Originally Posted By: rmoore
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Back when I was just starting?all those years ago?my SOP was to clamp my shiny new meter onto the first hose-bib I found without running any water first. This worked fine until the first house I found with excessive pressure…about 115 psi if memory serves. I made a note. Much later, in the crawl, I found that there was a pressure regulator. It was an older home, the water heater needed replacement, but the plumbing was copper and the pressure regulator looked to be relatively recent. While I?m completing the crawl I?m going over various scenarios in my head. Eventually I end up back outside and recheck the pressure after running the hose-bib for a few seconds. 70 psi! Back at the office, I discovered ?thermal expansion? while Googling around the net. I ended up recommending a new water heater fitted with a thermal expansion tank and, just to cover my butt, also suggested the plumber check the pressure regulator.
I also changed my SOP to always run the hose-bib for a while and then check the pressure.
While they won?t prevent backflow under all circumstances, pressure regulators do make a very effective check valve once excess pressure is on the demand side. With a backflow preventer and/or pressure regulator, and with no TX tank, you can get some pretty high readings if no water has been run since the heater last fired up.
I don?t know if this was the problem in Jeff?s case?it still could be a bad regulator?but I thought I?d share.
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