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Thread: Pump and pipe sizing help.

  1. #1
    DIY Junior Member Mporter444's Avatar
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    Default Pump and pipe sizing help.

    I am looking to use a well that is across the street from my house and I would like to know if the existing pump is the right size and if so what size pipe to run.

    The existing pump is a 1hp.
    Not sure of the GPM and the depth is a question mark also.This well was already put in when the land was purchased.
    it is a submersible pump though.
    I would like to run from this well to approximatly 600 feet to my house. The grade change is down hill from the well to the house at about a 4 ft. drop.
    I would like to have the pressure at my house to be what it is set at now (40-60 psi).

    I was going to run 1-1/4" at least half way and then change over to 1". (any ideas)?
    To check the output of the well we ran the pump for about 4 hours so the capacity seems to be alright.
    I assume the pump GPM to be around 10 (that is pretty typical right?)

    anyhelp on the sizing of the pump and pipe size to my house would be great! I know the well pump depth and water level are mysteries but if we could use worse case averages I think it will be okay.

  2. #2
    Moderator valveman's Avatar
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    A 1 HP, 10 GPM should build plenty of pressure. But the depth of the well or at least the water level is important. I would just stay with 1 ” all the way. A long distance of small pipe is a pressure killer.

  3. #3
    DIY Junior Member Mporter444's Avatar
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    Should I run 1-1/2" about 250 feet then run 1-1/4".
    Also I assume sch. 40 pvc is okay....
    And what size chase should I under the road 2"?
    Do I need any check valves?
    Thanks.

  4. #4
    Moderator valveman's Avatar
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    At 15 GPM, 1" pipe loses 5.08 PSI per hundred feet. 1 1/4" loses 1.34 PSI per hundred, and 1 1/2" loses .63 PSI per hundred. So the 1 1/4" will be fine, 1 1/2" won't hurt anything, but 1" would lose 30 PSI in 600'.

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