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Thread: flex pvc @ equipment pad

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    flex pvc @ equipment pad

    Hi, long time lurker here ( I've learned a lot ) thanks in advance for the input. I have a problem with a multiport valve cracking ( Hayward variflow SP0715XR50 ). I'm on my third one. They keep cracking @ the threaded input ( first one also began leaking @ output and at the case near the waste ). I'm thinking of replacing input from pump with flex. Any thoughts?
    Damon
    New owner, first pool,30+ yr old plaster/gunite,15k gal. White quartz plaster (NEW 5/5/13!)Hayward tristar variable pump Hayward pro grid D.E. Hayward h heater LED color lights.

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    JasonLion's Avatar
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    Re: flex pvc @ equipment pad

    Is the main valve shaded from direct sunlight? They tend to get brittle if they get too much UV. Painting everything with a UV blocking paint also helps, shaded or not.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: flex pvc @ equipment pad

    Should be fine. Although not sure why that would be the problem.
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    Re: flex pvc @ equipment pad

    Are you putting any thing on the PVC threads to seal them?
    Josh Ulfers - josh@saltpoolguys.com - 888-725-8766
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    Re: flex pvc @ equipment pad

    @ jason, full shade. Im talking new valves, 1 or 2 days and im springing a leak.

    @ Josh, rector seal

    thx guys
    Damon
    New owner, first pool,30+ yr old plaster/gunite,15k gal. White quartz plaster (NEW 5/5/13!)Hayward tristar variable pump Hayward pro grid D.E. Hayward h heater LED color lights.

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    Re: flex pvc @ equipment pad

    • Don't use teflon tape as it is just putting more pressure on the fittings and port valve (use teflon paste, or other liquid thread sealant)
    • Using flex may help with vibrations or jolting coming from water pressure
    • You can also put a large SS pipe clamp over the female inlet of the port valve and tighten it down, this will prevent the fitting on the port valve from expanding and cracking as well when installing the plumbing. Install this clamp before plumbing
    -Kevin
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    Re: flex pvc @ equipment pad

    @ Josh, rector seal
    This could be it. Does the can say anything about use on ABS plastic?

    I would water PROOF silicone on the threads.
    Josh Ulfers - josh@saltpoolguys.com - 888-725-8766
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    Re: flex pvc @ equipment pad

    Quote Originally Posted by X-PertPool View Post
    • Don't use teflon tape as it is just putting more pressure on the fittings and port valve (use teflon paste, or other liquid thread sealant)
    • Using flex may help with vibrations or jolting coming from water pressure
    • You can also put a large SS pipe clamp over the female inlet of the port valve and tighten it down, this will prevent the fitting on the port valve from expanding and cracking as well when installing the plumbing. Install this clamp before plumbing
    Going to have to disagree here: Teflon tape IS recommended on PVC as MOST thread sealants are NOT recommended for PVC plastic. Teflon paste is good as well. You have to read the label on the thread sealants to make sure it is for use with PVC.
    20X36 IG vinyl (18,000 gal), 3 sheer descents, Max-Flo 1.5hp VS 2300, Aquarite T15 SWG, C3030 filter, 250,000 BTU heater, Sharkvac XL (Hayward equip)

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    Re: flex pvc @ equipment pad

    Quote Originally Posted by JoshU View Post
    This could be it. Does the can say anything about use on ABS plastic?

    I would water PROOF silicone on the threads.
    PRODUCT OVERVIEW

    Rectorseal T Plus 2 pipe thread sealant is a non-setting, multi-purpose compound which contains PTFE, plus synthetic fibers to create a stronger seal. Recommended for use on threaded galvanized steel, iron, brass, copper, aluminum, stainless steel, polyethylene, fiberglass reinforced, PVC, CPVC and ABS pipe. T Plus 2 may be pressurized immediately following application.

