Pipeline Engineering

Water Hammer Calculation

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.

Select "Custom" for manual pipe OD and wall thickness inputs.
Select "Custom" from "Pipe Nominal Size" above for manual pipe OD and wall thickness inputs.
inch
inch
lb/ft³
psi
psi
 
 
Default value conservatively assumes that pipe is anchored to against its longitudinal movement throughout its length. If expansion joints are used, c is equal to 1. User may use a more proper value to suit your restrain conditions.