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Thread: Pump Replacement Pipe Size.

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    Pump Replacement Pipe Size.

    My old pump has 2" pipe and 1.25 HP-



    New pump has 1 1/2" pipe 1.5 HP-



    Does any of this matter?

    THX
    18 x 36' Liner ~26,000g, 1 Skimmer (Supply)- 2 & 1 1/2" pipe, 3 Returns (jets), HEAD- ?, FILTER- Hayward 12002, 230v, SWG- AUTOPILOT DIG-220, PUMP- Challenger 346204 w/ USA MOTOR (rebuilt) SF 1.25/,02, CLEANER- Polaris 280- AO Smith 3/4hp., FEATURE- Hayward 1.5 HP Super Pump.

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    Mod Squad jblizzle's Avatar
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    Re: Pump Replacement Pipe Size.

    You mean the threads are smaller? Or the pipe fitting is smaller? Or both?

    Just use the proper adapter fittings get back up to the 2" pipe as needed.
    Jason, TFP Moderator
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    Re: Pump Replacement Pipe Size.

    Quote Originally Posted by jblizzle
    You mean the threads are smaller? Or the pipe fitting is smaller? Or both?

    Just use the proper adapter fittings get back up to the 2" pipe as needed.
    both.

    Will not the 1.5" have work harder. does this matter?
    18 x 36' Liner ~26,000g, 1 Skimmer (Supply)- 2 & 1 1/2" pipe, 3 Returns (jets), HEAD- ?, FILTER- Hayward 12002, 230v, SWG- AUTOPILOT DIG-220, PUMP- Challenger 346204 w/ USA MOTOR (rebuilt) SF 1.25/,02, CLEANER- Polaris 280- AO Smith 3/4hp., FEATURE- Hayward 1.5 HP Super Pump.

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    Mod Squad jblizzle's Avatar
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    Re: Pump Replacement Pipe Size.

    Does not matter. The pump would work through smaller pipe, just at a lower flow rate. Are you not able to find a 1.5" thread with a 2" pipe couple? Then you would not need adapters.

    With what you have, you likely need a short 1.5" pipe into that fitting, then a 1.5"/2" reducer on the other end of the pipe, then a 2" coupler to the reducer and the other end to the pipe.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Isaac-1's Avatar
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    Re: Pump Replacement Pipe Size.

    The restriction at your new 1.5 HP Hayward Superpump will will effect things some, but much of the reason for going with 2 inch pipe over 1.5 is the flow accumulated flow restriction down the length of the pipe.

    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: Pump Replacement Pipe Size.

    maybe because im new but I have posted 2 responses and they have not posted yet.
    18 x 36' Liner ~26,000g, 1 Skimmer (Supply)- 2 & 1 1/2" pipe, 3 Returns (jets), HEAD- ?, FILTER- Hayward 12002, 230v, SWG- AUTOPILOT DIG-220, PUMP- Challenger 346204 w/ USA MOTOR (rebuilt) SF 1.25/,02, CLEANER- Polaris 280- AO Smith 3/4hp., FEATURE- Hayward 1.5 HP Super Pump.

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    Re: Pump Replacement Pipe Size.

    Try again...

    More to my story-
    I'm adding a water feature and needed to buy an additional pump. There will be 3 water spouts on the feature but with a 5' rise and a run of ~ 40'. (I assume pretty low demand.)

    My thinking is since my existing pool pump in a little old (1.25HP) and maybe undersized I will use it for the feature and buy a new 1.5HP pump for the pool. I bought the Hayward Superpump but was surprised to see the 1.5" pipe sizes.

    My pool 18 x 36 ~ 26K gallon in GA....is a 1.25HP big enough?
    18 x 36' Liner ~26,000g, 1 Skimmer (Supply)- 2 & 1 1/2" pipe, 3 Returns (jets), HEAD- ?, FILTER- Hayward 12002, 230v, SWG- AUTOPILOT DIG-220, PUMP- Challenger 346204 w/ USA MOTOR (rebuilt) SF 1.25/,02, CLEANER- Polaris 280- AO Smith 3/4hp., FEATURE- Hayward 1.5 HP Super Pump.

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    Re: Pump Replacement Pipe Size.

    Quote Originally Posted by jblizzle
    Does not matter. The pump would work through smaller pipe, just at a lower flow rate. Are you not able to find a 1.5" thread with a 2" pipe couple? Then you would not need adapters.

    With what you have, you likely need a short 1.5" pipe into that fitting, then a 1.5"/2" reducer on the other end of the pipe, then a 2" coupler to the reducer and the other end to the pipe.
    Yes thanks...all very doable just wondering about the hydraulic dynamics......
    18 x 36' Liner ~26,000g, 1 Skimmer (Supply)- 2 & 1 1/2" pipe, 3 Returns (jets), HEAD- ?, FILTER- Hayward 12002, 230v, SWG- AUTOPILOT DIG-220, PUMP- Challenger 346204 w/ USA MOTOR (rebuilt) SF 1.25/,02, CLEANER- Polaris 280- AO Smith 3/4hp., FEATURE- Hayward 1.5 HP Super Pump.

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