Tender Specifications HVAC

8/10/2019 Tender Specifications HVAC

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AYURSUNDRA HEALTHCARE PVT. LTDAT GUWAHATI

HVAC Consultant Harvex Consultancy Services, Delhi - 110092, Tel No. 011- 45104461

TENDER SPECIFICATION

CONTENTS

HCS-166

Section Page No.No. From To

1 Terms & Condition

a) Special Conditions for submission of

Tender HVX-01A

b) Appendix to the conditions of the contract HVX-01B

2. High Side Equipment Specification

a) Standard Specification of Water Cooled HVX-02AScrew Chilling Machine

b) Standard Specification of Pumps Sets HVX-02B

c) Standard Specification of Cooling Tower HVX-02C

d) Standard Specification of Hot Water Generator & HVX-02D

Humidification System

4. Low Side Equipment Specification

a) Standard Specification of Double Skinned Air HVX-03A

Handling Unit & HRW

b) Standard Specification of Fan Coil Units HVX-03B

c) Standard Specification of Control System

for Air Handling Units. HVX-03C

e) Noise & Vibration Controls HVX-03D

g) Standard Specification of Air Circulation HVX-03E

System

f) Standard Specification of Thermal / Acoustic

Insulation HVX-03F

h) Standard Specification of Electrical Motors HVX-03G

& Statrers.

i) Standard Specification of Motor Control Center,


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Sub-Panels, Power & Control Cabling HVX-03H

j) Standard Specification of Piping Work HVX-03I

k) Standard Specification of Fire Damper HVX-03J

l) Modes of Measurement HVX-03K

m) Painting Work HVX-03L

n) Performa of weekly progress report of site HVX-03M

o) Inspection & Testing Procedure HVX-03N

p) Performance Test Readings HVX-03O

q) Standard Specification of Supply &Exhaust HVX-03P

Air Blower

4. Scope of Design

a) Basic of Design & Scheme HVX-04A

b) Design Parameter HVX-04B

c) Schedule of Equipment HVX-04C

d) List of Approved Make of Equipment HVX-04D

/ Material

e) Standard Specification HVX-04E

f) Technical Data Filled by AC Contractor HVX-05F

f) Bill of Quantities HVX-05G

5. List of HVAC Layout Plans

a) HVX/278/01- 05 AC Layout & Mechanical Ventilation Layout Plan all Floors

END OF SECTION HVX-00


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SECTION HVX 01A

SPECIAL CONDITIONS FOR SUBMISSION OF TENDER

Subject: Centralised Air-Conditioning & mechanical Ventilation System for Ayursundra Healthcare

Pvt. Ltd at Guwahati.

It is proposed to supply, install, test and commission Air-conditioning system of 630 TR capacity as per

Bill of Quantities given in the Section HVX-05G of the tender document at the above premises.

1. The Air-conditioning System shall comprise of:

Water-Cooled Screw Chilling Machines, Chilled Water (Fixed Flow) Pump Sets, Condenser WaterPump Sets, Double Skinned Air Handling Units, Hot Water Generator, Piping & Valves, G.I Ducting& Aluminium, Aluminium Grills / Diffusers, Insulation, Electrical Works, etc.

a) Sealed tenders in duplicate are invited for air conditioning of above of the above said job.

b) Tender in duplicate shall reach the office of the -------------------------------------- on or before 15.00 Hrs on ----------------.

2. SHOP DRAWINGS.

On the award of the work, the Contractor shall immediately proceed with the preparation of detailed

working drawings showing the detail of the equipment that are to be installed and the ancillary works that

are to be carried out.

Three sets of all such working drawings dully signed by the head of the planning & design department shall

be submitted to the Owner / Consultant / Architect for approval to ensure that the works will be carried out

in accordance with the specifications and drawings, including such changes as may have been mutuallyagreed upon. All the drawings shall be received by the Owner / Consultant / Architect for approval within

04 (Four) weeks of the award of work. The approval of the drawings by the Owner / Consultant / Architect

shall in no way relieve the Contractor form his obligations to provide a complete and satisfactory plant

installation, testing and commissioning as per intent and purpose as laid down in the specifications.

Any omissions and / or errors shall be made good or rectified whether or not the drawings are approved.

Contractor shall obtain written approval for samples (like grills / diffusers) and other materials before

placing the order. Contractor shall guarantee the specified inside conditions at specified outside conditions.

Prior to the completion of the work, the contractor shall furnish to the employer (4) four sets of a

comprehensive manual, describing all components furnishing a list of spare parts and setting forth in details

the instructions for the operation and maintenance of the plant.

The Contractor shall also fix in the plant room, neatly typed and framed, instructions in details, for the

starting and running of the plant.The following shop drawings shall be prepared by the AC contractor for approval-

a) AC Plant room layout plans with sectional drawings.

b) Schematic chilled water piping drawings.


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c) Duct layout plans of all floors including AHU rooms

d) Electrical panel, sub panels, power & control wiring drawings.

e) Foundation details of all equipments.

f) Any other shop drawings necessary for the project.

At the completion of work and before issuance of certificate of virtual completion the contractor shall

submit three (03) sets to the Engineer-in-charge, layout drawing drawn at appropriate scale indicating the

complete HVAC system as installed.

4. INSTRUCTION / MAINTENANCE / OPERATION MANUAL

The Contractor shall prepare and produce instruction, operation and maintenance manuals in English for

use, operation and the maintenance of the supplied equipment and installations, and submit to the Owner(03) three copies at the time of handing over. The manual shall generally consist of the following:

a) Description of the Project.

b) Operating instructions.

c) Maintenance instructions including procedures for preventive maintenance.

d) Manufacturers catalogues.

e) Spare parts list.

f) Trouble shooting charts.

g) Drawings.

h) Type and routine test certificates of major items.

i) One (1) set of reproducible as built drawings.

5. PRICES, UNIT RATES & DUTIES ETC.

5.1 The prices and unit rates quoted by the bidder in the bid shall be firm and deem to be adequate to cover the

entire responsibility involved in the execution and completion of work. The rates shall be complete in allrespects including cost of materials, erection, fabrication, labour, supervision, tools and plant, transport,

contingencies, breakage, wastage, sundries, scaffoldings, insurance etc. on the basis of works contract.

5.2 The contract value shall be inclusive of custom duty, CVD etc on Imported Equipments (Imported Fans ForAHU, Motorised Valves With Actuator, Fire Damper Actuator etc. except Water-cooled Chillers) & also

inclusive of excise duty & inclusive of local sales tax on indigenous Equipments / Materials and inclusive

of octroi, VAT duty or any other duties or fees levied by government or any public or local bodies.


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Please indicate separately the assessable value & quantum / rate of excise duty included on each excisablerefrigeration equipment separately in your price bid.

Please note that LC for imported chiller shall be opened by the client directly & duty shall also bepaid by the client. The AC contractor shall include the cost of installation, testing, commissioning of

chiller, port clearance, freight from Delhi port to site, lifting of chiller to terrace in the plant room,insurance up to commissioning at site etc. as required in Indian Rupees.

1 US $ Exchange Rate = Rs.55.0

5.3 The contract value shall remain firm during the currency of the contract and shall be subject to statutoryvariation in sales tax on works contract or on rate of custom duty / excise duty applicable on refrigeration

equipments only. In case assessable values are increased by the manufacturer of refrigeration equipment

during the currency of contract, the client shall not pay any increase in quantum of excise duty on account

of change in assessable value. No increase in prices due to change of rate of excise duty on bought out

items such as G.P / Aluminium sheet, M.S. angles / flats, motor, pumps, cables, controls etc., shall be paid.

No increase due to change in daily wages of labour be paid, due to any reasons whatsoever.

5.4 The total contract price quoted by the bidders shall be inclusive of works contract / turnover tax ifapplicable & shall be deducted by the Client at source & certificate shall be issued for the same. The works

contract price quoted shall remain firm till completion of job and handing over the same in working

condition to the client.

5.5 The price should not be subject to exchange rate variations. No foreign exchange and license shall bearranged by the Client and it shall be contractors responsibility to do so, if required.

5.6 The rates quoted shall be deemed to allow for all minor extras and constructional details, which are notspecifically shown on drawings or given in the specifications but are essential in the opinion of the Owner /

Consultant / Architect for the execution of works to con-form to good workmanship and sound engineering

practice.

5.7 The Owner / Consultant / Architect decision to clarify any item under minor changes, minor extras andconstructional details shall be final, conclusive and binding on the Contractor.

5.8 The rates quoted by the Contractor shall be net so as to include all the requirements described in thecontract agreement and no claim whatsoever due to fluctuations in the price of materials and labour will be

entertained.

5.9 In case the rates of identical items under different sub-heads / parts are different, the lowest of these will betaken for the purpose of making the payments.

