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Thread: Rise in pressure after adding "T"

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    Mod Squad tim5055's Avatar
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    Rise in pressure after adding "T"

    Well, I finally got around to moving the injection point for my Stenner from the pump strainer basket to it's own point on the return line to the pool. Due to the way the plumping was originally set up I did not have sufficient "play" in the return line to just cut and add a "T". So, I added two unions with a "T" between them. After the glue dried and I was able to start the system back up I noticed that my system pressure had risen form my normal 10psi to 12psi. Just to be sure I backwashed and checked again, but it was still at 12psi.

    Nothing else changed, so I can only attribute the increase in pressure to this addition. Does it seem reasonable?
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    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Rise in pressure after adding "T"

    It seems reasonable to me based on my experience with replacing a gas heater. Old heater had in/out ports on the top, new heater on the bottom. The resulting change in plumbing caused and immediate 10psi in my normal pressure that has caused no apparent problems. So, I think that your 2psi rise seems reasonable.
    Walnut Creek, CA. 18k gallon Pebble Sheen + 1.5k gallon IG spa, 1.5hp whisperflo main pump, Pentair clean and clear 420, Intellichlor IC20, Polaris 360 w/booster,Jandy lite 2 natural gas, plus solar with Heliomatic 5000 controller and 3/4 hp booster

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    Mod Squad tim5055's Avatar
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    Re: Rise in pressure after adding "T"

    Quote Originally Posted by btolley View Post
    It seems reasonable to me based on my experience with replacing a gas heater. Old heater had in/out ports on the top, new heater on the bottom. The resulting change in plumbing caused and immediate 10psi in my normal pressure that has caused no apparent problems. So, I think that your 2psi rise seems reasonable.
    Thanks!! I just had no historical basis to figure it was normal or not. I figured it would go up form the disruption of the water flow thru what was previously a straight pipe, but wasn't sure.
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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