What is the formula to find pressure loss in fire fighting pipe lines?

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The British fire and rescue services use the following formula for calculating the pressure loss due to friction in firefighting hose: Pf = 9000 f l L2 / d5 bar where Pf is the frictional loss of pressure, in bar
f is the friction factor
f = 0.005 for 70 mm or 45 mm hose
f = 0.007 for 90 mm hose
(for 90 mm hose it is higher to allow for losses in the couplings, which are but 64 mm diameter)
l is the length of the hose line, in metres
L is the flow rate, in litres/minute
d is the hose diameter, in millimetres The formula is approximate, and relates to internally lined hose in 25 metre lengths. You will find the formula in the old Manual of Firemanship, Book 7, Hydraulics, pumps and pump operation. David Hayward, former MIFireE

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