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Thread: New plumbing test, what's a leak?

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    Join Date
    Aug 2008
    Location
    Maryland
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    New plumbing test, what's a leak?

    Building a new pool with lots of plumbing due to size and in-floor cleaner, and wondering what typical pressure leakdown during test is. Plumber pressurized to 20psi Thursday afternoon, 48 hours later one pump/cleaner set is down to 10psi, the other is at 16psi. 3 Pentair valves on the lower set, 2 on the higher, 2 Paramount cleaner valves on the higher psi side, 1 on the lower, an Intelliflo pump and a C&C+420 on each set.
    Does this seem like normal levels of leakdown?

    thanks,
    Vince
    52k gal/1300sqft white plaster wi spa, 2 Intelliflo 4x160, 2 C&C 420, Heat Siphon heat pump, PCC-2000, Intellitouch, CL&MA injection

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    Maryland
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    Re: New plumbing test, what's a leak?

    Should have mentioned, this is air-only, no water in plumbing yet.
    52k gal/1300sqft white plaster wi spa, 2 Intelliflo 4x160, 2 C&C 420, Heat Siphon heat pump, PCC-2000, Intellitouch, CL&MA injection

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    Sep 2007
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    Lafayette, Louisiana
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    344

    Re: New plumbing test, what's a leak?

    What are your temperature variations from when they pressured up to taking the readings? If they did not purge most of the air out of the system, temperature will make the test worthless and very difficult to detect leaks. I pressure tested my plumbing up to 50 psi. That's probably more than most plumbers will do, but I would go to at least 25. It's possible your inground cleaning system may be pushing that much pressure or a cleaning robot. I would not blow this test off...If you end up with a leak after the gunite is shot, it may be almost impossible to repair it.

    Here's an old thread with a discussion on the topic...

    pressure-testing-criteria-t6336.html
    Fortune favors the well prepared

    The build...
    viewtopic.php?t=3974
    Freeform 24' x 38' IG gunite. 3 1/2' to 8' deep. 28,500 gallons. AutoPilot Total Control SWCG. Pentair Intelliflo VF. Pentair CCP520 cartridge filter. Colorlogic LED lights. Tahoe Blue Diamond Brite. 1200 sq ft stamped concrete deck.
    More details as they happen...

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    In the Industry

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    Pittsburgh, PA
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    Re: New plumbing test, what's a leak?

    I dont do a lot of pressure testing testing and I usually use water so that I dont have to lug air around but I wouldnt be really comfortable with any drop in pressure. See if they pressure stabalizes, but make sure it stays consistent for atleast a day to be safe.
    Matthew
    Involved in the pool and spa industry
    Pittsburgh, PA

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    Aug 2008
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    Maryland
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    Re: New plumbing test, what's a leak?

    Thanks guys; while the rate of change is slowing, it seems clear there is some leakage, I just don't know what typical is from new valves and pumps/strainer covers. I think I will bring it up to 30 psi myself tomorrow and use up a few gallons of soapy water. There is probably close to a thousand feet of pipe in this system, so a 10 psi drop is a significant amount of air.
    52k gal/1300sqft white plaster wi spa, 2 Intelliflo 4x160, 2 C&C 420, Heat Siphon heat pump, PCC-2000, Intellitouch, CL&MA injection

  6. Back To Top    #6

    Join Date
    May 2007
    Location
    Rocklin, Ca
    Posts
    467

    Re: New plumbing test, what's a leak?

    My system was not presure tested with valve and pumps installed but those are all above ground so any leak there would be obvious and fixable after decking and gunite.

    My pressure was pumped up to my maximum water pressure of 45 psi. Once they had the system leak free it would fluctuate between 45-41 depending on the temperature. The key is that the fluctuation was very consistant.

    Do NOT let them tell you what you are seeing is normal.

    Let us know what happens.
    11000 Gals, Intelliflo, Sta-Rite Cartridge, Polaris 360

    Pool I built in my old house: my-new-pool-build-t4534.html

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