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WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB)
GENERAL SPECIFICATION FOR HVAC WORK
Name of work SUPPLY, INSTALLATION, TESTING & COMMISSIONING OF HVAC WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB) 1(a) The definition of terms used in these specifications shall be in accordance with IS:3615. 1(b) Site Information The tenderer should, in his own interest, visit the site and familiarize himself with the site conditions before tendering. For any clarification, tenderer may discuss with the Engineer-in-Charge. 1(c) Heat Load Calculations and Equipment Selection i) The tenderer should also give the above heat load calculations wherever required separately for the areas served by each Unit in a air conditioning / heating system. ii) The equipment selection shall be made on the basis of the above heat load calculations wherever required. 1(d) CONFORMITY WITH STATUTORY ACTS, RULES, STANDARDS AND CODES i) All components shall conform to relevant Indian Standard Specifications, wherever existing, amended to date. A list of such standards is appended in Appendix `B’. ii) All electrical works shall be carried out in accordance with the provisions of Indian Electricity Act, 2003 and Indian Electricity Rules, 1956 amended to date. 1(e) SAFETY CODES AND LABOUR REGULATIONS i) All the safety procedures outlined in the safety codes listed in Appendix-C shall be complied with. ii) In respect of all labour employed directly or indirectly on the work for the performance of the air conditioning contractor’s part of work, the contractor at his own expense, will arrange for the safety provisions as per the statutory provisions, B.I.S. recommendations, factory act, workman’s compensation act, and instructions issued from time to time. Failure to provide such safety requirements would make the tenderer liable for penalty for each violation. In addition the Engineer-in-charge, shall be at liberty to make arrangements and provide facilities as aforesaid and recover the cost from the contractor. iii) The contractor shall provide necessary barriers, warning signals and other safety measures while laying pipelines, ducts cables etc. or wherever necessary so as to avoid accident. He shall also indemnify IISER against claims for compensation arising out of negligence in this respect. Contractor shall be liable, in accordance with the Indian Law and Regulations for any accident occurring due to any cause. The department shall not be responsible for any accident occurred or damage incurred or claims arising there from during the execution of work. The contractor shall also provide all insurance including
WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB)
third party insurance as may be necessary to cover the risk. No extra payment would be made to the contractor due to the above provisions thereof. 1(f) WORKS TO BE ARRANGED BY THE DEPARTMENT Unless otherwise specified in the tender documents, the following works shall be arranged by the Department: i) Space for accommodating all the equipment and components involved in the work, ii) False ceiling and/or return air enclosure excluding return air duct wherever provided as required. iii) Power supply, Water supply and Drain points. iv) Masonry ducts within and outside the building for carrying pipe lines and cables wherever specified. v) Air-tight fire doors with minimum one hour fire rating for Air Handling unit rooms, fan rooms and other equipment rooms. vi) Water proofing of floors of packaged unit rooms. vii) Providing 15 amps power outlet within 2 meter reach of each single phase equipment at locations called for on air conditioning contractor’s shop drawings. viii) Providing wiring and earthing for sump pumps with pumps in plant room. ix) Making openings in the walls/ floors/ slabs or modification in the existing openings wherever provided for carrying pipe line, ducts, cables etc x) Providing sump pumps and necessary piping for drainage of packaged unit room at each level and other machine rooms located below ground level. xi) Disposal of condensate drain from fan coil units beyond the condensate drain riser. 1(g) WORKS TO BE DONE BY THE CONTRACTOR Unless otherwise mentioned in the tender documents, the following works shall be done by the contractor and therefore, their cost shall be deemed to be included in their tendered cost- whether specifically indicated in the schedule of work or not: - i) Foundations for equipments including foundation bolts and vibration isolation spring/pads, ii) Support columns and beams for cooling towers, iii) Suspenders, brackets and floor/ wall supports for suspending / supporting ducts and pipes, iv) Suspenders and/or cable trays for laying the cables, v) Excavation and refilling of trenches in soil wherever the pipes are to be laid directly in ground, including necessary base treatment and supports.
WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB)
i) Water supply shall be made available to the contractor by the Department free of charge at only one point for installation. Further extension if required shall be done by the contractor. ii) Water shall be made available by the Department free of charge in make up water tank near the cooling tower, AC plant room, AHU room, expansion tank, hot water generator, air washer, etc. as required for testing and commissioning. Further connection from make up water tank to cooling tower shall be carried out by the contractor and shall be separately measured & paid for as per contract. iii) Water analysis should be obtained of the water available at site and if required water softening plant may be provided. 1(j) DRAINAGE i) Drain traps in A.C. plant room, AHU room, Air washer room, hot water generator and near cooling tower shall be arranged by the department. ii) All drainage arrangements from the drain traps in the A.C. plant room, AHU room, air washer room, hot water generator room etc to the drain line shall be arranged by the Department as required. iii) Piping Connections from the equipment to the drain trap including providing valves at the drain points shall be done by the contractor. These items of work shall be separately measured and paid as per contract. 1(k) MACHINERY FOR ERECTION All tools and tackles required for unloading / handling of equipments and materials at site , their assembly, erection, testing and commissioning shall be the responsibility of the contractor. 1(l) COMPLETENESS OF THE TENDER, SUBMISSION OF PROGRAMME, APPROVAL OF DRAWINGS AND COMMENCEMENT OF WORK i) Completeness of the tender All sundry equipments, fittings, assemblies, accessories, hardware items, foundation bolts, supports, termination lugs for electrical connections, cable glands, junction boxes and all other items which are useful and necessary for proper assembly and efficient working of the various equipments and components of the work shall be deemed to have been included in the tender, irrespective of the fact whether such items are specifically mentioned in the tender or not. ii) Submission of program Within fifteen days from the date of receipt of the letter of acceptance, the successful tenderer shall submit his program for submission of drawings, supply of equipment, installation, testing, commissioning and handing over of the installation to the Engineer-in-Charge. This program shall be framed keeping in view the building progress. Items like ducting, piping etc. that directly affect the building progress shall be given priority.
WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB)
iii) Submission of Drawings The contractor shall submit the drawings to the Engineer-in-Charge as per para 1.18.2 for approval before start of work. iv) Commencement of Work The contractor shall commence work as soon as the drawings submitted by him are approved. 1(m) DISPATCH OF MATERIALS TO SITE AND THEIR SAFE CUSTODY The contractor shall dispatch materials to site in consultation with the Engineer-in- Charge. Suitable lockable storage accommodation shall be made available free of charge temporarily. Watch & ward however, shall be the responsibility of contractor. Program of dispatch of material shall be framed keeping in view the building progress. Safe custody of all machinery and equipment supplied by the contractor shall be the responsibility of the contractor till final taking over by the department. 1(n) CO-ORDINATION WITH OTHER AGENCIES The contractor shall co-ordinate with all other agencies involved in the work so that the work of other agencies is not hampered due to delay in his work. Ducting, piping, cabling or any other work, which directly affect the progress of building work, shall be given priority. 1(o) QUALITY OF MATERIALS AND WORKMANSHIP i) The components of the installation shall be of such design so as to satisfactorily function under all conditions of operation. ii) The entire work of manufacture/fabrication, assembly and installation shall conform to sound engineering practice. The entire installation shall be such as to cause minimum transmission of noise and vibration to the building structure. iii) All equipments and materials to be used in work shall be manufactured in factories of good repute having excellent track record of quality manufacturing, performance and proper after sales service. 1(p) CARE OF THE BUILDING Care shall be taken by the contractor during execution of the work to avoid damage to the building. He shall be responsible for repairing all such damages and restoring the same to the original finish at his cost. He shall also remove all unwanted and waste materials arising out of the installation from the site of work from time to time. 1(q) COLOUR SCHEME FOR THE EQUIPMENTS AND COMPONENTS i) Colour scheme for equipment like chilling unit, pumps, AHUs, cooling tower etc shall be as per manufacturer’s standard colour scheme. ii) The scheme of colour code painting of pipe work services for air conditioning installation shall be as per National building code and is indicated below: Description Ground colour Lettering colour First colour band Condenser water piping Sea Green Black French Blue Chilled water piping Sea Green Black Black Central heating piping Sea Green Black Canary Yellow
WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB)