5.10 The contractor shall provide all equipments, instruments, labour and such other assistance required by theOwner / Consultant / Architect for measurement of the works, materials etc.

6. VARIATION IN QUANTITIES & TENDER DRAWINGS:

The quantities for ancillary works given in the schedule and / or in drawings are for the guidance of thetenderer. The contractor shall be paid on the basis of actual quantities of works carried out. However the

contractor shall check these quantities before quoting and will bring to the notice of Owner / Consultant /

Architect for any major variation. HVAC drawings issued with the tender are diagrammatic only and


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indicate the general arrangement only. The data given in the drawings and specifications is as exact ascould be secured, but its accuracy is not guaranteed. Contractor shall carry out his own computations and

provide all such equipment, as required to achieve the specified conditions. The contract shall be on works

contract basis and the Client reserves the right to add on change & delete any items of work during the

currency of contract.

The price variation shall be permitted only if the actual quantities differ from the quantities given in the

document to an unlimited extent for the following items:-

a)

Ducting / duct lining / duct insulation etc.

b)

Condenser / Chilled / drain water piping, valves.

c) Powder coated Aluminium Extruded Grills / diffusers.

d) Power & control cabling.

e) Insulation of chilled / hot water / drain piping etc.

7. PERFORMANCE BOUND CONTRACT

The contract will be a performance bound contract and therefore the Bidder shall make their independent

check for Heat Load, selection of equipments etc. The drawings enclosed with the tender documents shall

be only tentative layout plans and for guidance purpose only. The detailed shop drawings shall be prepared

and submitted for approval to the Owner / Consultant / Architect.

The contractor shall guarantee the specified inside condition at specified outside condition considering the

fresh air as detailed in the basis of design of the tender documents.

The contractor shall guarantee that the capacity of various components as well as the whole system shall bewithin 3% of the specified capacity.

8. GUARANTEE

The contractor shall guarantee the complete AC system for a period of 12 months from the date of handing

over the plant after successful initial testing & one major seasonal test i.e. either summer or monsoon to the

department. The Tenderer shall guarantee the AC system to maintain space conditions as specified in

Section HVX-04A, Basis of Design / Scheme. They shall also guarantee that the performance of thevarious equipments individually or jointly shall be within 3% of the specified ratings when working

under operating conditions for the complete installation.

During guarantee period loss of refrigerant and oil, if any shall be borne by the air-conditioningcontractor. De-scaling, if required during the guarantee period, shall be done by air-conditioningcontractor free of cost if certified by OWNER.

9. REPAIRS / REPLACEMENT OF PARTS DURING GUARANTEE

Any defects or other faults which may appear within defect liability / guarantee period of twelve months

from the date of handing over the plant in a satisfactory working conditions to the Client (except for normal


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wear and tear) arising in the plant from material or workmanship not in accordance with the contractspecification will be rectified by the contractors free of cost & nothing shall be paid extra on any account.

10. TESTING

All testing instruments, velocity meter, digital thermometer, pyschrometer, measuring steel tapes, tools,scaffolding and ladders etc., that may be required for taking measurements shall be arranged by air-

conditioning contractor at his own cost.

All types of routine and other tests shall be carried out at the works of the Contractor or the manufacturers

of the components. The Client shall be free to witness any or all tests, if they so desired. The Contractor hasto inform to the Client before dispatch of any material / equipment.

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On the completion of the installation the Contractor shall arrange to carry out various initial tests asdetailed below, in the presence of Owner / Consultant / Architect and to the entire satisfaction of theOwner / Consultant / Architect. Any defect or short-coming found during the tests shall be speedilyrectified or made good by the Contractor at his own expenses.

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The initial tests shall include, but, not be limited to the following :

a) To operate and check proper functioning of all electrically operated components viz. Compressor

motor, pumps, fan of air handling units etc. as well as other electrical motors.

b) To test and check the proper functioning of electrical gears, safety and other controls to ensure their

proper functioning.

c) To check the air distribution system and to provide designed air flow in all areas by adjusting the grills,

diffusers and dampers for air-conditioning.

d) To check & balance / adjust the water in the water circuit for smooth and noiseless flow.

e) To check the systems against leaks in different circuits, alignment of motor, V belt adjustments,

control setting and all such other tests which are essential for smooth functioning of the plant.

f)

Contractor shall have to submit the capacity test of all equipment at site.

g) On the satisfactory completion of all Initial tests & one major seasonal test i.e. either summer or

monsoon the plant shall be considered Virtually Complete for the purpose of taking over by theClient.

h) In addition to the Initial test the Contractor shall also give summer, monsoon & winter tests of the

plant, each of (3) three days duration, and each one during the full specified outside conditions (whenthe ambient conditions are close to the specified ambient conditions). The first running test may be

taken on the completion of the initial test, provided the ambient temperature and humidity are near their

peak. Inside condition as per the contract, performance of each equipment, Airflow etc. shall be as per

the requirement of the contract during these tests.

It is clarified that guarantee period shall start after successful completion of one major test i.e.either summer or monsoon for all equipments & inside temperature in the working area if any.


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11. LIQUIDATED DAMAGES CLAUSE

For all delays attributed to the contractor in completion of job which do not merit extension of time the

contractor shall have to pay 1.0 % per week of delay subject to a maximum of 5% of the total contract

value & part thereof delay in completion of work. The liquidated damages shall be recoverable from the

payments due to air-conditioning contractor. It may be noted that the deduction of liquidated damages shallnot, however, absolve the contractor of his responsibility and obligation under the contract to complete the

work in totally as required under the contract.

12. OPERATION OF PLANT

The tenderer shall arrange to operate the plant for a period of ONE MONTH from the date ofcommissioning of plant and successful completion of initial test free of cost.

13. TRAINING OF PERSONAL

The contractor shall impart training to the minimum three technical staffs appointed by the Client free of

cost during erection and commissioning of the plant.

14. WEEKLY PROGRESS REPORT

A weekly progress report of site as per Section HVX-03Oshall be submitted in writing to the Owner /Consultant / Architect.

15. INSPECTION & TESTING

All major equipments such as water chilling units, cooling coils of air-handlers, air-handlers, electrical

panels etc. may be got inspected & tested before dispatch if desired by the client at the manufacturers work.

The AC Contractor shall intimate the Department in minimum 10 days advance advance about the date ofreadiness of equipment for inspection & testing at a date to be mutually agreed upon by the client & the AC

Contractor. The inspection of equipments / materials at site shall be done as per section HVX-03P.

The manufacturer of these equipments must have a facility of testing the equipments at the test bed on full

load at their works. All the test readings mutually taken shall be recorded & evaluated with the technical

data furnished by the AC Contractor.

16. STORAGE OF MATERIALS / EQUIPMENTS

Plant room / Air handling unit room, if ready can be used for storage of materials / equipment brought to

site by the contractors. Watch and ward of the same shall be the contractors responsibility. In case the

plant room space is not readily available, it shall be contractors responsibility to make his own temporarystructure at site with approved location from the client at his own cost.

17. POWER & WATER SUPPLY

Contractor shall make their own arrangement for Electricity for erection. Only Water for erection purposeshall be provided by the client at one point free of cost. In case of non availability of the same the AC

contractor shall make his own arrangement for water & power required for erection purposes at their own


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cost without any delay in progress of work. However water & power required for testing & commissioningshall be provided by the client.

18. INSURANCE

The contractor shall be responsible for the storage and safe custody of all equipment / materials brought tosite from time to time till the plant is taken over by the department. The contractor may provide adequate

and comprehensive insurance coverage for storage and execution.

The contractor shall be responsible for all the injury or damage to persons, buildings, structures, property

etc., which may arise form any act of omission on part of the contractor or his servants or sub contractors orhis employee etc. The contractor shall indemnify and keep indemnified the owner and hold him harmless in

all respects of and any expenditure liability, loss, claims or proceeding arising from any such injury or

damage to persons or property as aforesaid.

The contractor may undertake all risk policy including earthquake risk with an insurance company

approved by the owner in the joint names of owner and contractor at his own expense.

19. COMPREHENSIVE ANNUAL MAINTENANCE

The Contractor shall quote for Comprehensive Annual Maintenance service contract for the system offered

by him for a period of 2 years after completion of Guarantee period. Any parts/Components consumable

whatsoever needs replacement during the above mentioned period shall be supplied and installed by the

vendor without extra cost.

Periodical checking for all parameters for machines operation and diagnosis, routine checking and cleaning

operations, annual preventive maintenance / overhauling as required for smooth and trouble free operation

of the package shall be carried out by the contractor. The contractor shall furnish detailed facilities

available with him for executing such contract and also furnish annual charges for the same in the priced

part of the Bid. Rates shall be quoted in the Price Bid only.

