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Thread: Leak around pump to pipe fitting

  1. #1
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    Leak around pump to pipe fitting

    My pump is leaking where the pipe exits the housing on the top of the pump. This is the outflow pressure pipe. The leak is around the joint between the pump and PVC pipe. The pipe section is very short and cutting it out and replacing it would be difficult. Also it looks like it may be glued into the pump so not even sure if I could get it out easily. Is there something I can use to seal this joint without disassembling the pipe fitting? I've seen Plast-Aid mentioned on other posts - is this a good choice for the repair?
    ___________________________________
    42'x18' In-ground gunite diving pool with raised spa and waterfall.
    Hayward pumps, 400,000BTU propane heater, cartridge filter
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  2. #2
    Mod Squad Bama Rambler's Avatar
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    Re: Leak around pump to pipe fitting

    The best repair is to remove the fitting and reinstall one in it's place. Reworking the plumbing is not difficult even if you have to replace a few fittings. Post a pic of the equipment and we can help you figure out the best plan of attack.
    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.

  3. #3
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    Re: Leak around pump to pipe fitting

    Here are the pictures, click the thumbnails to enlarge. The leak is at the junction of the gray pipe and the pump housing. Is the outlet of the pump threaded?




    ___________________________________
    42'x18' In-ground gunite diving pool with raised spa and waterfall.
    Hayward pumps, 400,000BTU propane heater, cartridge filter
    BBB
    Polaris 280 Cleaner

  4. #4
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    Re: Leak around pump to pipe fitting

    Any chance of a pic of the in fluent (front) side of the pump? The pics are great I'm trying to see if there is enough room, or a way, to install the union you need on the effluent side

    One more pic and we'll figure out a way to solve this leak, in the best way possible
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

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  5. #5
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    Re: Leak around pump to pipe fitting

    Sure I can take more pics but it'll be tomorrow evening before I can post them. Thanks for the help.
    ___________________________________
    42'x18' In-ground gunite diving pool with raised spa and waterfall.
    Hayward pumps, 400,000BTU propane heater, cartridge filter
    BBB
    Polaris 280 Cleaner

  6. #6
    Senior Member 4JawChuck's Avatar
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    Re: Leak around pump to pipe fitting

    If the leak is at the threaded connection to the pump with the grey tube as shown here...



    ...just cut out a section of pipe approx halfway and put in a union, there should have been a union there anyway and you have plenty of material to glue one in.

    Here is what some of them look like, make sure the o-ring is in there when you purchase it...they seem to go missing in the plumbing isle a lot.





    You might even have room for a union ball valve which might make life easier when your cleaning the basket;



    To figure out how much material to cut out of the pipe measure across the pipe stops inside the union and add 1/8", this will give you room while the glue sets up and prevent straining the rest of the pipe in case it was strained when it was originally glued. Scuff the plastic pipe with sandpaper or scotchbrite before applying the glue to remove any mold release agent and get a clean surface, do the union/ball valve interior part too.

    Your leak is likely from the threaded connection at the pump and it looks like pipe dope was used as a sealant which doesn't work on plastic pipe all that well, I would use IPS WELD-ON All Seal. When you cut the pipe and get it unthreaded from the pump check the pipe threaded section carefully (check the pump housing too it might be cracked!), it may be damaged and require a new section...you can buy lengths pre-threaded from most hardware stores and you can cut to length as required. When re-installing turn in hand tight and then 1/2 -1 turn further with a strap wrench...don't overtighten (thats likely how it started leaking in the first place). You can try using teflon tape but use at least 4-6 wraps, it doesn't always work on plastic pipe so beware (it usually depends on if the threads were cut or molded, molded doesn't always seal because of the parting line on the thread).
    55 Kilolitre in-ground 18'X36' vinyl lined kidney shape, 1HP pump, Jacuzzi 250lb sand filter, RayPak Delta T 200K BTU natural gas heater. New PoolWerks "Blue Diffusion" liner on May 26th-2011
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  7. #7
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    Re: Leak around pump to pipe fitting

    4jawChuck;

    Thank you for the advice - I really didn't think I had enough room to do anything like that. Guess I need to go the plumbing store and see what they have. You're right - the leak is where you suspect and now that you mention it it does look like pipe dope was used to seal the threads.

    I didn't get home till after dark tonight - so didn't get to take any more pics.
    ___________________________________
    42'x18' In-ground gunite diving pool with raised spa and waterfall.
    Hayward pumps, 400,000BTU propane heater, cartridge filter
    BBB
    Polaris 280 Cleaner

  8. #8
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    Re: Leak around pump to pipe fitting

    Finally got around to fixing this last weekend. I cut the pipe, measured and put in a union just like 4jawchuck suggested. I barely had room for it, but it did fit. Fortunately everything lined up perfectly. I reused the both ends of the existing pipe and sealed the threads with Rectorseal #5. http://www.rectorseal.com/index.php?...product_id=212 Reassembled and even let the sealant cure for 72 hours even though it isn't required. When I turned the pump on I still had a leak, around the threads of the pipe, not very much but nevertheless still a leak.

    I couldn't find the suggested IPS weld on all seal, but I could have had other formulations of Rectorseal. I'm assuming the pipe is all PVC so it should've worked. Should the threads on plastic pipe be tapered like metal pipe? These seemed to bottom out in the pump before they got tight.


    Ideas?
    ___________________________________
    42'x18' In-ground gunite diving pool with raised spa and waterfall.
    Hayward pumps, 400,000BTU propane heater, cartridge filter
    BBB
    Polaris 280 Cleaner

  9. #9
    Mod Squad Bama Rambler's Avatar
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    Re: Leak around pump to pipe fitting

    If the nipple bottomed out before it got tight you might need to use several wraps of t-tape or clean it real well and use silicone sealant on it.
    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.

  10. #10
    Senior Member dmanb2b's Avatar
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    Re: Leak around pump to pipe fitting

    use white ptfe pipe dope instead, applied liberally

    http://www.rectorseal.com/index.php?sit ... uct_id=221
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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  11. #11
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    Re: Leak around pump to pipe fitting

    Be cautious on your choice of thread sealants. Rectorseal products are widely known as troublesome on anything except metal pipes & pvc. The pump housing is not made of PVC. These sealants can be harmful to the pump housing, and are very harmful to ABS plastic commonly used in backwash valves, etc.
    APSP CST Certified
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  12. #12
    Senior Member dmanb2b's Avatar
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    Re: Leak around pump to pipe fitting

    Ranger,

    The product I referenced from rectorseal spec sheet states the following "PURE WHITE can be used on a variety of metal and plastic piping including iron, galvanized steel, stainless steel, brass, copper, aluminum, polyethylene, reinforced fiberglass, PVC, CPVC, and ABS."

    Not sure about the product the OP used though...good point However if you feel what I referenced is contrary to the rectorseal statement for PURE WHIT, and you have proof of the widely known issue with ABS, I would suggest you contact the manufacturer.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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