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  • Low pressure supply water line change

    1/2" copper supply line in over 60 years house had been changed to 3/4" copper pipe by city, but city changed only around curb stop which is located 60ft away from the water meter.

    Now I have realized the water pressure is better than before but it is not enough the peak demend time.

    The meter's inlet and outlet is 3/4" but used reducer to 1/2.

    So, I am thinking to change the 1/2" supply to 3/4 from the outlet of the meter to the first tee fitting (just before cold water supply line and hot water tank).

    If I do that it will be 3/4" supply then 1/2"(60ft) from curb box or near to meter and 3/4" from the meter to first tee fitting.

    They have
    1 bath tub
    2 toilet
    2 lavatory sink
    1 kitchen
    1 washing m/c
    1 laundry tray
    1 garden hose bib

    I will be about 17 fixture unit.
    If the water pressure is ok then they will make a shower booth.

    Do you think the water pressure will be better if the line after meter is changed to 3/4?

    I
    Please give me some advice.

    Thank you.

  • #2
    Re: Low pressure supply water line change

    What do you mean by a shower booth?

    J.C.

    Comment


    • #3
      Re: Low pressure supply water line change

      I mean they have only one bath tub and try to build a shower or another bathroom in basement but there water pressure is low.

      Comment


      • #4
        Re: Low pressure supply water line change

        Gotcha.

        What is the pressure?

        Is there a PRV?

        Any galvy distribution?

        2 stories?

        The quick answer is that it "should" be ok with 3/4" supply from the meter to inside the house but you have to factor in everything.

        J.C.

        Comment


        • #5
          Re: Low pressure supply water line change

          What is the pressure?

          Not sure but less than 16L/min (which is our city is minimum)

          Is there a PRV?

          None

          Any galvy distribution?

          No

          2 stories?

          Yes.

          What kind of other factors?

          Thank you.
          Last edited by khlee815; 12-14-2008, 11:35 PM.

          Comment


          • #6
            Re: Low pressure supply water line change

            16L/min is Volume-right? What's the actual PSI?

            Plus, you have a minimum of 16L/min minimum for a 3/4" meter. You have an immediate restriction so that number is gone. Removing the restriction will give you 4.22 gallons/min. which is pretty low here if I understand this right. That's less than 2 showerheads.

            J.C.

            Comment


            • #7
              Re: Low pressure supply water line change

              I have not checked but pretty sure it is less than 40 psi.

              Comment


              • #8
                Re: Low pressure supply water line change

                No wonder they're having some problems.

                A maximum of 4.22 gpm at 40 psi plus friction loss and a second story= problems.

                J.C.

                Comment


                • #9
                  Re: Low pressure supply water line change

                  Toronto's minimum water pressure is 276kPa which is about 40psi.

                  Comment


                  • #10
                    Re: Low pressure supply water line change

                    Originally posted by JCsPlumbing View Post
                    No wonder they're having some problems.

                    A maximum of 4.22 gpm at 40 psi plus friction loss and a second story= problems.

                    J.C.
                    Is it?
                    Hum... I asked their neighbor and they are satisfied their water pressure.

                    Can a old meter restrict water pressure?

                    Their water line is 1/2" soft copper tube.

                    Comment


                    • #11
                      Re: Low pressure supply water line change

                      Is there any water mimimum pressure in your place?

                      Comment


                      • #12
                        Re: Low pressure supply water line change

                        What satisfies a person is subjective. I'm going off the numbers you are providing.

                        Run the 3/4" line. If they aren't satisfied then they'll have to explore other options such as paying for a commercial meter or a booster pump system.

                        J.C.

                        Comment


                        • #13
                          Re: Low pressure supply water line change

                          Thank you good night.

                          Comment


                          • #14
                            Re: Low pressure supply water line change

                            The City of Toronto will let you run whatever size copper line to your house that you want. I ran a 1 inch copper "K" type line to the property line (which I paid and installed) at which point the city ran a new 1" copper line from the street main and joined it to mine with a Mueller valve (which they paid for). The basement is all 1 inch then goes to 3/4 inch and 1/2 inch upstairs to the 3rd storey. NO PROBLEMS FOR WATER NOW!!!

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