Note- Price bid shall be evaluated considering the price loading on account of power consumption,guarantee & two years AMC charges.

20. All technical data to be filled by the bidders in section HVX-05E shall be accepted in metric system only.Any bidder submitting the technical data in any other unit would render his bid liable for rejection. The

technical data should be typed in capitals only.

END OF SECTION HVX- 01A


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SECTION HVX 01B

APPENDIX TO THE CONDITIONS OF THE CONTRACT

1. Time for completion. : Four Months from the date of Award of Contract.

2. Validity of the Tender : 30 days from the date of submission

3. Liquidated Damage Clause : 1.0 % per week of delay subject to a maximum of 5%

of the total contract value As per point 11 Liquidated

damages, of Section HVX-01A.

4. Payment Term a) 2.5% of Contract amount excluding chiller as

mobilization against the submission of Bank Guarantee of

equivalent amount valid till end of completion period.

b)2.5% on Actual Mobilization at site, approval of

drawings commencement of work at site andsubmission of Bank Guarantee of equivalent amount

valid till end of completion period.

c) 55% of Contract amount on pro-rata basis against

supply of material at site.

d)

20% of Contract amount on pro-rata basis against

erection & testing.

e)

20% on testing and commissioning of entire system.

f)

10% amount shall be deducted from each RA Bill asretention money and 50% of this amount shall be paid

after completion of work, handing over of all as built

drawings, designs, maintenance manuals etc. against

submission of Bank Guarantee of the same amount.

Balance 50% of this amount shall be released after

completion of Defect Liability Period.

END OF SECTION HVX 01B


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SECTION HVX-02A

STANDARD SPECIFICATION OF IMPORTED ROTARY SCREW CHILLERS

2A.00 The specifications under this section covers the supply, installation, testing and commissioning of the

ROTARY SCREW CHILLERS conforming to following parameters and in accordance with therequirements of the schedule of equipment.

TEST CERTIFICATES AT MANUFACTURERS TEST BED.

It is necessary for the AC contractor to furnish detailed certificates of tests carried out on test bed inthe factory before dispatch of water chilling units. The AC contractor not conforming & complyingwith this condition shall render his offer liable for rejection.

2A.10 ROTARY SCREW CHILLERS

The Imported Rotary Screw Water chilling machine shall consist of Single / Twin, Horizontal / Vertical,

Hermetic / Semi -hermetic / Direct driven low speed helical rotary compressors, closed transition starter(Factory Fitted) delta starter refrigerant / motor, oil separator, evaporator, condenser, factory mounted

microprocessor based panel, interconnecting refrigerant piping, electronic expansion valve, controls and

accessories to make it compact & efficient unit. The capacity control shall be achieved by use of slide valve

to provide fully modulating control from 100 % to 25 % of the full load.

The cost of closed transition starter is to be included in the cost of unit.

2A.11 COMPRESSOR

A. HERMETICALLY SEALED COMPRESSOR

The Vertical type helical rotary compressor shall be direct drive at low speed for higher reliability &efficiency. The compressors should have minimum rotating parts. The rotors shall be mounted on

antifriction bearings designed to reduce friction and power input & suitable to handle radial & axial

loads.

Compressor Motor

The driving motor shall be suitable hermetic type protected against damages by means of built in protection

devices & suitable for 415 Volts 10%, 50Hz 5%, AC supply.

B. SEMIHERMETIC COMPRESSOR

The horizontal helical rotary compressor shall be direct drive at low speed for higher reliability &efficiency. The compressor should have minimum rotating parts.

Compressor Motor

The compressor should be driven by refrigerant cooled, hermetically sealed, two pole squirrel cageinduction motor & should be suitable for 415 Volts 10%, 50Hz 5%, AC supply.

2A.20 CONDENSOR EVAPORATOR


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The shells shall be fabricated from carbon steel plate. Evaporator and condenser are to be designed, tested

and stamped in accordance with ASME code for refrigerant side working pressure of 300 Psig.

All tube sheets should be made of carbon steel. Evaporator and condenser tubes are to be individually

replaceable. Standard tubes are externally finned, internally enhanced seamless copper with lands at alltube sheets. Tubes are to be mechanically expanded into tube sheets. Condenser tubes are to be

mechanically fastened to tube supports. In condenser baffle plates are to be provided to prevent direct

impingement of compressor discharge gas upon tubes.

All water pass arrangements will be either flat-faced flanged ( 150 or 300 psig waterside ) or marineconfiguration with grooved connections (300 psig waterside). All connections may be either right or left

handed. Water side will be hydrostatically tested at one & half times design working pressure or at 225

psig whichever is more & also water passes arrangement should 2 passes only.

The insulation of evaporators shall be as per manufacturers standards & shall be factory insulated only.

2A.30 REFRIGERANT

The Rotary Screw Chiller shall be selected on R-134Arefrigerant only. The water chilling unit should befully factory charged with refrigerant & oil & spare refrigerant & oil must be sent along with the machine

for topping up of gas & oil as may be required.

02A.31 REFRIGERANT CIRCUIT

A multiple orifice control system consisting of an electronically controlled expansion valve and a fixed

orifice would maintain and control refrigerant flow into evaporator.

02A.40 MICROPROCESSOR BASED CONTROL PANEL

Factory mounted microprocessor-based control panel must be provided with at least the followingfeatures:

1.

Automatic shutdown protection with manual reset for

a) Low evaporator refrigerant temperature and pressure,

b) High condenser refrigerant pressure,

c)

Loss of condenser water flow and chilled water flow by DP switch.

d)

High motor temperature,

e)

Low oil flow,

f)

Electrical distribution faults such as Phase reversal, phase loss, Phase imbalance, motor current

overload,g)

High compressor discharge temperature.

2. Critical sensor or detection of circuit fault in

a) Starter transition failure.b) External or local emergency stop.


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3. Automatic shutdown protection with automatic reset when condition is corrected for loss of chilled waterand condenser water flow, high compressor discharge temperature, under / over voltage and momentary

power loss.

Display Panel should display chilled water Temp In & Out, Condenser Water Temp In & Out &

also Current display and Volts & fault annunciation.

The monitoring system should be provided for early detection and warning of refrigerant loss.

Microprocessor based chilled water reset based on return water is necessary & must be provided.

The unit control panel should be capable of avoiding unit shutdown due to transient abnormal operating

conditions associated with low evaporator refrigerant temperature, high condensing temperature andmotor current overload. If the abnormal operating condition persists and the protective limit is reached,

the machine will be shut down. The microprocessor based panel should be compatible to building

management system. Interface card & other hardware / software required shall be supplied withthe panel of Chilling Machine.

2A.50 SELECTION OF WATER CHILLING UNIT

The Water chilling unit should be selected for the duty as specified in Schedule of EquipmentSECTION HVX-04C.The water chilling unit should be selected for power consumption of notmore than 0.68 IKW / TR at 100 % load at operating conditions..

The Rotary Screw Water Chilling Machine at works Part load such as 25%, 50%, 75% & 100%.

2A.60 INSTALLATION

The Rotary Screw chiller shall be installed over a reinforced cement concrete platform on flooring and shall

be adequately isolated as per manufacturers recommendations against transmission of vibration to the

building structure.

2A.70 PAINTING

The Rotary Screw Chilling machine shall be finished with durable enamel paint. The shop coats of paint

that may become marred during shipment or erection, shall be cleared with mineral spirit, wire bushed and

spot primed over the affected areas & then be coated with enamel paint.

END OF SECTION HVX-02A


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SECTION-HVX- 02B

STANDARD SPECIFICATIONS OF PUMP SETS

2B.00 PUMP SETS

This section deals with supply, erection, testing and commissioning of water pump sets conforming to

general specification and suitable for the duty selected as indicated in Schedule of Equipment, SectionHVX-04C. The type, capacity and size of pumps shall suit the parameters given under Section HVX-04C.The Pumps selected should have high efficiency which should be supported by selection charts and curves.

2B.10 MONOBLOCK PUMPSETS

The construction of mono block pumps shall be as follows and as per ISI 1520.

Duty Chilled water

Casing Cast Iron

Impeller Bronze

Shaft Steel

Bearings Ball

Base Plate Cast Iron /MS

Speed 2900 RPM

Motor TEFC

Starter DOL

The impellers of pumps shall be statically and dynamically balanced supported by test certificate of

manufacturers.

The following accessories shall be provided with each pump and not limited to the list.

a)

Air vent Cocks.

b)

Lubrication fittings and seals.

c)

25mm G.I. Drain piping up to the nearest drain point.

d)

Suction and Discharge shut of valves.

e) Discharge check valves

f)

Suction and delivery pressure gauges of 150 diameter.


