Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 5 of 5

Thread: Hayward Super Pump Head Curve

  1. Back To Top    #1

    Hayward Super Pump Head Curve

    Did you find a pump curve for this motor used with a pump? Is there a way to find out if it came as original equipment on anything? I'd like to see a curve for it.
    13,300 gallon pool
    2"Ø suction with Kreepy Krauly (1994-1999 model)
    1-1/2"Ø discharge with 4 jets
    Pac-Fab Nautilus NS36 DE filter
    2-speed 3/4 Challenger High Head pump with Emerson EB980 motor and 35-5187 impeller
    Hasa 8-gallon liquidator with 1/2" tubing
    Researching an evil Ionizer with a K-1730 Taylor copper test kit
    Planning installation of Jandy levelor water leveler. (Need sensor.)

  2. Back To Top    #2
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,478

    Re: Century B973 as new motor for hayward superpump?

    The head curve of a wet end does not change with a change in motor. The only thing that is important when changing a motor is that it has a THP that is greater than or equal to the old motor THP and of course it is the correct frame.
    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

  3. Back To Top    #3

    Re: Century B973 as new motor for hayward superpump?

    Quote Originally Posted by mas985
    The head curve of a wet end does not change with a change in motor. The only thing that is important when changing a motor is that it has a THP that is greater than or equal to the old motor THP and of course it is the correct frame.
    So when a pump model shows four different curves, the difference in the curve is caused by the impeller difference, not the different motors used?
    13,300 gallon pool
    2"Ø suction with Kreepy Krauly (1994-1999 model)
    1-1/2"Ø discharge with 4 jets
    Pac-Fab Nautilus NS36 DE filter
    2-speed 3/4 Challenger High Head pump with Emerson EB980 motor and 35-5187 impeller
    Hasa 8-gallon liquidator with 1/2" tubing
    Researching an evil Ionizer with a K-1730 Taylor copper test kit
    Planning installation of Jandy levelor water leveler. (Need sensor.)

  4. Back To Top    #4
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Hayward Super Pump Head Curve

    That is mostly true. As long as the motor is at least as large as the impeller was designed to work with, the head curve will be determined by the impeller. If the motor is too small there will be problems and the curve won't really match. If the motor is too large the extra motor size is essentially ignored and the head curve follows the impeller.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  5. Back To Top    #5
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,478

    Re: Hayward Super Pump Head Curve

    Head curves are primarily determined by the operational RPM, impeller, diffuser and volute. If a pump motor is properly loaded or even slightly underloaded it will run at 3450 RPM on high speed and 1725 RPM on low speed. If the motor is overload (i.e. motor too small), slip can increase and thus RPM decrease which in turn can change the head curve.

    The wet end and motor are actually two separate machines which are connected by the motor shaft. The loading on the motor is determined by the wet end load and the wet end load is dependent on the speed of the impeller. So the motor is sized to the wet end load and if you have the same wet end, then when replacing the motor you want to make sure the new motor is rated to at least the same THP as the old motor. That way you are guarenteed the new motor will not be overloaded. It is ok to underload a motor but a motor cannot be overloaded without serious consequences.
    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

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •