design report (hk)

FINAL DESIGN - E&M SERVICES CONTRACT: BADD4(A)

4. FIRE PROTECTION SYSTEM

4.1 Introduction

Fire protection system is mandatory for public places like the underground metro station and provides the necessary safety for people and property from fire at any place in the station by providing necessary equipment for early detection and suppression of fire. Also, the fire protection system provides support, in the event of major fires, to the local fire service for extinguishing the fire.

The system is to cover the entire station, ancillary building and tunnels. It is interfaced with fire detection and alarm system and BMS as per operational requirement.

4.2 Scope

Design of integrated Fire Protection System which specifically addresses the following:

Fire Water Tanks & PumpsStand pipes/ Hydrants & Hose Reels SystemAutomatic Sprinklers/ Spray Nozzles SystemInert Gas Flooding SystemPortable Fire ExtinguishersNecessary interfaces with Fire Alarm and building management systems

4.3 Design Standards and References

NFPA-130 (Standard for Fixed Guideway and Passenger Rail System) is followed primarily. Design of system / sub-systems conform to the following:

Fire Water Tank Capacity : NFPA 13 & 14Fire Water Pump for Sprinklers : NFPA 13 & NFPA 20Fire Water Pump for Hydrants : NFPA 14 & NFPA 20Hydrants, Hose reels, & Distribution Piping : NFPA 14Sprinklers / Spray Nozzles & piping : NFPA 13 & NFPA 15Inert Gas Flooding System : NFPA 2001Portable Fire Extinguishers : NFPA 10 / IS: 2190

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4.4 Design Criteria

Fire protection system is designed in accordance with NFPA-130, National Building Code of India and ODC.

a) Fire Hydrant and Sprinkler System as per NFPA-14 and 13 respectively.

b) Fire Tanks and Fire Pumps capacity as per NFPA-13 and 14.

c) Portable Fire Extinguishers are provided as per provision of National Building code of India. The installation is also to have consent of Delhi Fire Service Authorities.

d) Gas Flooding System is in compliance with requirement of Montreal Protocol. Gas used is clean extinguishing agent as per NFPA-2001 and have zero ozone depleting effect.

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4.5 Design Methodology

4.5.1 The basic design is to ensure that:-

a) A fire incident doesn’t occur, by eliminating use of combustible materials in the construction work so that the fire load is minimized. Also electrical distribution system/circuitry is designed so as to minimize the incidences of ‘Short Circuits’- the most common cause of igniting fires.

b) Early detection and warning :- If at all fire takes place there will be an elaborate ‘Fire Detection & Alarm System’ to enable the concerned people to get early warning and to locate and kill a fire in its incipient stage itself.

c) First Aid Fire Extinguishment: - There would be first aid fire fighting equipment like Portable Fire Extinguishers and First Aid Hose Reels which can be operated by station staff (i.e. not necessarily by Professional Fire fighters). These equipments are being provided in easily accessible locations all over the Station Box. The basic strategy is to see that a person doesn’t have to walk more than 30m to reach Portable Fire Extinguishers or First Aid Hose Reel, which all will be placed in conspicuous locations.

d) Should the fire not be controlled by first-aid fire fighting equipments, built-in comprehensive fire fighting measures will be provided in the form of Automatic Sprinklers/Spray Nozzles and Fire Hydrants. Automatic Sprinklers would be provided in all fire prone areas including Escalators, Refuge/Garbage Room etc. These sprinklers would burst (on reaching a predetermined temperature) spraying water on the fire below extinguishing it. For fires on board the Train, Fixed Spray Nozzles would be provided below the Platform Sill at every 2.5m. These spray Nozzles would be activated through a motorized Valves (with remote operation) spraying water in the undercarriage area (the most fire prone part) of the Cars.

e) Hydrants to be operated by Delhi Fire Service or by trained staff of the station would be provided in easily accessible locations so that no part of the station box is more than 30m away from a Hydrant Valve. Fire hoses with couplings and Branch Pipes would be provided in a Hose Cabinet placed in a handy location near every Hydrant.

f) In areas like Auxiliary Sub-stations, where permanent and extensive damage may occur due to water spray, Inert Gas Flooding to extinguish the fire would be provided. The Inert Gas Flooding System would be designed to reduce the concentration of oxygen in the protected room to 12.5% i.e. well below the combustion sustaining

