3/4 tap 1/2 mile to house

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    • #276761
      Avatar photoGARY AND LISA CONNOR

        I’ve got a 3/4 tap and 1/2 mile to the house i ask several different plumbers and suppliers and some say increse to 1 1/4 at tap to house then 3/4 into house and some say 3/4 all the way whos right and how do i run with minamal pressure lose. elevation is aprox. 30′ below tap and 60psi at tap i’m running to 1 bath , kit. washer (2 bedroom cabin)

        » This message has been edited by 1/2 mile water line on 15 July 2003

      • #294735
        Avatar photoRetired plbg1

          I will tell you what i got. I got a 3/4″ tap to 1″ pipe 800′ long 90# press. When I use water in house I can hear it run like a tank loosing water , when it shuts off you can hear it fill up. So It depends on your Press. but i would get 3- 3/4″ taps and run 1-1/4″ into house and reduce at 1ST bath and go from there. It also depends on how many fix. you have, also check with your water co. on press. and length you have to go. In St. Louis Co. Mo. we use 2- 1″ taps for 1-1/4″ and 3 -1″ taps for 1-1/2″.

        • #294736
          Avatar photoGarySlusser

            Before you get into this project much farther, I think you should do some reading. The size of the pipe is critical and if you want satisfactory water flow and pressure, you need to know how to calculate that correctly.

            The pressure, type of material the pipe is made of, the elevation from the point you feed from to the point a 1/2 mile away, the water temperture and number and type of fittings etc. all play a part. Then when you get to the building, you have a number of factors to figure in using the same as above again.

            Actually you start at the building by determining how much water you need at what pressure and work toward the water source. Here are a few URLs as a start.

            I suggest 200 psi rated polyethylene tubing with as few fittings as possible; none other than one on each end being the best. You can get up to 5000′ (continous) rolls.

            Quality Water Associates

          • #294737
            Avatar photoRobert Stephen Morton

              Your question is incomplete!
              To even calculate the pressure losses needs more info.
              What is the pressure at the tapping? Is there any elevation rise to the final outlet?
              What do you need in pressure & flow at the outlet?
              I have seen a water line run 1 mile in 1/2″ copper & the pressure would rise to the tapping pressure after 1/2 an hour but when the outlet tap was opened, not a drop issued out of the tap.

            • #294738
              Avatar photonicktheplumber

                I’ve never had to run 1/2 mile of supply pipe to a residence, but I can tell you that the best (i.e. smooth plastic or copper) 3/4″ supply pipe from a high pressure (>60psi) allows for at most 13 (and at least 6) fixture units of water per 200 feet of pipe. 1/2 mile is about 2500 feet, and 2500 divided by 200 is about 12.5. At best, this would allow you just over 1 fixture unit of supply…My calculations would suggest you need at least 1 1/4″ to 1 1/2″ of smooth bore supply pipe to provide good flow to one bathroom and one kitchen/laundry.

                Don’t take my word for it…consult an engineer.


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