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SECTION-HVX-02C

STANDARD SPECIFICATIONS OF COOLING TOWERS

2C.00 COOLING TOWER

This section deals with supply, erection, testing and commissioning of cooling towers, conforming to

general specifications and suitable for the load parameters indicated in Schedule of Equipment.

The function of efficient cooling tower is to cool adequate quantity of water through a range of 4.2 Cefficiently with reference to ambient Wet Bulb Temperature approach of 3.9C.

TYPES: The cooling tower selected shall be induced draft, counter / cross flow type conforming to theirrespective specification as under. The cooling tower should be installed in open space where free flow of

air is available. The cooling towers shall be constructed conforming to relevant ASME standards

2C.10 FRP INDUCED DRAFT COUNTER FLOW COOLING TOWER

The Fibre Glass reinforced plastic Cooling Tower shall be suitable for outdoor installation. TheCooling Tower shall be vertical, induced draft, counter flow in fibre-glass reinforcement plasticconstruction, complete with fan, motor, surface and spray section, eliminators, steel supports etc.

a)

CAPACITY :

The cooling tower capacities shall be as per Section HVX-04C, Schedule of Equipments.

b)

SIDE CASING :

Side casing shall be made out of FRP with smooth surface for minimum resistance to air flow. It shall have

sufficient structural strength to withstand high wind velocities and vibration. The casing shall be installedin the fibreglass reinforced basin. The tower supporting structure shall be made out of hot dipped

galvanized frame. The tower shall have FRP panels reinforced with embedded steel frame.

c)

COLD WATER BASIN :

The Cold Water Basin shall be a deep fibreglass reinforced sump on which cooling tower structure shall be

supported.

Basin fittings shall include the following :

i)

Bottom Outlet.

ii)

Screened suction assembly fixed to the basin.

iii)

Drain at under side of suction, suction side sheet.

iv) Overflow fixed to inside of casing side sheet.

v)

Ball type automatic make-up water valve.


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vi) Equalizing connection where required.

vii) Quick Fill arrangements

d) DISTRIBUTION SYSTEM

Hot water distribution system shall comprise of header and branch arms system.

e) FILLINGS :

The Fillings shall be made of corrosion proof and rigid film in cross fluted design and arranged in square /

rectangular form and shall be elevated from the floor of the cold water basin to facilitate cleaning and easy

replacement. They shall be arranged in such a manner to ensure negligible resistance to air flow and to

eliminate back water spots and prevent fouling trough scales that may form. In order to reduce carry-over

losses through entrapment of water droplets in air stream, PVC drift eliminators shall be installed.

Thickness of PVC fill shall not be less than 0.02 mm.

f)

MECHANICAL EQUIPMENT :

The Fan shall be propeller type, light-weight rotor fitted with multiple Aerofoil blades. The entire fan

assembly shall be statically balanced. The fan shall be direct / gear driven by TEFC motor suitable for 415

volts 10%, 3 phase, 50 Hz 5%, AC supply conforming to IP 55. The fan shall be protected by fan guard

and shall be easily accessible for inspection and maintenance. The mechanical equipment assembly shall be

adequately supported on a rugged steel base welded to tubular support assuring vibration-free support. Fan

guard shall be provided to prevent birds from nesting during idling periods. All fans shall be direct driven

with low RPM suitable for low noise application.

3C.20 INDUCED DRAFT CROSS FLOW:

The induced draft cross flow FRP cooling tower should be complete with corrosion proof construction and

all steel components including assembly hardware are hot dip galvanised construction with FRP cold & hot

basin .The induced draft propeller fan of the cooling tower shall be direct / gear driven by TEFC squirrel

cage motor located outside the moist air stream. The corrosion proof PVC fill should be vacuum formed to

provide maximum heat transfer surface. The design should also include cellular drift eliminators and

honeycomb air inlet louvers right on the fill sheet. The maintenance on the mechanical equipment should

be provided from outside the tower & access to the tower interior should be available through the opening

in the centre of cold basin.

WATER DISTRIBUTION SYSTEM

The warm water flows through external piping into a chamber at the top of the tower. The splash boxprevents the incoming water from spilling out of the basin and helps in providing uniform water

distribution & the water should flow by gravity from the fibreglass basin through nozzles to the fill.

FILL /LOUVERS/DRIFT ELIMINATORS

The fill sheet includes both louvers and drift eliminators & the louvers should prevent water from escaping

the fill sheets to assure proper & efficient heat transfer throughout wide variations in the airflow. The HDG

steel structural tubes shall support & stabilize the fill in position & shall also hold the fill sheets in position


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above the cold water basin to facilitate the cleaning of the basin. Suitable screens between the side of thecold water basin & the base of the fill should be provided to prevent foreign materials in the circulating

water flow & should be easily removable.

COLD WATER BASIN:

The specification for cold water basin shall be same as given for counter flow cooling tower.

2C.30 PAINTING:

The cooling tower shall be procured of the colour, strictly in accordance with written approval of the

Engineer in Charge and should have a striking finish.

2C.40 PERFORMANCE DATA:

The complete performance ratings and power consumption at varying outdoor wet bulb temperatures, shall

be submitted and verified at the time of testing and commissioning of the installation. The Capacity of thecooling tower shall be computed as indicated in the testing procedures for air - conditioning equipments.

2C.50 ACCESSORIES:

Each cold water basin shall be provided with a deep leak proof sump complete with a suitable suction

strainer having duplicate screen. The strainer shall have handles for its removal.

The cooling tower basin shall be provided with automatic float valve with a stop valve for continuous make

up water flow, quick fill arrangement with stop valve, over-flow and drain connections with stop valves.

A hot water bleed connection to the drain line through a stop valve shall be provided. It shall be connected

to the drain line below the drain stop valve.

Steel ladders shall be provided in such a manner and location as necessary to give safe and completeaccess to all parts of tower requiring inspection. Each ladder shall be made of iron sides and 16 mm straps

and shall be bolted to the tower on the top and grouted in masonry at the bottom end.

All pipe connections shall be hot dip galvanized and double flanged.

2C.60 TESTING:

The testing of cooling towers shall be conducted as per ASME codes and results should be within 5% of

the specified capacity.

END OF SECTION-HVX-02C


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SECTION-HVX-02D

STANDARD SPECIFICATIONS OF HOT WATER GENERATOR

2D.00 This section deals with supply, installation, testing and commissioning of electric fired Hot Water

Generator System to be supplied as mentioned in Detailed Bill of Quantities.

2D.10 HOT WATER GENERATOR.

Construction: The hot water generator shall be Vertical/Horizontal shell type. The shell shall be constructed

out of 6 mm.thick MS Sheet with electric fusion welded seams & in accordance with ASME Boiler &Pressure Vessel Code, Section IV.

The shell shall be duly insulated & shall be mounted in a cabinet of suitable angle iron frame from 16SWG mild sheet steel covers complete with hinges, locks etc. to make a sturdy compact assembly.The cabinet shall be provided with sufficient ventilation of heaters terminals of the boiler. The angleiron frames shall be provided with lifting lugs & pedestals.

The heaters shall be provided in such a way as to provide balanced distribution of the load. The electrical

heater which shall be mounted within seamless copper sheethed electrically resistant U-Tubes, flanges

mounted with stainless steel studs. The heaters will be easily removable without opening of terminal

plates. The heaters shall be suitable for 240 + 10%, 50 + 5% HZ. Single Phase AC Supply and will be in

direct contact with water contained in the shell.

CONTROLS & ACCESSORIES.

The hot water generator will be provided and not limited to following controls & accessories.

a)

100 mm.dia dial type thermometer mercury in bulb at inlet & outlet (Range 0-100 C)

b) 100 mm.dia pressure guage with ball valve at inlet & outlet (Range 0 to 20 Kg/cm2 )

c)

Flow switch, float switch, automatic alarm for low water level and high temperature with independent

indication lights.

d) Pressure relief valves.

e)

Inlet & outlet pipes with flanges.

f)

Drain points with valves.

g)

Descaling Valves.

h)

Automatic airvent.

i)

Thermostat for individual heater banks or step controller.

j)

Safety Thermostat .

PRESSURE TESTING.


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The hot water generator shall be tested in the factory at 160 PSI.

INSULATION.

The hot water generator shall be insulated with minimum 50mm thick fibre glass of density 24 Kg/m2 &cladded with 0.63 mm aluminium sheet on MS Frame welded on generator body.

ELECTRICAL CONTROL PANEL.

