purposes. For HVAC rooms.1 Administration Building Three air cooled chillers (2 duty.2. Proper zoning shall be designed and each zone shall be equipped with electric duct re-heater for part-load space temperature control. Modulating control valves shall be provided at cooling coils for proper control of space air temperature or supply air temperature as required. Air constant air volume air handling units with appropriate duty and standby redundancy shall be provided at each HVAC room. N (N duty without redundancy) unit exhaust fan and ducted supply fan c/w supply grilles shall be provided. Air constant air volume air handling units with appropriate duty and standby redundancy shall be provided at each HVAC room. 1 standby) shall be provided at the roof to distribute chilled water to various air-side equipments for air conditioning purposes. Duty and standby toilet exhaust fan shall be provided. Proper zoning shall be designed and each zone shall be equipped with electric duct re-heater for part-load space temperature control. 1 standby) with matching chilled water pumps (2 duty. Laboratory shall be equipped with its own duty and standby air handling units using 100% fresh air. Air filter shall be provided upstream of the cooling coil to provide 95% up to 5 micro filtration efficiency. 20. Chilled water pipes shall be arranged in single primary loop manner with gravity feed and expansion tank located at 1. Digital thermostat with manual adjustable set point shall be provided in air condition space for control. Air filter shall be provided upstream of the cooling coil to provide 95% up to 5 micro filtration efficiency. Modulating control valves shall be provided at cooling coils for proper control of space air temperature or supply air temperature as required. 4 Switchyard Control House Duty and standby localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the Control room. 20.2. male shower room. Toilet exhaust shall be ducted to the roof for centralize exhaust. Localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the working rooms. Fresh air shall be filtered and taken from side of the room. Fans and equipments shall be explosion proof. male toilet and female toilet respectively. Localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the electrical equipment room. Digital thermostat with manual adjustable set point shall be provided in laboratory for control purposes. Indoor units shall be ceiling cassette type c/w fresh air intake kit. Constant air volume air valve shall be provided at each fume cupboard connection.3. Fans and equipments shall be explosion proof. 20. Ducted mechanical ventilation system shall be provided for toilet.5 CHP Control House Duty and standby units localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the control room and control equipment room respectively. communication room and AC/DC room respectively. Laboratory exhaust via fume cupboards and air grilles shall be ducted to the roof for air discharge. Make up air shall be through the door louver.2. 20. the intake air shall be transferred from dining room.20. Indoor unit shall be wall mounted type. 20 . relay room.3. Kitchen exhaust shall be ducted to the roof by exhaust fan.17/55 299003401. female shower room.doc .2. male locker room. Battery room shall be equipped with its own duty and standby mechanical ventilation system. Ducted mechanical ventilation system shall be provided to HVAC rooms and cable room respectively. meeting room and working reception room respectively. BUILDING SERVICES Thai Binh 2 Thermal Power Plant load space temperature control. Duty and standby toilet exhaust fan shall be provided. Grease intercepting filters shall be provided at kitchen exhaust air grilles. Exhaust duct shall be of stainless steel grade 314.3 Common Service House Localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the dining room and other space require air conditioning. Ducted exhaust shall be provided for the toilet. Exhaust shall be at high level and make up air at low level. Supply and exhaust ducts installed shall be made of stainless steel grade 314. Duty and standby laboratory exhaust fan shall be provided. Duty and standby exhaust fan shall be provided. Exhaust duct of the battery room shall be made of stainless steel grade 314 and shall be ducted to the roof for air discharge. Battery room shall be equipped with its own duty and standby mechanical ventilation system. female locker room. Intake air shall be filtered and taken from side of the room.3. For kitchen. Grease filters media to be woven aluminum with expanded metal cover on both sides. Ducted mechanical ventilation system shall be provided to toilet. Ducted exhaust shall be provided for the toilet. Indoor unit shall be wall mounted type.9 Car Garage Localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the driver’s room.2.18/55 299003401. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Indoor unit shall be wall mounted type. Ducted mechanical ventilation system shall be provided to toilet.2. Mechanical ventilation system shall be provided for diesel generator room. 20. The indoor unit shall be wall mounted type.7 ESP Control House Duty and standby localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the Control room. The indoor unit shall be wall mounted type. Exhaust shall be at high level and make up air at low level.2. Fans and equipments shall be explosion proof. Intake air shall be filtered and taken from side of the room.doc . Indoor unit shall be wall mounted type.3.8 Fuel Oil Pumping House Duty and standby localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the MCC room. Indoor unit shall be wall mounted type. 20. 20 . Make up air shall be through the door louver.3. Localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the electrical equipment room. 20. 20.6 Reception House at Main Gate Localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the bedroom.2. Indoor unit shall be wall mounted type.20.10 Diesel Generator House Duty and standby localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the Control and Electrical room.3. Ducted mechanical ventilation system shall be provided toilet and changing room respectively. general office and waiting room respectively. Supply and exhaust ducts installed shall be made of stainless steel grade 314.3.3.2.11 Hydrogen Generation Plant Duty and standby localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the Control room. Ducted exhaust shall be provided for the toilet. 20. Make up air shall be through the door louver.2.3. Rectifier room and hydrogen plant house shall be equipped with its own duty and standby mechanical ventilation system. 20. Make up air shall be through the weatherproof louver c/w insect screen and filter with dust spot 65% efficiency and approved by BS 6540.O Unloading Jetty Duty and standby localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the Control room and rest respectively. Indoor unit shall be wall mounted type. Mechanical ventilation system shall be provided for toilet. 20. Laboratory exhaust via fume cupboards and air grilles shall be ducted to the roof for air discharge. Make up air shall be through the weatherproof louver c/w insect screen and filter with dust spot 65% efficiency and approved by BS 6540.2. 20.14 Cooling Water Pump House Duty and standby localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the electrical room and Control room respectively.2.3.17 Fire Pump House Ducted mechanical ventilation system shall be provided for fire pump house.12 Water Treatment House Localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the equipment room. 20. equipment storage and pump house respectively. Indoor unit shall be wall mounted type.2. 20 . Roof ventilator with appropriate duty and standby redundancy shall be provided for mechanical ventilation space.19/55 299003401.doc . Constant air volume air valve shall be provided at each fume cupboard connection.2. Duty and standby laboratory exhaust fan shall be provided. Indoor unit shall be wall mounted type.3. BUILDING SERVICES Thai Binh 2 Thermal Power Plant 20.13 Limestone Storage and Milling Duty and standby localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the electrical equipment room and C&I room respectively. Wireless remote control shall be provided for each indoor unit. laboratory and office respectively.3. 20. Roof ventilator with appropriate duty and standby redundancy shall be provided mechanical ventilation area.15 H.3. 20. Mechanical ventilation system shall be provided for toilet.3.2.18 Ash Slurry Pump house Ducted mechanical ventilation system shall be provided for the ash slurry pump house.20.3.F.16 Mechanical Equipment Warehouse Localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the office. Indoor unit shall be wall mounted type. 20. Duty and standby mechanical ventilation system shall be provided for electrical equipment room. Exhaust duct shall be of stainless steel grade 314.2. Indoor unit shall be wall mounted type.2.3. Laboratory shall be equipped with its own duty and standby direct expansion air conditioning units using 100% fresh air. 2. Ducted mechanical ventilation system shall be provided for toilet and maintenance area. BUILDING SERVICES Thai Binh 2 Thermal Power Plant 20.3. 20. Supply and exhaust ducts installed shall be made of stainless steel grade 314.20 Emergency Generator Room Ducted mechanical ventilation system shall be provided for the Emergency Generator room. Wireless remote control shall be provided for each indoor unit. 20. corridor and other space require air conditioning.22 Bulldozer Garage Localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the office. duty and standby ducted supply and exhaust fan c/w supply and exhaust grilles shall be provided for mechanical ventilation space. Intake air shall be filtered and taken from side of the room.2.23 Coal Milling Station Roof ventilator with appropriate duty and standby redundancy shall be provided mechanical ventilation area. Ducted return shall be used and fresh air shall be connected at the return plenum before the air filter. Indoor unit shall be wall mounted type.20. 20. ACMV equipments shall be explosion and acid proof.3.3. The outdoor condensing unit c/w condenser enclosure shall be mounted outside the building.2. The Contractor shall provide ventilation fans and ducting for the Chlorination Plant including the neutralizing room.3.21 Chlorination Plant Duty and standby localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the Control and Electrical room. 20. Indoor unit shall be wall mounted type. manager room. Indoor unit shall be wall mounted type.doc .2.3.24 Maintenance Workshop Duty and standby centralized ducted air-cooled packaged units c/w control shall be provided to serve the meeting room. Ducted exhaust fan c/w exhaust 20 . Localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the rest room.3.2.19 Return Water Pump House Duty and standby localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the MCC room.20/55 299003401. Air filter shall be provided upstream of the cooling coil to provide 95% up to 5 micro filtration efficiency. Laboratory shall be equipped with its own duty and standby air-cooled direct expansion units using 100% fresh air. Make up air shall be through the weatherproof louver c/w insect screen and filter with dust spot 65% efficiency and approved by BS 6540. Laboratory exhaust duct shall be of stainless steel grade 314 and shall be ducted to the high level for air discharge. Chemical room shall be equipped with its own duty and standby mechanical ventilation system. 20. Exhaust shall be at high level and make up air at low level. Fans and equipments shall be explosion proof. For mechanical ventilation system.2. After assembly. 20.25 Electrical and I&C Warehouse Duty and standby centralized ducted air-cooled packaged units c/w control shall be provided to serve the warehouse and other space require air conditioning. evacuated and fully charged with refrigerant R134a or other equally acceptable Ozone friendly refrigerant and includes an initial oil charge. installation. Laboratory exhaust via fume cupboards and air grilles shall be ducted to the roof for air discharge.4 Material and Workmanship Equipment.3.2. an operational test shall be performed with water flowing through the cooler to check that each refrigeration circuit operates correctly. BUILDING SERVICES Thai Binh 2 Thermal Power Plant grilles shall be installed for female toilet and male toilet.26 International and Local Consultant Office Localized air-cooled direct expansion units c/w wireless remote control shall be provided to serve the office and other space require air conditioning.2. 