    •Teflon-enriched synthetic fibers create a strong seal
    •Compatible with metal and plastic pipe
    •Suitable for use in potable water systems and uses with a wide variety of other gases and liquids
    •Allows for immediate pressurization
    •Does not harden
    •Brush applicator lid
    20X36 IG vinyl (18,000 gal), 3 sheer descents, Max-Flo 1.5hp VS 2300, Aquarite T15 SWG, C3030 filter, 250,000 BTU heater, Sharkvac XL (Hayward equip)

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    Re: flex pvc @ equipment pad

    I would never use teflon tape for threaded joint over 1" in diameter. Teflon paste is more reliable for larger connections.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: flex pvc @ equipment pad

    Quote Originally Posted by Donny View Post
    PRODUCT OVERVIEW

    Rectorseal T Plus 2 pipe thread sealant is a non-setting, multi-purpose compound which contains PTFE, plus synthetic fibers to create a stronger seal. Recommended for use on threaded galvanized steel, iron, brass, copper, aluminum, stainless steel, polyethylene, fiberglass reinforced, PVC, CPVC and ABS pipe. T Plus 2 may be pressurized immediately following application.
    I saw that too. However it appears they make several different types of Rectorseal. Pretty much any time I've had brand new multi-port valves with cracked ports is a result of the thread sealant or could just be simple over tightening. I don't think you can ever go wrong with just using a very good grade water PROOF (not water resistant) silicone. We used it on thousands and thousands of installations over the years.
    Josh Ulfers - josh@saltpoolguys.com - 888-725-8766
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    Re: flex pvc @ equipment pad

    Thanks for the input guys. Rectorseal 5 (yellow stuff) does in fact say NOT for use with abs. Im not sure if I overlooked that or if I thought I had cpvc. I cant find what if any effect it has on abs, but I cant imagine it would weaken it, at least not so quickly.
    I recently replumbed pool pad and moved equipment around so I'm thinking it's an alignment issue. Or maybe these valves are junk!?
    I'll probably work on it this weekend and post back.

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    Re: flex pvc @ equipment pad

    I cant find what if any effect it has on abs, but I cant imagine it would weaken it, at least not so quickly.
    The oils used in pipe dope can weaken and crack ABS plastic within a few days of application. I've seen it personally happen dozens of times. I don't know how the Rectorseal product in question compares to pipe dope but I'm just saying that it could have the same sort of oils, etc. Since the bottle says not use on ABS I would have to imagine the Rectroseal used has the same tendency to cause stress cracks in ABS.

    I thought I had cpvc
    The valve is probably ABS while the plumbing is probably PVC. Did the pipe and/or PVC fittings crack too?
    Josh Ulfers - josh@saltpoolguys.com - 888-725-8766
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    Re: flex pvc @ equipment pad

    The discussion for pipe dope vs. teflon tape vs kind of pipe dope will go on interminably, I think.

    I will add that the most common issue I read about is over tightening the joint causing the plastic to crack. If you break more than one seal, that would be the very first thing I would address.

    My experience with all plastic joints (after pipe seal or thread) is somewhere around very hand tight + maybe another 1/2 turn with a wrench but I seldom use all of that 1/2 turn and I get about a 98% or better success rate
    Dave S.
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    Re: flex pvc @ equipment pad

    Dave s
    I thought that I had cracked the original valve ( 4 yrs old maybe ) by over tightening it, so I purposely only hand tightened replacement(s)

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    Re: flex pvc @ equipment pad

    josh pvc is fine, maybe ill try silicone. is there a brand I should look for?


    here is my attempt at uploading pics
    IMAG0218.jpg
    IMAG0219.jpgIMAG0220.jpg
    Damon
    New owner, first pool,30+ yr old plaster/gunite,15k gal. White quartz plaster (NEW 5/5/13!)Hayward tristar variable pump Hayward pro grid D.E. Hayward h heater LED color lights.

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    Re: flex pvc @ equipment pad

    josh pvc is fine, maybe ill try silicone. is there a brand I should look for?
    I've used "Boss" and "GE" many times without any issues. Some silicones may say water resistant however you'll want to it be water proof. I can't stress that part enough. Based on your photos it really does look like either the sealant or over tightening caused the crack.
    Josh Ulfers - josh@saltpoolguys.com - 888-725-8766
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    Re: flex pvc @ equipment pad

    New valve and silicone in. Waiting for it to cure. Cross your fingers. Thanks for all the input everybody.
    Damon
    New owner, first pool,30+ yr old plaster/gunite,15k gal. White quartz plaster (NEW 5/5/13!)Hayward tristar variable pump Hayward pro grid D.E. Hayward h heater LED color lights.

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    Re: flex pvc @ equipment pad

    Those valves can't take much stress. They crack way too easily at even low to moderate overtightening.

    A good silicone to use is one rated as suitable for aquariums.

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    Re: flex pvc @ equipment pad

    I have used Rector Seal for many, many years on larger PVC and it never caused any problem I could see. I seriously doubt it would have any negative effect on ABS either.
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