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Thread: Plumbing pressure on new build

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    Plumbing pressure on new build

    The builder hooked up and pressurized all my equipment about 3 weeks ago. We started with 10 lbs of pressure, which it held for a period of time (days, maybe a week?), but it has since slowly dropped to about 8 lbs. Is it normal to slowly lose pressure over an extended time, or is this indicative of a small leak?
    20k white plaster with blue quartz, IntelliFlo VS, Quad DE 100
    1000 gal spa with natural stone waterfall
    Beach entry with 2 bubblers. Pool built Spring 2013

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    Isaac-1's Avatar
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    Re: Plumbing pressure on new build

    What type of filter do you have? We need more information on your pool, equipment, etc., but I would say in general if you had a leak that caused a 2 psi drop in back pressure you would likely be seeing lots of water loss (pool level going down, water everywhere, etc.)
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Re: Plumbing pressure on new build

    Pentair Quad DE 100, Intelliflo VS. It is a new build, though, and not yet plastered so no water, and no return fittings (returns still capped off) I don't think there's enough water in the system to notice a leak that would be small enough to drop the pressure from 10 to 8 over a couple weeks.
    20k white plaster with blue quartz, IntelliFlo VS, Quad DE 100
    1000 gal spa with natural stone waterfall
    Beach entry with 2 bubblers. Pool built Spring 2013

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    Isaac-1's Avatar
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    Re: Plumbing pressure on new build

    Ah, so this is a pressurization test, this confuses matters a bit more, if you will recall your basic high school physics courses and the gas pressure laws gases expand when temperature goes up and contract when it goes down, given the late season cool snap we had in the region last week, a drop in pressure seen then might be partly explained by the major drop in temperature. You also likely have some very slow leaks going on around the pump seals, etc.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
    I use and endorse TFtestKits TF-100 from http://tftestkits.net
    ~Remember TFP counts on your donations to keep this site ad free~

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    Re: Plumbing pressure on new build

    Yes, I recall something, don't know if it was Physics or not, but I was thinking that it was normal that you would lose a bit of pressure over time. Of course, I'm not certain that is accurate, hence the post. The gas line, however, has had a pressure test on it for a bit longer, and it has not lost any pressure at all.
    20k white plaster with blue quartz, IntelliFlo VS, Quad DE 100
    1000 gal spa with natural stone waterfall
    Beach entry with 2 bubblers. Pool built Spring 2013

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    mas985's Avatar
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    Re: Plumbing pressure on new build

    They should be testing at much higher than 10 PSI. Minimum it should be 35 PSI and preferably at 45 PSI.
    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

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    Re: Plumbing pressure on new build

    hmmm. Would you set it that high if you were going to leave it for an extended time? They tested once, when installed, then came back and released the pressure due to freezing temps. I don't know what pressure they tested at, at that time. I asked them to re-pressurize after it warmed up so I'd know if anything broke while work was being done around the pool.
    20k white plaster with blue quartz, IntelliFlo VS, Quad DE 100
    1000 gal spa with natural stone waterfall
    Beach entry with 2 bubblers. Pool built Spring 2013

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    mas985's Avatar
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    Re: Plumbing pressure on new build

    You definitely want to test at the higher pressure for as long as possible to show any weaknesses in the plumbing. The pressure will cycle some due to temperature but it should the read the same pressure at the same temperature over time.
    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

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