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limit. There would be pre-warning signal for the Occupants to evacuate before gas flooding takes place. ‘Abort’ switch shall also be provided to abandon the ‘Gas Flooding’ in case of a false alarm.

g) While the various passive fire protection & life safety measures like use of non-combustible materials in construction, compartmentation, smoke/fire check doors etc; fire detection and alarm system; smoke ventilation and emergency evacuation of people etc. are dealt with elsewhere, this Chapter of the Report mainly focuses on active fire fighting measures as enumerated in para 4.2 above.

4.5.2 Category of Hazard: For an underground station with construction of non-combustible materials and stack height in store rooms not exceeding 2.40m, category of fire hazard as (Ordinary or Medium Group-1) is perceived.

4.5.3 Extent of Fire Protection Systems: In addition to an elaborate Fire Detection & Alarm System (fully described in Chapter 5 of this Report) for early detection and warning the underground stations of Delhi Metro-Phase-II are being provided with the following fire fighting systems.

i) Hydrants & Hose Reels Systemii) Automatic Sprinklers / Spray Nozzles Systemiii) Inert Gas Flooding Systemiv) Portable Fire Extinguishers

Codes being followed:

As already stated in para 4.3 the primary code followed in the design of fire protection systems is NFPA-130. The codes being followed for individual fire protection systems are also shown in para 4.3. Other NFPA codes would be followed as may be relevant.

Further the standards or regulations/rules of all local authorities would be followed, where they are relevant. These include

Delhi Fire Service, Chief Electrical Inspector for Delhi MRTSNational Building Code of India.

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4.5.4 Details of individual systems:

a) The Fire Detection & Alarm System is described fully in chapter 5

b) Water Based Fire Fighting Systems:

1) Fire Water Tanks (common for hydrants and sprinklers system):- The required quantity of Fire Water is established as per NFPA-13 and NFPA-14.

The tank shall be in 2 halves for ease of periodic cleaning. To prevent stagnation of water, domestic water capacity is added to these two halves such that water at higher level is utilized for domestic water consumption leaving sufficient volume of water reserved for fire fighting.

The combined Fire & Domestic Water Tanks shall be equipped (in addition to the provision for automatic level control for water pumps) to detect low level or high level and to feed signal for alarm at the pumps panel and also to the Scada/BMS.

2) Hydrants Pumps (1 Working + 1 Standby)

The rate of flow of these pumps is established as per NFPA-14. Likewise the head of these pumps would be established to provide a residual pressure of 6.9kg/sq.cm at the farthest and highest hydrant valve. Calculations for arriving at the required head would be made as per NFPA-14.

Both the pumps (working as well as standby) shall be electrical as two independent electric supplies are available.

3) Sprinkler Pumps (1 Working + 1 Standby)

The rate of flow of these pumps is established as per NFPA and ODC of DMRC. The head of these pumps is established to provide a minimum pressure of 1.5kg/sq.cm at the farthest and highest sprinkler and 2.3 kg/sq.cm at the farthest spray nozzle.

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4) Jockey Pumps:

There will be independent Jockey Pumps for the hydrants system and for the sprinklers system. The head of the jockey pump would correspond to the head of main pumps for that system. The flow rate of each of these jockey pumps would be 189 LPM.

5) Main Fire Pumps Characteristics:-

The hydrants pumps as well as the sprinkler pumps provided are such that they should be able to deliver 150% of the rated flow at head not less than the 65% of the rated head. Also the shut off head should not be more than 120% of the rated head.

6) Air Vessels:-

One air vessel shall be provided in each system near the corresponding jockey pump. The air vessels would not only reduce the frequency of start/stop of jockey pumps but, by providing air cushion, would also reduce the intensity of water hammering.

7) Pressure Switches:-Pressure Switches shall be mounted on the air vessels for the automatic operation of the fire pumps. The pressure settings which are adjustable would be as under, assuming the working pressure of Hydrants System as ’p’ Kg/Sq.cum and that of the Sprinklers system as ‘q’ Kg/Sq.cm.

Hydrants System

Sprinkler System

Operating Pressure (Kg./Sq.cm.) p qJockey Pump Starts (Kg/Sqcm.) p-0.5 q-0.5Jockey Pump Stops (Kg/Sqcm) p q’Main Pump Starts (Kg./Sqcm) p-1.0 q-1.0Standby Pump Starts (Kg./Sqcm) p-1.5 q-1.5Main or Standby Pump Stops Manual ManualEach individual pump shall have its own pressure switch. All pressure settings are adjustable and can be set to suit the specific requirements.

NFPA-20

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8) No requirements of Diesel Engine Driven Standby Pumps:-

In view of the fact that two independent power supplies (from the utility supply co. as well as from the local D.G. sets and also the fact that the fire pumps would be connected to emergency supply circuit, diesel engine driven standby fire pump is not being provided.

9) Fire Brigade Connections

The following fire brigade connections are being provided to compliment/supplement the arrangements of Delhi Fire Service.

i) 4-Way inlet connection for the main fire water storage tanksii) Draw out connection for the main water storage tanks.

The FBC would to be located at place allowing easy access to Fire Tenders.

10) Fire Sprinklers System:-

a) The sprinklers system is designed as per NFPA-13. The hazard classification as already stated in para 4.6 above will be ordinary hazard group-I.

b) The pipe sizing is as per pipe schedule method in accordance with NFPA-13.

c) Sprinkler protection will be provided in the Refuge Store, First Aid Room, Stores (Stationery), Stores (Maintenance), Cleaners Rooms, Escalators in undercroft and at exits. The list of Rooms which are protected with Sprinklers is given in Annexure 4-1.

d) Open type sprinklers (spray nozzles) shall also be provided under the platform edge for under carriage protection

e) Each distinct sprinkler area shall have flow switch and flow switch test assembly. The flow switches indication shall have interface with the SCADA/BMS.

4.5.5 Fire Hydrants/First Aid Hose Reel System

a) Hydrants shall located near each escape staircases. Hydrants are also provided at platform level and concourse level at 60m intervals. These will be located in cabinets containing two hoses each 15m long and branch pipes for use by the Delhi Fire Service or trained staff on the DMRC. Each hydrant valve will be provided with a flow switch for giving indication on the fire alarm panel. (Hydrants shall also be provided in the tunnels – see para 4.5.5 below).

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b) First Aid Hose Reels would be 30.5m (100 ft.) long. These are being be located in such a way that all parts of the station, except the running tracks are covered. The Hose Reels would be fed directly from the Hydrants Mains.

4.5.6 Fire Protection in Tunnels

a) The underground tunnels shall be protected by Double Headed Hydrants. Upto the midpoint between 2 stations on both sides would be covered by the Fire Hydrants System of that station. These Hydrants would be provided at every 50 meters in each tunnel. This distance would be adjusted to locate these Hydrants close to any cross passages as far as possible.

b) The fire mains for the tunnels would be 150 NB (6”) in dia and would have isolating valve. This valve would be lockable and addressable.

4.5.7 Inert Gas Flooding System:

a) The inert gas flooding system is being provided to protect the Auxiliary Sub-Stations.

b) There would be 2 independent systems serving the rooms on the North side and the South side of the stations respectively.

c) The gas used would be Inert Gas Clean Extinguishing Agent (as defined in NFPA-2001), a mixture of various combinations of Nitrogen, Argon and CO2. These are all naturally occurring gases and have zero Ozone Depleting Effect.

d) The composition of this inert gas mixture and the design of the gas flooding system would comply with the requirements of NFPA-2001.

e) Each system would consist of an inert gas cylinder bank, the size of this bank would be determined by the volume of the Room it protects. The gas flooding operation would be automatic triggered by a signal from smoke detectors. The Inert Gas containers would be stored in a room adjacent to or near the Room to be protected.

f) The activation of any of detector in these rooms would give audio/visual alarm in the local control panel (in the gas bank room) and in the station Fire Alarm Panel. A manual releasing device will also be provided at the entrance of each of these protected rooms with an auto/manual selection panel for easy manual actuation of the gas flooding, should the need be there. There would be an ‘Abort’ switch also to bye-pass the automatic operation in case of a false alarm.

