vsp-6.3-gs-m-7 internal audit

7/27/2019 VSP-6.3-GS-M-7 internal audit

http://slidepdf.com/reader/full/vsp-63-gs-m-7-internal-audit 1/18

RASHTRIYA ISPAT NIGAM LIMITED

VISAKHAPATNAM STEEL PLANTVISAKHAPATNAM

GENERAL SPECIFICATION NO. VSP-6.3/GS-M-07

FOR

FIRE PROTECTION SYSTEMS

APRIL 2006

M. N. DASTUR & COMPANY (P) LTDConsulting Engineers

P-17, Mission Row Extension Kolkata 700 013



VSP-6.3/GS-M-07

RASHTRIYA ISPAT NIGAM LIMITED

VISAKHAPATNAM STEEL PLANT

VISAKHAPATNAM

GENERAL SPECIFICATION

for

FIRE PROTECTION SYSTEMS

1.0 SCOPE

1.1 This specification covers the fire protection systems requiredfor various units. The term ‘fire protection system’ generally covers various equipment, system and related facilities forAutomatic Detection and Alarm system, Automatic FireExtinguishing system, various kind of Fire Extinguishers,Fire Tender, Foam Tender etc. These include the facilities of Fire Brigade Station and its auxiliary facilities, variousautomatic fire extinguishing systems using water spray systems, carbon dioxide total flooding system, clean agentgas total flooding system emulsifier transformer protectionsystem complete with all accessories.

1.2 The selection, design and construction of the fire protectionsystems shall be suitable in every way for the purposeintended and shall be oriented towards maximizinginterchangeability of components and minimizingmaintenance. Each system shall be complete in all respectsincluding all accessories essential for proper installation,operation and maintenance, irrespective of whether suchsystems are specifically mentioned in the technical andGeneral Specifications.

1.3 In the interest of standardization, Purchaser reserves the

right of selecting a particular equipment and/or componentsof fire protection system and the Contractor shall supply equipment/components of the particular make, if sorequired.

2.0 STANDARDS

2.1 The fire protection systems shall be designed, manufactured,erected, tested and commissioned as per the standards laiddown in this specification. Detailed instructions on suchaspects as are not included herein shall be as per the codesand practices adopted by the relevant International

Standards and Indian Standards. These shall be clearly indicated by the Contractor and Consultant’s approval shallbe obtained.

1 of 17



VSP-6.3/GS-M-07

2.2 All equipment shall also conform to the provisions of statutory and regulations in force such as Indian ExplosivesAct, Indian Factories Act and stipulation of Tariff Advisory

Committee including latest revisions if any.

2.3 The items covered in Indian Standards shall bear the ISIcertification marks to ensure that all the prerequisites asregards quality, safety and warranty of the items have beenfulfilled.

2.4 The tenderer shall also ensure that his company has at-leastfive (5) years experience in the field of sophisticated Fire

Detection and Protection system. Necessary certificate in thisconnection shall have to be submitted by the tendered along

with the offer.

2.5 The norms indicated in this specification shall be adhered to,unless adoption of these norms would vitiate the functionand/or safety of the systems offered. In such cases and/orwhere different norms are adopted by the Contractor, thesame shall be clearly indicated with reasons andConsultants’ approval obtained.

3.0 DESIGN BASIS

3.1 The plant fire-fighting system shall be mainly based on the

use of water as the main fire-fighting medium. In addition,for special applications, fire–fighting media such as carbon-dioxide, foam, clean agent shall be used.

3.2 Fire Hydrant System

The steel plant area will be covered by fire hydrants generally laid underground alongside plant roads as well as insideshop/building, in the form of ring mains. Dedicated waterbased fire-fighting system comprising of fire water storagetank, fire pumps and fire water ring main shall be provided

for each major shop. The fire fighting system shall bedesigned as per the guidelines indicated in fire protectionmanual of Tariff Advisory Committee. The fire water pumpsshall operate automatically sensing line pressure.Hydropneumatic tanks may be installed to reduce number of

start/stops of the jockey pumps.

