fire fighting

Table of Content 1

1. Purpose 2

2. Design Basis & Assumption 2

3. Reference 3

4. Attachment 3

5. Computation 4

6. Result & Conclusion 11

Sheet REV1

PP7 EXTENSION 3 PROJECT

CALCULATION- FIRE FIGHTING SYSTEM & PIPE LINE SIZING

TABLE OF CONTENTS

SAR687-XW01-OOSG-B22100 CPP7 Extension 3 Project - Units 23 & 24CALCULATION - FIRE FIGHTING SYSTEM AND

PIPE LINE SIZING

1 PURPOSE

1.1 To work out the quantity of maximum fire water demand 1.2 To work out the main fire water header size based on maximum fire water demand1.3 To work out the minimum fire water pressure at Owner / Contractor tie in interface point

1.4

1.5

1.6

1.7

1.8 To work out various line sizes and deluge valve sizes

1.9 To work out the HP CO2 flooding quantity for the electrical switchgear room

2 DESIGN BASIS & ASSUMPTION

2.4

2.5

2.6

2.7

Sheet REV2

To work out the water requirement for Fuel Oil Pump Skid of each GT ( supplied by Siemens under ECONOPAC)

To work out the water requirement for Lube Oil Cooler & Tank of each GT ( supplied by Siemens under ECONOPAC)

To work out the water requirement for the 2000 KVA LV Transformer (00UBD).

Maximum fire water demand in the event of single largest fire in the plant has been considered as fire at GSU transformer (00UBF), which is the single largest fire hazard of the plant. Therefore the same is considered for computation of maximum fire water demand of the plant

For calculation of water requirement for deluge system in transformers, Dimensions of GSU transformer (00UBF) as offered by Hyundai bid has been considered.(Refer Attachment - 4.1)

In absence of detail piping layout, pipe length has been presently estimated from overall plant layout. A margin of 50% over the actual estimated straight length of pipe has been considerd to take care of fitting and approximation in estimated length. (Refer Attachent 4.5)

Per NFPA-14 item 7.8.1.1 (Ed 2003), minimum residual pressure of 100 psi (6.9 bar (a)/ 5.9 bar (g))at the outlet of hydraulically most remote 65mm hose connection has been considered to work out the minimum fire water pressure required at the Contractor / Owner tie in terminal point . (Refer Attachment 4.4)

Per NFPA-15, item 8.5.1.1 (Ed 2001) Hazen and William Formula has been used to work out the pressure drop in fire water line ( Refer attachment 4.2)

For sizing of main header pipe, a water velocity of 2.0 m/sec and for branch pipe 3.0 m/sec has been considered.

Per NFPA-15, item no 7.4.4.3.1 (ED. 2001) a fire water spray density of 10.2 lit/min/m2 (0.25 gpm/ft2) of projected area of rectangular prism enevelope for the transformer and its appurtenances has been considered for working out the design flow rate for fire water demand for tansformer under fire condition ( Refer attachment 4.3)

For calculation of water requirement for deluge system in aux. transformers, Dimensions of Aux. transformer (23 UBE and 24 UBE) as offered by Areva bid has been considered.(Refer Attachment - 4.6)

Per NFPA-15 item 8.1.2 (Ed 2001), minimum operating pressure for any nozzle of sprinkler system for out door hazard shall be 1.4bar (20psi). Therefore a pressure of 2.0 bar(a)/ 1.0 bar (g) has been considered in the calculation as a nozzle operating pressure.. (Refer Attachment 4.3)

Per NFPA -14, Item 7.10.1.1.1, a flow of 500 gpm ( 1890 lpm) has been considered as fire water demand for each hydrant ( 2 nos of 65mm hose connection) (Refer Attachment 4.4)

Per NFPA-15, item no 7.4.4.3.2 (ED. 2001) fire water shall be applied at a net rate of 6.1 lit/min/m2 (0.15 gpm/ft2) on the expected non-absorbing ground surface area of exposure( Refer attachment 4.3).

To work out the water requirement for GSU Transformer (00UBF) and Aux. Transformers ( 23 UBE & 24 UBE)

C

As per SEC ITB spec cl. No. 1.3.17.3, the fire fighting system for the extension plant shall be interfaced with the existing plant fire fighting system. Therefore the fire water required for PP7 Ext-III project would be drawn from the existing fire water network.