20.5. The outdoor condensing unit c/w condenser enclosure shall be mounted outside the building. Indoor unit shall be wall mounted type.2. Constant air volume air valve shall be provided at each fume cupboard connection.21/55 299003401. workmanship.5 Air-Conditioning System 20. The ventilation shall be adequately sized to ensure that the turbine generator house is slightly pressurized.3. Make up air shall be through the weatherproof louver c/w insect screen and filter with dust spot 65% efficiency and approved by BS 6540.20.27 Turbine Generator House Laboratory shall be equipped with its own duty and standby direct expansion air conditioning units using 100% fresh air. The unit shall be pressure tested. Exhaust duct shall be of stainless steel grade 314. The exhaust air shall be ducted to the high level for air discharge. Mechanical ventilation system shall be provided for toilet. 20.doc . 20. testing and commission of the ACMV system shall comply with this Specification. Roof ventilator with appropriate duty and standby redundancy shall be provided for turbine building generator building. material. ready for field installation. The unit structure shall be heavy 20 .2. Ducted exhaust fan c/w exhaust grilles shall be installed for female toilet and male toilet. Supply air taken by infiltration through the louver.3.2.2. Duty and standby laboratory exhaust fan shall be provided.1 Centrifugal Type Chillers General The air cooled centrifugal liquid chiller shall be completely assembled with refrigerant piping and internal wiring. The exhaust air shall be ducted to the high level for air discharge. Supply air taken by infiltration through the louver. 20. Wireless remote control shall be provided for each indoor unit. Isolators shall be proportioned for the loads at points and isolators for one unit shall be mounted on floating concrete base extending under the entire unit and isolating the building construction from any vibrations. Oil piping shall be completely factory installed and tested. The rotor assembly shall consist of a heat-treated alloy steel drive shaft and impeller shaft with a cast aluminum. bolted to the cast iron adapter mounted on the compressor to allow the motor to be rigidly coupled to the compressor to provide factory alignment of motor and compressor shafts. painted galvanized plate steel. thermostatically controlled to remove refrigerant from the oil. continuously during operation and during coast down. gears and rotating surfaces by an oil pump which operates prior to start-up. The open motor shall be provided with a D-flange. separate from the compressor shall contain a submersible oil pump and immersion-type oil heater. Internal single helical gears with crowned teeth shall be designed so more than one tooth is in contact all the times to provide even distribution of compressor load and quiet operation. coated with backed-on enamel. Compressor The compressor shall be single stage centrifugal type powered by an open drive electrical motor. fully shrouded impeller. precision bored and axially grooved. Compressor castings shall be designed for the highest working pressure and hydrostatically tested in accordance with the design standard. The lube oil system shall be designed so sufficient oil is supplied during coast down and in the event of power failure. Insert-type journal and thrust bearings shall be fabricated of aluminum alloy. 20 . Compressor Motor The compressor motor shall be an open squirrel cage induction motor. Lubrication Lubrication oil shall be force-fed to bearings. Motor drive shaft shall be directly connected to the compressor shaft with a flexible disk coupling. A gravity-fed oil reservoir shall be build into top of the compressor to provide lubrication during coast down in the event of a power failure. BUILDING SERVICES Thai Binh 2 Thermal Power Plant gauche. The housing shall be fully accessible with vertical circular joints. An automatic oil return system to recover any oil that may have migrated to the evaporated shall be provided. dynamically balanced and over speed tested for smooth. galvanized steel. The shaft seal shall be a spring loaded carbon ring with precision lapped collar cooled by oil during operation. Pre-rotation vane position shall be automatically controlled by an external electric actuator to maintain constant leaving chilled water temperature. The impeller shall be designed for balanced thrust. Oil shall be filtered in an externally mounted 0.22/55 299003401. Each gear shall be individually mounted in its own journal and thrust bearings to isolate it from impeller and motor forces. An oil reservoir. The coupling shall be of metal construction with no wearing parts and no lubrication requirements.20. Each chilling unit shall be mounted on vibration isolators under feet.doc . vibration-free operation. Based rails shall be of formed double thickness. with complete operating assembly removable from the compressor and scroll housing. Capacity Control Capacity control shall be achieved by use of pre-rotation vanes to provide fully modulating control from full load to minimum load.5 µm replaceable cartridge oil filter equipped with service valves. Four separate. cylindrical.  Remote reset temperature range. The rotors shall be manufactured from forged steel and use asymmetric profiles. The unit shall be pressure tested.23/55 299003401. Angular-contact ball bearings handle axial loads.I.  Pull down demand limiting. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Power and Control Panel The unit shall be supplied complete with a microprocessor based control system in a lockable enclosure. The control system includes a 40 character alphanumeric display showing all system parameters with numeric data in S. an operational test shall be performed with water flowing through the cooler to check that each refrigerant circuit operates correctly.  Percent current limit. The terminal boxes are rain-tight. 20 . The unit structure shall be heavy-gauche.2. galvanized steel.doc .20. The design pressure shall be in compliance with the chiller as well as the cooling medium conditions. factory-mounted. The compressor housing shall be made of cast iron. utilizing the latest technology to provide the most reliable and energy efficient compressor available at all operating conditions. The compressor shall incorporate a complete anti-friction bearing design for reduced power and increased reliability. Capacity Control The compressor motor shall preferably be an open squirrel cage induction type motor. painted galvanized plate steel. roller bearings handle radial loads.2 Screw Type Chillers General The air cooled screw liquid chiller shall be completely assembled with refrigerant piping and internal wiring. Base rails shall be of formed double thickness.  Seven-day time clock for starting and stopping chiller. Compressors The rotary twin-screw compressor shall be engineered and constructed to meet the exacting requirements of the industrial refrigerating market. Together they shall maintain rotor positioning at all pressure rations thereby minimizing leakage and maintaining efficiency. 20. and insulation for maximum durability. wired and tested. Heat sensing thermistors are an integral part of the motor of reliability protection. precision machined to provide minimal clearance for the rotors. The compressor shall be driven by an electrical motor via a gear speed control for increased capacity and improved volumetric efficiency. After assembly.5.  Digital programming of essential set points through a color coded keypad includes:  Leaving chilled water temperature. coated with backed-on enamel. The motor stator is of epoxy bonded core construction with glass-served windings. units. evacuated and fully charged with refrigerant R134a or other equally acceptable Ozone friendly refrigerant and includes an initial oil charge. ready for field installation. 20. and low velocity provide effective separation over a wide range of operating conditions. The refrigerant to refrigerant plate type economizer shall be constructed of acid resistant stainless steel. An immersion oil heater shall be located in the oil separator reservoir and compressor. The heat exchangers shall be designed according to the requirements of the system. On the main control panel door a further door. An external. Piping is ACR copper. replaceable-cartridge oil filter shall be provided with manual isolation stop-valves. coastdown and in the event of power failure. Impingement. system pressure differential provides proper oil flow without the need of an oil pump. with Perspex viewing window shall be located on the exterior of the control compartment door to house the microcomputer keypad and display. The temperature limits are -195oC to +185oC. if required  Fan fuses 20 . It shall be temperature-actuated to effectively remove refrigerant from the oil during shutdown. with brazed joints. Oil cooling. The control panel shall be designed to IP65 for outdoor weather protection and finished in zinc phosphate pre-treated bake enamel. The compressor also shall have an oil reservoir located at the rotor bearings to provide lubrication during start-up.doc . Refrigerant Circuit Independent refrigerant circuits shall be furnished on each unit. Doors shall be hinged and lockable and include door stays. Power wiring shall be provided to the control centre. shall be provided by liquid injection into the compressor and discharge temperatures for all conditions. The control center provides consistent oil temperature to ensure proper oil viscosity independent of system conditions Economizer An economizer shall be included in each refrigerant circuit to enhance the overall system performance. direction change.24/55 299003401. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Lubrication The compressor shall have a closed coupled oil separator with no moving parts to minimize oil carryover for optimum heat exchanger efficiency. The liquid line includes:  A shutoff valve with charging port  Sight glass with moisture indicator  Thermal expansion valve  Solenoid valve  Filter-drier Power and Control Panel Controls and motor starting equipment necessary for unit operation shall be factory wired and function tested. Each power compartment shall contain:  Star/delta compressor starting contractors. when required. The main oil reservoir shall be located in the oil separator. During operation. Components shall be mounted on galvanized steel back plates and enclosed in the relevant power or control compartment of the galvanized steel enclosure. 25/55 299003401.2. for immediate and future supply including availability of complete components such as compressor and motor and the duration of replacement in the event of a major breakdown.20. if detailed items on standard equipment differ from those specified. BUILDING SERVICES Thai Binh 2 Thermal Power Plant  Control interface relays  Incoming mains terminal block per compressor  Incoming mains bus bars  Control circuit (220/230V) serving compressor solenoids  Compressor heaters  Compressor and fan contractor coil with residual current circuit breaker The 24V compartment contains:  Auto/off switch mounted on the door  Microprocessor board  Power supply board  Keypad  Display mounted under a Perspex door 20.doc . A full change of refrigerant necessary for efficient operation of the chiller system shall be provided by the Contractor. a direct expansion chiller with two refrigerant circuits. The chiller shall be capable of working at reduced load to at least 15% of its design cooling capacity. The complete unit shall be factory assembled and tested to conform to ANSI B9. it shall be the Contractor's responsibility to ensure controls are supplied and installed as part of this Contract. Names of local suppliers shall be included.1 Safety Code for Mechanical Refrigeration. one for each condenser and a control console. Internal wiring of controls shall be complete to terminal strips and shall be designed for installation in a tropical climate. The refrigerant shall be of a type recommended by the Montreal protocol. Tenders shall be accompanied by evidence of ready availability of all spare parts.3 Reciprocating type Chillers General Hermetic reciprocating air-cooled chiller sets shall be supplied and installed where required. The chiller sets shall be basically standard arrangements as supplied by individual manufacturers.5. two condensers having built-in sub-coolers. The chillers shall be ARI certified. Each set shall be a complete one packaged system with multiple serviceable compressors. Compressors Each chiller set shall incorporate at least four reciprocating compressor/motor assemblies as specified hereunder: 20 . The shell safety devices shall conform to the latest appropriate codes. Evaporators The chiller shall be of the uni-shell construction and in accordance with ASME Boiler and Pressure Vessel Code Section VIII and TEMA.doc . The shell of the chiller shall be covered with a layer of closed cell foam plastic insulation with a vapor barrier. refrigerant strainer/dryers and all necessary safety-controls including over-temperature protection for motors. The controls shall Include but not be limited to the following: 20 . manual controls and automatic controls and safety cutouts as required to ensure safe operation of the machine. Controls