The electrical control panel shall be mounted directly on the main frame confirming to standardspecification of Indian Electricity Rules. All controls shall be factory wired & tested. The control panel

shall have the following accessories of makes mentioned in Section ACE-19.

a) Incoming MCCB/SFU with copper bus bar.

b) On-off Toggle switch for operating individual banks.

c) Contactor for individual banks with HRC fuses.

d) Indicating on/off lights status for individual banks.e) Fault indicating lights.

f) Alarm with manual reset.

g) Copper connections with cable & control cabling.

h) Three phase ammeters & voltmeter with selector switch.

The electrical panel doors should be openable only after total incoming power supply is cut off.

PAINTING

The external surface of the shell shall be derusted, cleaned & applied with three coats of primer & finally

have powder coating of approved shade.

2D.20 HUMIDIFICATION ARRANGEMENTS.

The humidification arrangement shall be provided by AC contractors (wherever specified in the Schedule

of quantities in section . This shall consist of the following arrangement.

2D.30 PAN TYPE HUMIDIFIER.

A pan type humidifier of required capacity as specified in bill of quantities shall be provided. The pan type

humidified shall be constructed from 2 mm thick stainless sheet SS-304 with top cover openable for

maintenance. The humidifier shall be complete with quick fill, make up overflow & drain connections. The

humidifier shall be insulated with fibre glass of density 32 kg/cm2 & shall be cladded with 22G thick

aluminium sheet. The humidifier is divided in two chambers from inside, one bank of heater is always kepton to maintain water temperature between 60 to 70 C with thermostat. All controls such as low level cut

out, thermostat, float valve shall be provided. It shall be factory wired & tested. The humidifier shall have

its own powder coated electrical panel made of 16 G CRCA sheet complete with contactors, MCB Low

level cutout, Heating thermostat, fault indicating lamp, high temperature cutout etc. & internally wired.

END OF SECTION-HVX 02D


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SEECTION HVX-03A

STANDARD SPECIFICATION OF DOUBLE SKINNED AIR HANDLERS

3A.00 SCOPE

This section deals with supply, installation, testing and commissioning of horizontal & ceiling suspended

type air handlers of various capacities and sizes as enumerated under the head Detailed Bill of Quantitiesand Schedule of equipment and conforming to the following specifications.

3A.10 TYPE

The horizontal & ceiling suspended type air handlers shall be of double / single skin construction as

specified in the Bill of Quantities, draw through type comprising of various sections such as pre filter

section, cooling coil section, fan section etc.

3A.11 CAPACITY

The air handling unit capacities, maximum motor H.P, static pressure, cooling coil area, pre-filters etc. shall

be according to Schedule of Equipment & Detailed Bill of Quantities.

3A.12 DOUBLE SKINNED CASING

The casing shall be self supporting type, factory fabricated & assembled made of extruded anodised

aluminum hollow sections to make a rigid frame structure. The frame shall be assembled using pressure die

cast aluminum joints. The self supporting unit shall consist of sandwiched panel made out of 0.6mm thick

pre-plasticide / pre-coated GI sheet outside & 0.6mm GI sheet inside duly factory fabricated & insulated

with 23 mm thick injected PU foam insulation of 36 Kg/m density in between as specified in Detailed Billof Quantities. The insulated panels shall be bolted to main frame with neoprene rubber gaskets held

captive in the framed extrusion to make it leak proof. Suitable air tight access doors / panels with pressuredie cast aluminum hinges & nylon handles and locks shall be provided for access to various sections for

maintenance. The Entire housing shall be mounted on Extruded Aluminum channel frame work having

pressure die cast aluminum jointers or the frame work shall be joined together with corner plates

Condensate. Drain Pan shall be constructed of 18 gauge polished stainless steel sheet with all corners

welded with uniform slope from all sides leading to drain pan ensuring no stagnation of condensate water.

Drain Pan shall be sandwich type insulated with 10 mm thick nitrile foam.

3A.13 MOTOR & DRIVE FOR AIR HANDLING UNITS

The fan motors shall be 415 10% volts, 50 5 % HZ, 3 phase TEFC SQ. Cage induction motor. The

motor shall be specially designed for quiet operation & motor speed shall not exceed 1440 RPM. Drive to

fan shall be provided through belt drive arrangement. Belts shall be of the resistant type only.

3A.14 FAN OF AIRHANDLING UNITS

The casing shall have heavy gauge GI construction forward curved DIDW imported fan statically &dynamically balanced mounted on EN8 solid shaft or C 40 carbon steel. The supply air DIDW fan shall be

forward curved. The fan impeller shall be supported to housing with angle iron frame & pillow block heavy

duty ball bearing. The fan shall be selected for a fan outlet velocity below 11 meter / sec. The fan housing


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with TEFC Sq. Cage motor shall be mounted on a common adjustable base frame on vibration isolators incase the impeller diameter is exceeding 450 mm & rubber turret mounts vibration isolators for fan diameter

up to 450mm diameter. The fan motor shall be installed inside the housing of air handling unit to keep low

noise level. The fan & motor assembly shall be of aluminum extruded section only.The Fan speed shouldbe selected not more 1000 RPM. The Noise Level not more than 80 db Level.

3A.15 COOLING COILS

The cooling shall be made of aluminum fins and copper tubes of dia.12.5mm or 16mm OD. The minimum

no. of fins / cm for cooling coils shall be 4.72. The bonding of aluminum fins with copper should be done

hydraulically. The tube thickness shall be 0.51 mm & fin thickness shall be 0.15 mm the cooling coilshould be tested for leaks at a hydraulic pressure of at least 10 Kg / sq.cm. for a minimum period of 3 hours

at works. The velocity across face should be limited to 152 metre / minute. In case of chilled water coils the

design should be such to limit water velocity to maximum of 2.5 m / sec.

3A.16 FILTERS

Each unit shall be provided with a factory assembled filter section containing washable synthetic tube airfilters having extruded aluminum frame having filtration capacity of 10 micron particle size with an

efficiency of 90% efficiency. Filters shall fit so as to prevent by pass. Holding frames shall be provided for

installing a number of filters cells in banks. These cells shall be held within the frames by sliding the cells

between guiding channels. Face velocity across filters shall not exceed 152 MPM

3A.17 ACCESSORIES

The following accessories must be provided with each air handlers

a)

Belt guard at the access window. (Part of AHU & not to be priced separately)

b)

Limit Switch with AHU access window. (Part of AHU & not to be priced separately)

c) Air vents with globe valve at highest point in the chilled water pipe in all AHU rooms.

d)

Borden type pressure gauge conforming to IS 3624 with gun metal globe valves shall be provided at the

inlet and outlet of coils.

e) V form Thermometers with metal guards shall be provided at inlet and outlet of water of cooling coil.

f)

Balancing valves at coil outlet and butterfly valve at coil inlet.

The quantities of item (c) to (f) have been separately quantified under Bill of Quantities and should not be

estimated along with the AHU.

END OF SECTION HVX-03A


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SECTION HVX-03B

STANDARD SPECIFICATION OF FAN COIL UNITS

3B.00 This section deals with supply, erection and commissioning of fan coil units conforming to general

specifications and suitable for duty selected as indicated in Schedule of Equipment.

3B.10 FAN COIL UNITS

The horizontal type of fan coil units shall be complete with centrifugal blowers of aluminum construction,

3 speed permanent split-capacitor type fan motor, cooling coil, sandwiched type insulated drain pan etc.

The outer casing of Fan Coil Unit shall be of 18G cold roll M.S sheet of suitable size to accommodate all

piping and controls. The sandwiched drain pan for accommodating all controls shall be of 16G GI sheet

duly insulated with 25mm thick expanded polystyrene.

The cooling coil shall be 4 row deep having minimum 4.7 fins / cm. The fins configuration of Sigma flow

or plain fin shall be acceptable. The OD of copper tube shall be 9.5 mm minimum & wall thickness of 0.5mm.

The fan shall be centrifugal, forward curved driven by 3 speed permanent split capacitor type fan motor.

The Fan Coil Units shall be provided with the following accessories given below.

a)

Double fire retardant Canvass Connection.

b) 12 mm thick cleanable aluminium filters with aluminium frame.

c)

Strainer with ball valve at inlet & ball valve at outlet.

d)

Balancing valve in return chilled water line.

e) Copper connections between chilled water lines, controls etc.

f)

Electrical wiring between motors & speed regulator.

It may be noted that all accessories specified above shall be provided along with the Fan Coil Unit and shall

be included in the price of Fan Coil Unit.

Each Fan Coil Unit shall be tested at factory & complete in all respects. The sound level of the unit should

not exceed 40 dB. The test certificate shall be furnished with each Coil Unit. It is necessary to design the

fan coil unit in a way to have silent operation.

The Fan Coil Unit shall be powder coated both internally & externally.

