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Thread: Vacuum gauge installation, any tips ?

  1. Back To Top    #1

    Join Date
    Apr 2008
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    Indonesia
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    311

    Vacuum gauge installation, any tips ?

    Dear Seniors,

    Mar S ( Mas985 ) have indicated that I am having a severe suction dynamic head in my pool plumbing.
    I want to install a vacum gauge for this purpose in order to see what improvement I get for every troubleshooting method I will be doing and to track down the culprit.

    Is there any tips on good installation point ? The BW 300 flowmeter I just installed has installation do and dont, I am wondering if there is any installation tips for vaccum gauge that I should know of. I am also wondering if it will be easy for me to buy a PVC pipe adaptor where I can screw in the vacuum gauge.

    I am also hoping that since 1.13 * Hg is equal to the suction head loss, it will be a much more accurate tool than my flowmeter which is +-10% accurate and I got a 100GPM model.

    For those who is interested to know what I am troubleshooting, this is the data :

    2BHP Hayward Super Pump. 1.5" plumbing all around, which I am not happy esspecially for the suction.
    At 12 psi sand filter pressure almost very clean, I am getting 49GPM flow and that means I have 70 feet of Total Dynamic Head loss. So I have about 40 feet of head loss at suction, which Mark said it is so unusual.

    I tried yesterday to remove one of the two plunger type check valves, but my flowmeter hardly register any improvement.
    I think it is not accurate enough to let me view minor improvement, this is why I am looking at vacuum gauge.
    If I am assuming 40-47 feet is the suction head, as per Mark calculation. That means 40 divided by 1.13 and that is 35Hg...Holy Cow, as far as I know the common vacuum gauge only goes up to 30Hg.

    Any advice very appreciated. Thanks

    SPP
    35,000 GL pool. In Ground. Concrete with all white ceramic tiles. Outdoor but shaded.
    Approx 36 ft by 15 feet. 2HP Hayward Super Pump, Hayward Sand Filter with Zelbrite ( Zeolite ), Hayward Cartridge Filter, Aquamatic Silver+Copper Ionizer ( suspended use since Oct 2008 ), Prozone Ozonator, 2 gram/hr, Analog Flowmeter on pipe

    Back Up Pump & Filter on trolley, Pentair 1.5HP + Pentair Cartridge Filter, Slime Bag 1 micron Jumbo Size, downstream of Cartridge

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887
    One good place to hook up a vacuum gauge is one of the drain plugs on the pump. Drain plugs usually have some fairly common kind of threading and it should be possible to find an appropriate adapter.
    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

  3. Back To Top    #3

    Join Date
    Apr 2008
    Location
    Indonesia
    Posts
    311
    Hi Jason,

    My Hayward has two drain plugs. One is in front and the other is left very near the impeller.
    I will try to install somehwere there, I can machine the adaptor if needed.

    Thanks
    35,000 GL pool. In Ground. Concrete with all white ceramic tiles. Outdoor but shaded.
    Approx 36 ft by 15 feet. 2HP Hayward Super Pump, Hayward Sand Filter with Zelbrite ( Zeolite ), Hayward Cartridge Filter, Aquamatic Silver+Copper Ionizer ( suspended use since Oct 2008 ), Prozone Ozonator, 2 gram/hr, Analog Flowmeter on pipe

    Back Up Pump & Filter on trolley, Pentair 1.5HP + Pentair Cartridge Filter, Slime Bag 1 micron Jumbo Size, downstream of Cartridge

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