Each chiller set shall be provided with control console which shall contain indication lamps. gauges. Compressor castings shall be completely sound and free from porosity. The condenser fan motors shall have inherent overcurrent protection. Each compressor motor shall have internal motor protection against overheating. Such equipment shall include shut-off valves. The measured sound pressure level (dBA) at a distance of 5m from each chiller shall not exceed 67. BUILDING SERVICES Thai Binh 2 Thermal Power Plant The compressor shall be of the reciprocating. Condensers The air-cooled condensers coils shall be complete with integral sub-coolers. Noise Level Each chiller shall be of low noise type. control bulbs and gauges. provided by quick-sensing elements embedded m motor windings. Minimum quality shall be 1 x 10-4 m2 K/W. Compressors shall be mounted on spring vibration isolators to minimize sound and vibration transmission to the unit frame and the building structure. Compressor speed shall not exceed 1450 rpm.26/55 299003401. Also. Flow of refrigerant from condenser to the chiller shall be monitored by the sight-glass provided. Each refrigerant circuit shall have its own thermostatic expansion valve. Lead-lag selection shall be provided for the compressors of each chiller set. Seamless copper tubes shall be rolled into the tube sheets. The number of cycles per hour permitted per compressor shall not exceed 6. The chiller shall be a shell-and-tube type and shall have four direct expansion refrigerant circuits. Compressor crankcase heaters shall be provided for protection against refrigerant migration and oil dilution. cleaned.20. Hot-gas mufflers shall be installed to give smooth and quiet operation. and shall be on during compressor off cycle. leak tested at 1034 kPa and pressure tested at 3103 kPa. hour-rated meter shall be incorporated for every compressor. The fouling factor for the chiller shall be suitable for the conditions of service. serviceable hermetic type of modern design and shall be fully equipped in accordance with the latest practice. They shall have copper fins mechanically bonded to seamless copper tubes. Eliminators shall be provided to prevent carry-over of liquid refrigerant to the compressors.5 measured according to ISO 3746 International Standard. dehydrated sealed. Taps shall be provided in the shell heads for thermometers. At the completion of the Defects Liability Period. chilled water thermostat. Manual transfer switch shall be provided which changes the lead compressor in the stopping sequence to assure balanced wear on compressors. filter drier and time delay relay to have a minimum of 5 minutes between each start-stop of the compressor. evaporator pressure gauge. Any chilled water pump 3.20. The final selection . BUILDING SERVICES Thai Binh 2 Thermal Power Plant Pressure gauge. The Contractor shall replace at his own cost all refrigerant lost. the Contractor shall fully charge the system with refrigerant to the maximum running level Chemicals used in the chilled water treatment system shall also be fully topped up upon expiry of the Defects Liability Period.of vibration isolators shall be based on at least 97% efficiency of the predominant frequency. The refrigerant shall be pure and free from moisture. First duty compressor 20 . due to mechanical failure of any part. Vibration Isolation The Contractor shall consult with the chiller manufacturer to determine the exact requirements for vibration isolation of the chiller' sets. control switches and start-stop indicator flush mounted on the control panel A multi-step controller shall be provided for optimum control of chilled water temperature for closer capacity control. condenser pressure gauge. moisture indicator. Operation of the Reciprocating Chiller Units The starting of each reciprocating chiller unit shall be arranged so that any compressor will only start when no adverse conditions are present. The Contractor shall provide full charge of oil and refrigerant for the satisfactory operation of the chillers. faulty design. and all other leakages in the refrigerant system. solenoid valve. oil pressure gauge. The console shall be factory wired to a terminal strip ready for connection to remote controls and interlocks.doc . The reciprocating unit and its auxiliary equipment shall be started in the following sequence: 1. maintenance and repair shall be provided and handed over together with the air conditioning system. operation indicators. ammeter. The Contractor shall submit details of the chilled water treatment system for approval. Other accessories to be included shall be high-low pressure switch. Water and refrigerant pulsation through the chiller sets must be considered during final selection. Accessories and Equipment One set of special tools and equipment required for service. safety control indicators. during the period from completion to handover and during the Defects Liability Period. AHU blowers 2.27/55 299003401. low temperature cut-out switch. The Contractor shall carry out monthly water analysis and submit monthly reports with comments and recommendation on remedial action for chilled water circuits. The Contractor shall supply chemicals for testing and commissioning and operation of the installation during the period after completion to handover and during the Defects Liability Period.28/55 299003401. The discharge of the said chemicals into any sewer shall comply with the requirements stipulated by the local Authority.2. These units shall include. The chemicals used shall have no detrimental effect on non-metallic materials such as rubber. The sets will be automatically rotated weekly so each set experiences approximately equal running hours. Packaging. the second and third sets shall come into operation when the control system senses that additional cooling capacity is required. The quantity of chemical shall be delivered on a regular interval of no more than 3 months to site to avoid deterioration and storage problems and shall be sufficient for continuous water treatment of the system for three months. The Contractor shall submit details of his proposed control system for approval before implementation. It shall be compatible and neutral to the pipe material. The Contractor shall also carry out all the necessary remedial actions. This shall be done throughout the period between completions to the end of the Defects Liability Period. storage and handling of chemicals shall be in accordance with manufacturer's recommendation and shall comply with the practice and requirements stipulated by the relevant local Authority.4 Air Handling Units General Air handling units shall be certified in accordance with ARI Standard or approved equivalent standard by an independent testing laboratory.  Fans. 20 . Corrosion Control The Contractor shall supply and install the equipment in the pump room.  Cooling coils. The proposed scheme shall be approved before implementation. 20.doc .20.5. for a complete automatic water treatment system for the chilled water circuit. BUILDING SERVICES Thai Binh 2 Thermal Power Plant After the first set of chilled water pump and chiller set is in operation. The storage of chemicals delivered shall be confined to the space designated. epoxy anti-corrosive lining etc. which may be used in the piping system. The chemicals used for treatment and the methods used to feed the chemicals shall comply with the local health codes. Nitrate based chemicals shall be used and the Contractor shall engage specialists to provide water treatment and water analysis to control corrosion. The Contractor shall ensure the chemicals and the end products of the water treatment program do not have adverse effect on the environment. but not be limited to the following components:  Sheet metal housing coated with baked enamel finish to BS 3830 or approved equivalent standard. drives and motors. rigidly reinforced with external hat channels. Casings. Casing panels shall be removable for easy access to the unit. It shall be insulated with 16mm thick iso-cyanurate foam faced with an additional aluminum foil vapor barrier and cemented between the steel outer pan and the heavy gage steel inner pan. BUILDING SERVICES Thai Binh 2 Thermal Power Plant  Insulation .4 kg density glass fiber insulation which shall be secured to casing with waterproof adhesive and permanent fasteners and shall meet NFPA 90A flame spread and smoke generation requirements. The units shall be mounted on vibration isolators and properly sloped to facilitate drainage of condensate. housings. galvanized steel formed panels. Access doors shall be air tight and provided to each AHU for maintenance purpose. adhesive and inner coating shall comply with NFPA-90A flame spread and smoke generation requirements. Casings.6 mm thick. Casings. drain pan shall extend under complete fan and coil section. 20 . having greatest dimensions between 1000 mm and 1500 mm shall no be less than 1.doc . Insulation. housings. plenums and chambers in low and medium pressure systems which exceed 1500 mm in any dimensions shall be no less than 1. On single coil horizontal draw-through units with short coil sections. plenums and chambers in high pressure systems which have greatest dimensions between 1000 mm and 1500 mm shall be no less than 1. Inner pan shall be coated with corrosion-resistant elastromeric based material. The air handling units shall be the standard draw-through single outlet type with an internally mounted motor unit.500 mm in any dimensions shall be no less than 2.  Air filters.  Vibration isolators and flexible connections. plenums and chambers in high pressure systems which exceed 21. The condensate drain pan shall have double wall construction with threaded drain connections on both sides and shall extend under the complete long coil section of the horizontal draw-through units.20. The casing panels shall be constructed so they shall comprise of two layers of galvanized metal sheet sandwiching the insulation in-between.0 mm. Coil and fan section panels shall have 1.  Drain pans and drain piping. Condensate drain pan shall be made of stainless steel material constructed to prevent water leakage and rust.3 mm thick galvanized sheet metal. housings. plenums and chambers in low and medium pressure systems. Draw-Through Type Air Handling Units Unit Casing and Fan Sections Component modules shall be constructed of sectionalized heavy gauge.29/55 299003401.6 mm thick.  Supports and brackets.acoustic as well as thermal in accordance with this Specification. Casings. housings. Chilled water coils shall be of aluminum plate fins on 13 mm OD staggered copper tubes. Each coil unit shall be fitted with an automatic air vent with vent line leading to the floor drains system. double inlet type with backward curved airfoil blades. Chilled water coils shall be drainable and have non-trapping circuits. The frame material shall be aluminum. A tap point shall be provided with basin for washing the filters.07 MN/m2 (G). Bearings shall have a grease line extending to one side of fan scroll. Maximum working pressure shall be 2.000 hours at design operating conditions. Fans and shafts shall be selected to operate at least 25% below the first critical speed. Fan wheels and shafts shall be statically and dynamically balanced as an assembly. equipped with spring clips to hold it securely in the holding frame. removable from coil connection side of casing and supported in tracks over the entire length of the coil. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Coil sections shall be constructed of galvanized steel. motor and drive shall be provided. turned. Wheels shall be painted with a zinc-chromate primer and an enamel finish coat. Bearings Bearings shall be self-aligning. motor and casing panels. Chilled water coils shall have galvanized steel casings and steel header. Low and medium pressure fans (for total static pressures up to 140 mm wg) shall be double width. The size of the basin should be large enough for washing the filters. the entire unit shall be given final vibration test. Each filter shall consist of a holding frame and a complete filter cell.30/55 299003401. Coils Coils shall be of the cartridge type. A removable panel located on the drive side of the unit.20. Fan wheels shall be keyed to the shaft and designed for continuous operation at the maximum rated fan speed and motor horsepower. 