Firefighter Math · Question
If pump discharge pressure (PDP) is 180 PSI and nozzle pressure (NP) is 100 PSI, what is the total friction loss plus appliance loss between the pump and nozzle in the hose lay (simplified)?
Total pressure loss between the pump and nozzle is PDP - NP. So, 180 PSI - 100 PSI = 80 PSI.
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Question: If pump discharge pressure (PDP) is 180 PSI and nozzle pressure (NP) is 100 PSI, what is the total friction loss plus appliance loss between the pump and nozzle in the hose lay (simplified)?
Answer options:
- 50 PSI
- 60 PSI
- 70 PSI ✅ 80 PSI
Correct answer: 80 PSI
Explanation: Total pressure loss between the pump and nozzle is PDP - NP. So, 180 PSI - 100 PSI = 80 PSI.
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