Thumb rule for surge pressure calculation

[extremechanical]

Hi could any tell, how to quickly approximate surge pressure due to valve closing or pump stoppage?

Also I want to know if the surge pressure be more than pump dead head pressure due transients repetitions?

Thanks a lot !

 

[BUGGAR]

Nobody answered so here's a shot from the building industry. During a fire hydrant test, the hydrant valve stem failed and the valve slammed shut. The resulting (what we call) water hammer, caused an 8 inch sprinkler main in an adjacent building to drive itself and attached sprinkler laterals right out the end of the building. It was a wet system and system pressure could never approach that. A truly fantastic sight!

 

[DSB123]

Use the Joukowsky equation - assume the flow is instantaneously stopped.