Pump Churn Pressure Calculator

Calculate fire pump churn (shutoff/no-flow) pressure per NFPA 20 requirements and verify it does not exceed system rating

Input Parameters

Results

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Estimated Churn Pressure
psi
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Total Churn (suction + pump)
psi
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Max Allowed per NFPA 20
psi
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System Status
Note: Churn (shutoff/dead-head) pressure is the maximum pressure a pump develops at zero flow. NFPA 20 limits this to 140% of rated net pressure. All piping, fittings, and components downstream must be rated for the total churn pressure including suction pressure.

Reference

NFPA 20 Churn Pressure Requirements: Churn (shutoff) pressure <= 140% of rated net pressure Typical centrifugal pump churn ≈ 120% of rated Total churn = suction pressure + pump churn pressure System components must be rated for total churn pressure. NFPA 20 Section 4.7.3.