3B.20 PARAMETERS OF FAN COIL UNITS

The Parameters of Fan Coil Units are given below:


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FAN COIL UNIT-CEILING SUSPENDED

Capacity 1.5TR 2.0TR 2.5TR

a) Air quantity CMH 1020 1360 1700

b) Fan Static pressure ------------------ 12MM -----------------

c) Face area of cooling Coil --to suit the requirement at 500 FPM--

d) Minimum no. of fins / cm -------------------4.7----------------------

e) No. of rows deep 4 4 4

f) Motor HP ----(Fractional HP, Single phase)---

g) Sandwiched tray -----------------YES---------------------

h) Type of painting -----Powder coated finish only-------

END OF SECTION HVX-03B


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SECTION HVX-03C

STANDARD SPECIFICATIONS OF CONTROL SYSTEM

3C.0 This section deals with supply, installation and testing, commissioning of necessary controls (automatic)

and instruments conforming to these specifications and shall be in accordance with Bill of Quantities. Thevarious controls listed below shall be electrically operated and in case of low voltage controls the necessary

step down transformer shall be provided with each control. All automatic controls shall be as detailed in

specifications below, however, if the automatic control is not already installed on the machines, it may be

installed by the contractor as per Bill of Quantities.

3C.1 CONTROLS FOR AIR HANDLER

Three way modulating valves:

The three way modulating valves shall be provided in chilled & hot water line to the cooling & heating coil

of Air-handlers which is actuated by a proportionating thermostat. The three-way valve shall be selected for

valve authority value in the range of 30 % to 60 %. These valves shall consist of bronze metal valve bodywith stainless steel trim with linear flow characteristics. Modulating motor shall be suitable for operation

with a signal of 0-10 volt DC from the IBMS System. The pressure drop across valve for air-handler unit

shall not exceed 5.0 PSI. The valve linkages shall be of the same make as of valves & modulating motor.

3C.2 THERMOSTATS

a)

Snap Acting Humidistat for AHU:-

These shall be electrically operated fixed differential type with the sensing elements located in the return

air passage. The exact mounting arrangement, profile etc. shall be derived as per location requirements.

b)

Proportionating Thermostat for AHU:-

For Air-handlers, three way mixing valves shall be proportionately operated based on return air temperature

& is suitable to operate in the range of 14 to 30 C.

3C.3 INSTRUMENTS

i) Thermometer: The alcohol filled V-form thermometer shall have range of 50 C. for air-conditioning application. These shall be provided at inlet / outlet of chillers & air-handers.

ii) Pressure gauges: The pressure gauges shall be dial type of 150 mm dia to be installed at inlet /outlet of chillers, condensers, suction and discharge ends of pump-sets. The air-handlers shall have

common pressure gauge for inlet & outlet. The pressure gauges shall be connected to the pipes by commondia copper pipe with shut off cocks required for gauges protection during testing.

END OF SECTION HVX-03C


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SECTION HVX-03D

NOISE AND VIBRATION CONTROLS

2D.00 The air conditioning contractor must take all necessary precautions to have minimum noise generation and

its transmission. Minimum vibration as permitted by IS relevant code shall be ensured. A few points forguidance only are given below:

2D.01 a) Double fire retardant flexible connections shall be provided from air discharge to outlet of air-handler to the duct.

b)

Vibration isolation pads of suitable thickness commensurate to loading for isolation of vibration

shall be provided under all pumps, air handlers fans etc. in consultation with manufacturer for

proper selection of vibration isolators

c) Vibration isolation springs of suitable size to suit the weight of water chilling machine if

recommended by the manufacturer for elimination of vibrations shall be provided as suitable for

type & model of water chilling unit.

d)

Flexible conduit connections of minimum diameter of 50mm to motors shall be provided. All loops

should be large enough to allow connections to remain flexible.

e)

All conduit connection where conduits are 60mm or larger shall be made of 1.2 meters minimum

length conduit installed in the shape of U and grossly slack to provide maximum vibration

isolation.

f) Operating clearance of 40mm shall be kept between the base and the inertia base.

g)

All end suction pumps shall be bolted and grouted to the inertia base which in turn shall be

supported on suitable vibration isolation rubber pads duly sandwitched with 24G GI sheets.Concrete inertia blocks shall be formed of suitable thickness and of adequate mass.

h)

The floor supported piping shall be mounted on pipe supports with 7.5mm ribbed neoprene pads

between the base plate of the pipes and the floors.

i) All items suspended from false ceiling shall be isolated on separate hangers.

j)

In case of ducts, conduits, pipes & tubes the annular space between construction and penetrating

element shall be sealed with sand cement plaster.

k)

The air-conditioning contractor shall take all other precautions or shall make his own arrangements

even if not specified in the tender documents for eliminating high noise levels & shall minimisevibrations in all mechanical equipments without any additional cost.

END OF SECTION HVX-03D


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SECTION HVX-03E

STANDARD SPECIFICATION FOR AIR CIRCULATION SYSTEM

3E.00 This section deals with supply, erection, testing & balancing of GI sheet metal duct work and air registers

conforming to specifications as given below:

3E.10 MATERIAL FOR DUCTING

All the ducts shall of LFQ (Lock Forming Quality) grade prime G.I. raw material furnished with

accompanying Mill Test Certificates. Galvanizing shall be 120gms/sq.m. ( total coating on both sides).

MAXIMUM THICKNESS TYPE OF TRANSVERSE BRACINGSIDE OF GI SHEET JOINT CONNECTIONS

(1) (2) (3) (4)

mm mm

Up to 300 0.63 S-drive, pocket or bar NoneSlips, on 2.5m centers

301 to 600 0.63 S-drive, pocket or bar None

601 to 750 slips, on 2.5m centres 25 x 25 x 3 mmS-drive, 25mm pocket angles, 1.2m

or 25 mm bar slips on from joint

2.5m centers.

751 to 1000 0.80 Drive, 25-mm pocket or 25 x 25 x 3 mm25mm bar slips, on 2.5 m angles, 1.2 m

centres 40 x 40 mm angle from joint

connections,1001 to 1500 or 40-mm bar slips, with 40 x 40 x 3 mm

35 x 3 mm bar reinforcing angles, 1.2 m from

on 2.5 m centres. joints

1501 to 2250 1.00 40 x 40 mm angle conn- 40 x 40 x 3 mm

ections, or 40-mm bar diagnol angles, or

slips, 1 m maximum 40 x 40 x 3 mm

centres with 35 x 3 mm angle 60 cm from

bar reinforcing . joint.

2250 to above* 1.25 50 x 50 mm angle connec- 40 x 40 x 4 mm

tions, or 40 mm pocket or diagnol angles, or40 mm bar slips, 1 m max. 40 x 40 x 3 mm

centres with 35 x 3 mm bar angles, 60 cm

reinforcing. From joint.

* Ducts 2250 mm and larger require special field study for hanging and supporting

methods.

In addition to above the following points should be also taken into account while fabrication of ducts.


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a)

All ducts of size larger than 450mm shall be cross broken.

b) All ducts shall be supported from the ceiling / slab by means of MS rods of dia 9mm with MS

angle of size 40 x 40 x 5 mm at the bottom with neoprene pad in between the duct & MS angle.

The ducts shall be suspended from the ceiling with the help of dash fasteners. Provision fornecessary ancillary materials required for hanging the ducts shall be arranged by the contractor.

c) The vanes shall be provided wherever required and shall be securely fastened to prevent noise &

vibration.

d) The rubber gasket shall be installed between duct flanges in all connections and joints.

e)

All flanges and supports should be primer coated.

f) The flexible joints shall be fitted to the delivery side of AHU fans with Fire Retardant Double

canvass. The length of flexible joints should not be less than 150 mm and not more than 300 mm

between faces.

g)

The ducting work can be modified if deemed necessary in consultation with the Engineer in Charge

to suit actual site conditions in the building.

h) Box Type Dampers & Splitters

These dampers shall be provided in the ducting work for proper control and balancing of air

distribution. All dampers shall be louver type robust construction. These dampers shall be fitted

with easily accessable operating mechanism, complete with links, levers, quadrant for proper

control and setting in a desired position. The position of the handle of the damper operating

mechanism shall be clearly visible and shall indicate the position of the damper in the duct. All

dampers, splitters shall be fabricated out of G.S. sheet of two gauges higher than the duct piecehaving these fittings. Dampers shall be installed in duct at all required locations. No extrapayment shall be made separately since these form part of Air Circulation System.

NOTE: In case angle iron supports are not feasible to be installed for supporting the ducts due toheight constraint then the contractor shall support the ducts with M.S flats of at least double the

thickness of the angle iron supports.

3E.20 A) THE SUPPLY AND RETURN AIR GRILLS AND CEILING DIFFUSERS

The supply and return air grills and ceiling diffusers shall be made of powder coated extruded aluminum

sections. The supply air grills / diffusers shall be provided with screw operated opposed blade volume

control device made of extruded aluminum in black anodised finish.

