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Chapter: Environmental Engineering - Demand For Water

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Empirical formulas for fire demand

A) KULCHILING'S FORMULA : B) FREEMAN FORMULA : C) NATIONAL BOARD OF FIRE UNDERWRITER'S FORMULA : D) BUSTON'S FORMULA - It states that


DEMAND FOR WATER

 

EMPIRICAL FORMULAS FOR FIRE DEMAND

 

A)    KULCHILING'S FORMULA : It states that

 

Q   3182  p

(at a demand rate to be maintained at hydrants of 1-1.5 kg km2 lasting For 3 hrs) where

 

Q = amount of water required in litres/min P = population in thousands.

 

B) FREEMAN FORMULA : It states that

Q=1136.5

 

 

p

10   and

 

 

 

10

 

 

 

 

 

y2.8

p

 

Where

y   = period of occurrences of fire in years

 

Q and Ąp? are same as above

C)    NATIONAL BOARD OF FIRE UNDERWRITER'S FORMULA

FCPA central congested high valued city

i. When population is

2,00,000

 

 

 

 

 

Q = 4637   p  1

D.D1  p

ii. When population is > 2,0,000 a provision for 54600 litres/ min may be made with an extra additional provision of 9100 to 30400 litres/min for a second fire.

 

For a Residential City            

1.       Small low buildings   = 2200 litres/min     

2.       Large and higher buildings      = 4500 litres/min 

3.       High value Residences apartment and tenements = 7650-1350 litres/min

4.       Three storeyed buildings         = 27,000 litres/min

 

D) BUSTON'S FORMULA - It states that

Q = 5663  p

 

All the above formulae suffer from the drawback, that they are not related with the type of area served. These formulas therefore give equal results for industrial and non industrial areas, although the possibility of occurrence of a fire with of given duration is more for an industrial area as compared to the non-industrial area.-

 

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