Fire Hose Friction Loss

Calculate friction loss in fire hose using standard coefficients.

Hose Type/Size

Flow Rate (GPM)

Hose Length (ft)

Elevation Change (ft)

Positive = uphill, Negative = downhill

Number of Appliances

Wyes, siamese, etc. (5 PSI each)

Hose	100 GPM	150 GPM	200 GPM	250 GPM
1.75"	15.5	35	62	97
2.5"	2	4.5	8	12.5
3" LDH	0.68	1.5	2.7	4.2
5" LDH	0.08	0.18	0.32	0.5

Formula: FL = C x (Q/100)^2 x (L/100)

Friction Loss Results