Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 11 of 11

Thread: Plumbing efficiency

  1. Back To Top    #1

    Join Date
    May 2012
    Location
    South Florida
    Posts
    36

    Plumbing efficiency

    Here is view of current inlets. From left to right: Main 2", Skimmer 1.5", Vacuum 1.5".
    I'm in the process of putting in new motor and am wondering about the current plumbing setup. Currently I get cavitation if I shut off main to use just skimmer or vacuum lines.



    [attachment=0:1fvxzlix]2012-05-31_13-25-31_440.jpg[/attachment:1fvxzlix]
    Attached Images Attached Images
    IG ~14,000 Gal
    Pentair clean n clear Cartridge 100g/
    SWG Aquapure 1400
    Hayward XL Cleaner
    Premix Marbletite Freestone series
    1.5Hp 2 speed
    TF-100

  2. Back To Top    #2
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,487

    Re: Plumbing efficiency

    Cavitation or air bubbles in the pump basket? They are not the same thing. Cavitation bubbles can only exist in the impeller inlet and not the pump basket. If you are seeing air in the pump basket, that is likely due to an air leak caused by the high suction head. Do you need to shut off the main line completely to get the vacuum to work?
    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

    Join Date
    May 2012
    Location
    South Florida
    Posts
    36

    Re: Plumbing efficiency

    Air is in basket when main closed. I usually need to turn off main to vacuum. There is no air in basket as long as main is open. I dont see any obvious leaks. Is the smaller jandy valve a concern.
    IG ~14,000 Gal
    Pentair clean n clear Cartridge 100g/
    SWG Aquapure 1400
    Hayward XL Cleaner
    Premix Marbletite Freestone series
    1.5Hp 2 speed
    TF-100

  4. Back To Top    #4
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Plumbing efficiency

    That sounds like an air leak in the skimmer or vacuum line.
    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
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  5. Back To Top    #5
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,487

    Re: Plumbing efficiency

    You can also have leaks in the pump basket, drain plugs or any valves. Use pool lube on the pump lid gasket and see if that helps. Note too that it is difficult to "see" and air leak. Air can leak in but water may not leak out.
    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

  6. Back To Top    #6

    Join Date
    May 2012
    Location
    South Florida
    Posts
    36

    Re: Plumbing efficiency

    How do I find out where the leak is. I get the same action in the basket with either of the skimmer or vacuum lines.
    IG ~14,000 Gal
    Pentair clean n clear Cartridge 100g/
    SWG Aquapure 1400
    Hayward XL Cleaner
    Premix Marbletite Freestone series
    1.5Hp 2 speed
    TF-100

  7. Back To Top    #7
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Plumbing efficiency

    If you run a water hose over each joint, you may be able to find the leak if the air in the pump basket goes away.

    First check all your pump fittings (lid, and drains). The pump is pulling harder when through the smaller pipe, so that could be enough to pull air in by the pump only when the pump is "working harder".

    Since it happens for both the skimmer and vac, that could point to the smaller valve leaking as well.
    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
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  8. Back To Top    #8

    Join Date
    May 2012
    Location
    South Florida
    Posts
    36

    Re: Plumbing efficiency

    Thanks, I'll work on it and let you know.
    IG ~14,000 Gal
    Pentair clean n clear Cartridge 100g/
    SWG Aquapure 1400
    Hayward XL Cleaner
    Premix Marbletite Freestone series
    1.5Hp 2 speed
    TF-100

  9. Back To Top    #9

    Join Date
    May 2012
    Location
    South Florida
    Posts
    36

    Re: Plumbing efficiency

    Clarification:

    It's not so much that I'm getting air in basket as it's the water level immediately dropping in the basket.
    IG ~14,000 Gal
    Pentair clean n clear Cartridge 100g/
    SWG Aquapure 1400
    Hayward XL Cleaner
    Premix Marbletite Freestone series
    1.5Hp 2 speed
    TF-100

  10. Back To Top    #10
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Plumbing efficiency

    Well air still had to get in there for the water level to drop right?

    Do you get good flow through just the skimmer? Do you get good flow through just the vac? Does the water in the pump look the same when you switch from Main to Skimmer and from Main to Vac?
    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
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

  11. Back To Top    #11

    Join Date
    May 2012
    Location
    South Florida
    Posts
    36

    Re: Plumbing efficiency

    The water does look the same when switching to main to skimmer and main to vac. New motor will be on tomorrow, but I do get good flow through just the skimmer. I did notice drain on basket was not that tight. I will put some new teflon tape on and fix that. Thanks for the help!
    IG ~14,000 Gal
    Pentair clean n clear Cartridge 100g/
    SWG Aquapure 1400
    Hayward XL Cleaner
    Premix Marbletite Freestone series
    1.5Hp 2 speed
    TF-100

Posting Permissions

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