How to calculate required valve closure times to prevent surge..

[jamesbanda]

Dear sirs,

I've read lost of really detailed articles about pipeline surge or water hammer. I am working on project with short lines <2 km. Most less than 300meters, I want to calculate if there is likely to be a surge problem and if i need to specify slow closing valves.

Can anyone please point me in the correct direction of a calculation guide.

 

[gr2vessels]

Try this:

http://www.lmnoeng.com/WaterHammer/WaterHammer.htm

Cheers,
gr2vessels

 

[MortenA]

300 m could cause surge. The rule of thum is that the closing time of a valve should be more than twice the length divided by the speed of sound in the liquid. But then again what if a valve is almost closed at the steady state flow condition?

Perry has a short primer on the subject.

Best regards

Morten

 

[BigInch]

You have to be more careful with valves patterns that allow almost full flow to continue until they reach about 10% open, then stop all remaining flow from there to 0% open. A long closing time doesn't do much good with those types of valves.

http://virtualpipeline.spaces.msn.com

"What gets us into trouble is not what we don't know, its what we know for sure" - Mark Twain