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HWT excess pressure

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  • HWT excess pressure

    Got a favor for a friend lined up for sometime in the near future: Hot water tank whose T & P valve keeps blowing off....yes there is a swing check on the cold water line. I figure that if the valve itself is OK (I will replace if old or if I suspect a clog), I can either remove the check OR install a cushion tank in the hot line.

    what's the best option do ya think?

  • #2
    Re: HWT excess pressure

    install or check the expansion tank. also check street pressure, you may need a pressure reducing valve.
    No, it's not rocket science, it's plumbing and unlike rocket science it requires a license.

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    • #3
      Re: HWT excess pressure

      Originally posted by Black Santa View Post
      Got a favor for a friend lined up for sometime in the near future: Hot water tank whose T & P valve keeps blowing off....yes there is a swing check on the cold water line. I figure that if the valve itself is OK (I will replace if old or if I suspect a clog), I can either remove the check OR install a cushion tank in the hot line.

      what's the best option do ya think?
      Why the swing check?

      J.C.

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      • #4
        Re: HWT excess pressure

        Just a guess but could the water be expanding as it gets heated, the swing check keeps the now higher pressure water from going back to supply, all outlets in the house are closed and the higher pressure water can only exit via T&P? Sometimes my two cents aren't worth two cents but this is my expanation. Thanks, David

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        • #5
          Re: HWT excess pressure

          Originally posted by Thurman View Post
          Just a guess but could the water be expanding as it gets heated, the swing check keeps the now higher pressure water from going back to supply, all outlets in the house are closed and the higher pressure water can only exit via T&P? Sometimes my two cents aren't worth two cents but this is my expanation. Thanks, David
          thats the most likely scenario imo. an expansion tank should help
          No, it's not rocket science, it's plumbing and unlike rocket science it requires a license.

          Comment


          • #6
            Re: HWT excess pressure

            Originally posted by JCsPlumbing View Post
            Why the swing check?

            J.C.

            I have no idea! The original installer put it there. There's no recirq line so there wouldn't be any need for a check, really.

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            • #7
              Re: HWT excess pressure

              Originally posted by Thurman View Post
              Just a guess but could the water be expanding as it gets heated, the swing check keeps the now higher pressure water from going back to supply, all outlets in the house are closed and the higher pressure water can only exit via T&P? Sometimes my two cents aren't worth two cents but this is my expanation. Thanks, David
              that was my diagnosis too, what I'm wondering is whether to add the expansion tank or remove the check valve, personally i'm leaning towards installing the expansion tank.

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              • #8
                Re: HWT excess pressure

                Originally posted by Black Santa View Post
                that was my diagnosis too, what I'm wondering is whether to add the expansion tank or remove the check valve, personally i'm leaning towards installing the expansion tank.
                since you'll have it apart, why not do both?
                No, it's not rocket science, it's plumbing and unlike rocket science it requires a license.

                Comment


                • #9
                  Re: HWT excess pressure

                  Originally posted by MoJourneyman View Post
                  since you'll have it apart, why not do both?
                  might as well. I don't think it's there for any reason. Like i said there's no recirq line so no reason to have a check.

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