Hello all—

Running Infoworks WS with either the built-in pump controls or UPC, we have issues with "chatter". For example, I have a booster station, upstream are pumps and downsteam is a tank with a PSV and float valve. At 1 minute timesteps, my downstream pressure will fluctuate from 75 psi to 205 psi for an hour of model time and then slowly reduce to 75 psi to 120 psi.

I'm not sure what's causing this? I suspect transients. Is there a way I can check to see which object is cause the problem? or is there a way to diagnose the problem?

Thanks in advance.