3.3 In case of any major fire in any area, the fire brigade stationshall be informed immediately and for this purpose specificcommunication channels shall be provided between fire-brigade station and various shop/unit.

3.4 In addition, special fire-fighting facilities shall beincorporated for certain areas.

2 of 17



VSP-6.3/GS-M-07

3.4.1 Automatic carbon dioxide total flooding system orInergen/Argonite shall be provided for un-manned Controlrooms, Hydraulic rooms, Hydraulic cellars with special

arrangement of exhaust systems. The system shall have100% standby cylinder with gas.

3.4.2 Automatic clean agent total flooding system e.g. IG-541(Inergen) & IG-55 (Argonite) shall be provided in thesophisticated control room/computer room and other highvalue assets with 100% standby cylinder with gas.

3.4.3 Automatic foam spraying system shall be provided for large

stationary storage tanks for inflammable liquids.

3.4.4 Automatic High velocity water spray system shall be providedfor the Transformers higher than 10 MVA capacity or the oilfilled transformers with oil capacity higher than 2000 liters.

The water spray deluge valve house shall be located outsidethe Transformer fire Zones and protected from radiant heatand other fire effects. The actuation of this system shall beautomatic but manual operating valves shall also beprovided.

3.4.4.1 The high velocity water spray system for the transformersshould be well designed to have adequate coverage of theentire transformer unit including the conservation tanks, the

bushings and the bottom area.

3.4.5 Automatic fire detection and alarm system shall be providedfor all the electrical rooms, computer rooms, control rooms,control pulpits, Sw. Gear rooms, MCC rooms, Transformerrooms, cable basements, cable tunnels, cable galleries,hydraulic rooms, hydraulic cellars etc. Signals and alarms isto be forwarded in the central fire brigade station also.

3.4.5.1 Conventional type Automatic Fire Detection & Alarm systemshall be provided. In the event of any fire corresponding

Detectors/MPS shall initiate audio-visual alarms at the localareas for evacuation and after a time delay spraying of gas/clean agent or water flooding shall start automatically.

3.4.5.2 All equipment related to the conventional type Automatic

Fire Detection and Alarm system shall have UL/FM approvaland system shall be designed as per NFPA-72.

3.4.5.3 Photoelectric-cum-heat detector (multi-sensor detector) andHeat Detector with Rate of Rise-cum-fixed temperature typeshall be provided for all the areas.

3.4.5.4 All detectors and devices shall be connected with class ‘A’ wiring (i.e. ring circuit)

3 of 17



VSP-6.3/GS-M-07

3.4.5.5 Electronic Hooter shall be provided with Strobe.

3.4.5.6 Manual Pull Station shall be provided in all the entry andexist points at 1.4M height for all the areas in addition to all

electrical buildings, cable tunnels, Hydraulic Cellars/roomsetc. where FDA system is being provided.

3.4.5.7 Response Indicator shall be provided where the detectors arelocated in above false ceiling and below false floor areas.

3.4.5.8 Fire alarm panels shall have LCD display in addition to LEDdisplay along with digital Amp. Meter and Volt meter .

3.4.5.9 Repeater panels shall be provided for all important placeswhere fire alarm panels are not available.

3.4.5.10 Mimic panel with area graphic display shall be provided inthe Central Fire Brigade Station considering all the fireZones.

3.4.5.11 Conventional Fire Alarm Panel (FAP) shall have degree of protection IP55 and sheath steel shall be 2mm thick. TheFAP shall have spare Zone in addition to the required Zone.

3.5 YARD/SHOP FIRE HYDRANTS

3.5.1 All hydrants shall be laid strictly as per the fire protection

manual of Tariff Advisory Committee (TAC)

3.5.2 All hydrants outlets shall be situated 1 m above groundlevel. The stand posts shall be 80 mm in diameter for singleheaded hydrants and 100 mm for double headed hydrants.

The stand-posts shall be painted ‘fire red’ (shade No. 536 asIS-5)as per TAC standards and shall be plate weldednumbered for easy identification. Separate Isolator valve tobe provided in the riser pipe.