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g) Warning signs and alarms complying with NFPA-2001 shall also be provided at the entrance and inside each of these protected rooms.

h) The systems would be designed to provide a design concentration of the Clean Extinguishing Agent so as to reduce the Oxygen concentration to below 12.5% i.e. well below the combustion sustaining limit.

i) The Inert Gas Flooding System will be interlocked with the ECS serving each of these protected rooms, so that the supply, return and relief dampers, (if any) are closed prior to the release of the extinguishing gas.

4.5.8 Portable Fire Extinguishers

All the areas of the Station would also be protected with portable Fire Extinguishers in accordance with the requirements of NFPA-10. The type of extinguisher would be suitable for the use and the occupancy of the room/area. All the extinguishers would be ISI branded or UL/FM listed. The following types of Portable Fire Extinguishers would be provided :-

i) CO2 Gas Type (with non metallic horn) for Electrical Switchrooms and near Distribution Panel, with 4.5kg of Gas.

ii) Water, pressured by CO2 Gas Cartridge, 9 litres capacity.iii) ABC Powder Type, 5 kg capacity.

4.5.9 Interfacing of Automatic Systems with the Scada/BMS

All automation in the Fire Protection System shall have necessary interface with SCADA/BMS systems. (The SCADA/BMS systems would be supplied and installed by others and would be described elsewhere in the Report).

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4.6.0 Design Calculations:-

Design Calculations for sizing of various Equipments/Sub-Systems are given below:-

4.6.1 Calculations for determining the size of Fire Water Tank: (Common for both Hydrants and Sprinklers System)

Rate of Fire water supply required for Hydrants/stand pipes (as per NFPA-14; 500 usgpm for the hydraulically most remote standpipe and 250usgpm for the second standpipe (500+250= 750usgmp)

750usgpm = 2839lpm (A)

Rate of Fire water supply required for sprinkler system

2839 LPM (B)

As the U/G Stations are equipped with partial automatic sprinkler protection, hence as per para 5-9 1.3.2 of NFPA-14 the flow rate of both the system is to be arrived at by adding to the flow for Hydrants (A) and the flow rate of both the system is to be arrived at by adding to the flow for Hydrants (A) and the flow rate for sprinklers (B) or for ordinary hazard occupancy 500 usgpm (C), whichever is less. As (C) Is less than (B), the required flow rate for both the system

= (A)+(C)= 1250 usgpm= 4731.3lmp (D)

As (A)+(B) is more than (D), we adopt the value (A)+(B)As per chapter 9 of NFPA 14, para 9.2, the water supply for a class III system (hydrants) should be sufficient to provide demand for atleast 30 minutesi.e. 750 x 30 = 22500 U.S. Gallons (E)Further, the water supply duration of atleast 60 minutes is to be provided for the sprinkler/water spray systemi.e. 400x60= 24000 U.S. Gallons (D)Total minimum water supply required for Fire Fighting Systems

(D) +(E)= 46,500 U.S. Gallons= 1,76,002 lit.(say) 200,000lit.

Size of Fire Water Tank selected 200,000lit. i.e. 200cu.m(The tank would be in 2 halves for ease of periodic cleaning.)

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4.6.2 Calculations for Fire Fighting Pumps selection

Fire Water Pumps would consist of following pumps at each station.

1 Fire Hydrant Pumps (1 working + 1 standby)

2 Fire Sprinkler Pumps (1 working + 1 standby)

3 Jockey pumps for the Fire Hydrant and for the Sprinkler system

4.6.3 Fire Hydrant Pumps Capacity

Criteria -1

As per NFPA-14 the minimum flow rate for the hydraulically most remote stand pipe shall be 500 gpm(1893 l/min). The minimum flow rate for the second stand pipe shall be 250 gpm(946 l/min) per stand pipe.

As per layout drawings two stand pipes have been considered. Therefore as per above clause 1893 l/min shall be taken for the most remote stand pipe and 946 l/min for the additional stand pipe. Thus the capacity of fire hydrant pump = 1893 + 946 = 2839 l/min

Criteria-2

As per ODC Fire Pumps are required to deliver water at sufficient pressure to ensure a hydrant pressure as per NFPA 14 at the furthest hydrant with a flow of 2,400 l/min.

