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Thread: Correct pipe sizing for a pool remodel

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    Correct pipe sizing for a pool remodel

    We're getting ready to renovate our backyard. While we tear up the deck, we want to replumb our pool [it's a 30yr old pool w/ 1.5" pipes, one return line, etc...]. Since I have no desire to rip up our yard a second time, I want to make sure that we're specifying the best pipe sizes.

    Some details on our setup...
    . the pool is roughly 25K gallons and 35' by 15'
    . we have a Pentair Intelliflow VF main pump
    . we're planning on using a robotic sweep
    . we have an attached spa w/ 4 jets

    The PB has currently recommended the following for the pool:
    2.5" pool suction
    2.0" return, w/ 4 1.5" inlets to the pool

    And, for the spa:
    2.5" spa suction
    2.0" return
    2.0" booster w/ 2" venturi line

    I'm thinking the pipe sizing is a bit under sized. I would expect at least 2.5" return for the spa. And most likely the same for the pool. Our goal is to reduce energy consumption [which is why we went with the Intelliflow in the first place].
    12k gallon, AG, pebble, sand filter, 1hp single speed pump

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    Mod Squad Bama Rambler's Avatar
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    Re: Correct pipe sizing for a pool remodel

    Welcome to TFP.

    That doesn't look too bad. I like seeing the suctions larger than the returns. I would run all the suction and returns back to the pad individually.
    Dave J. TFP Moderator
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    Re: Correct pipe sizing for a pool remodel

    +1 what bama said. The pipe sizing looks just about right.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Mod Squad jblizzle's Avatar
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    Re: Correct pipe sizing for a pool remodel

    If all the pool returns were plumbed individually to the pad, then 2" might be overkill. But there is really nothing wrong with going bigger as it will lower head loss and increase flow rate.
    Jason, TFP Moderator
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    mas985's Avatar
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    Re: Correct pipe sizing for a pool remodel

    How long are the runs?

    For the spa, I would use all 2.5" pipe including the air vent.

    But what is meant by 2" Booster? Is that a air blower? If designed properly, the air vent should not need a blower. Just make sure he puts in a Hartford loop near the spa to prevent the air pipe from filling with water.
    Mark
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    Re: Correct pipe sizing for a pool remodel

    Quote Originally Posted by jblizzle
    If all the pool returns were plumbed individually to the pad, then 2" might be overkill. But there is really nothing wrong with going bigger as it will lower head loss and increase flow rate.
    It's spec'd to be a loop with a single line to the pad.
    12k gallon, AG, pebble, sand filter, 1hp single speed pump

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    Re: Correct pipe sizing for a pool remodel

    Quote Originally Posted by mas985
    How long are the runs?

    For the spa, I would use all 2.5" pipe including the air vent.

    But what is meant by 2" Booster? Is that a air blower? If designed properly, the air vent should not need a blower. Just make sure he puts in a Hartford loop near the spa to prevent the air pipe from filling with water.
    Yes. That would be the line for a blower. The spa is around 60' from the pad -- where all of the lines will be run to.

    I don't know what a Hartford Loop is. Time to do a little more research!
    12k gallon, AG, pebble, sand filter, 1hp single speed pump

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    Administrator Leebo's Avatar
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    Re: Correct pipe sizing for a pool remodel

    Whatever size you use please make sure the PB uses unions. Nothing bugs me more than seeing brand new pools installed without any way to disconnect the pipes if ever a problem comes up.

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    Re: Correct pipe sizing for a pool remodel

    Quote Originally Posted by Leebo
    Whatever size you use please make sure the PB uses unions. Nothing bugs me more than seeing brand new pools installed without any way to disconnect the pipes if ever a problem comes up.
    Where would the unions be? On every valve / piece of equipment? Or, on every pipe coming out of the ground?
    12k gallon, AG, pebble, sand filter, 1hp single speed pump

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    Re: Correct pipe sizing for a pool remodel

    Where would the unions be?
    Most importantly on both sides of the pump. Others are optional wherever you think you might eventually need to change out or modify something.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Correct pipe sizing for a pool remodel

    I'll ask the PB to use 2.5" for the spa return so we'll have plenty of water flow, but, will leave the rest of the system alone.

    Thanks for all the info.
    12k gallon, AG, pebble, sand filter, 1hp single speed pump

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