20 . Fins shall have belled collars and shall be bonded to tubes by mechanical expansion. ground and polished. and have a formed channel base for integral mounting of fan. After final assembly. Fan scroll and bearings shall be mounted on an “A” or “H” frame rigidly secured to the channel base. Chilled water supply to coil shall be complete with petcocks for pressure gauges connection and provisions for dial type thermometers at supply and return sides of pipes. Fans Fans shall be of the centrifugal type backward curved with non-overloading characteristics. of adequate size to permit removal of the fan wheel. Internally mounted motor shall be factory installed on slide rails which have 2 adjusting screws. Wheels shall be bonderized steel painted with bakedon enamel or galvanized steel. heavy duty pillow block regreaseable ball types selected for an average life of 300.doc . Air Filters Air filters shall be 50 mm thick of the steel wire type. double inlet type with backward curved blades. Shafts shall be solid steel. Motors Units shall be supplied with factory-installed motors of-totally enclosed fan-cool type with protection to IP 55. Medium and high pressure fans (for total static pressures to 230 mm w g) shall be double width. The drive motor shall be of the variable speed totally enclosed squirrel cage type with twin drive shafts and shall comply with the appropriate parts of BS 4999. The fan coil units shall be provided with a washable foam filter. BS 5000 Part 10. Changeover of chilled water flow and air outlet dampers for this operation shall also be automatic and shall be interlocked with the AHU fan motors. Secondary drip trays shall also be provided and arranged to catch drips from the whole of the fan coil unit and control valves. The proposed method of fixing shall be submitted for approval. the duty unit(s) shall be automatically shut down by a timer which shall then start the standby AHU. The coil shall be designed to permit movement of the tubes during expansion and contraction. filter.2. heavily protected against moisture by bitumen coating. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Operation of The Air Handling Units On completion of one operating cycle. The precision air conditioning unit shall be rated to ARI standard and sized for the room design cooling loads including fan heat.5. Vertical units shall be fixed to the rear wall and horizontal units to the soffit.2 mm thick.31/55 299003401. 20 . Each fan coil shall have isolating and automatic chilled water supply "on/off" valves. 20. Additionally the AHU fan motors shall be interlocked with the smoke detector at the return air duct to shut down the units in the event of fire occurring in any of the conditioned areas. filter.2. fans.20. They shall be manufactured from hot dipped galvanized heavy gauge sheet steel 1. The fan coil unit shall incorporate an effective thermal and acoustic insulation with self extinguishing characteristics to BS 2972 Class 2. The tubes shall terminate in copper or steel headers that are screwed BSP female parallel thread or flanged. The filter media shall be germicidally treated and easily removable from the unit. The fan coil unit shall be rated to ARI standard and sized for the room design cooling loads including fan heat. 20. Fan coil units shall be securely fixed to the building structure. where standby is provided. heating/cooling coils and all necessary wiring and controls.5. Part II. Units shall be provided with supply and return air openings with grilles made from die-cast non-ferrous metal. heating/cooling coils and all necessary wiring and controls. Coils shall be manufactured from solid. a manual selector shall be provided for overriding the timer when manual selection of the AHU Is desired. A drain pipe shall be taken to the nearest gully.5 Chilled Water Fan Coil Units General Each chilled water fan coil unit shall comprise cabinet. fans. drawn copper tube to BS 2871 Part 1 Table 'X' with aluminum fins which shall be bonded onto the tubes. and Part 99.doc .6 Chilled Water Precision Air Conditioning Unit General Chilled Water Precision Air Conditioning Unit shall comprise cabinet. insulated and provided with a drain connection. The plates shall be pressed with a combined double flange at an angle of 45° and 90° to the face of the plate. Each fan coil shall have isolating and automatic chilled water supply "on/off" valves.78 mm and 0. cleats. stiffeners and piping. and bolts. Tank Construction and Accessories Construction The chilled water expansion tank shall be made from pressed steel sections. drawn copper tube to BS 2871 Part 1 Table 'X' with aluminum fins which shall be bonded onto the tubes. Vents shall also be provided. The coil shall be so designed as to permit movement of the tubes during expansion and contraction. The steel tank shall be made from hydraulically pressed steel sectional plates with external flanges and shall be supplied and erected complete with internal bracings. BS 5000 Part 10. The fan coil units shall be provided with a washable foam filter. The Contractor shall completely design the expansion tank and associated piping to suit the chilled water systems. The drive motor shall be of the variable speed totally enclosed squirrel cage type with twin drive shafts and shall comply with the appropriate parts of BS 4999.35 mm thick. plates of 4. Vertical units shall be fixed to the rear wall and horizontal units to the soffit. 20.2 mm thick. insulated and provided with a drain connection. The 1.5. Units shall be provided with supply and return air openings with grilles made from die-cast non-ferrous metal.S.22 m square panels shall be pressed from BS 4360 M. They shall be manufactured from hot dipped galvanized heavy gauge sheet steel 1. heavily protected against moisture by bitumen coating.7 Chilled Water Expansion Tank General The Contractor shall supply one pressed steel Chilled Water Expansion Tank complete with accessories for a fully functioning system. cover bearers. washers. The filter media shall be germicidally treated and easily removable from the unit.2. BUILDING SERVICES Thai Binh 2 Thermal Power Plant The precision air conditioning unit shall incorporate an effective thermal and acoustic insulation with self extinguishing characteristics to BS 2972 Class 2. Fan coil units shall be securely fixed to the building structure.20. 20 . The proposed method of fixing shall be submitted for approval.32/55 299003401. jointing compound.doc . Any raised platform including a platform for maintenance (with safety railings) and its support structures shall be in the Contractor's supply. The tank shall be roofed with steel plates. nuts. Secondary drip trays shall also be provided and arranged to catch drips from the whole of the fan coil unit and control valves. Coils shall be manufactured from solid. and Part 99. Part II. The tubes shall terminate in copper or steel headers that are screwed BSP female parallel thread or flanged. 6 mm minimum. A level indicator of approved material. the supply and installation of the following: 1.2. As soon as possible after the completion of the erection and painting of the pressed steel tank. Ancillary Work The Contractor shall include in the price quoted for the tank. 20. Non-contaminating and non-toxic bituminous compound shall be supplied for jointing between flanges and for finishes.8 Centrifugal Pumps Chilled water centrifugal pumps shall be supplied where required. The interior surfaces of the tank shall be cleaned by wiping with dry cloth soaked in Xylol. materials and shall wash and brush down all internal surfaces. and if after a period of three days there is no measurable drop in level nor any sign of leakage from any point in the tank or any pipe and fittings. If any leaks or defects are observed. Design In addition. 2. Painting The external surfaces of the tank and supports and other appurtenances shall be prepared for painting by power wire brushing. The stays shall be constructed of angle sections and the box section cleats shall be fabricated from mild steel plates conforming to BS 4360. the Contractor shall remove all dirt. and testing of the tank shall be repeated. After the tank has been filled to the intended working level the surface level of the water shall be measured by an approved means. the tank shall be deemed to be watertight.doc . The surface shall be clean and dry before application of the primer. After cleaning and when water for filling becomes available to the Contractor.20. the tank shall be gradually filled to the intended working level.33/55 299003401. Grease and oil shall be removed by wiping with clean cloth soaked in Xylol. and covered with weatherproof aluminum cladding of 0. 4. debris. these shall be made good at the expense of Contractor. The pumps selected shall be 20 . BUILDING SERVICES Thai Binh 2 Thermal Power Plant The stays and cleats shall be designed to give complete rigidity to the tank under the imposed loads. inspection and testing of the pumps supplied shall comply with the appropriate standards of the Hydraulic Institute Standards or governing specification. shot blasted to remove residual plate-scale and then painted with two coats of epoxy paint as approved by the local Authority. Access manhole in the roof of the tank complete with hinged cover and padlock. The manufacture. Galvanized access ladder with cage. Roof vent sized to prevent collapse of the tank. the expansion tank shall be insulated with polyurethane of 50 mm thickness and 49 kg/m3 density minimum.5. 3. The primer shall-be a zinc chromate iron oxide primer. The pumps shall be direct coupled to the motors by means of rubber sheathed pin type flexible couplings sized to suit the horsepower of the motors.20.doc . Eccentric tapered reducer at suction 9. Gate valves at suction and discharge 7. Approved strainer at suction 5. The pumps shall have cast iron casings and pedestals. Pumps shall also be fitted with mechanical seals. and-shall be directly coupled to the drive. The pumps shall be for horizontal mounting and shall be complete with motor. The pumps shall be of adequate strength to withstand the hydraulic and other forces encountered. Flexible connections at pump suction and discharge 4. The pumps shall be of approved manufacture of the centrifugal end suction type. The following fittings shall be required for the pump installed: 1. common base plate. anti-vibration devices and all accessories necessary for the proper functioning of the units. Automatic air relief valve 2. Any curve indicating excessive shut-off head will not be approved. The automatically controlled pumps shall be provided with a 20 mm relief valve set slightly below the shut-off pressure and arrange to permit circulation of sufficient water to prevent the pump from overheating. when operating with a closed discharged valve. The speed shall not exceed 1450 rpm. Globe valves 20 . The pumps shall incorporate shaft wearing sleeves. The impellers are to suit the performance duty specified. Pressure gauges 8. Each pump casing shall have ample space to take an impeller one size larger than that capable of performing the required duty.34/55 299003401. Approved check valve at discharge 6. The pumps supplied shall be the non-overloading type. The Contractor shall guarantee the performance of the pumps and to submit for approval the hydraulic calculations and the characteristic curve of the pump offered. The couplings shall be guarded-in accordance with the appropriate code requirements. bronze impellers and stainless steel shafts. Circulation relief valve 3. The stuffing boxes provided shall have the primary function of protecting the pumps against leakage at the point where the shaft passes out through the pump casing. Suction and discharge connections shall be flanged. mechanical seals and drip wells with screwed outlets. The Contractor shall ensure all pumps are adequately primed at ail times. BUILDING SERVICES Thai Binh 2 Thermal Power Plant able to handle the capacities as required. BUILDING SERVICES Thai Binh 2 Thermal Power Plant 20. A liquid line dryer shall be provided. Compressor protection devices shall be of the auto-reset type. Fan Coil Unit (FCU) The evaporator fan shall be capable of delivering the desired quantity of air.doc . bonderized and finished with epoxy powder coatings.20. with aluminum plate fins mechanically bonded to seamless copper tubing with joints brazed. the sound pressure level at 1 m away from the fan-coil shall not exceed 54. The controls shall give a temperature tolerance of ± 0.5. Coils shall be non-ferrous. 