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Thread: 2" Piping....Do I have to have it

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    2" Piping....Do I have to have it

    Do I need to throw away the 1.5" piping that the pool store gave me and go with 2" on my pool? I have read that 1.5" pipe only flows 47gpm and 2" flows 73gpm. If my math is right, I need to flow 50 gpm with my pool...
    30'x54" Round Vogue Simbio AG ~21,000 gallons
    Pentair Sand Dollar SD 60 w/ Pentair Dynamo 1.5 hp Pump
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    Mod Squad jblizzle's Avatar
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    Re: 2" Piping....Do I have to have it

    There are really no true limits on the flow rate through a given size pipe in pool applications (the pumps are no capable of moving TOO much water), but there are recommendations. Many pools only have 1.5" pipe (mine included) and can move plenty of water. Why do you think you "need to flow 50 gpm"?

    For a given pump, the flow rate is determined by the head loss of your entire plumbing system. If you use 2" instead of 1.5" that will reduce the head loss some and may increase the flow rate some ... assuming you do not have a very low head loss system already (meaning very short runs and few turns).
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    Re: 2" Piping....Do I have to have it

    •We have a pool that holds 22,000 gallons of water.
    •22,000 gallons × 2 turnovers/day = 44,000 gallons/day
    •We need to circulate 44,000 gallons of water every 24 hours
    •44,000 gallons ÷ 8 hours = 1833 gallons/hour
    •1833 gallons/hour ÷ 60 minutes = 31 gallons/minute (GPM)


    Isnt is better to turn the water over every 8 hrs though?
    30'x54" Round Vogue Simbio AG ~21,000 gallons
    Pentair Sand Dollar SD 60 w/ Pentair Dynamo 1.5 hp Pump
    Vinyl Uni-Bead 25mil Liner
    Perfect Bottom w/cove
    Taylor K-2005 & K-2006 Test Kit

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    JasonLion's Avatar
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    Re: 2" Piping....Do I have to have it

    That appears to be taken from a rule of thumb for designing plumbing systems designed from commercial pools, which has frequently been applied, inappropriately, to residential pools. There is no "need" to have two turnovers per day. In practice anything over roughly one turnover per day is fine. Nor are most of the numbers required to calculate that kind of formula practical to figure out in advance.

    Smaller pumps cost less to run and produce water just as sparkly and clean as larger pumps in the typical residential pool. Now if you have twenty friends over to swim every day that would be a different matter.
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    Mod Squad jblizzle's Avatar
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    Re: 2" Piping....Do I have to have it

    There is actually no required turn over rate. Many people are now running 2-speed or variable pumps on low rates for longer periods of time. Some recommendations here used to be 1-1.5 turn overs per day ... BUT, based on a study in Florida, that may not even be necessary.

    You really just need to run your pump long enough so that the water is filtered enough for you liking. The mixing of chemicals happens in a short period of time and normally seems that pump run time is driven by filtering the water. If you have very little debris/dust in your pool, you may be able to get by with a 3-5 hour run time per day ... which may not be 2 or even 1 turn over per day.
    Jason, TFP Moderator
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    Join Date
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    Re: 2" Piping....Do I have to have it

    Fair enough..Thx for the advice. I will stay with what I have from the pool store
    30'x54" Round Vogue Simbio AG ~21,000 gallons
    Pentair Sand Dollar SD 60 w/ Pentair Dynamo 1.5 hp Pump
    Vinyl Uni-Bead 25mil Liner
    Perfect Bottom w/cove
    Taylor K-2005 & K-2006 Test Kit

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