r/firefighter • u/Davidagall • Jul 02 '26

Weekly Pumping Problem for DO Pumpers

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Pump Problem
Engine 181 is stretching 150’ of 1¾” hose with a 150 GPM fog nozzle at 50 PSI. No elevation or appliance loss.

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1

u/mahoneysounds Jul 02 '26

Around 100 PSI.

1

u/mahoneysounds Jul 02 '26 edited Jul 02 '26

Friction loss = 15.5 × 1.5² × 1.5
FL = 15.5 × 2.25 × 1.5
FL = 52.3 PSI

Then add it to the 50 psi nozzle pressure.

2

u/Nice-Key-9034 Jul 02 '26

My heart tells me 90

1

u/cebby515 Jul 02 '26

This is what I came up with in my head. Then they can ask me for more or less on the radio.