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Thread: Return pipe pressure loss.

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    Join Date
    May 2015

    Return pipe pressure loss.

    Our 50 year old 85000 gal pool is under renovation for new plumbing, skimmers and equipment. 5 HP pump, 6" main drain line, 4" return. The other day he spliced the 3" dia east and west side of pool returns into one 3" dia line for approx 20' to go into the pump room and connect to the 4" dia manifold from the filter. A flow of 250gpm in 3" dia sch80 pipe is approx 12 fps, which is way more than the 5 -6 fps engineers usually target. So I looked on the drawing and saw, yes, in fact the engineer specified the 3" dia lines should connect to the 4" dia main indepentantly. They sould not be bushed down. Below is a picture.ReturnPlumbing2.jpg
    Inground 85000 gal dry gunite pool

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: Return pipe pressure loss.

    Welcome to TFP!!!

    Is there a question here?

    If the pipe is not done to the drawing, then you should get the plumbers to fix it.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Return pipe pressure loss.

    Yep. Plumber blew it. Tell him, not us. Don't let them fill in the trench until it's right.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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