Maximum of the two values worked out i.e based on the pressure loss in the deluge system network or the pressure at the outlet of hydraulically most remote 65mm hose connection, has been considered to select the minimum fire water pressure required at the Contractor / Owner tie in terminal point.

2.13

2.12

PP7 Extension 3 Project - Units 23 & 24 SAR687-XW01-OOSG-B22100CALCULATION - FIRE FIGHTING SYSTEM AND

PIPE LINE SIZING

2.3

2.2

2.1

2.11

2.10

2.9

2.8

2.15

2.16

2.17

2.18

3. Reference

3.1

3.2 Flow diagram- Fire Fighting System (Doc No : SAR687-UC07-OOUZ-B21650, Rev-1)3.3 Hyundai vendor drawing for GSU / Power Transformer GA and Oil volume.3.4 NFPA - 153.5 NFPA-143.6 General layout (Doc No : SAR687-UC07-OOUZ-010001, Rev.C)3.7 Plant layout (Doc No : SAR687-UC07-OOUZ-010002, Rev.C)3.8 Layout Plan & Sections- Electrical Building (Doc No : SAR687-YD00-OOBB-B32300)3.9 Areva vendor dwg for Aux. Transformers GA 3.1 NFPA-12

4. Attachment

4.1 Hyundai vendor dwg for GSU / Power Transformer GA and Oil volume (1 page)4.2 Extract of NFPA-15, item 8.5.1.1 (Ed 2001) Hazen and William Formula ( 1 page)4.3 Extract of NFPA-15 (Ed 2001), item no 7.4.4.3.1 and 8.1.2 (1 page)4.4 Extract of NFPA-14(Ed 2003) item 7.8.1.1 and 7.10.1.1.1 (1 page)4.5 Estimated pipe length of fire water pipes (1 page)4.6 Areva dwg for Aux. Transformers GA (1 page)4.7 CO2 requirement for Deep-seated fire - Extract of NFPA-12 (Ed 2000), Table 2.4.2.1 (1 page)4.8 Extract of NFPA-15 (Ed 2001), item no 7.3.2, (1 page)4.9 Fuel oil pump skid (ECONOPAC) dimensions (1 Page)

4.10 Lube Oil Cooler dimensions received from TME vide Siemens dwg. No. 2262J90 , R-34.11 ABB Vender dwg. for 2000 KVA LV Transformer (1 Page)

5. Computation

5.1 Water requirement for Spray Deluge system for largest GSU Transformer (00UBF) Ref 2.2

5.1.1 Transformer Dimensions: Ref 4.1a) Length L m 9.50b) Width W m 6.40c) Height H m 6.90

5.1.2

5.1.2a A2 m2 60.80

Sheet REV3

Per NFPA -15, Item 7.3.2, for calculating the water requirement for fire fighting of fuel oil pumps, lube oil coolers etc. a water spray rate of 20.4 lpm/ m2 of projected surface area of equipment has been considered.(Refer Attachment 4.8)

CPP7 Extension 3 Project - Units 23 & 24

Electrical switchgear room shall be designed for HP CO2 total flooding system (Ref 3.1) considering deep-seated fires involving solids. (For floding factors refer Attachment- 4.7)

280.22

For calculating the water requirement for fire fighting of lube oil coolers, the sizes are estimated based on the sketch attached at Attachment 4.10

CALCULATION - FIRE FIGHTING SYSTEM AND PIPE LINE SIZING

A1 m2Total Projected Surface Area except bottom surface (A1=LxW + (LxH + WxH)x2)

Electrical switchgear room shall have AC duct opening at the walls which will be closed by fire damper at the time of fire extinguishment. No other ventilation opening have been provided. Therefore, no compensation for loss of CO2 quantity for leakage/ ventilation opening shall be considered.

2.14

Design Criteria prepared by Siemens for PP7- Fire Protection Alarm & Gas detection - Siemens Letter no# 0086 dated 29 July 04.

For calculating the water requirement for fire fighting of Econopac fuel oil pumps the size of the skid is estimated based on the sketch attached at Attachment 4.9.

SAR687-XW01-OOSG-B22100

Total bottom non absorbing ground surface of transformer (A2=LxW)

5.1.3 Q1 lpm/m2 10.20 Ref 2.5

5.1.3a Q2 lpm/m2 6.10 Ref 2.6

5.1.4 QA lpm 3229.12

5.1.5 QB lpm 1890.00

5.1.6 Qc lpm 5119.12

5.1.7 Qc lpm 5119.00

GPM 1352.005.1.8

Ref.4.6a L m 3.75b W m 3.05c H m 3.30d A1 m2 56.32

e A2 m2 11.44

f Q1 lpm/m2 10.20 Ref 2.5

g Q2 lpm/m2 6.10 Ref 2.6

h QA lpm 644.21

~Say lpm 645.00

5.1.9 Ref.: 4.10

a L m 6.67b W m 3.72c H m 2.50d A m2 76.79

e q lpm/m2 20.40 Ref 2.16 & 4.8f Q lpm 1566.61

~say lpm 1567.0

5.1.10 Ref.: 4.9

a L m 3.62b W m 3.40c H m 2.30d A m2 44.60

Sheet REV4

Height

Total Projected Surface Area except bottom surface (A=LxW + (LxH + WxH)x2)

Total water requirement for Spray deluge system for largest transformer (QA=(Q1*A1)+(Q2*A2))

Water spray density for bottom non absorbing ground surface

Total Projected Surface Area except bottom surface (A=LxW + (LxH + WxH)x2)

Water spray density -for projected

HeightWidth

Total water requirement for econopac

Water Requirement for Econopac Fuel Oil Pump Skids

Width

Transformer Dimensions: Length

Total maximum water requirement (5.1.6 above)

Total water requirement for Spray system + hose stream water requirement for largest transformer (QC =QA+QB)

Height

Water spray density for bottom non absorbing ground surface

Total water requirement for Aux. transformer (QA=(Q1*A1)+(Q2*A2))

Water spray density -for projected surface except bottom surface

Total Projected Surface Area except bottom surface (A1=LxW + (LxH + WxH)x2)

Total bottom non absorbing ground surface of transformer (A2=LxW)

PP7 Extension 3 Project - Units 23 & 24

Water Requirement for Aux. Transformers ( 23 UBE & 24 UBE)

Additional Hose Stream water requirement for transformer


Water Requirement for Econopac fin fan lube oil coolers:



WidthLength

C

Length

e q lpm/m2 20.40 Ref 2.16 & 4.8

f Q lpm 909.84

~say lpm 910.0

5.1.11Ref.4.11

a L m 2.00b W m 2.25c H m 2.20d A1 m2 23.20

e A2 m2 4.50

f Q1 lpm/m2 10.20 Ref 2.5

g Q2 lpm/m2 6.10 Ref 2.6

h QA lpm 264.09

~Say lpm 265.005.2 Calculation for main fire Header Pipe diameter:

5.2.1 V m/ sec 2.00 Ref.: 2.11

5.2.1.a Qc lpm 5119.00 Ref.: 5.1.7

5.2.3 D mm 250

5.2.4 OD mm 273

5.2.5 t mm 9.27

5.2.6 ID mm 254.5

5.2.7 V m/sec 1.68 i.e < 2.0 m/sec

5.2.8 D mm 250

5.2.9 Calculation for Diameter of the branch Pipe for GSU transformers (00UBF):a V m/ sec 3.00 Ref.: 2.11

b Q lpm 3229.12 ref:5.1.4c D mm 151.1

d D mm 150

e ID mm 154.08

f 2.89 i.e < 3.0 m/sec & hence okay

g D mm 150

Sheet REV5

Water spray density for bottom non absorbing ground surfaceTotal water requirement for 2000 KVA LV Transformer (QA=(Q1*A1)+(Q2*A2))

Calculated Diameter of the Header pipe D=(SQ RT of ((Qc/1000) *(1/60)*4/ (3.14*V))*1000)

Outer Diameter of selected pipe as per Schedule 40

Standard Diameter selected (Next heigher standard size)

