Become a TFP Supporter Pool Math Forum Rules Pool School
Page 1 of 2 12 LastLast
Results 1 to 20 of 21

Thread: PVC pipes keep separating, what is causing this?

  1. Back To Top    #1

    Join Date
    Jul 2016
    Location
    Westchester NY
    Posts
    20

    PVC pipes keep separating, what is causing this?

    I moved into a new home last year with a 44k gallon, inground pool with a SWG. I used TFP to manage it myself and had a few minor problems but it was generally great.

    This year I have had PVC pipes rip out / rip apart near the pump at least 6 times since Memorial Day.

    I thought it might be that the DE filter was getting too dirty overnight and increasing the pressure, but the last two times the pipes separated I had closed the filters to make sure pressure didn't get too high over night.

    Any idea what could be causing the problem? I am not doing anything all that different from last year but am having all sort of problems.



  2. Back To Top    #2

    Join Date
    Jun 2016
    Location
    Martinez, CA
    Posts
    207

    Re: PVC pipes keep separating, what is causing this?

    Can you post a few pics of the equipment pad so we can see how it is plumbed?
    18,000 gunite pool/spa combo. Pebble tec, iaqualink rs8, cl580 filter, aquapure 1400, 400k btu lx heater, 10 solar panels, jandy 1hp, 1 1/2hp, and 2hp stealth pumps for circ, spa, waterfall

  3. Back To Top    #3
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    9,200

    Re: PVC pipes keep separating, what is causing this?

    Is this plumbing work that you did yourself? Did you close valves to the filter with the pump still running?
    TFP Moderator
    Helpful links: TF Test Kits,TFP Pool School, PoolMath
    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
    Love TFP? Become a
    TFP Supporter!

  4. Back To Top    #4

    Join Date
    Jul 2016
    Location
    Westchester NY
    Posts
    20

    Re: PVC pipes keep separating, what is causing this?

    Yes. Here you go. And thank you




  5. Back To Top    #5

    Join Date
    Mar 2015
    Location
    Cantonment, FL (Pensacola Area)
    Posts
    380

    Re: PVC pipes keep separating, what is causing this?

    Where is it bursting? Looks like a lot of flex PVC there. Just a possibility but having used it often for whole room circulation behind a huge in-wall reef tank I know that flex tends to back out of fittings when cemented and needs to be held longer for it to set.
    Scott
    15,000 Gallons vinyl in-ground screen enclosed, Hayward Eco-star SP3400VSP, Hayward Aqua Logic PL-Plus, Hayward T-15 Salt Cell, Hayward S244T Sand Filter, Polaris 380 with booster pump, Hayward heat pump HP50HA. K-2006 kit.

  6. Back To Top    #6

    Join Date
    Jul 2016
    Location
    Westchester NY
    Posts
    20

    Re: PVC pipes keep separating, what is causing this?

    Quote Originally Posted by zea3 View Post
    Is this plumbing work that you did yourself? Did you close valves to the filter with the pump still running?
    The original work was done by the prior owner. A friend and I repaired the pipes.

    I never change the valve on the pump with it running (I learned that last summer).

    I have closed the ball valves on the return side with the pump running.





  7. Back To Top    #7

    Join Date
    Jul 2016
    Location
    Westchester NY
    Posts
    20

    Re: PVC pipes keep separating, what is causing this?

    Thanks NeedMoreSun, oddly the flex has never broken. I have had the pipes break once where water enters the pump and multiple times at either the spot where water exits the pump or the threaded joint above where water exits.





  8. Back To Top    #8

    Join Date
    Jun 2016
    Location
    Martinez, CA
    Posts
    207

    Re: PVC pipes keep separating, what is causing this?

    Are you saying the white plastic pipe that is screwed into the pump discharge port separates from the treads in the black pump housing?
    18,000 gunite pool/spa combo. Pebble tec, iaqualink rs8, cl580 filter, aquapure 1400, 400k btu lx heater, 10 solar panels, jandy 1hp, 1 1/2hp, and 2hp stealth pumps for circ, spa, waterfall

  9. Back To Top    #9

    Join Date
    Jul 2016
    Location
    Westchester NY
    Posts
    20

    Re: PVC pipes keep separating, what is causing this?

    That is what happened this time, but other times the pipes separated between that point and the valves





  10. Back To Top    #10
    Mod Squad JohnT's Avatar
    Join Date
    Apr 2007
    Location
    SW Indiana
    Posts
    9,089

    Re: PVC pipes keep separating, what is causing this?

    If that threaded adapter came out it probably points to a cracked pump housing from overtightening the fitting.

    Also looks like a rigid PVC joint isn't square.

    A properly made PVC joint isn't going to come apart without a lot of force. Far more than your pump can apply.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

  11. Back To Top    #11

    Join Date
    Jul 2016
    Location
    Westchester NY
    Posts
    20

    Re: PVC pipes keep separating, what is causing this?

    Thank you. I will check the pump housing. Will that be obvious upon inspection or could there be micro cracks I won't see?



  12. Back To Top    #12

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: PVC pipes keep separating, what is causing this?

    PVC joints must be made carefully and especially straight - not crooked. A crooked joint means the ends are not mated properly and will often separate.

    PVC is pretty easy when you see someone do it properly. If you don't. it is pretty easy to make some mistakes as you are gluing it together and I believe that is what you have done.