Final Inspection & testing will be done by the Engineer-in-Charge or his representative as per details indicated in Specifications for HVAC works. 1(r2) Safety measures All equipments shall incorporate suitable safety provisions to ensure safety of the operating personnel at all times. The initial and final inspection reports shall bring out explicitly the safety provisions incorporated in each equipment. 1(r3) RUNNING IN PERIOD & DATE OF ACCEPTANCE i) After the installation work has been completed by the contractor, he will conduct tests and make adjustments as may be necessary to satisfy himself that the plant including low side equipments is capable of continuous running. There after he will offer to the department a running-in period of 7 days subject to a minimum aggregate of 120 hrs at his cost. The duty cycle of the plant during this running in period shall be same as that specified in the tender documents. In case of multiple compressor installations, all the compressors should be run by rotation. The plant will be operated and a log of all parameters will be maintained during this period. The contractor will be free to carry out necessary adjustments etc. during this period without stopping the plant. Record of inside conditions will be made during this period to check the same are as per NIT requirements. The plant will be said to have successfully completed the running-in- period, if no break down or abnormal/ unsatisfactory operation of any machinery occurs during this period. After this the plant will be made available for beneficial use. After the plant has operated without any major break down/ trouble and inside conditions are maintained as per NIT requirements for the above specified running in period, it shall be taken over by the department subject to guarantee clause mentioned below. This date of taking over of plant after trouble free operation during the running in period shall be the date of acceptance. ii) Any loss of refrigerant or oil during the running in period shall be made good by the contractor free of charge. iii) Capacity test of the chilling unit & other major equipments shall be carried out as and when conditions become stabilized as per instructions of engineer in charge. iv) Seasonal testing may be carried out as & when outside conditions become suitable. 1(s1) When the major seasonal test cannot be carried out on commissioning of the installation due to any reason not attributable to the contractor, the installation will he handed over to the Department for beneficial use after completion of successful running in test of 7 days subject to a minimum aggregate of 120 hours as per para 1(r3) above. The balance payment shall be released to the contractor on his furnishing a bank guarantee in the specified format from a scheduled bank for an equivalent amount. The bank guarantee shall be valid for a period of 6 months. However it will be extended till the successful completion of the major seasonal test. This bank guarantee shall be independent of the one furnished for performance guarantee. 1(s2) The following shall be considered major seasonal test for the purpose of the above payment terms: - a) Air-conditioning system : Summer or monsoon b) Central heating system : Winter
WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB)
c) ETAC : Summer 1(t) TENDER DRAWINGS, DRAWINGS FOR APPROVAL & COMPLETION DRAWINGS The drawings appended with the tender documents are intended to show the areas to be conditioned, space allotted for various equipments, tentative duct, cable and pipe routes. The equipments offered shall be suitable for installation in the spaces shown in these drawings. 1(t1) Drawings for approval on award of the work The contractor shall prepare & submit three sets of following drawings and get them approved from the Engineer-in-charge before the start of the work. The approval of drawings however does not absolve the contractor not to supply the equipments/ materials as per agreement, if there is any contradiction between the approved drawings and agreement. a) Lay out drawings of the equipments to be installed in various rooms such as plant room, AHU rooms, hot water generator room, cooling tower and other equipments. b) Drawings including section, showing the details of erection of entire equipments including their foundations, water basin for the cooling towers / air washers, etc. c) Plumbing drawings showing the layout of entire piping, dia & length of pipes, valves and isometric drawings showing connections to various equipment. d) Ducting drawings showing sizes, locations of dampers, grilles & diffusers. e) Electrical wiring diagrams for all electrical equipments and controls including the sizes and capacities of the various cables and equipments, f) Dimensioned drawings of all electrical and control panels, g) Drawings showing the details of all insulations and vapour barrier works, h) Drawings showing details of supports for pipes, cable trays, ducts etc. i) Any other drawings relevant to the work. 1(u) Completion Drawings Three sets of the following laminated drawings shall be submitted by the contractor while handing over the installation to the Department. Out of this one of the sets shall be laminated on a hard base for display in the A.C. plant room. In addition one set will be given on compact disc. a) Plant installation drawings giving complete details of all the equipments, including their foundations, b) AHU room installation drawings. c) Plumbing layout drawings including insulation giving sizes and lengths of all the pipes and the sizes and locations of all types of valves, and including isometric drawings for the entire piping including the pipe connections to the various equipments and insulation details wherever required.
WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB)
1(w) DOCUMENTS TO BE FURNISHED ON COMPLETION OF INSTALLATION Three sets of the following documents shall be furnished to the department by the contractor on completion of work:- a) Completion drawings as per Specifications for HVAC Works. b) 3 sets of manufacturer’s technical catalogues of all equipments and accessories. c) Operation and maintenance manual of all major equipments, detailing all adjustments, operation and maintenance procedure.
WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB)
BASIS OF DESIGN AND SCHEME
1 AMBIENT CONDITIONS
Outdoor Design Conditions The following design conditions have been considered. Season DBT (OC) WBT (OC) Summer : 43.3 23. (110 OF) (75 OF) Monsoon : 35 28. (95 OF) (83 OF) Winter : 7.2 5 (45 OF) (41 OF) Indoor Design Conditions: Summer / Monsoon DB : 24 + 1 Deg C (75 + 2 Deg F) RH : Less than 60% Winter provision for winter heating in few areas. 2 Design Data: Following design parameters are being considered for calculating the heat loads. Occupancy As per table 1 attached Lighting 1.5 Watts / Sqft (Fluorescent) Outdoor Fresh Air addition rate 1 ACPH Equipment load 100 WATTS PER Computer Area As per table 1 attached
- SYSTEM DESCRIPTION The proposed air conditioning system shall consist of Aircooled Packaged / ductable units. These units shall suitable capacity indoor units The outdoor units shall be connected with Indoor units thru heavy grade Refrigerant piping adequately sized. All motors for air-conditioning system shall be energy efficient type, suitable for 415 + 10% / 220+ 6% volts incoming power supply. Condensing units shall be placed on epoxy coated MS frames and provided with anti- vibratory supports. All foundations shall be protected from mechanical damage by providing epoxy coated angle nosing.
WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB)
TABLE 1
SUMMARY OF HEAT LOAD
Area Tonnage CFM Fresh air SqFt TR CFM CFM Ground floor Lecture Hall 1 1,495 11.15 4767 384 Lecture Hall 2 1,495 11.15 4250 384 Lecture Hall 3 1,495 11.15 4250 384 Lecture Hall 4 1,495 10.99 4185 384 Auditorium 5,380 46.97 17097 4353 stage 2,195 11.04 4361 804 First Floor Lecture Hall 5 3,843 27.
Lecture Hall 6 3,843 27.42 10360 1030 Total 21,243 157.
WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB)
DESIGN PARAMETRS
Given blow are some design parameters which should be followed in addition to those given in various sections of technical specifications enclosed DUCTABLES a) Maximum Face Velocity across cooling coil MPM : 152. b) Maximum Face Velocity across Pre filters MPM : 152. c) Maximum water pressure drop across coil in Mt : 4. d) Maximum water velocity through coil in MPS : 2. e) Fan outlet velocity (maximum) MPS : 9. f) Maximum fan speed (forward curved) : 1000 RPM g) Maximum fan motor speed : 1450 RPM DUCTING WORK a) Method of Duct Design : Equal friction method/ constant friction method b) Maximum Air Velocity in supply air duct : 450. c) Maximum Air Velocity in return air duct : 305. d) Friction loss in duct (max) MM wg in 100 Mt run : 10 e) Maximum Velocity at supply air grill outlet MPM : 150. INSULATION Maximum temperature rise in the supply air duct from Air Handlers outlet to farthest outlet 1.1Deg C
WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB)
IS:8544 (Part-I to IV)1979 Starters IS:9224 (Part II) - 1979HRC cartridge fuse links upto 650 volts. IS:3069-1965 Glossary of terms, symbols and unit relating to thermal insulation material IS:3346-1980 Method for the determination of thermal conductivity thermal I insulation materal ( two slab, guarded hot plate method) IS:3588-1966 Specification for electric axial flow fans IS:3724-1966 Specs for cartridge type heating elements (non embedded type) IS:4158-1967 Specs for solid embedded type electric heating elements IS:4691-1984 Degree of protection provided by enclosure for rotating electrical machine IS:4722-1968 Specs for rotating electrical machine IS:4729-1968 Measurement and evaluation of vibration of rotating electrical machine. IS:4831-1968: Recommendation on units and symbols for Refrigeration IS:4894-1987 Specs for centrifugal fans IS:5111 -1993 Testing of Refrigerating compressors. IS:6272-1971: Specs of industrial cooling fans IS:7616-1975 Method of testing panel type air filters for air conditioning and ventilation purposes IS;8623 1977 Specs of factory built switch / control section. IS:8623(Part3) 1993: Specs for low voltage switchgear and control gear assemblies IS: 8789- 1978 Values of performance characteristics for three phase induction motor IS-13947 (Part-1)1993Specs for low voltage switchgear and control gear. In case of any revision in above BIS code the REVISED one shall only be applicable.
WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB)
GENERAL MECHANICAL REQUIREMENTS
1 This chapter deals with the general mechanical requirements specifically applicable to HVAC. The additional requirement given in any chapter is in addition to the bare minimum stated in this chapter and shall be complied with. 2 SUBMITTALS Under provisions of the NIT sample approval for all major items like grills, diffusers, valves, insulation, sheet etc is necessary before the commencement of the project. The products mentioned in the Approved list of manufacturers shall only be acceptable. In case of any alternate make is required to be used the same will have to be approved by the customer/engineer in charge with proper quality and rate justification as per the mode of approval mentioned in the list. Shop drawings and product data grouped to include complete submittals of related Systems, products, and accessories in a single submittal. Shop Drawings shall be based on the actual duct routes after the site survey, details of concrete pads and foundations for the various equipments, Layout of the AHU including dimensions of the room / boxing with inspection window dimensions, the foundations and the sizes and all necessary construction details required on site, location of the allied equipments and the requirements from other agencies, trench locations if any, Sump location and size, sleeve location if any, fresh air / exhaust air locations, location of wall mounted equipment (If any) and any structural inputs. 3 BROCHURES Submit manufacturer’s product data and brochure including complete description of the item with illustrations, rating charts, accessories, dimensional data, capacities stated in the terms specified in the NIT and Performance curves, wherever applicable like fans and pumps. 4 REGULATORY REQUIREMENTS Liaison / Approvals from the bodies mentioned below (or any other), if required shall be taken by the contractor on behalf of the client and at his own cost. BIS / Local Fire Authority / LOCAL CODES. 5 PROJECT / SITE CONDITIONS
- Mechanical layouts indicated on drawings are diagrammatical. Co-ordination (final) shall be required with other trades prior to installation. Install all works as shown on the drawings, unless prevented by project conditions.
- Prepare drawings showing proposed rearrangement of work to meet the project conditions. Obtain permission from of engineer in charge before proceeding.
- Place anchors, sleeves and supports prior to pouring concrete on installation of masonry works.
WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB)
AIR COOLED PACKAGE AIRCONDITIONERS SYSTEM
1. SCOPE
The scope of this section comprises of the supply, erection, testing and commissioning of Air cooled Package machines conforming to specifications given hereunder and in accordance with the requirements of drawings and schedule of quantities. 2 TYPE The Package Units shall be complete with multiple SCROLL compressors, blower & motor assembly, condensors, cooling coils, interconnecting refrigerant piping, control panel, controls and internal wiring and shall be enclosed in an attractive cabinet. 3 CAPACITY Actual refrigeration capacity of Package Units shall be as given in schedule of quantities. 4 COMPRESSOR The compressor shall be for heavy duty specifically designed for high head pressures. Compressors shall be of SCROLL, Hermetically sealed with gas cooled motor. The motor and compressors shall be enclosed in a single Hermetic casing. The compressor shall be suitable for R-22 refrigerant and shall be mounted in the indoor units. 5 CONDENSORS Condensor shall be of air cooled, fitted with integral finned copper tubes of 12 mm O.D. Condensor shall be manufactured to ASME code for unfired pressure vessels. Working pressure for refrigerant side shall be for refrigerant used. Condensors shall be complete with the following accessories:
- Hot gas inlet connection, liquid outlet connection, relief valve, purge valve, fusable plug, air vents etc. Shall be salt sprayed.
- Any other standard accessories necessary for equipment supplied. 6 COOLING COIL The cooling coil shall have copper tubes of not less than 1/2 “ O.D continuous Aluminium plate fins. The tubes shall be staggered in the direction of the Airflow. Suitable cleanable air filters shall be provided before the coil.
- FAN SECTION The fan Section shall consist of Forward curved fans, complete with scrolls, shaft and self-aligning bearings, fan motor mounted on flexible supports and adjustable speed drive. The units shall be complete with Cooling Thermostat, reset relay, Hi-Lo pressure cutout, Expansion valve and other necessary controls / safety devices. The various components shall be interconnected by copper refrigerant pipes, fittings and
WORK AT LECTURE HALL BUILDING OF IISER, MOHALI (PB)
valves. The suction line shall be suitably insulated. The unit shall be complete with required charge of refrigerant gas and Lubricating oil. The Units should be complete with factory manufactured control panel housing the starters, safety control relays etc. the various electrical components shall be neatly prewired at the factory requiring only main power supply from external source. All components listed above shall be enclosed in Factory built Sheet Metal cabinet. The cabinet shall be divided in Compressor section, Cooling coil section and Fan section. The whole cabinet shall be insulated with 25 mm insulation. It shall have suitable openings for Fan outlets, return air grille etc. 8 TESTING Equipment capacity in Tons of refrigeration shall be computed from the temperature readings. The computed results should tally with the specified capacities. All instruments, services needed for the tests required shall be furnished by the contractor. 9 PAINTING All the equipment including mounting frame shall be painted with two coats of approved enamel paint.
