transient analysis - Issues on valve closure

[sifisain]

Hello Engineer,
I require your expertise to help me resolve my problem in my hydraulic model during transient analysis, I have a Firewater network after the closure of a valve for the event of 10,50,100,200, 500 secs pressure spikes above the maximum allowable pressure for the pipeline, and I don't see oscillating pressure in my graphs of the upstream pipeline of the valve which I closed. All of this transient analysis is done on pipenet. Can I get any help to resolve the surge pressure in my pipeline.

 

[goutam_freelance]

Simple way is to increase the valve closure time to reduce the surge pressure rise.

For manual calculation of surge pressure, you can use AWWA Manual M11

 

[sifisain]

I tried with 1800 secs( half hour) there its still the same with a very little difference.

 

[LittleInch]

Can't tell from that description, but sounds like there is something wrong with your model. But what i can't tell from here.

 

[georgeverghese]

Your description is too sloppy at the moment to tell what is going on.
"I have a Firewater network after the closure of a valve for the event of 10,50,100,200, 500 secs pressure spikes above the maximum allowable pressure for the pipeline,..."

 

[Doug Hunter]

Try reducing your simulation time step.