    I would check the pump for cracks where the water exits and if it's OK, I would redo that entire section.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  13. Back To Top    #13

    Join Date
    Jul 2016
    Location
    Westchester NY
    Posts
    20

    Re: PVC pipes keep separating, what is causing this?

    Thank you Duraleigh.

    And thank you to everyone else who has responded.

    I realized that this was user error on multiple fronts.

    The PVC work was subpar but (and incredibly embarrassingly) I also was setting the valves to closed when they should have been on re-circulate.

    Yikes. If Darwinism works My bloodline should run out pretty soon.



  14. Back To Top    #14

    Join Date
    Mar 2015
    Location
    Cantonment, FL (Pensacola Area)
    Posts
    380

    Re: PVC pipes keep separating, what is causing this?

    Just in case, I also see plenty with healthy doses of blue cement. Others I can see purple primer, but PVC cement was also used right?

    I hate asking what appears like a dumb question, but even having worked with PVC many times I somehow missed the cement on just one joint and ended up soaking myself after the pump was on
    Scott
    15,000 Gallons vinyl in-ground screen enclosed, Hayward Eco-star SP3400VSP, Hayward Aqua Logic PL-Plus, Hayward T-15 Salt Cell, Hayward S244T Sand Filter, Polaris 380 with booster pump, Hayward heat pump HP50HA. K-2006 kit.

  15. Back To Top    #15

    Join Date
    Jul 2016
    Location
    Westchester NY
    Posts
    20

    Re: PVC pipes keep separating, what is causing this?

    I believe so. I am the helper when it comes to this stuff.

    I will retry it tonight once water levels come back (and I finish self administering 100 lashes).

    I will check for housing cracks, make sure all joints are square and make sure I use primer and cement.

    Thanks again and sorry to be so stupid.



  16. Back To Top    #16

    Join Date
    Jun 2016
    Location
    Martinez, CA
    Posts
    207

    Re: PVC pipes keep separating, what is causing this?

    The white threaded section is NPT (nat'l pipe taper) threads. You want to make sure the pump doesnt use straight pipe threads as there wont be enough thread engagement to hold it together(normally they use NPT but not always).

    If the housing isnt cracked and you used just two wraps of teflon tape when last assembled, my bet is that the threads in the pump housing but are damaged from the pvc fitting separating and pulling out several times. If so, there are two options:

    1. Get a NPT tap and cut the threads a little deeper. You will need to ensure that you dont cut them too deep that the pvc fitting bottoms out without tightening up. 1 1/2" taps are probably pretty expensive to buy so maybe you can rent one?

    2. If there is some bits thread engagement left, you could glue the pvc fitting into the pump housing and see if it holds. You have a union above the pvc fitting so wouldnt be a problem removing pump for,servicing down the road.
    18,000 gunite pool/spa combo. Pebble tec, iaqualink rs8, cl580 filter, aquapure 1400, 400k btu lx heater, 10 solar panels, jandy 1hp, 1 1/2hp, and 2hp stealth pumps for circ, spa, waterfall

  17. Back To Top    #17

    Join Date
    Jul 2016
    Location
    Westchester NY
    Posts
    20

    Re: PVC pipes keep separating, what is causing this?

    Thanks



  18. Back To Top    #18

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: PVC pipes keep separating, what is causing this?

    Put me in the dumb crowd, too. My backwash pipe worked just fine for almost a year and then one day, simply separated at a coupler.

    My equipment is in a garage and you can imagine what 90 gpm did to the stuff we had on the floor.

    I was dumbfounded until I discovered I had not glued or primed it. Doh!
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  19. Back To Top    #19

    Join Date
    Jul 2014
    Location
    Sacramento, CA
    Posts
    240

    Re: PVC pipes keep separating, what is causing this?

    Do yourself a favor and use a different kind of union at the pump -- this is what I used on a Pentair IntelliFlo; I don't know whether there are similar designated for other brands or why these wouldn't work on any pump with the same thread size:

    Pump Unions for IntelliFlo - Threaded 2" w/O-Rings (2 Union Sets)

    Note the additional gasket on the part that threads into the pump (in addition to inside the union). That gasket seals against the pump without relying on the threads themselves to seal (no need for tape/dope/overtightening) -- especially when there's a discrepancy between tapered vs straight threading.
    21000gal IG plaster, Sacramento CA area (late 1950s/early 60s)
    Filter: Cartridge, Pentair CCP420 (2014)
    Main pump: Pentair IntelliFlo VS (2015)
    Boost pump: 3/4hp (2011), Polaris 280 cleaner (unknown age)

  20. Back To Top    #20

    Join Date
    May 2016
    Location
    Tallahassee
    Posts
    71

    Re: PVC pipes keep separating, what is causing this?

    Quote Originally Posted by NeedMoreSun View Post
    but even having worked with PVC many times I somehow missed the cement on just one joint and ended up soaking myself after the pump was on
    I missed two joints on my pad pumping I redid last month....One was kind to me and just had a small leak and when I looked it, I realized that the joint wasn't even glued. The other one (which was actually the first out of the two), separated with a nice 60 gpm all over my pump room for about 5-10 sec until I could shut it off

    Glad to know I'm not the only one...
    20k Gunite 16' x 32' , Hayward c7030 700 sq ft cartridge filter. Pentair Superflo 1hp 2sp pump, Intellichlor IC40 w/ Power Center SWG, Hayward GL-235 Solar Controller, (2) Digital GE Timers.

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •