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JCL CONSULTANTS LTD TECHNICAL SPECIFICATION for AIR-CONDITIONING & MECHANICAL VENTILATION SYSTEM INSTALLATION at Saigon Pearl Development at Nguyen Huu Canh Street Ward 22, Bink Thanh District Ho Chi Minh City, Vietnam Prepared by: JCL Consultants Ltd. 16C Seabright Plaza, 9 Shell Street, North Point, Hong Kong (479m 19/12/05) JCL CONSULTANTS LTD Job No. 479-M 19 December, 2005 SPECIFICATION FOR AIR-CONDITIONING AND MECHANICAL VENTILATION INSTALLATION TABLE OF CONTENT ================== 1.SCOPE OF WORK 2. GENERAL REQUIREMENTS 3.PRODUCTS AND WORKMANSHIP A. Water Cooled Chillers B. Air Cooled Split Air-conditioning Units C. Pumps and Cooling Towers D. Fan Coil Units, Air Handling Units and Ventilation Equipment E. Pipework, and Fittings F. Ductwork and Fittings G. Thermal Insulation H. Acoustic and Vibration Isolation I. Automatic Control Systems J. Electrical Wirings K. Miscellaneous Provision 4. TESTING/COMMISSIONING, LABEL, PAINTING, MAINTENANCE AND SPARES 4.1 Testing and Commissioning 4.3 Painting 4.4 Maintenance and Spares 5. DRAWING LIST INFORMATION TO BE SUBMITTED BY TENDERER I.SCHEDULE OF MATERIALS/EQUIPMENT II.SCHEDULE OF QUANTITIES AND UNIT RATES III.SUMMARY OF TENDER I. SCHEDULES OF MATERIALS/EQUIPMENT II. SCHEDULES OF QUANTITIES AND UNIT RATES III. SUMMARY OF TENDER (479m 19/12/05) JCL CONSULTANTS LTD SPECIFICATION FOR AIR-CONDITIONING AND MECHANICAL VENTILATION INSTALLATION 1. SCOPE OF WORK 1.1 Supply and install the complete air-conditioning and mechanical ventilation installation in accordance to the drawings and specifications, including:- a. Chilled water and condensing water systems including chillers, cooling towers, pumps, chilled water/condensing water circulating pipework, valves, controls, feed and expansion tanks, etc. b. Split-type air-cooled A/C units for the building including all indoor units, outdoor condensing units, refrigerant pipe, condensate pipes and controls. Metal trunking shall be provided for refrigerant pipe whenever exposing to sunlight/outdoor. c. Complete air distribution system including fan coil units and air-handling units. d. All supply air ducts and fittings including manual and motorized volume control dampers, fire dampers etc. e. Central fresh air supply system including air-handling units, ductwork and controls. f. Supply / exhaust air and ventilation system for carpark (including CO monitoring system), lavatories and mechanical/electrical rooms including propeller fans, axial fans and/or centrifugal fans. g. All thermal insulation associated with the ACMV installation. h. All acoustic work including silencers and vibration isolators associated with the ACMV installation. i. Pressurization system for staircases and buffer rooms of residential towers. j. Water treatment system for chilled water and condensing water system. k. Electrical installation commencing from and including the Motor Control Centre for the chillers, chilled water pumps and air handling units. Electrical installation shall include all conduits/wirings, cable trays/trunkings, starters and control for each equipment. l. Automatic electrical control system including thermostats, control valves, control wirings and other necessary equipment/accessories. m. Others ancillary items for the complete execution of the job:- - The supply and installation of sleeves through structural and non-structural walls, floors for the pipework, electrical work and duct penetrations with fire rated material back sealing . - Provision of all steel beams, steel brackets, holding down bolts, spigots, etc. for the erection of the ACMV equipment and pipework. - Provision of overflashing of all penetration, sealing and making good of same. - Provision of fire rated ducting as required and indicted on the drawings. (479m 19/12/05) 1 JCL CONSULTANTS LTD 1.2 The scope shall also include the following items of work for the complete and proper execution of the contract:- a. Submission of shop drawings and samples. b. Painting of materials/equipment. c. Testing and commissioning. d. Provision of twenty-four (24) months operational maintenance and breakdown services. e. Provision of 3 sets of operation/maintenance manuals and as-fitted drawings including electronic files in AutoCAD 2004 format The as-fitted drawings shall include the complete installation layouts and schematic diagrams. f. Provision of spare parts for 2 years. 1.3 Responsible for application to Project Manager / Authorities for all testing and inspection of the electrical installation if required. All electrical installation under the scope of this contract shall be designed, installed, inspected and tested in accordance with the specification specified in Electrical Package. 1.4 Responsible for application to Fire Protection Department for all testing and inspection of the ventilation system installation if necessary. 1.5 Setting out and supervision during construction to the works executed by the main contractor and/or by other contractors related to the ACMV works:- a. Construction of riser air ducts. b. Holes sleeves reservation. c. Any plinth and inertia block for ACMV equipment. 1.6 Responsible for training of Employer’s staff for the proper operation of the entire ACMV system. 1.7 Associated Work for ACMV Installation The following works associated with ACMV installation shall be provided by others under the building contract and other M & E services contract. a. Works Provided Under the Building Contract - Concrete plinth and inertia block for ACMV equipment. (However, the ACMV Contractor shall furnish operating weights and relevant structural loading information to Project Manager for calculation and placement of reinforcement.) - External wall louvres. - Enclosure or suspended ceilings of adequate fire resistance for housing air ducts and pipe runs through protected areas. (479m 19/12/05) 2 JCL CONSULTANTS LTD b. Works Provided Under Electrical Contract Electrical power supply for the following ACMV equipment up to the main isolating switch for each equipment:- - Fan coil units. - Ventilation fans. - Split A/C indoor units. c. Works Provided Under the Hydraulic Contract - Water supply to make-up water system for chilled water and condensing water system. - Flashing for all penetrations. d. Works Provided Under the Fire Services Contract - Interface between the fire indicator panel and the carpark exhaust fans and the staircase pressurization fans complete with control switches and status indications. 2. GENERAL REQUIREMENTS 2.1 All works and materials to be used shall comply with requirements, regulations, standard and codes of the following parties:- a. The Building Department. b. The Water Authority. c. Environmental Department. d. Fire Protection Department e. Electrical Engineer 2.2 All equipment and materials delivered to site shall be brand-new complete with manufacturers’ labels and specifications. 2.3 Power Supply Power supply for the project shall be 380V, 3-phase, 50Hz ± 5%. 2.4 Temperature & Humidity Required In Club House & Apartment Area Temperature = 24 ± 2°C R.H. = 65% The Contractor shall ensure the specified condition can be achieved. 2.5 Shop Drawings (479m 19/12/05) 3 JCL CONSULTANTS LTD Prior to commencement of installation, the Contractor shall submit shop drawings showing details of equipment / piping layout, methods o construction / fixings and builders works for the ACMV installation to the Project Manager for review and approval. Shop drawings are to include :- a. Schematics and schedule b. Plans (minimum in 1:100 scale) c. Sections and elevations (minimum in 1:50 scale) d. Details (minimum in 1:25 scale) 2.6 Co-ordination Between Trades The Contractor shall liaise with other Contractors and tradesmen who will be carrying out other services work on the site, prior to the commencement of actual installations, so as to ensure that the work of all trades will be co-ordinated. The Contractor shall note the restricted space available in certain service ducts and the absolute necessity to ensure that all installation is carried out in the correct sequence, manner and position to facilitate proper operation and maintenance. During the preparation of shop drawings, the Contractor shall liaise closely with other contractors to ensure complete co-ordination of services installed by all parties. Maximum headroom and minimum installation space shall be maintained at all points. Where headroom or space conditions appear inadequate, the Project Manager shall be notified before proceeding with installation. The Contractor shall make reasonable modifications in the layout as needed to prevent conflict with work of other trades for the proper execution of work. The Contractor shall include all necessary bends, tees and the like to divert pipes, conduits, ducts to avoid structural obstacles and any other electrical and mechanical services installations to reach the designated locations. Prior to commencement of work, the Contractor shall be responsible to verify all levels and gradients shown on drawings and to ascertain that condition on site permit execution of work as shown on drawings. The Contractor shall be responsible for the timely installation and coordination with the General Contractor for the installation of any ducting, conduiting, sleeves or any other materials relating to the ACMV system that are required to be cast into slabs or the like. 2.7 Submissions The Contractor shall carry out submission for the Project Manager’s approval for equipment and examination of shop drawings in a timely manner according to the main construction programme. The submission programme shall include the following details: a. Proposed submission dates. b. Proposed dates for approval by Project Manager to meet the delivery schedule or installation programme. The Contractor shall include the cost of the submission of the drawings and equipment to all relevant Authority for approval, if required. The Contractor shall also allow for any additional cost for the laboratory testing of equipment if required by relevant Authorities. (479m 19/12/05) 4 JCL CONSULTANTS LTD 2.8 Mock-up Installation The Contractor shall allow the cost of installation of mock-up installations on site inside pipe ducts and other critical areas as directed by the Project Manager. 3. PRODUCTS AND WORKMANSHIP A. Water Cooled Chillers PRODUCT A101 GENERAL 1. Water-cooled chiller (of not more than 0.8KW/TR) offered shall be single unit which is completely factory-assembled, piped, leak tested, wired and charged with refrigerant (R134a of zero ozone depletion). It shall include but not limited to compressor, hermetic motor, chiller, water-cooled condenser, refrigerant control centre, purge unit, starter, controls, refrigerant piping and control, and watertight equipment cabinet, all mounted on a continuous structural base. The capacity and performance rating are specified in equipment schedule which shall be nett after derating due to location and site restriction etc. 2. All factory applied acoustical and thermal insulation, including facing and adhesives shall be fire-resistant and conform to requirements of NFPA and local codes. 3. Where corrosion can occur appropriate corrosion resistant materials and assembly methods must be used including isolation of dissimilar metals against galvanic interaction. 4. Locate and arrange motors, belts, filters, coils and other components and accessories so that they are accessible for repair, maintenance and replacements. A102 CASING 1. Construct of heavy gauge industrial type galvanized steel panels. 2. Bonderize each panel to remove grease and dirt after fabrication. 3. All metallic part shall be treated and painted with primer and paint to resist atmospheric corrosion. Coating system shall be UL approved. 4. Screws shall be cadmium plated or stainless steel. 5. Panel shall be of interlocking design and the base shall be related be raised to prevent water from entering unit. 6. Securely bolt panels and reinforce in critical areas to form a rigid and durable structure. 7. Fabricate structural frame with members rigidly braced to hold all parts in line and to prevent any change in shape when operating. 8. Structural frame shall be of welded construction with slag and splatter removed after welding. (479m 19/12/05) 5 JCL CONSULTANTS LTD 9. Paint welds with two coats of an approved primer, followed by two coasts of chemical resistant paint. (479m 19/12/05) 6 JCL CONSULTANTS LTD A103 SCREW COMPRESSOR, HERMETIC TYPE 1. Screw compressors shall have quiet operation with oil injection lubrication system. Open compressors shall have a rotary seal fitted to the driving shaft which effectively prevents leakage of refrigerant or oil. Hermetic compressors shall be driven through a flexible coupling of a type which enables the shaft seal to be removed without moving compressor or motor. 2. A device shall be fitted to prevent the pressure differential across the compressor causing backward rotation at a normal or emergency stop. 3. The lubrication system shall be arranged with an interlock to ensure adequate oil pressure at all bearings before the compressor starts. A hand reset pressure or flow switch for stopping the compressor shall be fitted at an appropriate location from the oil pump delivery pipe to the oil sump. A replaceable or thermostatically controlled oil cooler shall be used to remove the heat gained by the oil in the rotor chamber or the chiller manufacturer shall select and confirm that the lubrication oil used can be operated at a temperature higher than the rotor chamber. The oil sump shall have a thermostatically controlled electric heater which operates while the compressor is at rest. 4. The compressor shall have automatic capacity control equipment which will control at any point between 10% and 100% of full duty via control of the compressor speed by variable speed drive or slide valve. For compressor with stepped capacity loader control, each chiller shall have capacity control steps and the minimum step capacity shall be maximum 20% of full load. The compressor shall be fitted with a device which ensures that it cannot start unless in the fully unloaded condition. Unless otherwise specified , the hot gas by-pass or injection system of capacity control will not be accepted. The motor of a semi-hermetic compressor which is refrigerant gas cooled shall have built-in protection against inadequate cooling. The following fittings shall be provided and connected:- a) Stop valves on refrigerant discharge and suction. b) Refrigerant pressure gauges . c) Oil pressure gauge . d) Oil sum or reservoir level sight glass. e) Pressure safety cut-outs . f) Low oil pressure or flow switch with hand reset. g) High oil temperature cut-out with hand reset. h) Instrument mounting. i) Liquid line filter drier. j) Liquid line solenoid valve. (479m 19/12/05) 7 JCL CONSULTANTS LTD k) Refrigerant charging valve. l) Discharge line sound reduction kit. Alternatively, pressure measurements read form the display of the chiller is acceptable. A104 WATER COOLED CONDENSER, SHELL AND TUBE (FRESH COOLING WATER APPLICATION) 1. Condensers shall be of the manually cleanable type capable of being re-tubed ‘in- situ’. 2. For fresh water condenser cooling applications, the condenser shall be of steel and the water boxes/end covers shall be of steel or cast iron. 3. The tubes shall be of copper, aluminimun brass, cupro-nickel, grade 316 stainless steel or tube plates stainless 316 to ASTM A240/A240M or as otherwise indicated in the Specification. The tube plates may be of the same alloys or alternatively made in mild steel with a ‘Cladding’ of stainless steel. 4. Internal baffles and other fittings in either water or refrigerant circuits shall be made of material such that they will not corrode or set up corrosion or permit electro-chemical action with the liquids and/or other materials used in the condensers. 5. End water boxes shall be designed to provide adequate space for water movement such that there is no erosion of the tube ends. In general, this requires the water box end to be domed rather than flat. The water boxes shall be epoxy resin coated internally to prevent corrosion. 6. End box covers shall be removable, and allow easy access for cleaning the tubes. Means shall be provided for venting and draining of the water side of the unit. 7. The design fouling factor on the water side of the tubes shall be 0.000044 m 2 °C/W for cooling tower fresh water. A105 EVAPORATOR 1. Evaporator shall match with all other components for cooling requirements and performance. 2. Evaporator shall be direct expansion shell and tube type. 3. Evaporator outer shell and suction line insulated with minimum 50mm thick flexible closed cell plastic insulation or 100mm fibre glass insulation. 4. Maximum water velocity shall not exceed 2.5 metre per second. 5. Refrigerant side shall be designed as per ASME Code for pressure vessels of the unfired type for the refrigerant used. 6. Water side and water box shall be designed for 1000 kPa working pressure and 1500 kPa test pressure. 7. Evaporator shell construction shall be such that the tube bundle may be removed and/or cleaned without dismantling and pipe work. (479m 19/12/05) 8 [...]... fitted with factory wired terminals for the remote connection of all alarm functions, set point and start-stop switch (479m 19/12/05) 10 JCL CONSULTANTS LTD 5 Arrange belt guards to permit the use of tachometer, oiling and testing with the guards in place 6 The unit shall be pressure tested, evacuated and fully charged with refrigerant and an initial oil charge An operational test shall be performed... deflection 2 The Contractor shall fit equipment and appurtenances into the space provided and ensure that the equipment is readily serviceable 3 The Contractor shall provide all support beams, legs, hangers, anchor bolts, vibration isolators, ductworks, and silencers for the proper installation of the units as recommended by the manufacturer and shown on the drawings 4 The Contractor shall provide wire guards... 25mm thickness is to be fitted over the connections and enclosed in aluminium foil 5 After installation, adjust fans to operate without noticeable vibration 6 Arrange belt guards to permit the use of tachometer, oiling and testing with the guards in place 7 Install test wells made up of a brass nipple welded into the duct or casing on the downstream side of each fan and filter section 8 Install separate