All grills / diffusers shall have soft continuous rubber / foam gasket between the periphery of the grills /

diffusers and surface on which it has to be mounted. The colour of grills / diffuser shall be as per the

approval of the Engineer in Charge.

B) LINEAR SUPPLY AND RETURN GRILLS


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The linear continuous supply / return air grills shall be made of powder coated extruded aluminumconstruction with fixed horizontal bars. The thickness of fixed bar louvers shall be 5mm in front and the

flange shall be 20mm wide with round edges. The register shall be suitable for concealed fixing and

horizontal bars of the grills shall mechanically crimped from the back to hold them.

The colour of grills shall be as per the approval of the Engineer in Charge. The volume control device madeof extruded aluminum construction in black anodised finish shall be provided in supply air duct collars

only.

C) FRONT FIXED BAR REAR ADJUSTABLE LOUVERED GRILLS.

The grills shall be made of powder coated extruded aluminum construction with front fixed horizontal barat 0 degree inclination with one way or two way deflection with rear vertical individually adjustable

louvers in black shade mounted on Nylon bushes to hold deflection setting under all conditions of velocity

and pressure.

The colour of grills shall be as per the approval of the Engineer in Charge. The volume control device of

extruded aluminum construction in black anodised finish shall be provided in supply air duct collars.

D) SQUARE / RECTANGULAR CEILING DIFFUSERS.

The square / rectangular ceiling diffusers shall be made of powder coated extruded aluminum construction

with flush fixed pattern. The diffusers shall have Anti-Smudge ring and spring loaded removable central

core in various pattern for air flow direction. The diffusers shall be mounted by concealed screw fixing

arrangement. The volume control device of extruded aluminum construction in black anodised finish shall

be provided in supply air diffusers. The colour of diffuser shall be as per the approval of the Engineer in

Charge.

E) VOLUME CONTROL DEVICE

The opposed blade volume control device shall be made of Powder Coated extruded aluminumconstruction in black anodised finish. Opposed blades shall be pivoted to extruded aluminum frame with

Nylon bushes. Specially designed blade shall have an overlapping lip which shall ensure a tight closure.

F) FRESH AIR INTAKE LOUVERS WITH BIRD SCREEN

The fresh air intake louvers at least 50mm deep will be made of powder coated extruded aluminum

construction. Bird / insect screen will be provided with the intake louvers. The blades shall be inclined at

45 degree on a 40mm blade pitch to minimize water ingress. The lowest blade of the assembly shall be

extended out slightly to facilitate disposal of rain water without falling on door / wall on which it is

mounted.

The intake louvers shall be provided with factory fitted aluminum construction volume control dampers inblack anodised finish.

G) JET NOZZLE

The material of construction of Jet Nozzle shall be aluminium and the angle of swivel of nozzle shall be 30degree from the mean position. The nozzle shall be complete with adopter suitable for circular duct

connection. The nozzle shall be supplied complete with anti smudge design ring on the face of the nozzle.


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The nozzle shall be painted white of finish RAL 9010

3E30 PAINTINGAll ducts collar / shoot behind the grills / diffuser shall be given at least two coats oil black enamel paints.

3e.40 TESTING

The complete duct system shall be tested for air leakage & complete air distribution system shall be

balanced in accordance with air quantities indicated on the approved drawing.

END OF SECTION HVX-03E


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SECTION HVX-03F

STANDARD SPECIFICATION OF THERMAL / ACOUSTIC INSULATION

3F.00 This section deals with supply and fixing of thermal / acoustic insulation of ducts, pipes etc. as per the

specification given in this section.

3F.10 MATERIAL OF INSULATION

The insulation material of the following kind shall be used for cold insulation.

a) CLOSED CELL CROSS LINKED POLYTHYLENE ( XLPE ) FOAM

The Thermal conductivity values in W/m.K of fibreglass shall confirm to following:

Mean Temperature C Density In Kg / Cmt. Thermal ConductivityW/m.k

For Duct Insulation

25C 24 0.033

50C 24 0.039

b) CLOSED CELL CROSS LINKED POLYTHYLENE ( XLPE ) FOAM

For Duct Pipe Insulation

40C 33 0.035 2

c) Expanded Polystyrene for Pipe Insulation

The density of expanded polystyrene shall not be less than 20 kg per cubic meter and the thermal

conductivity shall not exceed 0.031 Kcal./hr.m C at 10 C mean temperature. Adhesive used for the setting

the insulation shall be non flammable, vapour Proof CPRX Compound.

The sample of insulation material shall be submitted for approval to the Engineer in Charge and the sample

shall be tested for thermal conductivity values by the contractor at his own expense. Adhesive used forsetting the insulation shall be non-flammable, vapour proof, CPRX compound.

3F.20 INSULATION ON SHEET METAL DUCTING

The thickness of insulation used on ducting shall be as detailed below:

Conditioned space

a) Supply Air Duct 12 mm thick Closed Cell Cross Linked Polythylene (XLPE) Foam Insulatedwith factory Laminated Al PE Foil.

b) Return Air Duct 9 mm thick Closed Cell Cross Linked Polythylene (XLPE) Foam Insulatedwith factory Laminated Al PE Foil.


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c) Fresh Air Duct 12 mm thick Closed Cell Cross Linked Polythylene (XLPE) Foam Insulatedwith factory Laminated Al PE Foil.

d) Plenums 12 mm thick Closed Cell Cross Linked Polythylene (XLPE) Foam Insulated

with factory Laminated Al PE Foil.

e) FCU Collars 12 mm thick Closed Cell Cross Linked Polythylene (XLPE) Foam Insulatedwith factory Laminated Al PE Foil.

The application of insulation should be carried out in workman like manner as detailed below.

3F.21 INSULATION OF DUCTING WITH ALUMINUM FACED FIBERGLASS

TECHNICAL SPECIFICATIONS OF CLOSED CELL, CHEMICALLY CROSS-LINKEDPOLYETHLENE (XLPE) INSULATION

The insulation material for the ducts, pipe and under-deck insulation shall be Closed Cell Cross-LinkedFire Retardant Polyethlene Foam. The thermal conductivity of the material shall not exceed 0.035 w/mk at

an average temperature of 400c.

Thermal conductivity of the material shall not be affected by ageing, as per DIN 52616. The material mustbe tested for ageing effect in an accredited laboratory for a minimum period of five years to satisfy theageingcriteria.

The material must be in a single layer upto 12 & 09 mm thicknessand not formed by laminating severallayers.

The product will have bending trial and the dimensional stability as per DIN 51949 and DIN 53431 for an

operating range of 400

c to + 1100

c.The density of the material shall be33 +/- 3 kg/m3

or 0.030 gm/cc.

The material shall be rated as Class 1, as per BS476 PART 7. The rating as per DIN 4102shall be B1.Thesmoke density of the material as per AS-1530.3 shall not exceed 1. There shall be no toxicity in theemitted smoke, both under flaming and non-flaming conditions as per AITM 3.000 (1993).

The water vapour permeability, as per DIN 52615, shall not exceed 0.15ng/m.sec.pa

The material shall have a fire approval from CBRI / FIRE advisor (Govt of India)/Chief fire officer.

For providingUVprotection the insulation shall be cladded with minimum 30 micron aluminum PE foil.The cladding shall be factory finished to avoid site work. The minimum thickness will be as per specs.

The ductsurfaces will be thoroughly cleaned prior to applying the insulation. Adhesive of suitable gradeshall be uniformly applied on the insulation and cured, before sticking to the duct. The insulation can be

wrapped around the duct as one piece, where size does not permit the same be cut to exact width/height of

duct.

The duct /pipe insulation joints will be overlapped with a self adhesive tape of the same material. The tape

shall be minimum 2.5mm thick and 50mm wide.


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A self adhesive strip of same material, of suitable thickness (height), to cover the complete height of theflange will be provided around the flanges and the flange joint neatly covered with insulation, so as to

reduce heat loss through flages, in addition to covering the flange connection/joint.

3F.22 ACOUSTIC LINING OF DUCT.

Material shall be engineered Nitrile Rubber open cell foam

The Random Incidence Sound Absorption Coefficient (RISAC); tested as per ISO 354, should be minimum

as per enclosed chart

Freq (Hz) 125 250 500 1000 2000 4000 NRC

10 mm 0.03 0.04 0.14 0.04 0.88 1.00 0.35

15 mm 0.01 0.09 0.29 0.74 1.08 0.83 0.55

20 mm 0.04 0.13 0.4 0.9 1.04 0.90 0.60

25 mm 0.02 0.25 0.86 1.14 0.88 0.99 0.80

30 mm 0.07 0.32 0.99 1.16 0.93 1.08 0.85

50 mm 0.23 0.73 1.29 0.99 1.09 1.11 1.05

The material should be fibre free

The density of the same shall be within 140-180 Kg/m3

It should have Microban*; antimicrobial product protection, and should pass Fungi Resistance as per

ASTM G 21 and Bacterial Resistance as per ASTM E 2180.

