Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: pump flow rate

  1. Back To Top    #1

    pump flow rate

    hey guys my pool has 2hp haywood pump it has a chart in the manual regarding flow rates according to pipe size, now i hav 2 inch pipe to the pump, out the pump converts down to 1 1//2 pipe entering the filter and back out and thru my swg converting back to 2 inch pipe for return to pool. my question is what pipe size on the flow chart should i go by 2in or 1 1/2 inch.
    12,500 IG Concrete Pebble Surface
    1 HP pump with cartridge Filter - Electric Heater
    4 Jets - Main Drain
    SW Florida

  2. Back To Top    #2

    Join Date
    May 2007
    Location
    South Central NJ
    Posts
    3,192

    Re: pump flow rate

    2 HP pumps and 1.5" plumbing don't mix well. It will restrict the pump creating extra head loss. The 1.5" chart is what the flow will be.

    Scott
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: pump flow rate

    There is much more to determining the flow rate than just knowing the pipe diameter. A calculator that uses only the pipe diameter and pump size won't be especially accurate. If it also uses the pipe length then it could be in the ball park, but there are still many many other factors that affect the flow rate.

    What matters for flow rate is the average pipe diameter, not the smallest pipe diameter. If the great majority of the piping run is 2" then you effectively have 2" plumbing everywhere.
    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

  4. Back To Top    #4
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    9,905

    Re: pump flow rate

    Normally, the flow rates listed in a pump manual are just pipe velocity recommendations and nothing more. What are you trying to do?
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

  5. Back To Top    #5

    Re: pump flow rate

    got my salt level too high trying to determine how long i need to run them pump to remove the needed amount of water. followed what i thought was the right amt of salt to put in at fresh start up but i am up to 3900-4000 ppm. any dangers of leaving it thaT HIGH
    12,500 IG Concrete Pebble Surface
    1 HP pump with cartridge Filter - Electric Heater
    4 Jets - Main Drain
    SW Florida

  6. Back To Top    #6
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    9,905

    Re: pump flow rate

    Usually a SWG will shut off on it's own if the salt is too high. If it doesn't complain, then it should be ok. What model SWG do you have?
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

  7. Back To Top    #7

    Re: pump flow rate

    i have goldline model
    12,500 IG Concrete Pebble Surface
    1 HP pump with cartridge Filter - Electric Heater
    4 Jets - Main Drain
    SW Florida

  8. Back To Top    #8
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    9,905

    Re: pump flow rate

    That unit should shut off if the salt level is too high. So as long as you don't get an error, the level is fine.

    Note too that salt level strips tend to read high so if you are going by that, I would see if the unit says the salt level is too high.
    Mark
    Hydraulics 101; Pump Ed 101; Pump and Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, 1/2 HP 2sp pump, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater, ThePoolCleaner

Posting Permissions

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