Thickness of the pipe as per Schedule 40

Calculated velocity of the pipe for checking

Inner Diameter of the pipe as per sch-40Calculated velocity of the pipe for checking

Max. flow through pipeCalculated Diameter of the Header pipe (D=SQ RT of ((Qc/1000) *(1/60)*4/ (3.14*V))*1000)

Inner Diameter of the pipe ( ID= OD-2xt)

Selected pipe size

PP7 Extension 3 Project - Units 23 & 24CALCULATION - FIRE FIGHTING SYSTEM AND

PIPE LINE SIZING

Velocity of water in the pipe header

5.2.2




Max.flow through pipe (for largest water demand)

Selected header size

Total water requirement for Econopac Fuel Oil Pump Skids (Q=(q*A))

Water Requirement for 2000 KVA LV Transformer (00UBD)Transformer Dimensions: LengthWidthHeightTotal Projected Surface Area except bottom surface (A1=LxW + (LxH + WxH)x2)Total bottom non absorbing ground surface of transformer (A2=LxW)

D

SAR687-XW01-OOSG-B22100 C

mm 233.05


5.2.10 Calculation for Diameter of the branch Pipe & Deluge valve for Aux. Transformers (23 UBE& 24 UBE):

a V m/ sec 3.00

b Q lpm 644.21 Ref.: 5.1.8-hc D mm 67.50

d D mm 65

e ID mm 67.25

f 3.02 i.e ~ 3.0 m/sec & hence okay

g mm 65

5.2.11 Calculation for Diameter of the branch Pipe & Deluge valve for lube oil cooler:a V m/ sec 3.00b Q lpm 1567.00 Ref.: 5.1.9 -fc D mm 105.28

d D mm 100

e ID mm 105.30

f 3.00 i.e ~ 3.0 m/sec & hence okay

g mm 100

5.2.12 Calculation for Diameter of the branch Pipe & Deluge valve for Econopac Fuel Oil Pump Skid:

a V m/ sec 3.00

b Q lpm 910.00 Ref.: 5.1.10 -f

c D mm 80.23

d D mm 80

e ID mm 81.9


g mm 80

5.2.13 Calculation for Diameter of the branch Pipe & Deluge valve for 2000 KVA LV Transformer(00UBD):a V m/ sec 3.00b Q lpm 265.00 Ref.: 5.1.11 -h

c D mm 43.30

d D mm 50

e ID mm 51f 2.16 i.e < 3.0 m/sec & hence okayg mm 50 (2")

Sheet REV

6

Selected pipe size & Deluge valve size

Max. flow through pipe

Calculated Diameter of the Header pipe (D=SQ RT of ((Q/1000) *(1/60)*4/ (3.14*V))*1000)

Calculated Diameter of the Header pipe D=(SQ RT of ((Q/1000) *(1/60)*4/ Standard Diameter selected (Next heigher standard size)

Standard Diameter selected (Next heigher standard size)Inner Diameter of the pipe as per sch-40

Calculated Diameter of the Header pipe D=(SQ RT of ((Q/1000) *(1/60)*4/ (3.14*V))*1000)






PP7 Extension 3 Project - Units 23 & 24




Calculated Diameter of the Header pipe D=(SQ RT of ((Qc/1000) *(1/60)*4/ (3.14*V))*1000)




Inner Diameter of the pipe as per sch-40

Calculated velocity of the pipe for

CSAR687-XW01-OOSG-B22100

Velocity of water in the pipe headerMax. flow through pipe

Inner Diameter of the pipe as per sch-





5.2.14 Ref.: 3.2 & 4.5

a V m/ sec 3.00b Q lpm 2477.00 Ref.: 5.1.10-f &

5.1.9-f

c D mm 132.37

d D mm 150

e ID mm 154.08


g mm 150

5.3 Ref.:2.135.3.1 Qc lpm 5119.0 Ref.: 5.1.7

5.3.2 D mm 250.0 Ref.: 5.2.85.3.3 ID mm 254.46 Ref.: 5.2.65.3.4 C 120.05.3.5 Pm bar/m

Ref.: 4.2

Pm =

Qc = Flow in L/min

C = Pipe friction loss co-efficient

ID = actual internal dia of pipe in mm.