3.5.3 One hydrant post shall be provided for every 60 m of external

wall measurement in case of Light Hazard Occupancy, forevery 45 m in case of Ordinary Hazard Occupancy and forevery 30 m of external wall measurement in case of HighHazard Occupancy.

3.5.4 Hydrant shall be provided on every floor landing. The mainsfeeding the landing hydrants shall be provided with a cut-off valve at ground level.

3.5.5 For use with each hydrant on staircase landing or with eachinternal hydrant, two lengths of hose 7.5 m shall be providedin a box.

4 of 17



VSP-6.3/GS-M-07

3.5.6 Spare hose with a minimum quantity of 30 m shall be alwayskept readily available. Such spare hose shall also be in 15mlengths readily attached to couplings.

3.5.7 Hose is kept in hose boxes alongside hydrants, each boxshall contain two lengths of 15 m each.

3.5.8 Only oblique hydrants conforming to IS-5290, Type A withoutlets angled towards ground shall be used. The hydrantcouplings shall be used. The hydrant couplings shall be of stainless steel of the instantaneous spring –lock (female)type of 63 mm dia. and valves shall be of the screw downtype.

3.5.9 Branch pipe/nozzle of monitor shall be of stainless steel.

Aluminum, gun metal coupling, branch pipes and nozzles areprohibited.

3.5.10 Water shall be available immediately to all hydrants/fixedmonitors at all times, with all cut-off valves being kept open.Before final inspection, the Hydrant system shall be flushedthoroughly.

3.5.11 In the case of riser mains in storied buildings and inlocations where it is not feasible to lay a ring main, aterminal main may be provided, but in no case shall thenumber of hydrants on such terminal mains exceed 5.

3.5.12 Cut-off (Isolating) valves are necessary to obtain the bestpossible pressure at the seat of fire as they enables adamaged portion of the installation to be isolated whilst fullpressure is available throughout the remainder. These valvesare distributed according to the general layout of theinstallation and not according to fixed rules. For this reason,the proposed position of these valves shall have the priorapproval of the Committee. Cut-off valves shall conform to IS14846-2000.

3.5.13 Double headed hydrant shall consist of two separate landingvalves. A single control valve shall not be permitted.

3.5.14 Storage of material in the open shall be protected as under:

Metals, metallic goods, machinery : One single hydrant forand other non-hazardous storage every 60 m of the

storage periphery located beyond 2 mbut within 15 m of storage area

5 of 17



VSP-6.3/GS-M-07

Coal or coke : One single hydrant forevery 45 m of thestorage periphery located beyond 2 m

but within 15 m of storage area.

Other storage : One double hydrantfor every 45 m of thestorage periphery located beyond 2 mbut within 22.5 m of storage area.

3.5.15 Type of hydrant to be considered are as follows:

Yard : Double headed hydrant

Inside shop : Single headed hydrant

Staircase : Single headed hydrant

Tall columns, structure, towers, : Monitoretc more than 15 m high, whereit is not possible to provide accessstaircase with hydrant

3.5.16 A layout drawing indicating the location of all the hydrantvalves to be submitted for each shop/area with bill of quantities.

3.6 FIRE WATER STORAGE AND SUPPLY

3.6.1 Water for the hydrant service shall be stored in an on-groundRCC storage tank. Capacity of the tank shall be selectedconsidering the requirements indicated below:

Sl. Capacity of static storage exclusively

No. Nature of risk reserved for hydrant service

1. Light hazard Not less than 1 hour’s aggregatepumping capacity with a minimum of 135,000 litres (Useful volume)

2. Ordinary hazard Not less than 2 hour’s aggregatepumping capacity (Useful volume)

3. High hazard (A) Not less than 3 hour’s aggregatepumping capacity (Useful volume)

4. High hazard (B) Not less than 4 hour’s aggregatepumping capacity (Useful volume)

6 of 17



VSP-6.3/GS-M-07

NOTE:

(1) Types of the hazard shall be determined as per thestipulations indicated in fire-protection manual of

Tariff Advisory Committee, relevant BIS.