20 . The fan is required to be silent and free of all vibrations during operation. The system shall be protected by high and low pressure stats and temperature sensitive compressor motor overloads. Condensing Unit (CU) The condensing unit shall be for outdoor installation. The compressor shall be hermetically sealed type. The wall mounted fan-coils shall be provided with remote control switch-cum-thermostat with at least 3 m control wiring. The fan speed shall be variable by means of a Hi-Med-Lo switch.9 Air-Cooled Split Units General The unit shall contain an outdoor compressor-condenser section and a direct expansion fan coil section. A built-in thermostat shall be incorporated into the controls to de-energize the condensing unit when the return air is at a set temperature. In general.2. The condenser fan shall be of the direct driven axial type with vertical or side discharge for low power consumption and quiet operation.35/55 299003401. The condenser shall be fitted with coils construction from copper tubes with aluminum fins and be for outdoor installation and corrosive/aggressive environment. Panels shall be easily removable for servicing and maintenance. There shall be a provision for draining the base pan through heavy duty UPVC drain pipe to the nearest floor trap. Components shall be factory assembled and tested. The fan-coil cabinet shall be constructed of galvanized steel.5°C. Controls The electrical control assembly shall incorporate a compressor motor timer circuit to prevent the restarting of the compressor more than once every four minutes. Compressor The compressor shall be external spring mounted serviceable hermetic type with automatic reversible oil pump. The side and bottom shall be fully insulated to prevent external condensation and muffle noise. The fan shall be a centrifugal blower driven by a permanently lubricated motor. The casing shall be made of epoxy powder coated galvanized steel plates. pre-charged and with all necessary controls pre-wired. suction and discharge service valves. Controls The built-in electrical controls shall contain a low voltage control circuit transformer compressor relay. The compressors shall be of the serviceable hermetic or semi-hermetic type with built-in reversible oil pump and mounted on external spring isolators. ready be installed and operated. The fan coil unit shall have a fabricated drip tray complete with a drainage system incorporated. The condenser shall be for outdoor installation and corrosive/aggressive environment. The condenser coil shall be of non-ferrous construction with aluminum plates mechanically bonded to seamless copper tubing with all joint brazed. 20 . The evaporator fan shall be capable of delivering the rated quantity of air against the total external system static pressure.5. Fan-Coil Unit/Packaged Unit (PU) The fan coil unit shall consist of compressor(s). Packaged Condensing Unit (PCU) The packaged condensing unit shall consist of compressor(s). Top. bottom and side shall be fully insulated to prevent sweating and to muffle noise.  Thermal overload relays for overcurrent protection. condenser and condenser fan enclosed in a single weatherproof casing. The blower fan shall be of centrifugal forward curve type.20. The evaporator coil shall be of the same construction as the condenser coil. belt driven by a permanently lubricated motor. blower fan and motor enclosed in a water-proof casing.doc . direct-expansion evaporator coil. The system shall be protected by high and low pressure and temperature sensitive compressor overloads. The packaged condensing unit casing shall be constructed of galvanized steel bonderized and finished with epoxy powder coatings. Panel shall be easily removable to provide access for servicing. The control panel shall be provided with the following control and indicating devices: Circuit breakers of suitable ratings for short-circuit protection.10 Air-Cooled Packaged Units General The air-cooled packaged units shall contain a fan coil unit/packaged unit and an outdoor packaged condensing unit which shall be factory assembled and tested with all necessary electrical controls pre-wired. The condenser fan shall be of the propeller type direct-driven by a drip-proof permanently lubricated motor. The timer circuit shall prohibit starting of the compressor motor more than once every six minutes. The Contractor shall propose a minimum coefficient of performance (COP) of the equipment as per local codes and regulations. shall be of the same construction as the condensing unit casing. BUILDING SERVICES Thai Binh 2 Thermal Power Plant 20. The fan coil unit casing. where necessary. fan relay and a compressor motor timer circuit.2. The compressor shall be of the same manufacture as the unit. Units above 28 kW cooling capacity shall be the twin-compressor type.36/55 299003401.  Unit selector switch. This thermostat shall be for operation on 24 VAC.  'Smoke Detector Trip" indicating light. The thermostat shall be of the on/off type and operating range of 15°C . Dampers and Accessories Sheet Metal Ductwork Ductwork shall be constructed of galvanized steel sheet metal and shall be fabricated in the Contractor's own workshop prior to installation.  Alarm bell silence pushbutton. The copper pipes shall be sized in accordance with the recommendation of the air-conditioning equipment manufacturer. Ducts shall be anchored securely to the structural slab or framing in an approved manner. 20 . The UPVC shall be secured to the wall and floor by brackets which are corrosion/rust-resistant. Refrigerant and Condensate Drain Pipework Refrigerant piping shall be copper. A built-in thermometer shall be incorporated too. 20. Thermostat Thermostat of approved type shall be supplied and installed. The Contractor is to take precautions to ensure the air distribution system is reasonably silent during operation. ammeter and hour-run meter.  Crankcase heater "On" and 'Off' indicating lights.20. Ducts shall be straight and smooth on the inside with all joints neatly finished.2. Ducts shall be free of waves.  "Emergency Stop" mushroom-type pushbutton with reset. The condensate drain pipe shall be 25 mm diameter heavy duty UPVC type and run to the nearest drain floor trap. The condensate drain pipe shall be insulated with 25 mm thick Armaflex® or approved equivalent insulation. The suction line shall be insulated with 50 mm thick Armaflex® or approved equivalent insulation.  Lamp test flush mounted push button. buckles or leaks and shall be machine bent.37/55 299003401. Refrigerant pipes shall be run in high impact UPVC and electrical wiring shall be run in conduits.11 Ductwork. BUILDING SERVICES Thai Binh 2 Thermal Power Plant  Unit start/stop flush mounted push buttons. the thermostat shall be of two stages. A liquid line dryer and sight glass shall be provided for each circuit.  Unit voltmeter. Ductwork in which the galvanizing of the inside surface has been damaged will not be accepted. Ducts shall be constructed and installed to be free from vibration under all operational conditions.  Motor Run/Stop/Trip/Outdoor PCU Emergency Stop indicating lights. UPVC subject to ingress of water shall be sealed tight with approved sealing compound.  Power "On” indicating lights.5. In case where there are two compressors in the condensing unit.doc .30°C with a differential of 1°C suitably mounted in the respective Plant Room(s) to sense the return air temperature to cycle the compressor for temperature control. Spiral Round and Duct Construction Spiral round duct shall be formed by continuous galvanized iron strip. drumming or vibration of the ductwork. The grooved seam (4-ply lock seam) of duct shall be tightly formed to produce a rigid duct and air tight to the requirement of all pressure classification without sealant application in the seam. Material Thickness For Round Duct Nominal Diameter G I Sheet Thickness Up to 205 mm 0. but not exceeding 1:4. but where this is not possible due to space constraint. At flanged connections. Ductwork shall be painted externally. The hangers and fixings shall be capable of supporting the total applied load for the period of the fire resistance required and the duct. rivets. The specified fire rating shall be with respect to a fire inside and outside the duct.38/55 299003401. A 3 mm thick continuous rubber insertion gasket shall be used between flanges. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Duct Dimensions The Contractor shall develop and install ductwork which shall include but not necessarily be limited to duct sizing.0 mm Over 1020 mm up to 1525 mm 1. The fire-rated duct materials and method of construction shall be of a type approved by the local authority. position of duct as is necessary for the installation of the air-conditioning system. The angle of all branches shall be no more than 45 degree from the axis of the main duct and shall be fitted with folded metal splitter dampers fixed in position with a rod and clamp. Duct surfaces behind registers. The fire rating shall be indicated on the Drawings.2 mm 20 .20. Angle iron in flanges shall be welded at the corners. all changes in duct size shall be made in a gradual manner with a tapering slope 1: 7 or less. small radius bends with approved turning vanes may be used. The flanges shall be painted with one coat of primer and two coats of anti-corrosive paint before they are bolted together. the angle iron shall be riveted to ducts at no more than 65 mm centers and a mastic material shall be inserted between angle iron and the sheet metal. Sheet metal ductwork shall be earthed.8 mm Over 760 mm up to 1020 mm 1. Bends shall be made with an inside radius not less than the width of the duct in the plane of the bend.doc . The Contractor shall ensure sufficient bracing is provided to prevent sagging. fixings and hangers shall be of hot-dipped galvanized steel construction.6 mm Over 205 mm up to 760 mm 0. diffusers and grilles shall be painted matt black on the inside. Fire-Rated Duct Fire-rated duct shall be provided in accordance with the requirements of the Local Authorities. The zinc coating on sheet metal shall be in accordance with Clause D of BS EN 10143. Unless otherwise specified. rupture of insulation or. the clearance space shall be filled with the local authority approved fire stop and covered with a close fitting metal angle flange. washers and screws used in the installation shall be of stainless steel. Care shall be taken to ensure dimension of ducts and fittings are correctly related.39/55 299003401. Support Rod Size The support rod sizes shall be as follows: Duct Width Minimum Rod Size Up to 450 mm 6 mm diameter 451 mm to 2100 mm 10 mm diameter Above 2100 mm 12 mm diameter Support Angles The support angles shall be as follows:Duct Width Minimum Angle Size up to 600 mm 32 x 32 x 3 mm 601 mm – 1500 mm 38 x 38 x 3 mm 1501 mm – 2100 mm 51 x 51 x 5 mm 2101 mm – 2500 mm 51 x 51 x 6. The openings shall be clearly marked. hanger rods. with approved hot-dipped galvanized steel hangers. cradles and brackets shall be made of hot-dipped galvanized steel. The Contractor shall provide a sealed access opening complete with access door to each duct in which dampers are located. and bolts. Where ductwork is supported from below.5 mm Angle supports.doc . nuts. Hangers and Openings Ductwork shall be supported to prevent vibration but shall allow for expansion without distortion of the ductwork. cradles or angle iron supports. 20 . neat hot-dipped galvanized steel angle supports shall be used. Duct Supports. Ducts are to be supported at approved intervals according to size and construction. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Prefabricated Fitting Construction Round duct fittings shall be socket and spigot joints. Supports shall be painted with aluminum or bitumastic paint. Where ducts pass through floors and walls. so that joints can be effectively scaled. damage to the supporting structure or insulation.20. Fresh air louvers shall be of the sand trap type with vertical fixed blades manufactured from anodized extruded aluminum. The air diffusion equipment shall include but not necessarily be limited to grilles.8 - 25 x 0.40/55 299003401. Access doors shall be provided in the ductwork adjacent to the fire dampers to permit inspection and replacement of fusible links Fire dampers shall be designed and installed so they will fully close. Each fire dampers shall be provided with a casing of the same material and shall be physically built-in or securely bolted to the wall or floor structure through which the duct penetrates. The type of material and the external finish for the grilles.12 Air Diffusion Equipment The Contractor shall supply and install air diffusion equipment required on the Air-conditioning and Ventilation System. all external grilles for air intake and air exhaust shall be supplied and installed by the Contractor. diffusers.8 3000 8 25 x 3 30 x 4 25 x 3 3500 1016 10 25 x 4 40 x 4 - 3500 1524 10 25 x 4 40 x 4 - 3500 Fire Dampers Fire dampers shall be of the continuous interlocking blade type closed by the action of a stainless steel spring and operated by a fusible link designed to function at 69 oC. diffusers or registers shall be submitted and approved. Fire dampers shall be provided wherever fire compartmentalization is breached by the airconditioning and mechanical ventilation systems in accordance with the local authority requirement. registers and concealed damper units. Damper installations shall be in accordance with a method approved by the damper manufacturer. Openings in ducts to receive air diffusion equipment shall be reinforced around to perimeter. Air diffusion equipment shall be selected for quiet operation when handling the specified volume of air and shall provide uniform velocity across the face. Steel parts used in the construction of the fire dampers shall be galvanized or zinc sprayed. 