Pm bar/m 0.00121

5.3.6 Lt m 315 ref.: 4.5

5.3.7 Pt bar 0.38

5.3.8 Total loss of pressure in the transformer ring:

a) QA lpm 3229.12 ref.: 5.1.4b) N No. 40

c) Q2 lpm 80.73

d) Q3 lpm 1654.9

e) Dt mm 100

f) IDt mm 102.30

g) C 120

Sheet REV7

Pressure Available/ Required at the Tie- in Point:

Where

Max. flow through pipe ( Flow for both lube oil cooler + fuel oil pump skid )

Calculated Diameter of the Header pipe (D=SQ RT of ((Q/1000) *(1/60)*4/ (3.14*V))*1000)Standard Diameter selected (Next heigher standard size)

Min. flow through transformer ring = flow through each nozzle

Max. Flow rate in relocated header pipe


CPP7 Extension 3 Project - Units 23 & 24CALCULATION - FIRE FIGHTING SYSTEM AND

PIPE LINE SIZING

frictional resiatance in bar/meter length of pipe


Pm=6.05x10^5x Qc^1.85/ (C^1.85x ID^4.87)

No. of Nozzles ( assumed for estimation purpose)

Internal Dia of transformer ring header pipePipe friction loss co-efficient

Average flow in transformer ring (Q3=(5.3.8a+5.3.8c)/2)Transformer ring header size (assumed, to be confirmed by the Fire protection vendor later)

Selected fire header sizeInternal Dia of pipe Pipe friction loss co-efficientFriction loss based on Hazen-Williams formula,

Therefore, Friction loss based on Hazen-Williams formula as aboveTotal Equivalent Length of pipe & fittingsTotal loss of pressure in main pipe & fittings (Pt= Pm x Lt)

Max. flow in the transformer ring


Selected pipe size

Calculation for Diameter of the common branch Pipe for Fuel Oil Pump Skid & Lube oil Cooler: (node 1' to 2' in attachment 4.5)


h) Pm bar/m 0.013

i) Lt m 42.00

j) P1 bar 0.53

k) P2 bar(g) 1.00 Ref.: 2.9

l) bar(g) 1.53

5.3.9 P bar(g) 1.91

5.3.10 P bar(g) 1.91

5.3.11

a) bar(g) 5.9 Ref.:2.8

b) bar(g) 0.38 Ref 5.3.7

5.3.12 bar(g) 6.28

5.3.13 bar(g) 6.28

5.3.14 bar(g) 6.28

5.4 CO2 requirement (Total Floding system) for Electrical Switchgear Room (00UBA):5.4.1 Design Requirements:

a) Class of Fire Cb) Type of combustible Dry electrical Hazardsc) Type of fire Deep- seated Ref.2.14d) Type of protection HP CO2 (Total Flooding) Ref.2.14e) Minimum Design Temperature ° F ( º C) 70 (21)f) Maximum Design Temperature ° F ( º C) 130 (54)g) System Working Pressure PSI (MPA) 850 ( 5.86 )h) Design Concentration % 50.0 Ref 4.7i) Flooding Factor (Volume Factor) lb CO2/ ft

3 0.083 Ref 4.7

5.4.2 Building Dimensions Inclussive of Battery Room: Ref. 3.8a) Length L1 m 20.60b) Width W1 m 9.40c) Height H1 m 3.60d) V1 m3 697.10

5.4.3 Battery Room Dimension: Ref. 3.8

a) Length L2 m 7.50

b) Width W2 m 4.20

c) Height H2 m 3.60d) V2 m3 113.4

5.4.4 V m3 583.7

i.e V ft3 20612.95.4.5 V ft3 20613.0

Sheet REV8

Volume

Total Volume to be Protected by CO2

Net volume of Electrical Switchgear Room (00UBA) excluding Battery room volume (V= V1-V2)

Volume

Friction loss based on Hazen-Williams formula as in 5.3.5 above

Total pressure loss in the transformer ring header including nozzle pressure= ( 5.3.8j+5.3.8k)

Total min. pressure required at the tie- in point, based on duluge spray system losses (item 5.3.9 above)Based on Standpipe & Hose system pressure requirement:

Total min. pressure required at the tie- in point, due to losses (P=5.3.7+5.3.8l)

Total pressure loss in the transformer ring header (P1= 5.3.8hx5.3.8i)

Total length of transformer ring from deluge valve (Estimated length based on the length & width of transformer)

Operating pressure required at any nozzle

Total loss of pressure in main pipe & fittings Total pressure required at tie-in point based on Standpipe & Hose system pressure requirement ( item 5.3.11-a

Minimum residual pressure required at the outlet of hydraulically most remote 65-mm hose connection

Pressure required at tie-in point, I.e. Max. of 5.3.10 & 5.3.12Pressure required at tie-in point (5.3.13 above)

PP7 Extension 3 Project - Units 23 & 24 SAR687-XW01-OOSG-B22100 CCALCULATION - FIRE FIGHTING SYSTEM AND

PIPE LINE SIZING

5.4.6a) Q1 lb CO2 1710.9

b) Q2 lb CO2 0.00 Ref. 2.15

c) Q lb CO2 1710.88

~say lb CO2 1711.005.4.7

a) lbs 100b) Nos. 24.44

~say Nos. 25

c lbs 68.44

6.0 RESULT & CONCLUSION

6.1 Maximum fire water demand = 5119.0 lpm Ref: 5.1.7

6.2 Selected header pipe size = 250 mm Ref.: 5.2.8

6.3 Min. pressure required at tie-in point = 6.28 bar(g) Ref:5.3.146.4 Water Demand for other equipments under deluge system:

a) Water requirement for GSU Transformer (00UBF) = 3229 lpm Ref 5.1.4b) = 645 lpm Ref 5.1.8 h

c) Water Requirement for lube oil coolers = 1567 lpm Ref 5.1.9- fd) Water Requirement for Fuel Oil Pump Skids = 910 lpm Ref 5.1.10- fe) = 265 lpm Ref 5.1.11- h

6.5 Line Size & Deluge valve sizes:

Flow (lpm) Line size (mm)

Ref.: Flow/ Dia

a) 3229 150 150 Ref.: 6.4-a/ 5.2.9-g

b) 645 65 65 Ref.: 6.4-b/ 5.2.10-g

c) 1567 100 100 Ref.: 6.4-c/ 5.2.11-g

d) 910 80 80 Ref.: 6.4-d/ 5.2.12-g

e) 265 50 N/A Ref.: 6.4-e/ 5.2.13-g

f) 2477 150 N/A Ref.: 5.2.14-b / 5.2.14- g

6.6 Total Quantity of CO2 required = 1711 lb CO2 Ref.:5.4.6-c

Note (*): The deluge valve size are indicative only. Actual size to be confirmed by the vendor.

Sheet REV9

Deluge valve size (mm)- see note

Water requirement for Aux. Transformers ( 23 UBE & 24 UBE)

Quantity of CO2 in each cylinder

Basic Quantity CO2 for total flooding (5.4.1-i) x (5.4.5)

Total Quantity of CO2 required (5.4.6-a + 5.4.6.-b)

Water Requirement for 2000 KVA LA Transformer (00UBD)

Standard size of cylinder proposed

for 2000 KVA LV Transformer (00UBD)

Cylinder Selected:

PP7 Extension 3 Project - Units 23 & 24 SAR687-XW01-OOSG-B22100CALCULATION - FIRE FIGHTING SYSTEM AND

PIPE LINE SIZING

C

Common branch pipe for Fuel Oil Pump Skid & Lube oil Cooler

Equipment/ System

For GSU transformer

For Aux. Transformers

For Lube Oil Cooler

for Fuel Oil Pump Skids

Quantity of CO2 required for compensation for Ventilation Opening:

Quantity CO2 for total flooding :

Remark: 25 x 100 lbs cylinder are being proposed. However, Supplier to comply with maximum fill density of the storage containers in accordance with NFPA.

Quantity of cylinders required (considering 70% effective liquid discharge for fire extinguishment)

Remark: 25 x 100 lbs cylinder are being proposed. However, Supplier to comply with maximum fill density of the storage containers in accordance with NFPA

fire fighting

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