HYDRAULIC CALCULATION FOR FOAM SYSTEM-WFF
5. As per NFPA 11, Clause no 10.7.3 Pressure restriction orifice are provided for the following
tank bund protection in order to reduce the pressure.
S.no
Provided
Foam
system
Protected Equipment / Area
Pressure
drop (Bar)
Orifice
diameter
(mm)
1
Jet A-1 Storage Tank T201 Bund
1.8
161
2
Jet A-1 Storage Tank T202 Bund
1.0
181
3
Jet A-1 Storage Tank T203 Bund
1.3
173
4
Jet A-1 Storage Tank T204 Bund
0.6
194
5
Jet A-1 Storage Tank T205 Bund
1.3
170
6
Cross field pumps Bund
5.0
66
7
Refullers
3.0
50
8
WTAP Hydrant pumps
4.0
67
9
Test rig & fullers bay
2.8
73
10
Defuller
5.8
23
Bund
Protection
6. As per the outcome of hydraulic calculation results the worst-case foam solution demand is
17914 Lpm (1075 m3/hr) for Jet A-1 Storage Tank T203 Bund fire and Foam Concentrate
demand is 32.25 m3/hr (1075 X 0.03 = 32.25). Hence, the proposed foam concentrate pump
capacity of 33 m3/hr is sufficient to cater the foam concentrate demand.
7. As per the outcome of hydraulic calculation results the worst-case foam solution demand is
17914 Lpm (1075 m3/hr) for Jet A-1 Storage Tank T203 Bund fire and the required foam
concentrate for 30 minutes operation is 16.12 m3. Hence, the proposed foam concentrate tank
capacity of 20 m3/hr is sufficient to cater foam concentrate demand.
DOC. NO.: AC001-D6000-17-U0C-U-XXX0005
Rev 01
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