Comparing the above two criteria on the capacity of the Hydrant Pump is established at 2839 l/min

4.6.4 Fire Sprinkler Pumps capacity

The capacity of fire sprinkler pump shall be determined from the area density cuves of figure 5.2.3 in accordance with the method of 5-2.3.2 of NEPA. –13. (2007)

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The biggest consumption of sprinklers fire water is under the platform edge for the protection of rolling stock. No. of Medium Velocity Spray Nozzle = 72 (at intervals of 2.5 M for a platform length of 180 M.).

Area covered by Spray Nozzles = 2.5 M x 180M = 450 Sq.m = 4842sq.ft

Commodity classification as already established in the basis of design =ordinary hazard-1

From the density/area curves figure for the said commodity and assumed maximum area of operations (AMAO) of 4000 sq.ft. Same calculations would apply for all 9 underground stations of the CS-QM Corridor. The density would be 0.10 USGPM per Sq.ft i.e. maximum discharge =400x0.1=400usgpm =1514lpm.

So total required capacity = 1514lpm min. as per NFPA-13 (2007).

As all the 72 nozzles would operate simultaneously through a Motorised Valve the max. area of operation is to be assumed at 4842 sq.ft and so min. capacity of Sprinklers Pump required = 4842x0.1usgpm = 1832.7lpm.

However, to maintain symmetry with the Hydrants Pumps, Sprinklers Pumps of 2839lpm are selected. (Thus many spare parts would be inter-changeable.) Thus the capacity of the fire sprinkler pump selected is at 2839 l/min.

4.6.5 Jockey pump for Hydrant and Sprinkler system

Selection of capacity of jockey pump is based upon the required capacity of Hydrant and Sprinkler pumps

Hydrant pump capacity = 2839 l/min

Sprinkler pump capacity = 2839 l/min

The capacity of Jockey Pumps should be able to take care of minor leakages of the systems or min. 3%/max. 10% of the installed capacity of Main Pumps. We settle at an average figure of 6.5%.

for hydrant system = 2839 x 6.5% = 184.95 l/min

for sprinkler system = 2839 x 6.5% = 184.5 l/min

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We have chosen pump capacity of 189 l/min which is the nearest pump capacity as per table 2-20 of NFPA 20

Thus, capacity of the jockey pump for hydrant & sprinkler system is established at 189 l/min

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4.6.6 Selection of Fire Pumps delivery pipe line sizes

The delivery pipe line internal dia, calculated under different criterion and the height size arrived at is selected.

4.6.7 For fire hydrant pumps delivery pipe line

Criteria-1

As per table 2-20 of NFPA-20 The minimum size of discharge pipe for 2839 1/mm flow is 150 mm.

Criteria-2

As per ODC pipe size for fire main shall be 150 mm = 150 NB

Criteria-3

As per Table 5.7 of NFPA-14 (2007) for flow of 2839 lpm the minimum pipe size shall be 150 mm if the distance of piping from the farthest outlet is more than 100 ft. (30.5 m) .

Criteria-4

Velocity for of 2839 1/min (for a 150 NB (154.4 mm I.D.) Pipe.

= 2839x4 = 2.53 m/Sec 1000x60xx(0.154)2

Which is acceptable (as per TAC Guidelines being between 2.5 to 3.0 m/sec.)

Hence pipe diameter for Hydrant pump delivery lines of 150 NB isselected.

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4.6.8 For fire sprinkler Pumps delivery pipe line

The diameter is selected on the following basis

Criteria-1

Pipe schedule procedure as suggested in NFPA-13 (2007) clause 6.5.3.2 and Table 6.5.3.2a. As per this reference for more than 100 sprinklers required pipe diameter = 125 NB.

Criteria-2As per table 2-20 of NFPA 20 the minimum size of discharge pipe for 2839 1/min flow is 150 NB.

Criteria-3

Same as in the case of criteria – 4 of 4.6.7

Hence selected pipe diameter for Hydrant Pump delivery/main line is 150 NB

4.6.9 Calculations for Pumps Head selection

a) Fire Hydrant Pumps

As per clause 5.7 of NFPA 14 stand pipe system shall be designed to provide the required water flow rate at a minimum residual pressure of 6.9 bars at the outlet of the hydraulically most remote 63.5 mm hose connection

As per the layout drawings the hydraulically most remote hose connection is of double headed landing valve located in tunnel. Maximum flow of 2 Hydrants Valves operated simultaneously =2x250usgpm= 1,892 lpm.

