PRV'S in EPA NET
PRV'S in EPA NET
(OP)
I have got my model up and running, but I'm still having issues, so if someone could chime in on the following I would appreciate it.
My model has a high point and a low point. The low point needs to have PRV'S in place to keep the pressure down. I have 5 prv's in the model all set on 80. Also, the model only has one source, a reservoir with an HGL. I am attempting to tie onto another offices model without fully re-creating their model.
Question Number 1: Is it correct to put the actual pressure you want the PRV set to, or should it be set to an elevation?
Issue #1: the nodes close to the PRV's are at 80, but as I go down the pressure creeps up to 110. This is over 4,500 L.F. and a elevation difference from 5416 to 5360. The PRV is near the 5416 elevation.
Issue #2: only one of my PRV's are opened by the model, all of the others have been closed by the model after I run it. Therefore, I am not getting the flow I think I should be getting because the water is having to come half way around the world to get to the node rather than through the PRV.
I hope that I have been clear and I hope someone can help me.
Thanks Rich
My model has a high point and a low point. The low point needs to have PRV'S in place to keep the pressure down. I have 5 prv's in the model all set on 80. Also, the model only has one source, a reservoir with an HGL. I am attempting to tie onto another offices model without fully re-creating their model.
Question Number 1: Is it correct to put the actual pressure you want the PRV set to, or should it be set to an elevation?
Issue #1: the nodes close to the PRV's are at 80, but as I go down the pressure creeps up to 110. This is over 4,500 L.F. and a elevation difference from 5416 to 5360. The PRV is near the 5416 elevation.
Issue #2: only one of my PRV's are opened by the model, all of the others have been closed by the model after I run it. Therefore, I am not getting the flow I think I should be getting because the water is having to come half way around the world to get to the node rather than through the PRV.
I hope that I have been clear and I hope someone can help me.
Thanks Rich





RE: PRV'S in EPA NET
Since your PRV's are set to 80 but are at different elevations only the highest one will be open unless friction losses drop the pressure locally to activate a second PRV.
80 psi would be a high set point for a PRV. A common application for the PRV is pressure entering at 80 psi and exiting at 45 psi.
80 psi being the maximum pressure per the plumbing code and 45 psi being a good minimum target pressure for services to provide full service while allowing for upsets such as fire flows to maintain the minimum of 20 psi
Hydrae