The material should have a thermal conductivity not exceeding 0.047 W/m.K @ 20 Deg. C

The material should withstand maximum surface temperature of +850C and minimum surface temperature

of -200C

The material should conform to Class 1 rating for surface spread of Flame in accordance to BS 476 Part 7

& UL 94 (HBF, HF 1 & HF 2) in accordance to UL 94, 1996.

The insulation should pass Air Erosion Resistance Test in accordance to ASTM Standard C 1071-05

(section 12.7).

Thickness of the material shall be as specified for the individual application. The insulation should be installed

as per manufacturers recommendation.

3F.30 INSULATION OF PIPES

The chilled water pipes & condensate drain water pipes shall be insulated with 50 mm & 25 mm thick

expanded polystyrene (density of 20 kg per cubic meter) pipe section respectively. Expanded polystyrene

of TF quality shall be used. The application of insulation on pipes should be carried out in workman like

manner as mentioned below:

3F.31 INSULATION OF PIPES WITH ALUMINIUM CLADDING (INSIDE THE BUILDING)

a) The pipe to be insulated should be cleaned thoroughly with steel brush for removing dirt, rust and

grease.

b)

Apply a coat of Zinc chromate primer and two coats of cold setting adhesive CPRX compound on

pipes.

c) Fix insulation of specified thickness tightly and seal all joints with adhesive compound.


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d)

Insulated surface should be wrapped in two layers with 400G polythene sheet with over lapping

longitudinal & transverse joints.

e)

To apply self adhesive tape for firm holding of polythene sheet in position at interval of 500 mm.

f)

Finish the surface with 0.5 mm thick aluminium sheet fixed with the hand operated roller machine

(Grooving Machine) & finally to be fixed with self tapping screws.

NOTES: NO INSULATION TO BE APPLIED BEFORE LEAK TESTS.

3F.33 INSULATION OF VALVES AND FITTINGS IN CHILLED WATER LINE

All valves, fittings, flanges, strainers etc. in the chilled water line shall be insulated in the same manner as

described above for chilled water pipes with 50 mm thick uniformly cut pieces from slabs of expanded

polystyrene duly aluminium cladded or with sand cement plaster as finalised. Care should be taken to

ensure that no damage would be caused to the insulation when valves or strainers are operated.

3F.40 PUMP AND ACCESSORIES

All chilled water pumps and accessories shall be insulated with 50mm thick expanded polystyrene.

3F.50 EXPANSION TANK

Expansion tank shall be insulated with 50mm thick expanded polystyrene in two layers of equal thickness.

The method of application of insulation shall be same as described for insulation of piping. The final finish

shall be done with 0.5mm thick aluminium sheet cladding.

END OF SECTION HVX-03F


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SECTION HVX-03G

STANDARD SPECIFICATION ON ELECTRICAL MOTORS AND STARTERS

3G.00 This section deals with supply, installation, testing and commissioning of all types of motors used for

pumps, air-handlers, compressors, cooling towers etc. The motor installation, wiring & its control shall becarried out in accordance with the specifications as detailed below.

3G.10 MOTORS

MAKE OF MOTORS

The make of motors shall be as specified in List of Approved Make.

a)

The motor shall be of the following design and should run at all loads without any appreciable noise or

hum.

i)

Totally enclosed fan cooled Sq. Cage.

ii)

Screen protected drip proof wound Sq. Cage motor.

Enclosure and type of motor shall depend upon duty and usage unless otherwise specified.

b)

The winding of motors shall be class F insulation and suitable for local conditions. The insulation of

motors shall confirm to IS:325/1978.

c) All motors shall comply with IS:325, IEC-34.1 or BS 2313, IEC-72.1 for foot mounted motors.

d)

The rating of the motor shall be as indicated in the Schedule of Equipment & Bill of Quantities.The

motors shall be selected on the basis of ambient temperatures and allowable maximum temperaturerise.

e)

Motor above 1HP shall be three phase unless otherwise specified.

f)

All motors shall be rated for continuous duty as per IS:325. Motor shall be suitable for operation on

415 volts 10% volts, 50 5% Hz AC supply (or 230 10% volts, 50 5% Hz for single phase AC

supply).

g)

Motors shall be provided with cable box to receive Aluminum conductors, PVC insulated, PVC

sheathed and armoured cables auitable rised cable eatery berries with in if required shall be provided

for easy-ness of cable termination and adequate space.

h)

All motors shall be provided with combination of Ball and Roller Bearing. Suitable grease nipples for

regreasing the bearing shall be provided.

i)

Motors above 0.25 HP shall be provided with overload protection. Motors above 100 HP shall be

provided with thermal protection and thermistor detector in the starter winding.

j)

The starter current and the type of starter to be used shall be as follows (unless otherwise specified)


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Type of motor Starting Current Starting method

a) Sq. Cage motor 600% of full load D.O.L

up to 7.5 hp current

b) Above 10.0 hp 250% of full load Star / Delta

up to 60 hp current

c) 75 HP & above 200% of full load Closed transition Star / Delta

current

3G.20 MOTOR STARTERS

a)

All starter shall confirm to IS: 13947. The starter shall be enclosed in sheet metal enclosure, which

would be dust vermin proof.

b)

All starter should have suitable range of voltage and frequency.

c)

All starter shall have integral stop/start push button of international colour code.

d) Contactor shall have number of poles as required for appropriate duty. Contacts should be made of

solid silver faced & shall be suitable for at least 40 contacts per hours.

e)

In event of power failure, the starter should automatically disconnect.

f) All starters shall be provided with thermal over load relay.

g)

All star delta starters shall have adjustable timers.

h) Terminal blocks with integral insulating barrier shall be provided for each starter.

i)

All starters shall be provided as specified in Bill of Quantities.All starter shall be compatible tothe drive and driven equipment.

j) Extra contact for interlocking purpose shall be provided in the starter.

3G.30 INSTALLATION OF MOTORS

a)

The motor and drive machine shall be fixed on slide rails to facilitate belt and other adjustments.

b)

Vibration isolation arrangement shall be provided.

c)

The installation of motor shall be carried out as per IS:900.

d) The motor with driving equipment shall be mounted on foundation and connected to each otherwith flexible coupling with guard in condenser & chilled water pumps.


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e) All motor shall be wired as per specifications. Earthing of motor frame shall be done with GI stripsas specified in Bill of Quantities.

f) All motors shall be tested at manufacturers works as per I.S. standard and test certificates shall be

furnished.

g) All motors after installation shall be tested at site for vibrations, heating and electrical insulation

resistance by AC contractor.

END OF SECTION HVX-03G


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SECTION HVX-03H

STANDARD SPECIFICATION OF MOTOR CONTROL CENTRE (MV PANEL), AHU SUB-PANEL, POWER & CONTROL CABLING

3H.00 This section deals with supply, installation, testing & commissioning of Motor Control Centre (MV panel),AHU Sub-Panels etc. & shall be manufactured by CPRI approved venders. The power / control cabling &

earthing work shall be carried out as per the specification given below:

3H.10 SCOPE

All work shall confirm to Indian Electricity Act (amended up to date), I.S. code of practices local rules and

regulations etc. Power cabling shall be carried out with approved make of cables as indicated in the List ofapproved make of equipment / materials and shall be of grade 1100 volts, PVC insulated & sheathed,armoured aluminum conductors cables. Control cabling shall be of approved make and shall be of grade

1100 volts, PVC insulated & sheathed, copper conductor armoured multicore cables as specified in B.O.Q.

3H.20 MOTOR CONTROL CENTRE (MV PANEL) / AHU SUB-PANEL

Motor control centre (MV Panel) floor mounted extendable type & wall mounted AHU sub-panel shall be

fabricated out of 14G C.R.C.A. Sheet. These panels shall be cubical sectionalized type, totally enclosed

dust & vermin proof. Gaskets shall be provided in all joints to prevent dust to reach the internals of the

panels to make it completely dust proof. The degree of protections for panels shall be IP 52 for indoor

applications and IP 55 for outdoor applications as per IS:2147.

These panel (MV) shall be suitable for voltages up to 500 volts, three phase 50 Hz, 4 wire supply capable

of functioning satisfactorily in temperature ranging up to 45 to 50 degree centigrade and rupturing capacity

suitable for connected load & design should be type tested for 42 KA fault level. All joints of panels shall

be welded and braced as necessary to provide a rigid support for all components. The base channel

provided in

Tender Specifications HVAC

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