(2) The capacity of the reservoir for ordinary and highhazard class occupancies shall not be reduced by thequantum of inflow.

(3) In case of light hazard class occupancies the minimumcapacity of the reservoir shall be increased to 225,000litres if the highest floor of the building is more than15 m above the surrounding ground level.

3.6.2 Tanks of and over 225,000 litres capacity shall be in two (2)

interconnected equal compartments to facilitate cleaning andrepairs.

3.6.3 Where the tank consists of two (2) compartments, tappingshall be taken from both the compartments and shall beconnected through sluice valves to a common suction

header. The pumps, in turn, shall draw their suction fromthe common header through sluice valves.

3.6.4 For supply of water for special fire extinguishing systemslocated at different areas of the plant suitable storage tanksfor water supply as per the requirement stipulated in TAC

shall have to be provided.

3.6.4.1 Water for the spray system shall be stored in any easily accessible surface or underground lined reservoir or aboveground RCC tanks.

3.6.4.2 Common reservoir/tank for all other systems such assprinkler installation and hydrant system as well as spray systems may be provided subject to the following condition.

• All the suction inlets are at same level.

•

Aggregate capacity of the reservoir shall be equal tothe total requirement of all the systems.

3.6.5 The hydrants main shall be normally laid underground or inmasonry culverts with removable covers of incombustibleconstruction. For sizing of the mains Fire Protection Manualas per Tariff Advisory Committee is to be followed.

3.7 APPLICABLE STANDARD

3.7.1 Fixed water spray system for fire protection shall conform toNFPA-15 and TAC.

3.7.2 Automatic CO2 total flooding system shall conform toNFPA-12.

7 of 17



VSP-6.3/GS-M-07

3.7.3 Automatic clean agent total flooding system shall conform toNFPA-2001.

3.7.4 Automatic foam spraying system shall conform to NFPA-

11/11A.

3.7.5 Automatic Fire Detection and Alarm system shall conform toNFPA-72, IS-2189 & TAC.

3.7.6 Non-percolating flexible fire fighting delivery hose IS-636.

3.7.7 Specification for blower and exhauster for fire fighting IS-941.

3.7.8 Functional requirements for emergency (rescue tender) for firebrigade use IS-944.

3.7.9 Functional requirements for Water Tender type B for firebrigade use IS-950.

3.7.10 Code of practice for fire safety of buildings (general) : Generalprinciples of fire grading and classification IS-1641.

3.7.11 Code of practice for fire safety of buildings (general): Detailsof construction IS-1642.

3.7.12 Code of practice for fire safety of buildings (general):Exposure hazard IS-1643.

3.7.13 Code of practice for fire safety of buildings (general): Exitrequirements and personal hazard IS-1644.

3.7.14 Code of practice for fire safety of buildings (general):Electrical installations IS-1646.

3.7.15 Code of practice for selection, installation and maintenance of automatic fire detection and alarm system IS-2189.

3.7.16 Code of practice for selection, installation and maintenance of

portable first-aid fire extinguishers IS-2190.

3.7.17 Specification for branch pipe, universal for fire fightingpurposes IS-2871.

3.7.18 Code of practice for fire safety of industrial buildings. Generalstorage and warehousing including cold storage IS-3594.

3.7.19 Code of practice for installation and maintenance of internalhydrants and hose-reels IS-3844.

3.7.20 Specification for unlined flax canvas hose for fire fighting

IS-4927.

8 of 17



VSP-6.3/GS-M-07

3.7.21 Specificat ion for foam concentrate (compound) for producingmechanical foam for fire fighting : Part 1 Protein foam IS-4989.

3.7.22 Specificat ion for foam concentrate (compound) for producingmechanical foam for fire fighting : Part 2 Aqueous filmforming foam (AFFF) IS 4989-Part-2.

3.7.23 Specificat ion for foam concentrate (compound) for producingmechanical foam for fire fighting : Part-3 Fluoroprotein foamIS-4989.

