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Water Hammer

This document provides information about calculating water hammer pressure in pipes. It describes water hammer as an abrupt change in flow velocity that generates a pressure wave. The tool uses the Joukowsky equation to estimate the peak pressure when a valve closes against flowing liquid. Input data about the pipe dimensions, flow rate, and fluid properties are used to calculate the surge pressure without a full surge analysis. The results show the calculated surge pressure of 4170.8 kPa for the given pipe system.

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Rocky Sasele
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31 views1 page

Water Hammer

This document provides information about calculating water hammer pressure in pipes. It describes water hammer as an abrupt change in flow velocity that generates a pressure wave. The tool uses the Joukowsky equation to estimate the peak pressure when a valve closes against flowing liquid. Input data about the pipe dimensions, flow rate, and fluid properties are used to calculate the surge pressure without a full surge analysis. The results show the calculated surge pressure of 4170.8 kPa for the given pipe system.

Uploaded by

Rocky Sasele
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Pipeline Engineering

Water Hammer Calculation ver 0.0


https://pipeeng.com/water_hammer.html

Project ABC Project Developer PipeEng


Date 30/05/2023, 4:24:51 pm Approver
Revision 0 Reviewer

An abrupt change in the velocity of a flowing liquid in a pipe generates a pressure wave, which is commonly
referred as "Water Hammer".This tool was developed using the Joukowsky equation to provide you with a
simplified method for calculating the peak transient pressure experienced when a valve is closed against a fluid
in motion. Absent a formal surge analysis, this tool can be used to obtain an estimate of the magnitude of a
surge pressure.

Input Data
Pipe Diameter, D mm 114.300
Pipe Wall Thickness, t mm 6.020
Flowrate, Q m³/s 0.03
Weight of Fluid, W kg/m³ 999.6
Liquid Bulk Modulus of Elasticity, k MPa 2068
Pipe Young's Modulus of Elasticity, E MPa 199948
Pipe Poisson Ratio, μ 0.30
Dimensionless Parameter due to System Pipe-Constraint Condition, c 0.91

Result
Pipe Inner Diameter, d mm 102.26
Fluid Velocity, V m/s 3.13
Wave Velocity, a m/s 1335.5
Surge Pressure, ΔP kPa 4170.8

Downloaded on 30/05/2023, 4:24:51 pm from pipeeng.com Page 1 of 1

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