Pipe diameter as already established = 150 mm NB

From Hazen William's chart it can be found that 150 NB dia pipe (I.D. 154.4 mm) would convey 1892 l/min flow with a head loss of 2.10 m per 100 m run.

Total developed straight length between pump room and double headed landing valve and the equivalent pipe length of valves and fittings as per table

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5-10.1 of NFPA 14 are shown in the adjoining table. The equivalent lengths of various pipe fittings are drawn from NFPA-13, as under:-

Fittings and valves Equivalent lengthElbow 90 026 nos110.76

14’ = 4.26m

Elbow 45 0 7’ = 2.13m

Tee 30’ = 9.14mButterfly valve 10’ = 3.04mCheck valve 32’ = 9.75m

Total equivalent length of pipeline and the frictional head loss are shown below:

Station: Hauz Khas

Eq. pipe length of valves & fittings of 150 mm dia as per table 8.3.1.3 of NFPA 14

Fittings and Valves Quantity E.length Total Length

Elbow 90 degree26 nos110.76

24 Nos. 4.26 102.24

Tee 2 Nos. 9.14 18.28

Butterfly valve 2 Nos. 3.04 6.08

Check valve 1 9.75 9.75Equivalent length of fittings and Valves = 136.35

Total developed straight length between pump room and double headed landing valve = 405 m (upto north end of station) + 650 m ( towards Green Park inside the tunnel) = 1055 m

Total equivalent length of pipe line = 1055 + 136.35 = 1191.35 m

Frictional head loss = 1191.35 x 2.10 100 = 25.01 m

Gravity Head gain = 19.25 m

Net head required = 69 + 25.01 - 19.25 = 74.76 m.

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Thus the selected head for fire hydrant pump is established as 75m.

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b) SPRINKLER PUMPS

The discharge pressure of pump is selected as 56m, as under

The hydraulically most remote Sprinkler is the farthest Spray Nozzle under the Platform edge.

It has already been established that rated flow of the Sprinklers Pumps which also feed the Spray Nozzles (through a motorized valve) = 2839 lpm.

To utilize full capacity of Sprinklers Pump the target Discharge from the farthest spray nozzle = 2839 = 39.43lpm

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For uniform distribution of flow from theses Medium Velocity Spray Nozzle, Nozzles of minimum orifice dia (6.0 mm) having K factor of 26 are selected. Thus pressure required at the base of the farthest spray nozzle

(Q/K)2 = ( 39.43/26) 2 = 2.3 bar = 23.0 m of water column.

Station : Hauz Khas

Equivalent pipe length of valves and fittings of 150 mm dia.

Fittings and Valves Quantity E.length Total Length

Elbow 90 degree26 nos110.76

17 Nos. 4.26 72.42

Tee 2 Nos. 9.14 18.28

Butterfly valve 2 Nos. 3.04 6.08

Check valve 1 9.75 9.75Equivalent length of fittings and Valves = 106.53

Total developed straight length between pump room and Motorized Butterfly valve = 120 m

Total equivalent length of pipe line = 120 + 106.53 = 226.53 m

From Hazon Williams chart it can be found that frictional head loss in 150NB (I.D. 154.4mm) while conveying a flow of 2839 lpm is 3.57 m per 100m,

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So Frictional head loss in pipe line ( upto Motorized Valve)

= 226.53 x 3.57 100 = 8.08 m Friction Head loss from Motorized valve to the farthest sprinkler

= 11 m (See Para 4.6.10 )Min. Head required at the farthest sprinkler = 23 m

Gravity Head gain = 18.45 m

Minimum head to be developed by Sprinkler pump = 23 + 8.08 + 11 – 18.45

= 20.63 m. To maintain uniformity and interchangeability; Head of 56m, which is also a popular size as per TAC, is to be preferred, however, Orifice Plate of suitable bore are to be provided at various levels/ branches to reduce the pressure to desired levels and also for better pressure balancing.

