I was out and about most of the day yesterday running errands and what not, when I came back home around 3pm I discovered water running out from underneath my MH. I immediately went to the water meter by the sidewalk and shut the water off at the main. I called maintance to come asses and fix the problem. They came out and had everything working in about 2 hrs. My water lines were not frozen and I know this was not the cause of the leak. When I left that morning, the water was running fine, it didnt get that cold the night before and the temp the next morning was up to about 44*, so I know it was not froze. The plumber that came out said the PVC pipe that runs between the cooper water main line and the PEX in my MH just came apart. He said this happened because the water depart had the meter main turn on all the way putting too much water pressure on the PVC. This is the same guy that came out to make the connection between the meter and the MH. BUT!!!! There is a pressure regulator supplied by the MH Mfg that is connected to the line before the PVC. So its set up in this order, COPPER MAIN, WATER METER/SHUTOFF, COPPER MAIN, PRESSURE REG., PVC, SHUTOFF VALVE, PEX, The PEX goes up inside the MH and then there is another shutoff in the utility room. The pressure reg is preset @ 50psi and is not adjustable. So if the pressure reg is BEFORE the PVC how would water meter main being turned on all the way be the cause of this mishap. The plumber tested the regulater while he was out and it checked out fine. When turned on the meter main after repairs he only turned it on "halfway". He said to keep it like that to prevent from happening again. Which is great but now if someone is using the sink or in the shower and you flush the toilet or turn on another faucet, you can feel the water pressure drop out until the other faucet is turned off. Its not a really big drop out but you can definitely tell the difference. It didnt do this before, when the meter main shutoff was on all the way, and the meter valve has been open all the way for the last 4 months with no issues until yesterday.
Was the plumber right with his reason for the burst pipe, or was he maybe just trying to cover his rear, knowing he didnt seal the PVC good enough to begin with. If the regulater is BEFORE the PVC, then does it really matter how how the meter main is turned on?
Sorry for such a lengthy post but I wanted to include all the details.