Had irrigation system installed 2 months ago. Due to location of meter and PRV, the POC was after PRV. After done was told pressure too low even though static pressure was at 63psi, dynamic flow was 45-47psi. Had plumber change POC before PRV and ran this in 1" PEX from front of basement to rear basement and out to backflow. The house pressure is at 65 but the irrigation line is now 130psi.
Now irrigation guy said will need a pressure reducer at the valve box

My main concern now is that I have a charged line running from front of basement to back of basement that is charged at 130psi.
How concerned do I need to be?

  • What material and size was used for the 130 psi line? – pdd Aug 4 '18 at 1:48

It will depend the material used, the diameter of the pipe, and the temperature.

What you want to know is what is the maximum working pressure of the material that was used. Most likely it will be higher then 130 psi. Some examples are:

Regardless, you will need a PRV. If it was me, I would install the new PRV on the line near the point of connection to the main. Then, adjust the PRV so that you have the desired pressure at the irrigation box.

  • The line that runs the 130psi is PEX 1 inch, rated 160psi. I did ask plumber to use 200 but was not here when he installed. A – Kevin Cantwell Aug 4 '18 at 12:52
  • ppd- thanks for responding to my post. Posted above early Water main comes in through floor in front basement- temp about 65-75, depends- but immediately has meter, the POC for irrigation, then PRV- which is new. The irrigation line is PEX 1 inch, rated 160psi. Runs to rear of basement to copper 1 inch about 1 foot before exiting house to backflow. So are you saying to put PRV before irrigation POC and reduce everything or add a second PRV as close as possible to POC for irrigation and reduce pressure from there. I see how that would help and could get the pressure to needed mark.Thanks – Kevin Cantwell Aug 4 '18 at 13:08
  • I'm saying the second thing, that is put a second PRV on the irrigation line as close to the POC. – pdd Aug 4 '18 at 20:17

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