// multi-utility computation suite · offline · instant · precise
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eng.water-hammer-pressure Calculator
Calculates water hammer pressure surge from sudden valve closure using the Joukowsky equation and wave speed. Joukowsky pressure rise ΔP = ρaΔV — a 1 m/s flow velocity change in a steel pipe creates approximately 1.0–1.4 MPa of pressure surge.
Inputs
Pipe Velocity Ms
Speed in a specified direction (m/s). Required for momentum, kinetic energy, and wave calculations.
Wave Speed Ms
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Closure Time S
Duration of the process. Make sure units match the rate inputs (seconds, minutes, or hours).
Pipe Length M
Linear measurement. Ensure consistent units: 1 m = 1,000 mm = 3.281 ft.
Results
pressure surge (MPa)
Reference formula or conversion factor shown for context.
pressure surge (bar)
Reference formula or conversion factor shown for context.
critical closure time
The computed duration or time value.
closure type
The classification or type assigned based on the inputs.
Joukowski: ΔP = ρ×a×v
Reference formula or conversion factor shown for context.