Selected Pump Head for Sprinklers Pumps = 56 m

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4.6.10 Calculation for Head Loss in Nozzle Spray pipe under platform.

Points

(See fig.-1 in

Annexure -4-2)

Max. Flow (in USGPM)

Dia. of pipe in mm

Frictional Head Loss in MWC per 100 m of pipe

Total length of pipe for specified flow

Frictional Head Loss for specified length of pipe( in MWC)

1 2 3 4 5 6

Upto 12 10.41*6= 62.46 80 1.08 15 0.16Upto 11 10.41*12= 124.92 80 3.89 15 0.58Upto 10 10.41*18= 187.38 80 8.27 15 1.24Upto 9 10.41*24= 249.90 100 3.47 15 0.52Upto 8 10.41*30= 312.30 100 5.20 15 0.78Upto 7 10.41*36= 374.76 100 7.4 15 1.11Upto 6 10.41*42= 437.22 150 1.31 15 0.20Upto 5 10.41*48= 499.68 150 1.66 15 0.25Upto 4 10.41*54= 562.14 150 2.10 15 0.31Upto 3 10.41*60= 624.60 150 2.52 15 0.38Upto 2 10.41*66= 687.06 150 2.90 15 0.43Upto 1 from Orifice Plate (after Motorized Valve)

10.41*72= 750.00 150 3.57 24 (approx.)

0.85 + 4.0 m (appro. losses in pipe fittings and others

Total 10.81(Say) 11 mwc

Minimum Head required in MWC at the farthest Spray nozzle (point -13) = 23

Therefore, Design Head just after Orifice Plate = 11 + 23 = 34 MWC

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4.7 Annexure - 4.1

Summary of Fire Protection Systems provided

Room /Area Reference No.

DescriptionHydrants/ Hose Reels

Sprinklers

Multi-Sensor Smoke

Detectors

Inert Gas

Flooding

Portable Fire Extinguisher

s

Public Areas

U01 Station Entrance & Passageways

Yes Yes Yes

U02 Concourse Public Area Yes Yes YesU03 Station Control Room Yes Yes

Platform Public Area Yes YesStaff/ Operation Rooms

U04 Station Manager Room Yes Yes * U05N Ticket Office (TOM) Yes Yes U05S Ticket Office (TOM) Yes Yes

U06NCash & Ticket Supervision Yes Yes *

U06SCash & Ticket Supervision Yes Yes *

U07 Customer Care (EFO) Yes Yes * U08 First Aid Yes Yes Yes * U09 Security/Police Room Yes Yes *

U10N Store (Stationary etc) Yes Yes Yes * U10S Store (Stationary etc) Yes Yes Yes *

U11Store(Maintenance Equipment) Yes Yes Yes *

U12 Cleaners Room Yes Yes Yes * U13 Refuse Room Yes Yes Yes *

U14N Staff Locker Room Yes Yes * U14S Staff Locker Room Yes Yes * U16N Staff Mess Room Yes Yes * U16S Staff Mess Room Yes Yes * U18N DB Room Yes Yes * U18S DB Room Yes Yes * U19 ECS Plant Room Yes Yes Yes

U20N TVF Room Yes Yes U20S TVF Room Yes Yes

U22Signalling Equipment Room Yes Yes

U23 Telecom Equipment Yes Yes

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RoomU24 S & T Room Yes Yes

U25NAuxillary Sub Station Room Yes Yes Yes

U25SAuxillary Sub Station Room Yes Yes Yes

U26NStation UPS/ Battery Room Yes Yes *

U26SStation UPS/ Battery Room Yes Yes *

U27 Inert Gas Room Yes Yes * U28 CDMA Room Yes Yes * U29 GSM Room Yes Yes *

U31N Sewage Ejector Room Yes Yes * U31S Sewage Ejector Room Yes Yes * U32N Sump Pump Room Yes Yes * U32S Sump Pump Room Yes Yes * U43 Fire Water Pump Room Yes Yes * U45 Diesel Generator Room Yes Yes Yes U48 Chiller & VAC Room Yes Yes Yes U50 TR & HT Panel Room Yes Yes

U51Emergency Equipment Room Yes Yes *

* Covered by common Fire Extinguishers located outside a group of rooms.

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design report (hk)

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