20 .20.doc . External Grilles and Insect Screens Unless otherwise indicated on the Drawings.2. (mm) Drop Rod (mm) Hanger Strap (mm) 305 8 813 Flat Stir Up (mm) Bearer Round (mm) Wrap Max Spacing (mm) 25 x 0.5. The Contractor shall also provide and fix bird-proof galvanized steel wire screens behind all such grilles. Gaskets shall be used to prevent leaks at the necks or around the air diffusion equipment. Damper blades over 1000 mm long shall be controlled by two linkage tie rods. under full design flow conditions. when necessary. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Round Duct Support The supports shall be as follows:- Max Duct Dia. 20. scale and rust.doc . Construction of Air Diffusion Equipment Openings in ducts to receive air diffusion equipment shall be reinforced around the perimeter. External air grilles shall be lined with bird-proof galvanized steel wire mesh.13 Duct/Pipe Insulation Thermal Insulation Thermal insulation with thermal conductivity "K" factor of not greater than 0. The insulation material shall conductivity of not more than 0. Insulation shall be installed according to the manufacturer's recommendations and by experienced workmen.5.2. Insulation shall be applied at the manufacturer's factory and where unavoidable be applied on site. Vanes shall have provision for individual adjustment. 20. vessels. Insulation materials and vapor barriers shall be non-flammable and shall be of a type approved by the local authority for use in this installation. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Air Grilles Air grilles shall be anodized aluminum and be of robust construction and be fitted with adjustable blades. 32 Kg/m 3 density for supply duct and 25 mm thick. before the insulation is applied.41/55 299003401. The aluminum foil used shall be double-sided and reinforced. 32 Kg/m3 density for return and exhaust duct.0332 W/m° K at a mean temperature of 24°C. Insulation on Factory Assembled Plant The factory assembled plant shall be insulated as recommended by the manufacturer and as specified above. Care should be taken and gaskets used when necessary to ensure leaks do not occur at the necks or from air diffusion equipment. External grilles shall match with the architectural finishes. The Contractor shall supply and install insulating materials together with all necessary associated materials such as fastenings. Surfaces to be insulated shall be dry. Each register shall be provided with stream splitter damper. vapor barriers and adhesives which are used in the application of insulating materials when applied to piping. ductwork and equipment to reduce heat loss or the prevention of condensation. unless otherwise specified.035 shall be applied to hot or cold equipment. grease-free and cleaned of dirt. The type and thickness of insulation materials shall be suitable for the specific type of surface to be covered and shall not harm the surface. The vapor barrier shall consist of doublesided aluminum for with glass fiber reinforcement and kraft paper.20. and shall be rigidly fitted on spindles so that they will not vibrate or generate noise. Special care shall be taken to ensure a complete vapor barrier over the surfaces of the insulation. 20 . Fixing of air diffusion equipment shall be of the concealed type. Duct Insulation (a) External Insulation: Air-conditioning ductwork shall be insulated with fiber glass or mineral have a thermal or factory applied vapor barrier. ductwork and piping. The insulation thickness and density shall be 50mm thick. A further 2 coats of the vapor barrier shall be given over the wrapped up glass cloth.doc .46 mm thick perforated aluminum sheet reinforcement. A further layer of Flinkote shall be applied on the insulation before they are wrapped with vapor barrier.42/55 299003401. Anti-corrosion steel tape 25 mm wide shall be strapped around the insulated ductwork at maximum 1. The perforation holes shall be approx 30% to 40% of the total surface area. In lieu of Flinkote.20. Self adhesive aluminum foils shall be used to fasten joints. The Contractor shall ensure the insulation is odorless and is able to resist disintegration due to the air-stream. The vapor barrier shall have a minimum of 70 mm overlap at all joints and securely sealed with cover strips and 75 mm aluminum adhesive duct tape to form a perfect barrier. Insulation for condensate pipes shall be flexible 25 mm thick fiberglass of 24 kg/m 3 density and shall be wrapped with cotton canvas cloth of 4 oz density. Insulation at duct corners shall be either butt joint or mitered and the aluminum lamination shall overlap by not less than 80 mm in the direction of air flow and glued securely with an approved adhesive.2. (b) Internal Insulation: The main supply ducts shall be acoustically lined with 25 mm thick of rigid mineral wool insulation of 140 kg/m3 nominal density indicated in the drawing. Insulation on pipes and ducts shall not be applied without adequate application of adhesives on the pipe/duct surfaces. The centre spacing of studs shall be: Duct Wall Min Center Spacing (mm) Top side 150 Vertical side 250 Bottom side 300 Insulation for chilled water pipe Insulation for chilled water pipe work shall be of rigid pipe sections of 48 kg/m 3 density and 75 mm thickness. Glass cloth of 200 gm/m 2 density shall be applied over the insulation with adhesive and vapor barrier such as Foster or equivalent. Where the insulation terminates. 20.5. Exposed chilled water pipe insulation on roof and other areas shall be provided with 24 gage aluminum cladding.2 m centers to prevent insulation from sagging. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Duct surfaces shall be cleaned and applied with one generous layer of Flinkote before application of insulation material. The mineral wool shall be fixed behind a 0. Hard wood half sectional inserts shall be used where the support clamps are fixed. Duct walls shall not be punctured when securing acoustic insulation. it shall be tapered and the aluminum lamination shall extend beyond the end of the insulation by at least 150 mm and securely taped to the duct. other approved adhesive may be used.14 Acoustic and Anti-vibration Requirements General This Section of the Specification sets out the minimum precautions to be taken to control sound and vibration levels throughout the building resulting from the operation of equipment provided under this Contract. The insulation shall be held by galvanized steel studs and clips. Vibrating mechanical equipment shall be mounted on vibration isolators to prevent 20 . 5 Class 150 Pressure/Temp. Plinth Mounted Roof Top Ventilations Fans – Plinth mounted ventilation fans shall be mounted on spring isolators on non-skid neoprene acoustical isolation pad. The noise level created by the air-conditioning and mechanical ventilation system throughout the normally occupied air conditioned area shall not exceed 40. Vibration isolators shall be submitted for approval.2. BUILDING SERVICES Thai Binh 2 Thermal Power Plant transmission of vibration and sound to the building structure. 20. ASME B16. The wall thickness stated below has already incorporated the required corrosion allowance. raised face Gasket ASME Class 150. Pipe DN 65 to DN 350 ASTM A 53/A 53M Grade B. sch 80 Fittings DN 65 and above to 37. ASTM A307 grade B galvanized and ASTM A563 grade B nuts. 20. Pipe finishes Sand blasted and 2 coats of primer Pipe DN 15 to DN 50 ASTM A 53/A 53M Grade B. Nuts and strap Hexagon-Head Machine Bolt.16 Valves Isolating valves shall be provided on piping services to each item of plant and equipment and on each main and sub-main.7 deg C.5. 3 mm thick Bolt.20.5 Class 150. 20 . In other areas. Equipment Mountings Ceiling mounted Fan Coil Units – These shall have spring hangers with neoprene pads at top and bottom. seamless. seamless. Sch 40 Fittings DN 50 and below ASTM A 234/A 234M screw. DN 65 to DN 600 long radius bend wall thickness to match pipe Flange for pipes Slip on flange. Careful attention shall be paid to rotating equipment for prevention of noise and excessive vibration.2.43/55 299003401. Limit 20 Bars at -10 deg C 16 Bars at 37. Sch 80.8 deg C to 93 deg C Nominal corrosion allowance 2 mm minimum. Neoprene.5.15 Piping Specification Piping material of the ACMV system shall comply as follow: Service Chilled Water Design pressure 10 bars for chilled water Nominal Rating ASME B16.doc . ASTM A 234/A 234M Butt end weld. galvanized. Sound attenuation devices shall be incorporated wherever required to achieve. the noise level created by the air conditioning and mechanical ventilation system shall be less than 45. in place of isolating valves shall be installed on return piping main branches to facilitate balancing of the system. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Drain cocks and vent cocks shall be provided where necessary on the dead side of isolating valves.20. Screwed valves shall have heavy hexagon reinforcements at openings. Valves and cocks shall be fitted so they are accessible for operation and maintenance. packing) shall be for the working pressures and also operating temperatures of the systems in which they shall be installed.doc . brass or bronze for valves up to 50 mm nominal bore and of cast iron for valves 65 mm nominal bore and above. They shall be of even thickness throughout. 20 . Double regulating valves. Holes in the valve bodies for spindles shall be machine-sealed to prevent water leakage. on branch mains and on items of plant in order to facilitate emptying the pipes. Valves and valve components (e. Valves shall be hydraulically tested to at least 1½ times the working pressures of the systems in which they shall be installed. Plugs for gland cocks shall be ground in and shall be operated by a loose key. Body castings of valves and cocks shall be gunmetal.44/55 299003401. clean and smooth and free from scale and flaws.g. threads of ample length. seats. and heavy shoulders to prevent over-entry of pipes or adaptors. single phase and all others shall be rated 400 V. raised face flanged. 20. raised face flanged. y-strainer. Class 150. antivibration mountings.doc . centrifugal flow fans. raised face flanged. The Contractor shall design. Class 150. non rising stem.45/55 299003401. bronze body. Cast iron body. Fans shall be individually controlled from starter switches and cabling from distribution boards to switches and fans shall be supplied by the Contractor. non rising stem. fresh and exhaust air grilles. axial flow. cast iron body. 20. silent check with bronze plate Strainer DN 15 to DN 50 Class 150. non rising stem. finned for efficient cooling). a fan casing. Class 150. y-strainer.20.2. Limit 20 Bars at -10 deg C 16 Bars at 37.6 Mechanical Ventilation System General The mechanical ventilation provided shall include propeller flow fans. cast iron body with tie-rods. Each shall comprise a direct-driven aerofoil cross-sectioned impeller. flexible connectors. valve chambers of approved size complete with cover shall be provided. stainless steel convolutions. an automatic non-return damper. Worm gear. raised face flanged. with electrical actuator For valves installed below ground. Class 150. supply and install acoustic internal insulation to the mechanical ventilation ductwork. Cast iron body. bronze body. a totally-enclosed squirrel-cage induction motor (of short length.6. cast iron body Flexible connector all sizes Class 150.1 Wall Mounted Supply and Extract Fans The fans shall be the silent running direct driven. where applicable.2. aluminum construction. three phase and as specified in Electrical Work Section. EDPM lined. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Valves used for the ACMV systems shall comply as follow: Service Design pressure Nominal Rating Chilled Water 10 bars for chilled water ASME B16. Fractional hp fans shall be rated 230 V.7 deg C. aerofoil type with nonoverloading characteristics.8 deg C to 93 deg C Gave Valve DN 15 to DN 50 Gave Valve DN 65 to DN 150 Globe Valve DN 15 to DN 50 Globe Valve DN 65 to DN 150 Check Valve DN 65 and above to 37. Parts of the fans shall be resistant to sea-water corrosion. single stage. Class 150. non rising stem. ductwork. bronze body Strainer DN 65 to DN 150 Class 150. protection guard. wafer type. acoustic insulation.5 Class 150 Pressure/Temp. grille and a curtain fire damper. 20 . raised face flanged. fire resistant and painted gray. raised face flanged. Cast iron body. raised face flanged. Butterfly Valve DN 80 and above Class 150. external louvers and equipment necessary for the efficient operation of the system. raised face flanged. e Bs 5501. 