3.7.24 Specification Smoke Detectors for use in automatic electrical

fire alarm system IS-11360.

3.7.25 Code of practice for fire protection of cable runs IS-12459.

3.7.26 Code of practice for provision and maintenance of externalhydrant system IS-13039.

3.7.27 Specification for landing vales IS:5290-1993.

3.8 PORTABLE/MOBILE FIRE EXTINGUISHERS

3.8.1 First –Aid portable/mobile fire extinguishers shall be providedas per IS-2190. While selecting the fire extinguishers indifferent areas in different areas the following type and

capacity may be considered.

• CO2 type fire extinguishers : 2kg/3kg/4.5kg/6.5kg/22.5kg

• DCP type fire extinguishers : 2kg/5kg/10kg

• ABC powder fire extinguishers : 3kg/ 5kg

• Foam type fire extinguishers : 9 ltr.

3.9 OTHER MEASURES

3.9.1 The fire protection measures for each shop or unit shallinclude the following measures in addition to the otherfacilities.

3.9.1.1 Sign boards to indicate fire hazard areas/equipment, thetype of fire hazard and other prohibited action such as ‘NoSmoking’ sign.

3.9.1.2 Total system display boards to be installed in the strategicplaces.

3.9.1.3 Schematic drawing indicating operating instruction boards tobe installed.

9 of 17



VSP-6.3/GS-M-07

3.9.1.4 Caution instruction boards are to be displayed in each shopfor gas fire, oil fire, electrical fire etc.

3.9.1.5 Help line boards to be displayed with Department Phone no.,

fire brigade phone no., ambulance phone no, central controlhospital phone no.

3.9.1.6 Evacuation signal during gas discharge.

3.9.1.7 Fire escape doors/routes for occupants as per IS-12459

3.9.1.8 Fire Alarm shall have the provision for transmitting the firesignal to the Fire Brigade Station.

3.9.1.9 Auto-dialing facilities during fire.

3.9.1.10 Interlocking with ventilation/AC system in occurrence of fire.

3.9.1.11 Draining and venting arrangements for the fire affected zoneafter quenching of fire.

3.9.1.12 Main Fire Alarm Panel shall have provision of transmittingthe signal to the remote station, interfacing with the otherPanel/PLC/BMS/SCADA system.

3.9.1.13 Instructions on specific action to be taken by working staff in case of fire, and facilities for execution of the assignedresponsibilities, including facilities for fire drills. Monthly fire drill chart board to be displayed.

3.9.1.14 All necessary equipment related to the various operationand maintenance of FDA system shall have to be porvided.

3.9.1.15 Operation and Maintenance manual for all the equipmentand system shall have to be provided.

3.9.1.16 All necessary step down transformers and other conversionequipment shall have to be provided to match withpurchases or main power supply.

4.0 EQUIPMENT

4.1 PUMP

4.1.1 Horizontal centrifugal pump complete with motor/engine andaccessories shall be provided to supply water to the plant firewater mains. The rpm of pump shall not be more than 1500.

The type of pumps shall be horizontal split easy type.

4.1.2 In addition to the automatic starting operation, provision

shall be kept for manual starting and stopping of the pumps.Auto-manual selector switch shall be provided for changeover from manual to automatic operation and vise-versa.

4.1.3 Capacities and discharge heads of the pumps shall beselected as per the guidelines indicated in Fire ProtectionManual issued by Tariff Advisory Committee/relevant BIS.

10 of 17



VSP-6.3/GS-M-07

4.1.4 Pumps selected shall be capable of furnishing not less than150% of rated capacity at a head of not less than 65% of therated head. The shut-off head shall not exceed 120% of rated head.

4.1.5 In case of electrically driven pumps it is recommended thatcompression ignition engine driven stationary pump of similar capacity be installed as a stand-by and vice versa.However, where the hydrant service consists of more thanone pump, not more than half the total number (totalnumber + 1 in case of odd number) of pumps shall haveprime movers of one type.

