Firefighter Math · Question
If a nozzle is flowing at 250 GPM and the pump pressure is 150 PSI, what is the approximate friction loss per 100 feet of 2.5-inch hose, if the friction loss for two 100-foot sections is known to be 80 PSI? (This is a simplified scenario for estimation).
If two 100-foot sections have a friction loss of 80 PSI, then one 100-foot section would have half that, which is 80 PSI / 2 = 40 PSI.
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Question: If a nozzle is flowing at 250 GPM and the pump pressure is 150 PSI, what is the approximate friction loss per 100 feet of 2.5-inch hose, if the friction loss for two 100-foot sections is known to be 80 PSI? (This is a simplified scenario for estimation).
Answer options:
- 20 PSI
- 30 PSI ✅ 40 PSI
- 50 PSI
Correct answer: 40 PSI
Explanation: If two 100-foot sections have a friction loss of 80 PSI, then one 100-foot section would have half that, which is 80 PSI / 2 = 40 PSI.
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