Hydraulic Loss in Fire Hemp-Hose

Abstract

In this report the loss of head in fire hemp-hoses due to friction, leakage and repaired trails is treated. The results are follows : 1) The coefficient of frictional loss by new hoses is
λ=0.040-(6/1,000)υ, where υ=mean velocity in hose, m/sec.
2) The effects of leakage upon λ are expressed by using (1+q/Q) λ instead of λ, where q=quantity of leakage m³/sec, Q=quantity of discharge m³/sec.
3) The effects of repaired trails, and ages of hose
Y are expressed by Δh_υ=ζ(υ²/2g), ζ=0.014(n+S√Y m)/υ where n,m=number of trails, S=factor on proficiency of repair, υ=mean velocity.