4.1.6 The pumping arrangements shall also incorporate jockey totake care of system losses. The capacity of the jockey pumpsshall be not less than 5% thereof (with a minimum of 10.8 cu

m/hr), unless the aggregate installed pumping capacity is inexcess of 820 cu m/hr, in which case the capacity of jockey pump(s) shall be not less than 25 cu m/hr plus 1% of theinstalled pumping capacity in excess of 820 cu m/hr.Installation of Jockey Pump also helps to prevent hydraulicsurges.

4.1.7 Diesel engine driven pumps shall be provided as per theparticulars indicated in ‘Fire Protection Manual’ of Tariff Advisory Committee.

4.1.8 Discharge pressures of the pumps shall be selected

considering the following design criteria:

For high hazard occupancies, the hydrant system shall behydraulically so designed that where half the aggregatepumping capacity is being discharged at the farthest/hydraulically most remote point and the other half in themost vulnerable area enroute, a minimum running pressureof 5.25 kscg is available at the former point and the rate of flow of water does not exceed 3.5 m/second anywhere in thesystem.

In case the hydraulically most remote point is the area

determining the fire pump capacity, the entire aggregatepumping capacity shall be considered as being discharged atthis point at a minimum running pressure of 5.25 kscg andthe hydrant system shall be so designed that the rate of flowof water does not exceed 3.5 m/second anywhere in thesystem.

In case the hydraulically most remote point happens to beordinary/light hazard occupancy, the pressure requirementat this point can be restricted to 3.5 kscg. However,pressure available at the high hazard area immediately

preceding the ordinary/light hazard area must be 5.25 kscg.

11 of 17



VSP-6.3/GS-M-07

4.2 HYDROPNEUMATIC TANK

4.2.1 Vertical cylindrical tank conforming to ASME/NFPA codeshall be provided. A water level gauge shall be attached to

the side of the tank. All joints shall be made carefully andcompletely air tight. Water inside the tank is kept at therequired pressure with the help of compressed air takenfrom the air receiver of the compressor. Drain valves, ventvalves, relief valves shall be provided to the tank as per therequirement. Float switches, pressure indicator with contactsshall be provided with the tank to satisfy the operation of

Jockey pump and solenoid valves.

4.2.2 The air compressors provided for charging the hydro-pneumatic tank shall be preferably of receiver mounted,

reciprocating, electric driven, base frame, V-belt withmetallic guard etc. The compressors shall be provided withautomatic ‘start’ ‘stop’ control. It shall also have provisionfor manual starting. The design, manufacture and testing of the air receiver shall be in-accordance with the latestrevision of ASME/NFPA code.

4.2.3 The air compressor shall be air cooled type complete suctionfilter, lubricating arrangement and all other relatedaccessories for perfect operation of the system.

4.3 PIPEWORK FOR FIRE EXTINGUISHING SYSTEM

4.3.1 Pipe work for Automatic Sprinkler System, Automatic Gastotal flooding system and Hydrant system shall conform toGeneral Specification for Pipe work (VSP-6.3/GS-M-01 )

4.4 WATER SPRINKLER EQUIPMENT FOR MEDIUM VELOCITYWATER SPRAY SYSTEM

4.4.1 Medium Velocity water spray system shall be providedmainly to provide cooling and/or exposure protection to suchrisks of fires involving flammable fluids e.g. Horizontal

storage vessels, Vertical storage vessels, Spherical storagevessels etc. having flash points below 650C. These 650Csystems are also used sometimes for power stationapplications in coal conveyors. Cable galleries etc.

4.4.2 The sprayers shall not be less than 6 mm in orifice size andshall normally have cone angles between 600 and 1250.

4.4.3 Minimum and maximum pressure in the network shall be 1.4bars and 3.5 bars respectively.

12 of 17



VSP-6.3/GS-M-07

4.4.4 Sprayers shall be installed normally to the exposed areas of the vessel and positioned at distance as per the sprayerapplication guideline of TAC. However, Sprayers need not beinstalled normal to the surface for protecting the ends of the

vessels.

4.4.5 Vessels shall be spaced at more than 15 M from each other.In such cases, the water demand for the largest vessel shalldetermine the pumping and water requirements If this iscontravened, the aggregate water demand for all suchvessels falling within the prescribed distance of each othershall be the determining factor.

4.4.6 The protection network shall be fabricated in the form of horizontal rows of sprayers connected by piping, in rings.

The number of rows required shall be governed by thediameter of the vessel, in accordance with the SprayerApplication Charts as per TAC.

4.5 WATER SPRINKLER EQUIPMENT FOR HIGH VELOCITYWATER SPRAY SYSTEM

4.5.1 High Velocity water spray system shall be provided mainly toextinguish fire involving liquids with flash points of 650C orhigher. Three principles of extinguishment are employed inthe system for emulsification, cooling and smothering. Theresult of applying these principles is to extinguish the fire

within a few seconds.

4.5.2 Transformers shall be protected using rings of nozzles therearound with the top of the transformer and subsequently rings for every 3M from top to bottom thereof.

4.5.3 Projectors shall be employed to spray water horizontally atthe bottom if the transformer is at more than 300mm aboveground level.

4.5.4 If transformers are surrounded by concrete or asphalt

surfaces, projectors must be employed in such a way as towash off flammable liquids away from transformers.

4.5.5 The projectors shall not be less than 6 mm orifice in size.

4.5.6 Projectors protecting the top shall be aimed at an angle sothat all of the water impinges upon the transformer, thespray pattern targeting either the top of the transformer orpartly the top and partly the sides.

13 of 17



VSP-6.3/GS-M-07

4.5.7 Projectors protecting the space between transformers andradiators and /or space between radiators shall be so locatedas to spray directly into the open space.

4.5.8 The system shall be hydraulically so designed that thepressure at the hydraulically most remote projectors in thenetwork is not less than 3.5 bars in case of an Outdoor

Transformer and 2.8 bars in case of an Indoor Transformer.However the maximum pressure in any Projector within anetwork shall not exceed 5 bars. The velocity in the feed pipesshall not exceed 10M/second.

4.6 PORTABLE/MOBILE FIRE EXTINGUISHERS

4.6.1 Portable/Mobile fire extinguishers shall be provided in

different areas of the plant area in adequate quantities as perthe requirement. All portable/mobile type fire extinguishersshall conform to relevant Indian Standards.

4.6.2 All portable/mobile fire extinguishers shall be provided as perIS-2190.

4.6.3 Each fire extinguisher shall have the instructions foroperating the extinguisher on its body itself.

4.6.4 All fire extinguishers shall be supplied with initial charge andaccessories as required.

4.6.5 Portable fire extinguishers shall be provided with suitableclamps for mounting on walls or columns.

4.6.6 All portable type fire extinguishers and fire buckets and itsequipment shall conform to relevant IS standard.

4.6.7 All fire extinguishers shall have IS marking andcertification.

4.6.8 All equipment covered herein shall be provided in accordance

with the Indian Standards.

4.6.9 Carbon dioxide type fire extinguishers shall comprise of highpressure steel cylinder body complete with wheel type valvewith ISI marking, braided reinforced hose, non-conducting

horns and accessories, wall mounting brackets/portabletyped trolley. The extinguisher shall have ISI marking.

14 of 17



VSP-6.3/GS-M-07

4.6.10 Dry Chemical Powder type fire extinguishers shall comprise of suitable thickness sheet steel body, strictly conforming to ISspecification coated with leaded tin alloy internally andexternally an inner container, a carbon dioxide gas cartridge,

a plunger rod for carbon dioxide release, a high pressuredischarge hose with a squeeze nozzle holster, fixing bracketsand other accessories. The extinguishers shall have ISImarking.

4.6.11 Foam type fire extinguishers shall comprise of suitablethickness sheet steel body, strictly conforming to ISspecification, coated with leaded tin alloy internally andexternally complete with G.M Union, inner coating, fixing

brackets and initial refill with ISI marking. The extinguishershall have ISI marking.

