Fire Pump Driver HP Sizing Calculator

Size electric motor or diesel engine driver horsepower for fire pumps per NFPA 20 based on pump flow, pressure, and efficiency

Input Parameters

Results

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Brake Horsepower at Rated
HP
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BHP at 150% Flow
HP
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Selected Driver HP
HP
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Driver Notes
Note: NFPA 20 requires electric motors to be non-overloading at any point on the pump curve. Diesel engines must deliver rated HP at 150% of rated pump flow. Altitude derating applies to diesel engines per NFPA 20 Chapter 11.

Reference

Fire Pump Driver Sizing (NFPA 20): BHP = (Q × P) / (1714 × eff) Q = flow (gpm), P = pressure (psi), eff = decimal Electric: non-overloading at any point (NFPA 20 Sec 9.4) Diesel: rated at 150% flow, derate 3% per 1000 ft above 300 ft Standard HP: 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 100...500