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Thread: How to fix crack in PVC

  1. #1
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    How to fix crack in PVC

    It would seem that I've got a little situation on my hands. I came home from lunch and noticed that the pump pad was wet, and traced the leak back to a crack in the pvc return right after the filter.

    This picture is to illustrate the area:


    And a closeup of the crack. I didn't have my camera on me, so the red line is an artist's rendition of the crack:


    It didn't seem like it was leaking real bad. The pump was on for a few hours and the pad wasn't even soaked. I turned the pump off until I can figure this out.

    What are your thoughts on the best way to fix it? I suppose the best solution would be to replace that section of the pipe. However, are there any mid-term or even short-term solutions that would work? Some sort of PVC epoxy or compound? Please let me know any sort of input you have.

    Thanks!

  2. #2
    Senior Member UnderWaterVanya's Avatar
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    Re: How to fix crack in PVC

    That is a PVC union joint - I wonder if the ring can come off (I'm not very literate in PVC yet). If so you could replace the ring. But looking at the pics - it looks to me like the pipes are under stress and bending - so this fix may require some additional work to get this to stop long term.
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
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  3. #3
    Mod Squad jblizzle's Avatar
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    Re: How to fix crack in PVC

    Yup. that is a union. It should just screw apart. Sounds like the crack is in the "nut" part which really has nothing to do with keeping a seal. But, as pointed out, there appears to be a bend. So, o-ring inside may not be making a seal ... possibly because the pipe bend cracking the "nut" portion.

    Unscrew it and take a look inside. You may need to replace that half of the union .. and while you are at it, make the vertical pipe a little longer to reduce stress.
    Jason, TFP Moderator
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  4. #4
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    Re: How to fix crack in PVC

    That pipe has been repaired between the union and the chlorinator and it doesn't fit right......causing the leak in the union.

    Cut those two couplings out where it was repaired and replace that section with a new one more carefully cut and the union will fit together nicely and the leak will be solved.
    Dave S.
    Site Owner 42k vinyl and concrete pool, 1.5hp pump, 140gpm filter, No SWG
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  5. #5
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    Re: How to fix crack in PVC

    Well, like I said, it's not that it's leaking from a joint or a coupling, there's a crack exactly where that red line is in the second picture. It's cracked down the side of the union. I'm guessing this happened because the back side of the plumbing isn't really supported by anything and flexes and torques every time the pump comes on. Over time I'm guessing it got brittle and cracked when the pump came on.

    It looks like those unions are pvc glued on. So, I'm guessing the best way to fix this is to cut off the union at either side, and then couple in another piece of pvc?

  6. #6
    Mod Squad jblizzle's Avatar
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    Re: How to fix crack in PVC

    You want to cut the vertical pipe below the added coupler and replace from there all the way up and over to the union. The crack is just in the screw part, so you may actually not have to replace that ...but while you are at it, may not hurt. If you find the same union, you will not have to replace the half that is attached to the filter.
    Jason, TFP Moderator
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  7. #7
    Senior Member dmanb2b's Avatar
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    Re: How to fix crack in PVC

    Quote Originally Posted by jblizzle
    You want to cut the vertical pipe below the added coupler and replace from there all the way up and over to the union. .
    Ditto...the 90 deg elbow coming off of that vertical pipe is not high enough and is putting stress on the union.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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  8. #8
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    Re: How to fix crack in PVC

    Since you're replacing piping, I'd cut that "loop-the-loop" out at the tablet feeder and straighten that out as well.
    Dave J. TFP Moderator
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  9. #9
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    Re: How to fix crack in PVC

    Thank you everyone for your input, and point taken on straightening out all the poorly laid out plumbing. Maybe I'll take care of that when I have a spa heater installed.

    However, for the time being, I lightly sanded the area with 80 grit, cleaned it with acetone and generously applied JB Weld "Waterweld". So far, it looks like it's holding like a champ! Additionally, I braced up that looped section in the back which greatly reduces stress across that arm on the top, so I think this will at least get me by for a while.

    On a side note, do you guys ever have nightmares about coming home from work to find that some critical pipe has split and it drained your entire pool into your back yard?

  10. #10
    Mod Squad Bama Rambler's Avatar
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    Re: How to fix crack in PVC

    I consider the possibility of something breaking and draining the pool a small exposure. Even if something did happen to the pool it's a small thing to fix it, and not worth worrying too much about.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  11. #11
    Senior Member UnderWaterVanya's Avatar
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    Re: How to fix crack in PVC

    Quote Originally Posted by lichen
    On a side note, do you guys ever have nightmares about coming home from work to find that some critical pipe has split and it drained your entire pool into your back yard?
    No... not before, but now I will!
    Inlaws Pool Boy since June 14th 2012, Pool built ~ 2003, In-Ground, 16'x32'
    13500 gal, Vinyl Liner, Fiberglass Slide, TF-100 Test Kit, Hayward 210T
    sand filter, A.O. Smith 1.5HP main pump motor (C48L2N134C1),
    Hayward SuperPump (model ?), Polaris 380 & PB4 Booster Pump

  12. #12
    Mod Squad jblizzle's Avatar
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    Re: How to fix crack in PVC

    Quote Originally Posted by lichen
    On a side note, do you guys ever have nightmares about coming home from work to find that some critical pipe has split and it drained your entire pool into your back yard?
    Happened to me ... Only it was not a pipe, the lower half of my filter split and drained the pool

    Always had reasonable pressure, the split was on the shaded side, and it was only a few years old. Manufacturer sent me a new filter case.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, Dolphin Diagnostic Robotic Cleaner, TF-100 test kit w/ SpeedStir
    Gone: Hayward RS1500 pump, undersized DIY solar heater, Dolphin Dynamic Robotic Cleaner
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