5.0 PASSIVE FIRE PROTECTION

5.1 The passive fire protection requirement for such assegregation of cable runs into compartments, use of fireresistant cables in critical areas and group of cables, sealingof penetrations in the walls and floors by use of fire stops incable galleries, cable tunnels, cable basements etc shallconform to the provision in IS 12459.

5.1.1 In order to prevent vertical/lateral spread of fire throughcables, all cable tunnels. galleries through which cable/cable

trays are normally laid, should be subdivided into smallercompartments irrespective of type of cable used. This shouldbe done by provision of walls at interval not more than 30 mand by sealing the apertures openings with the use of firestops. The fire rating of fire rating of fire stop when testedaccording to the method given in IS-12458.

5.1.2 The fire barrier wall should not be less than the rating of building component as per IS 3809. Passage through barrierwall should be provided with fire check doors of the same firerating.

5.1.3 No other services than that of fire protection should beallowed in the cable tunnels. All cable runs should beprovided with adequate number of fire escape evenly distributed so that the maximum distance for man trapped in

fire does not exceed 30 m to the nearest fire.

5.1.4 Cable runs laid in open spaces of the building wherecompartmentation is not feasible should be provided withbarriers. Physical barriers not less than 1 m in length shouldbe provided at intervals not more than 30 m. Barriers shouldbe provided, where the cable change direction and at cable

crossings. The fire resistance of barriers should be same asthe type of construction of the building.

15 of 17



VSP-6.3/GS-M-07

5.1.5 Penetration fire stop is a specific construction consisting of the materials that fill the opening around penetrating items,such as cables, cable trays, conduits, ducts and pipes, andtheir means of support through the wall or opening to prevent

spread of fire.

5.1.6 The critical areas such as after end termination or joints upto a length of not less than 1 M in either direction shall becovered by fire stop.

CLEAN AGENT AUTOMATIC FIRE FIGHTING SYSTEM

6.0 EQUIPMENT SPECIFICATION

6.1 INTRODUCTION

6.2 Automatic Clean Agent such as IG-55(Argonite) andIG-541(Inergen) based Automatic Fire Protection system forall computer rooms and other sophisticate controlroom/electronic room.

6.3 Clean agent based automatic fire protection system shall beprovided as per NFPA – 2001.

6.4 While designing the system the concentration level shall notexceed the NOAEL and LOAEL level as per the global warningand NFPA guidelines.

6.5 In the design of total flooding system, the characteristics of the protected enclosure shall be considered.

6.6 The area of unclosable openings in the protected enclosureshall be kept to the minimum.

6.7 To prevent loss of agent through openings to adjacent hazardsor work areas, openings shall be permanently sealed orequipped with Automatic closures. Where reasonableconfinement of agent is not practicable , protection shall be

expanded to include the adjacent connected hazards or workareas or additional agent shall be introduced in to theprotected enclosure using an extended dischargeconfiguration.

6.8 While designing of the system 100% stand by shall beconsidered.

6.9 The minimum design rate of application shall be based on thequantity of agent required for the desired concentration andthe time allotted to achieve the desired concentration.

16 of 17



VSP-6.3/GS-M-07

6.10 The cylinder valves may be actuated by one of the followingmeans:

• Electric Solenoid (preferable)

• Pneumatic

• Local manual release at the control head

6.11 The nozzles shall be designed 1800 Wall Mounted and 3600

Ceiling mounted types.

6.12 The amount of agent required to achieve the designconcentration shall be calculated based on NFPA. The flowrate and the correct concentration of agent to be achievedwithin 10 seconds throughout the protected zones, computerprogrammed calculation shall have to be furnished.

6.13 Prior to acceptance of the system, technical documentationsuch as the system design manual, test reports, or listingreport shall be presented to the client. This documentationshall show that the system and its individual components arecompatible, employed within the tested limitations andsuitable for the area to be protected.

17 of 17

vsp-6.3-gs-m-7 internal audit

Documents