FIRE WATER DEMAND CALCULATION FOR HYDROCARBON
STORAGE TANKS.
Fire water demand is calculated based on NFPA-11 and local regulation. for more details
on step by step calculation read this article.
Chemistry
Below calculator does not provide complete calculation but is made to facilitate the user
in performing FW demand calculation.
READ THE DETAILED GUIDE.
Fire Water and Water for Foam
Generation
Fire Water and Foam Demand Calculator
ed in IOCL, BPCL, ONGC, OIL, SAIL, Berger & others
Main Tank on Fire (TK-A)
Diameter of Tank (feet):
Enter diameter...
Tank Height (feet):
Enter height...
Water Application Rate (gpm/ft²):
0.2
Percentage of Tank Surface Exposed to Fire (%):
Enter percentage...
Calculate Fire Water Demand
Tank Surface Area (TSA): 2228.66 sq. feet
Surface Area Exposed to Fire: 1114.33 sq. feet
Required Water Demand: 222.87 gpm
Cooling of Adjacent Tank (TK-B)
Diameter of Adjacent Tank (feet):
Enter diameter...
Height of Adjacent Tank (feet):
Enter height...
Water Application Rate (gpm/ft²):
Enter application rate...
Calculate Cooling Demand
Foam/Water Demand Calculator
Diameter of Tank (feet):
Enter diameter...
Open
Rim Seal Width (feet):
Enter rim seal width...
Foam/Water Application Rate (gpm/ft²):
Enter application rate...
Number of Supplementary Hose:
Enter number of supplementary hose...
Calculate Foam/Water Demand
Total FW Required (combination of above calculations)
MAIN FW PUMP FLOW RATE
Minimum Required Flow Rate A5 = C + i + j = 222.87 gpm
Reference Table NFPA 11
Table A. Foam Application Rates for Fixed Roof Tanks.
Table 5.2.5.2.2 of NFPA 11
Bottled Water
Table B: Supplemently Hose
Selection Table
Table 5.9.2.2 from NFPA 11
Table C: Quantity of Fixed Foam
Discharge Outlets
Table 5.2.5.2.1 from NFPA 11
Mathematics
ONLY FOR FIXED ROOF TANKS
Table D. Foam Application Rates for Open Top & Internal Floating Roof Tanks.
Table 5.3.5.3.1 of NFPA 11
Fluid Handling
Table F: Foam Handlines and
Monitors; Application Rates
Table E : Supplementally Hose
Operating Time
Table 5.9.2.4 from NFPA 11
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Accidents & Disasters
Calculators & Reference Tools
Professional & Trade Associations
Table 5.2.4.2.2 from NFPA 11
NOTE: Before using this table, refer to clause
5.2.4.1.1 and 5.2.4.1.2
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