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Thread: Plumbing work around, 1.5" instead of 2"

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    Plumbing work around, 1.5" instead of 2"

    The liner I'm going with will go best with black fixtures, ie skimmer and return jets.
    Since the pool will be over 40,000 gallons, is there a way to accomplish effective filtering with 1.5" piping?
    Do I just need to add another skimmer and/or returns to accomplish more volume?

    Any help would be appreciated.

    BQ
    20 x 44 vinyl IG 44,000 gal, Pentair 3hp vs intelliflo, intellichlor and starite heater.
    8 x 10 viking Royal hot tub
    tf100 test kit with k-1000 kit.

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    Re: Plumbing work around, 1.5" instead of 2"

    Well, you don't say just how many you have now but, generally, 1.5" is too skimpy for that pool.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Plumbing work around, 1.5" instead of 2"

    The pool is not built yet. For some reason, Hayward and Pentair only makes the black skimmers and jets 1.5".
    20 x 44 vinyl IG 44,000 gal, Pentair 3hp vs intelliflo, intellichlor and starite heater.
    8 x 10 viking Royal hot tub
    tf100 test kit with k-1000 kit.

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    Re: Plumbing work around, 1.5" instead of 2"

    How many skimmers and returns are you currently planning?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Plumbing work around, 1.5" instead of 2"

    Most of the PB's have said two skimmers, 2 floor drains, and 4 returns.
    20 x 44 vinyl IG 44,000 gal, Pentair 3hp vs intelliflo, intellichlor and starite heater.
    8 x 10 viking Royal hot tub
    tf100 test kit with k-1000 kit.

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    Re: Plumbing work around, 1.5" instead of 2"

    It'll work like that. I would add one more skimmer, if it was my pool.

    I would also connect 2" pipe to all skimmers using a reducer bushing if your skimmer is 1.5".

    There are an infinite number of ways to increase/restrict your flow but the trade between 2" and 1.5" suction pipe is pretty cheap and reasonably effective.

    1.5" going to the returns is fine.

    I have a 43k pool with no bottom drain and I am glad I never put it in. Personal choice, though.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Plumbing work around, 1.5" instead of 2"

    The big problem with 1.5 inch pipe is not the momentary restriction at the return fitting or skimmer, but the accumulated friction loss down the length of the pipe, so you do gain a fair amount just by plumbing the runs with 2 inch, also will your planned layout home run all the pipes or will a single return pipe be plumbed to multiple return fittings. (same goes for skimmers and drains).

    Ike
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Re: Plumbing work around, 1.5" instead of 2"

    Quote Originally Posted by duraleigh
    It'll work like that. I would add one more skimmer, if it was my pool.

    I would also connect 2" pipe to all skimmers using a reducer bushing if your skimmer is 1.5".

    There are an infinite number of ways to increase/restrict your flow but the trade between 2" and 1.5" suction pipe is pretty cheap and reasonably effective.

    1.5" going to the returns is fine.

    I have a 43k pool with no bottom drain and I am glad I never put it in. Personal choice, though.
    Thanks Dave. So use 2" piping from floor drains and skimmers back to the pump. From filter side back to pool, 1.5 is ok?
    Isaac,
    All plumbing are single runs back to equipment pad. All returns, I hope will be done the same way. I'll verify that for construction time.
    20 x 44 vinyl IG 44,000 gal, Pentair 3hp vs intelliflo, intellichlor and starite heater.
    8 x 10 viking Royal hot tub
    tf100 test kit with k-1000 kit.

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    Re: Plumbing work around, 1.5" instead of 2"

    Yes, that sounds good to me.

    mas985 is a terrific systems guy when it comes to efficient flow. I am pulling this off the top of my head so let's see if he has better input than mine.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Re: Plumbing work around, 1.5" instead of 2"

    Waterway makes black 2" skimmers:Skimmer Catalog

    There is so little cost difference between 2" and 1.5", there really is no good reason to go with 1.5" plumbing anywhere. Also, it is much easier to clog a 1.5" pipe than a 2" pipe which is a better choice for the suction side plumbing. 2.5" is even better.