1980 or approved equivalent standard. The fan unit shall be mounted away from direct radiant heat which might cause excessive heating of the casing. fire resistant and painted gray.2. The fans. The Contractor shall be responsible to provide the cabling and termination from the fans to the SubFire Indicator boards. A venturi shaped inlet shall be provided and an inlet spigot fitted.46/55 299003401. Fan performance shall be tested in accordance with BS 848 Pt 1. Fans shall be individually controlled from starter switches and cabling shall be supplied by the Contractor. flanged and riveted/plug welded to the backplate and shroud. with the scroll plate seam welded to the volute sides. Prior to 20 .d or EX. complete with ductwork and grille shall be supplied in accordance with Specification and Drawings. The material.6. Fan casing shall be of mild sheet steel construction. Class ‘B’ winding insulation is acceptable for fractional power motors.6. operation and maintenance instructions shall be submitted prior to commissioning of the fan. Ex. Motor manufacturer’s installation. Discharge shall be flanged and bolting holes provided. exhaust air grilles and louvers and accessories to be used shall be in accordance with those specified under the appropriate sections of the air conditioning system. The fresh air fan shall be deenergized and exhaust fans shall operate in the event of a fire in the room. Impeller shall be manufactured from mild steel and be fitted to the fan shaft by a taper bush. Motors shall be enclosed. construction and installation of ductwork. 20.doc . Inspection door shall also be provided. Part 1 or approved equivalent standard). BUILDING SERVICES Thai Binh 2 Thermal Power Plant Fan motors for battery rooms shall be flame-proof type rated for 250 oC operation. Winding insulation shall be to Class ‘F’ specification. which shall be mounted to metal sheet ducts.3 Centrifugal fans The fan provided shall be compatible with the air to be handled and suitable to operate at the ambient conditions listed above. The standby fan for the Battery Room shall operate automatically when the duty fan fails. fan cooled squirrel cage induction type (or of flameproof enclosure standard. metal surfaces of motor and steel frame shall be given a protective coating of chlorinated rubber paint. as required. 20. The fan shall be substantially supported and all supported frames shall be provided by the Contractor. Impellers shall be dynamically balanced to ISO 1940:1973 and BS5265 Grade G6. Parts of the fan shall be resistant to sea water corrosion.3 or approved equivalent standard. parallel key and keyway. In mildly corrosive environment. The blades shall be straight backward inclined or backward curved. Side plates shall be of mild steel fabricated construction bolted to permit assembly to any standard discharge angle.2 Exhaust and Supply Fans with Ductwork Exhaust and supply fan systems. The fan shall be for the hazard classification of the area concerned. continuously rated and sized to BS 4999/5000 or approved equivalent standard.2.20. Installation: Motor and steel frame attached to the unit shall be kept out of contact with fumes which may give rise to corrosion formation. single speed or 2-speed. shall run at a speed below 1500 rpm. Fan size up to 250 mm shall have six blades. 20 . For three phase operation. Where recommended by the fan manufacturer. they shall deliver the specified flow rates and pressures when tested to BS 848 PT 1:1963 or approved equivalent standard. squirrel cage induction design. power motors of bulkier construction and thus restricting fan performance will not be acceptable. matched to fan duties for each size in order to achieve higher power factors and efficiency. or AMCA standard 210-74 or approved equivalent standard.S. finned for efficient cooling and airstream rated for continuous operation at the ambient conditions listed above. heavy gauge pressed steel for use in corrosive/aggressive environment and shall be statically and dynamically balanced to give maximum airflow per watt at minimum noise level. The design and manufacture of fans and quality of control standards used shall comply with B.70 kW and suitable for capacitor-start-andrun starting.S. 315 mm to 710 mm to have four blades and sizes 800 mm and above three blades. Insulation and rating shall be to BS 5000: Part 11 or BS 5000: Part 99 and BS EN 60034-1. or AMCA standard 300 or approved equivalent standard to within one standard deviation of 3. In-line centrifugal fans shall be installed in ducted systems as indicated. The impellers and motors shall be those designed as completely integrated units delivering guaranteed performance and electrically. 848: Pt. the manufacturer’s installation and commissioning instructions shall be submitted for reference. 20. For such duties. Instead fan manufacturer's own specially designed flameproof motor is preferred. Where flameproof motors are required. Single phase motors shall be preferred up to less than 0.6. anti-vibration mounts should be used as integral part of the fan installation. the fan should be sized for such installation and the Contractor shall ensure the necessary diaphragm plate shall match the duct section and at the same time accommodate the recommended opening required for the airflow/fan. Sound Power Levels shall be measured in accordance with B.S. BUILDING SERVICES Thai Binh 2 Thermal Power Plant installation. . For wall mounting. The impeller shall be directly coupled to the motor for efficient operation. motors shall be of Direct-On-Line starting type. Motors shall be of totally enclosed. 2. 5750 and BS EN ISO 9000 to BS EN ISO 9004 Quality Systems or approved equivalent standard. 848: Pt 1. The design and manufacture of fans and the quality control standards used shall comply with BS 5750 Quality Systems or approved equivalent standard.20.2.47/55 299003401. the start-and-run capacitors supplied with single phase fans should be sited outside the hazardous area if the capacitor boxes are not rated for such environment. in terms of power. aluminum construction.4 Propeller Fan The blades shall be made of hot-dipped galvanized. they shall comply with Exd requirements and are certified to BS 229 and BS 4683: Part 2 for Groups IIA and IIB gases and for Zone 1 and 2 working environments or approved equivalent standards.doc . standard flameproof. with protection to BS EN 60034-5 Group IP44 minimum or approved equivalent standard. Fans shall deliver the specified flow rates and pressures when tested to B. For motor enclosures to meet flameproof requirements. manufacturer supplied aerodynamically designed plastic bell mouth or steel ring mounting plate shall be provided to ensure the required airflow is achieved. For mounting within duct section. The Contractor shall be responsible for ensuring the fans shall be capable of delivering the required flow rates against the system resistance as well as that through silencers fitted. or approved equivalent standards or shall consist of sleeve joints with packing of non-combustible material.20.2. be provided in conjunction with the fan manufacturer. The silencers shall provide at least the following dynamic attenuation or insertion loss: Frequency (Hz) 63 125 250 500 1k 2k 4k 8k Attenuation 1 2 4 9 11 10 9 7 20. Flame retardant fabric connections shall be made of fiber glass cloth impregnated with lead loaded vinyl or other approved material. 20 . Flexible connections shall not be used for connections between ductwork and staircases pressurization or smoke stop lobby ventilation fans. Silencers. Silencers installed shall be of approved design and shall be manufactured to a fully developed design currently in production Construction Its casing shall be constructed of 1. In such cases flanged joints shall be used. The surface density shall not be less than 5 kg/m 3 Flexible connections shall be air-tight and shall have 25 mm to 50 mm length free of stress to permit renewal of fabric without disturbing ductwork or other part of equipment. Flexible connections shall be made of approved flame retardant fabric (possessing flame spread rating not exceeding 25 without evidence of progressive combustion and a smoke developed rating of not higher -than 50 as determined by 'Method of Test of Surface Burning Characteristics of Build ing Materials' NFPA No 255 ASTM E84 Underwriters' Laboratories Inc Standard). without overloading or exceeding the limits of the fan motors.9 mm thickness.6.6. in order to ensure both items of equipment are satisfactorily matched. shall where possible.5 Silencers General Silencers shall be provided for ventilation fans.48/55 299003401.2. They shall be of length not less than 100 mm and not longer than 250 mm between parts to be connected and shall have sufficient slack to compensate for free movement of equipment on vibration isolators.6 Flexible Connectors for Fans Flexible Connection Flexible connections shall be provided to isolate fans and other equipment from ductwork to prevent transmission of vibration.2 mm thick galvanized steel sheet and sound absorbent lining material of non-flammable glass fiber infill with a non-eroding facing material held securely in place behind perforated galvanized steel sheet of minimum 0. The pressure losses as a result of air flow through the silencers should be added to the static pressure requirements indicated for the associated fans given in the fan schedule. Flexible connections shall be provided on both suction and discharge side of fans.doc . BUILDING SERVICES Thai Binh 2 Thermal Power Plant 20. Performance Requirements Cylindrical silencers shall be tested by the method specified in BS 848 Part 2:1966 or approved equivalent standard. doc . 20. The impellers shall be of steel construction and the hub shall be of either steel or aluminum construction. 20.9 Shipping. pipe delivered to site shall be new. BUILDING SERVICES Thai Binh 2 Thermal Power Plant 20. rust.7 Roof Extract Fans Roof extract fans shall run at a speed below 1500 rpm. grease and colored banded to identify different grade. small power and lighting. Tags for the valves shall be provided and shall be of stainless steel with the identifying numbers and descriptions embossed or engraved. Cabling from the distribution board to switches and the fans shall by supplied by the Contractor. Storage And Tagging Equipment. free from scale. Fan body and cap shall be painted grey. The weather cap for the extract fan shall also be of flame retardant glass fiber reinforced resin. Concrete curbs around the openings and frames for curb mounting of the fans shall be provided by the Contractor.8 Instrumentation And Control A group fault alarm for each chiller air-conditioning unit shall be wired to the Common DCIS for monitoring as specified in Section 11. squirrel-cage induction type. The fans shall be curb mounted to opening in the building roofs.2. During Installation.2. If leakages occur. which is inclusive of sub-distribution board. single stage with non-overloading characteristics. The tags shall be securely and permanently affixed to the equipment with screws. and communication system. cleaned. Packing. corrosion and entrance of foreign matter during shipment and storage.2. direct driven.2. the Contractor shall undertake to repair and also to make good any damages at his own expense. 20 .6. The fan motor shall be mounted in a flame retardant glass reinforced resin body with an integral skirt for curb mounting.49/55 299003401. capped.7 Electrical System Electrical System. Both shall be protected against the effect of the sea water and acidic fallout from the chimney. 20. The motors shall be horizontally mounted. The motors shall be capable of continuous running in ambient temperature of 50°C Fans shall be individually controlled by starters on the control panel located within each building. Piping. shall be furnished in accordance with Section 9 of the technical specification. Each fan shall have automatic non-return shutters which open with the fan on and close with the fan off.20. the Contractor shall ensure that good workmanship is applied. valves and fittings shall be given acceptable industry standard protection to prevent damage. deburred. centrifugal flow. the totally enclosed. Equipment/material storage shall be under the Vendor’s scope. The fans shall be the silent running. The exact runs and locations of all pipes shall be determined by the Contractor on site and subject to approval. Cutting shall be done with approved cutters where practicable. In addition. Flange faces shall be machined and square with equipment centerline. Metal surfaces subject to corrosion shall be cleaned and painted. 