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Thread: Owner Builder needs advice--safe to proceed with some pressure drop

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    Owner Builder needs advice--safe to proceed with some pressure drop

    We started the patio last week and I halted work as I noticed the pressure on the pipes was dropping. No equipment is installed, the pipes are all brought into a manifold with a pressure gauge. We had some pretty large temperature swings, so I thought maybe some of the loss was due to it getting colder. This week the temperature is less dramatic and it looks like I'm seeing about a 1 PSI drop per day. I don't see any moisture at any of the pipes in the pool the skimmer plugs or any of the pipe fitting I can get access to. Here is the data I've taken:

    Last week, started at 20PSI. 7PSI drop from Thur to Monday; however, 30 degree drop in temperature
    20 PSI / 75? / Thur 12noon
    18 PSI / 65? / Fri 8PM
    17 PSI / ?? / Sat 5AM
    16 PSI / 63 / Sat 2PM
    16 PSI / 63 /Sat 4PM
    16 PSI / 62 / Sat 7PM
    15 PSI / 45 / Sun 8Am
    14 PSI / 47 / Sun 2:30PM
    14 PSI / 49 / Sun 4:30PM
    14 PSI / 48 / Sun 8PM
    13 PSI / 47 / Mon 8AM

    This week, started at 22PSI Mon, it is sitting just above 20PSI Wed night
    22 PSI / 61 / Mon 1:30PM
    22 PSI / 60 / Mon 8:15PM
    21 PSI / 42 / Tue 8:15AM
    21 PSI / 70 / Tue 5PM
    20 PSI / 50 / Wed 8AM
    20 PSI / 70 / Wed 2:30PM
    20 PSI / 66 / Wed 8PM


    Build thread - 15'x30' rectangular gunite pool; 17,400 gal; 5'x8' spa raised 12" w/ 8' spillover; 10'x6' Baja shelf; Two 18" tall columns w/ 27" water bowls; Light travertine coping w/ Light 2x4' split travertine ledgestone; Jules Rustic Blue tile; Pentair IC60 SWG; Pentair IntelliFlo 2 VST; Pentair SuperFlo 1HP; Pentair CC520 Cartridge filter; Pentair Easy Touch 8 w/ ScreenLogic2; Four Pentair GloBrite; Raypak 406 heater.

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    Re: Owner Builder needs advice--safe to proceed with some pressure drop

    New build and pressure drop sounds like an obstruction of dirt or construction debris in the pipes. The temp is not relevant. Is there no filter?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Owner Builder needs advice--safe to proceed with some pressure drop

    Quote Originally Posted by duraleigh View Post
    New build and pressure drop sounds like an obstruction of dirt or construction debris in the pipes. The temp is not relevant. Is there no filter?
    Can you say more and explain? The pipes aren't holding pressure. They are all capped. I would think any dirt in the pipes would not matter?
    Build thread - 15'x30' rectangular gunite pool; 17,400 gal; 5'x8' spa raised 12" w/ 8' spillover; 10'x6' Baja shelf; Two 18" tall columns w/ 27" water bowls; Light travertine coping w/ Light 2x4' split travertine ledgestone; Jules Rustic Blue tile; Pentair IC60 SWG; Pentair IntelliFlo 2 VST; Pentair SuperFlo 1HP; Pentair CC520 Cartridge filter; Pentair Easy Touch 8 w/ ScreenLogic2; Four Pentair GloBrite; Raypak 406 heater.

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    Re: Owner Builder needs advice--safe to proceed with some pressure drop

    Are you running the pump without the filter. I cannot understand how you are currently set up.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Owner Builder needs advice--safe to proceed with some pressure drop

    No equipment, just roughed in plumbing.
    IMG_3416.JPG


    Build thread - 15'x30' rectangular gunite pool; 17,400 gal; 5'x8' spa raised 12" w/ 8' spillover; 10'x6' Baja shelf; Two 18" tall columns w/ 27" water bowls; Light travertine coping w/ Light 2x4' split travertine ledgestone; Jules Rustic Blue tile; Pentair IC60 SWG; Pentair IntelliFlo 2 VST; Pentair SuperFlo 1HP; Pentair CC520 Cartridge filter; Pentair Easy Touch 8 w/ ScreenLogic2; Four Pentair GloBrite; Raypak 406 heater.

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    Re: Owner Builder needs advice--safe to proceed with some pressure drop

    Still confusing. If you have no equipment, how are you getting psi?.

    Have you capped the lines to do a pressure test?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Owner Builder needs advice--safe to proceed with some pressure drop

    Yes, he is in construction phase with all pipes capped to a manifold and a pressure value installed there for testing.
    18'x38' Rectangle (3'-8 1/2' deep w/ diving board) - 27K gal. w/ gray plaster
    Hayward equipment (cartridge filter, 2-speed pump, SWCG, automation) View Our Build
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    Re: Owner Builder needs advice--safe to proceed with some pressure drop

    have you tried a different gauge? Re-sealing the threads on the gauge? It sounds like the pipes are pressurized with water, not air? If a gas was used to pressurize the pipes, I think you might see a 1.5 psi drop due to the temperature differential, but I don't think it would be 7 or greater. I'd at least try the simple, mechanical things first, and gauges have been known to leak. I hope it's something that simple..
    2017 Build, 12.5K gal, pebbletec blue smurf, EcoStar VS pump (pool/spa), 2hp TriStar pump (water features), SwimClear 425 multi-cartridge filter, Hayward 400K heater, Turbocell-15 SWG, Pro-Logic Automation, LED lighting, Hayward suction side cleaner (model TBD), TF-100 Test Kit

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    Re: Owner Builder needs advice--safe to proceed with some pressure drop

    Quote Originally Posted by BeachHead View Post
    have you tried a different gauge? Re-sealing the threads on the gauge? It sounds like the pipes are pressurized with water, not air? If a gas was used to pressurize the pipes, I think you might see a 1.5 psi drop due to the temperature differential, but I don't think it would be 7 or greater. I'd at least try the simple, mechanical things first, and gauges have been known to leak. I hope it's something that simple..
    Good thought, I was thinking the same and I asked the plumber yesterday to swap the gauge...the one on there looks like it's been run over by a car. I wasn't home when he showed up, but it looks like he took the pressure up to 26 PSI, but did nothing else.


    Build thread - 15'x30' rectangular gunite pool; 17,400 gal; 5'x8' spa raised 12" w/ 8' spillover; 10'x6' Baja shelf; Two 18" tall columns w/ 27" water bowls; Light travertine coping w/ Light 2x4' split travertine ledgestone; Jules Rustic Blue tile; Pentair IC60 SWG; Pentair IntelliFlo 2 VST; Pentair SuperFlo 1HP; Pentair CC520 Cartridge filter; Pentair Easy Touch 8 w/ ScreenLogic2; Four Pentair GloBrite; Raypak 406 heater.

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