    Plus, I would use home runs (i.e. separate lines to/from equipment) for each main drain pair and skimmer. With a single suction line, you will not be able to isolate the suction ports if needed. Also, to minimize the chance of the pump drawing in air, you want much lower head loss on the suction side of the pump than the return side. If you do go with a single suction line, I would not use anything less than 2.5" plumbing.

    If you choose a single return line, then I would not go smaller than 2" plumbing. If you have more than 1 return line, 1.5" plumbing would be ok but again, there is really no good reason to use it.

    Also, I agree with Dave about the MD. They aren't really necessary as is described in this report: Pools Witout Main drains

    But you may want deep end returns if you have a deep end.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Plumbing work around, 1.5" instead of 2"

    Thanks Mark.
    Is there someone that does plumbing drawings without a floor/main drain for a builder to follow? I would love to skip a floor drain, especially after reading the link above, but I know the PB's are going to look at me like I have 2 heads when I ask them to do this. So a drawing of my requests with sizes of pipe would make it easy for them to follow.
    20 x 44 vinyl IG 44,000 gal, Pentair 3hp vs intelliflo, intellichlor and starite heater.
    8 x 10 viking Royal hot tub
    tf100 test kit with k-1000 kit.

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    mas985's Avatar
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    Re: Plumbing work around, 1.5" instead of 2"

    How deep will your pool be?

    You can also use a wall port instead of a main drain. Sometimes a skimmer is plumbed to l use these as vacuum release port should the skimmer get clogged. However, they can be put at any depth so you if you put them deep enough and set the float valves appropriately, you can get at least some circulation through those ports as well. Double duty.



    Another option is to plumb deep returns. You really should only need 1 of those since a return circulates water pretty well. This completely eliminates any possibility of entrapment and I believe it is much better for circulation than a deep suction port.

    The main advantage for both methods is that there is no plumbing under the pool so should something break, it is much easier to fix.

    As for a drawing, unfortunately, I don't have any. But if your PB gives you any trouble, print out the paper that I posted earlier and give it to him to read. Also ask he if he is a member of the APSP.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Plumbing work around, 1.5" instead of 2"

    Thanks Mark.
    I'm trying to go with a 10' deep pool, but again, there is pushback from both pool builders. One quoted $2000 to go from 9' to 10'.
    20 x 44 vinyl IG 44,000 gal, Pentair 3hp vs intelliflo, intellichlor and starite heater.
    8 x 10 viking Royal hot tub
    tf100 test kit with k-1000 kit.

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    Re: Plumbing work around, 1.5" instead of 2"

    My pool also does not have a main drain, and I have experienced issue with cool water pooling in the deep end in the past, I now have a venturi jetted return pointed down in the deep end, plus am using a robotic pool cleaner which helps stir the water which seems to keep the pooling problem under control.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    ~Remember TFP counts on your donations to keep this site ad free~

  15. Back To Top    #15

    Re: Plumbing work around, 1.5" instead of 2"

    Isaac,
    I plan on a robot too. However, is there a better remedy to avoid that pooling?
    20 x 44 vinyl IG 44,000 gal, Pentair 3hp vs intelliflo, intellichlor and starite heater.
    8 x 10 viking Royal hot tub
    tf100 test kit with k-1000 kit.

  16. Back To Top    #16
    mas985's Avatar
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    Re: Plumbing work around, 1.5" instead of 2"

    Deep end return. Basically a return that is a few feet off the bottom in the deep end.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Plumbing work around, 1.5" instead of 2"

    I suspect one reason you are getting push back re the deep pool is because their engineer will charge them more for the pool plans because it is a deeper pool. Pools that deep are not standard in the industry and often can't use the standard structural drawings.
    22k gallon IG pebblefina, Jandy 1.5 HP VS, Jandy CV Cartridge filter, Fafco solar panels, Polaris 360 supply side cleaner, waterfall

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