20 . Interconnecting joints in carbon steel pipes shall be made by butt welding without the use of backing rings. Butt weld profiles shall be in accordance with ASME B16. Pipes shall be cut in a neat and workman like manner without damage to the pipe. particularly at the ends are clean. replacement and repair. A temporary stopper shall be provided to cover each open end of the pipes whenever work is stopped. Terminal screws. Where any equipment forming part of the installation is situated outdoor or subject to damp condition. the Contractor shall make good the coating.doc . Exposed non-current carrying metal parts of the cold water supply installation shall be effectively earthed. The Contractor shall supply the welding rods and inserts used for fabrication. the Contractor shall ship to site sufficient consumable insert material. In addition. corrosion or other deterioration. Pipes shall be installed clear of one another and arranged to provide easy access for maintenance and repair. Bolt holes shall be spot-faced for nuts. or requiring adjustment. studs. Approved lifting gear and slings shall be used at all times. Pipes and fittings shall be thoroughly cleansed internally before pipe laying and jointing. nuts and bolts shall be of the ISO Metric Thread Standards.50/55 299003401. Pipes shall be handled with care to prevent breakage or damage and shall ensure the inside of the pipes. beams and columns. Cutting of pipes and fittings with gas torch is not acceptable.20. Parts subject to wear. filler wire and electrodes for field welds.25. Valve chambers of approved design shall be provided for valves installed below ground level. floor slabs.10 Piping Installation and Workmanship General Pipe runs and locations indicated on the Drawings are approximate and are a guide to indicate the general runs and locations. Nuts and bolts shall be of hexagonal heads. the Contractor shall ensure no foreign matter is allowed to enter the pipes after laying and jointing. Equipment shall be lifted to avoid distortion or deformation. Where pipes are runs in parallel to one another or close to walls. such equipment shall be of weatherproof design and shall be housed in specially designed enclosure. Lifting lugs or eyebolts shall be used where provided. Earth continuity conductor shall have cross-sectional area of no less than that specified under local rules and regulations. BUILDING SERVICES Thai Binh 2 Thermal Power Plant 20. Pipe weld ends shall be to ASME Standards unless otherwise specified.2. Pipe ends shall be reamed to remove burrs. inspection or repair shall be accessible and capable of reasonably convenient removal. a minimum clearance of 50 mm shall be maintained between the pipes and between the pipes and all adjacent surfaces. Where the coating has been damaged by handling. Qualified riggers shall carry out slinging of equipment. glossy vinyl film with pressure sensitive (self-sticking) adhesive and it shall be for outdoor application in an acidic and tropical marine environment. floors and ceilings. Upon completion of the installation. The Contractor shall supply and manage water requirements and the expenses incurred due to tests and inspections shall be borne by the Contractor. the Contractor shall arrange in advance for an inspection. pipe shall be tested hydraulically in convenient lengths before being covered up. Water shall be forced into the pipes by a pressure pump fitted with a pressure gauge. When the specified pressure has reached. the test shall be considered satisfactory. if the pressure has dropped. The completed pipes and fittings shall be hydrostatically tested at 12. expansion joints.5 times the maximum service pressure for 2 hours whichever is greater. flexible connections. and field instrument.20. Product technical data shall be submitted for approval prior to the purchase and installation.doc . 20 . BUILDING SERVICES Thai Binh 2 Thermal Power Plant Electrodes. temporary piping service. shall leave the pressure gauge connected to the length of pipeline under test. and at the same time isolate the pump. when closed. branches and where pipes pass through walls. Testing Upon completion of installation. Flanges shall only be used for valves. Pipe markers shall be banded on both ends with arrow tapes of width not less than 50 mm width to show the flow or process direction of pipe contents. flushing and sterilization of the piping installation. The Contractor shall arrange at his own cost the supply of water and power for the testing. which. Air release cocks shall be provided wherever necessary. Welding materials shall be packed in moisture proof containers until required for use. Pipe markers and arrow tapes shall be of durable. Pipe Markers The Contractor shall supply and apply pipe markers and arrow tapes in accordance with the manufacturer’s instructions. the isolating valve shall be opened and the loss of water shall be determined by pumping into the mains a measured quantity of water sufficient to bring the pressure up again to the initial pressure. The testing apparatus shall be provided with an isolating valve. which shall be calibrated by accredited organization.5 bar or 1. At the end of that time. filler wire and consumable insert materials shall be selected to match the mechanical and chemical characteristics of the parent pipe. and adjacent to changes in direction. Pipe markers and arrow tapes shall be applied next to each valve. until the air is expelled from the pipeline and joints before pressure is applied. No covering up of installation shall be carried out unless it has been satisfactorily inspected and tested. dimensionally stable. If the loss of water so determined is at a rate less than 10 cc per mm diameter per km of pipeline for 30 minutes.51/55 299003401. and at intervals of maximum 12 m on straight pipe runs. the isolating valve shall be closed and remain closed for 30 minutes. corrosion and fouling.  Fouling of pipes and condenser internal surfaces by suspended solids and organisms.11 Water Treatment General The Contractor shall supply and install the equipment for a complete automatic water treatment of chilled water circuits and engage approved specialists to provide water treatment and analysis to control organic growth. Pipe markers’ legend of service shall be distinctly marked to identify each pipe and its destination. Water treatment shall be employed to prevent and minimize:  Scaling of pipes and condenser. Control Limits of Water Condition The water condition of the condenser water circuits shall achieve. silica or silicates. throughout the duration of the water treatment program. the following control limits (henceforth referred to as the contract control limits): Control Parameters Chilled Water/ Unit of Measurement pH Value 7–9 pH Total Hardness 0 – 400 ppm CaCO3 P Alkalinity 0 – 25 ppm CaCO3 M Alkalinity 0 – 300 ppm CaCO3 Iron (Fe+2) 0 – 0. by salts of hardness ions. The Contractor shall supply chemicals for testing and commissioning and operation of the installations in accordance with the contract.  Presence of algae.2 ppm Cu + 2 Chloride (CI-) 0 – 100 ppm CI- Total Dissolved Solids (TDS) 200 (Max) ppm Nitrites (NO2) 600 – 800 ppm (NO2) 20 . The application of non-chemical treatment technologies for water treatment is preferred.20.52/55 299003401.2. Where pipelines are located above or below the normal line of vision.doc . 20.  Corrosion of the system by oxygen or low pH. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Attention shall be given to visibility with reference to pipe markings. Multiple metering pumps and chemical dosage pots shall be provided for feeding the chemicals for each condenser circuit. The increased cost in the associated equipment shall be favorably evaluated in the context of increased operating efficiency and reduction in water consumption. the lettering shall be placed below or above the horizontal centerline of the pipe respectively. bacteria or fungi.2 ppm Fe + 2 Copper (Cu+2) 0 – 0. storage and handling of chemicals shall be in accordance with manufacturer's recommendation and shall comply with the practice and requirements stipulated by the relevant local authority. Eye washer and shower facilities shall be installed near the storage room. Inspection and Testing No covering up of installation shall be carried out unless it has been satisfactorily inspected and tested.12 Testing and Balancing (ACMV Systems) General The Contractor shall perform tests and balancing necessary to ensure the systems installed conform to the specification and that such tests are adequate to demonstrate the equipment will comply with the requirements of this Specification and meet the guarantees specified. The Contractor shall ensure the chemicals and the end products of the water treatment program do not have an adverse effect on the environment. The Contractor shall provide smoke test to the air-conditioning duct system and shall ensure there is no leakage in the air supply and return ducts.doc . 20 . Testing and measuring equipment shall be supplied by the Contractor and testing and balancing shall be carried out. The quantity of chemicals shall be delivered on a regular interval of not more than 3 months to the site to avoid deterioration of chemicals and excessive storage requirements and shall be sufficient for continuous water treatment of the systems for 3 months. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Control Parameters Chilled Water/ Unit of Measurement Total Bacteria Count 0 . Handling of Chemicals Packaging. 20. The Contractor shall arrange at his own cost the supply of power for the testing of the ACMV installation.20.53/55 299003401. The chemicals used for the treatment program and the methods used to feed the chemicals shall comply with the local health codes. A schedule of the type of tests. It shall be compatible and neutral to the pipe materials. Properties of Chemicals The chemicals used in the water treatment program shall have no detrimental effect on non-metallic materials such as rubber and epoxy anti-corrosive lining which may be used in the piping system.2.10 Per ml water Legionella Bacteria Zero per 10 ml Corrosion rate(by corrosion coupon test) Copper : Less than 3 Mile Steel : less than 5 mil per year Calcium Hardness 0 – 300 ppm CaCO3 Supply of Chemical The Contractor shall supply sufficient chemicals for the Defects Liability Period. The discharge of the chemicals into any sewer shall comply with the requirements stipulated by the local authority. proposed dates and durations shall be submitted for approval prior to the tests. and saw cut. static pressure reading and amps drawn and include the fan curve to indicate the running condition. The test log sheet shall include. The above test log sheet shall form the basis of the plant operator’s log sheet.54/55 299003401. The test log sheets shall present a clear and precise record of tests carried out during the commissioning of the project. temperatures and pump motor power rating.20. but not be limited to where applicable. and the set point of all safety control pressure-stats. control thermostats setting.doc . pressures.  Zone temperature reading  The testing records for the chilled/low temperature hot water piping. The Contractor shall carry out adjustments of air quantities and controls during this period to ensure areas are controlled as specified.13 Spares and Consumables One set of pulley and belt per different sizes shall be provided for Air Handling Unit. Test Log Sheets The Contractor shall submit full detailed test log sheets for inspection and approval.2.  Compressor commissioning data. Fixed dampers are to be set and the final position shown with a painted arrow. At 3-month intervals during the maintenance period. Other items of equipment shall be recorded and tested in a similar manner to that specified above so a true indication is given of the plant performance. Performance Test A performance test shall be carried out by the Contractor to show the system specified fulfils all requirements of the specification. The Contractor shall provide temperature and humidity recorders. the following data:  Fan type. 20. and differential and control reset if applicable. grilles and dampers shall be correctly adjusted to give design air figures as quoted unless otherwise directed. speed.  The commissioning data for the setting of the chiller set. including flow rate. including load limit demand relay and water thermostat settings. including control equipment. 20 . the Contractor shall test the air-conditioning system for maximum capacity and performance and tabulate the results of the tests. pressure settings. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Air Quantity Balancing Registers. The Contractor shall identify spares required during normal servicing and planned outages and recommend the spare parts to be included in the Schedule of spare parts. electrical.55/55 299003401. maintenance and acceptance testing of the potable water supply systems.doc . delivery to site. Besides. control and instrumentation work. installation. 20 . testing and commissioning. 20. manufacture. Potable Water Supply shall be designed for the following areas in the buildings:  Battery Rooms  Laboratories  Workshop  Toilets/Bath Rooms  Kitchen/Meal Hall  Water Jug locations  Emergency Supply to the CCW Head Tanks in Turbine Building The Electric Storage Water Heater shall be provided at the Bath Rooms.1 POTABLE WATER SYSTEM Potable Water Supply inside the building is specified in Section 20 of the Specification. The work covers the design. including associated civil.20. BUILDING SERVICES Thai Binh 2 Thermal Power Plant Spares shall be directly interchangeable with the corresponding parts installed under the contract and shall meet the requirements of the original specification. water jugs completed with water supply points shall be provided at strategically locations in the office area of the building. supply. The Electric Hot Water Dispensers shall be installed at Mess Room/pantries.