Water Hammer Calculation for Pressure Increase
English

Use this online Water Hammer Calculator to find the Pressure increase in water hammer. Water hammer (fluid hammer) is a pressure surge or wave that occurs when the fluid flowing in a particular direction is forced to stop or change direction. The below water hammer calculator helps you calculate Pressure Increase (P), Flow Velocity (V), Upstream Pipe Length (L), Valve Closing Time (t) and Inlet Pressure (Pi) alternatively with the other known values.

ft/s
ft
s
pound/inch2
pound/inch2
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Formula:

P = ((0.07 × V × L) / t) + Pi V = ((Pi - P) × t)/(0.07 × L) L = ((Pi - P) × t) / (0.07 × V) t = ((0.07 × V × L) / (P - Pi) Pi = P - ((0.07 × V × L) / t) Where, P = Pressure Increase V = Flow Velocity L = Upstream Pipe Length t = Valve Closing Time Pi = Inlet Pressure
Water Hammer Pressure

Example:

Water Hammer Calculation for Pressure Increase Find the pressure increase in water hammer if the flow velocity, upstream pipe length, valve closing time and inlet pressure values are 23 ft/s, 10 ft, 5 s and 7 pound / inch2.

Solution:

P = ((0.07 × 23 × 10) / 5) + 7
= 10.22 pound / inch2

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