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Tweaked main line repair...

Discussion in 'Irrigation' started by PurpHaze, Oct 17, 2007.

  1. PurpHaze

    PurpHaze LawnSite Fanatic
    Messages: 5,496

    Leak on 4" main line at bell connection under concrete. Same site we've already made three repairs under concrete and still have another to go. (It's under a driveway used for food/other deliveries so plan is to keep spur off and make repairs during winter holidays.)

    Line was so tweaked that when I made the first cut it snapped 5" out of alignment vertically and several inches horizontally where it dives under a fire access lane. No way to use Dresser couplings because the amount of deflection was so great that I didn't want to chance it. All joints have been solvent weld so far so decided to just do the old 90/90 routine to get everything to line up again. Pressure loss from the 90s not important because spur only feeds smaller zones in front of school (was supposed to be looped main but never happened).

    We ended up having to open more concrete than originally expected because our Bobcat operator snagged/cracked some when making the original dig but it was no big deal and ended up being necessary in the end. The additional dig allowed us to straighten out the pipe on one end and to cut back both sides beyond actual bends in the pipe. As always... bigger is better when it comes to working with bigger pipe.

    Told the boss that I wouldn't be surprised if we end up having to repair every joint on the system main leading to the front before it's all said and done.

    Four Creeks Bus Lane Leak Repair 10-17-07 IV-01.jpg

    Four Creeks Bus Lane Leak Repair 10-17-07 IV-02.jpg

    Four Creeks Bus Lane Leak Repair 10-17-07 IV-03.jpg

    Four Creeks Bus Lane Leak Repair 10-17-07 IV-04.jpg

    Four Creeks Bus Lane Leak Repair 10-17-07 IV-05.jpg
  2. PurpHaze

    PurpHaze LawnSite Fanatic
    Messages: 5,496

    Last of the pics for today. We'll turn the spur back on tomorrow, check repairs and then turn it back off until December. Off to newfound interest of GeoCaching. :)

    Four Creeks Bus Lane Leak Repair 10-17-07 IV-06.jpg

    Four Creeks Bus Lane Leak Repair 10-17-07 IV-07.jpg

    Four Creeks Bus Lane Leak Repair 10-17-07 IV-08.jpg
  3. CAPT Stream Rotar

    CAPT Stream Rotar LawnSite Fanatic
    Messages: 6,193

    purp-as par the course thats an awsome reapir..I cant belive the pipe moved that much after you cut it...would you call that a "stressed pvc joint"? The 4 90's look great..neat as part the course....
    ::takes notes::

    what size is that pipe?

    Messages: 18,668

    Purp on 4 elbow repairs, which we do many of due to ground shift and roots, I'm curious to your install technique. The one problem with 4 ells that always bugs me is my inability to do a one third turn on the last glue. Also at some point two joints are going to have to be glued and pushed on at the same time unless you have lots of play. If that is Leo between you and me he is heading for a massive heart attack.
  5. PurpHaze

    PurpHaze LawnSite Fanatic
    Messages: 5,496

    It's 4" SCH 40 pipe and, yes... I'd say it was under a lot of stress both laterally and horizontally.
  6. PurpHaze

    PurpHaze LawnSite Fanatic
    Messages: 5,496

    I glue the stubs onto the first 90s then glue them onto the main line ends using a level to get them somewhat on the same geometrical plane so the last horseshoe part goes on easier.

    This is where confidence in your glue comes in. We use a good glue and plenty of it on both the pipe and inside of the fitting so we are positive we have good coverage. I'd rather be messy with extra glue than not have enough.

    We ran a string line between the stubs and eyeballed the best angles closest to right angles, marked our cuts with a marker and then just trusted that we'd done our homework. We had a small bit of play in each pipe so this also helped line them up better for the final horseshoe piece. We then cut the cross-pipe and dry fit it between the stubs to make sure we're neither too short or too long. We then glued the 90s onto the long piece and used level concrete to make sure the 90s were true to each other. Lots of glue slides them right on without binding and then we press and hold with a shovel or breaker bar to make sure they don't pop off.

    He is a big boy and has been trying to lose weight. Rides a bike to work every day but just can't seem to shed much. Course... he loves his beer too. :)
  7. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,592

    I always wonder about beer-lovers who ride bikes. Do they still have their driver's licenses?
  8. WalkGood

    WalkGood LawnSite Bronze Member
    Messages: 1,910

    If any pressure loss WAS important, what would you do differently?

    Would using 45*'s help in any way?
  9. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 50,592

    twenty-seven unions :)
  10. Mike Leary

    Mike Leary LawnSite Fanatic
    Messages: 23,158

    :laugh: :laugh: Nice repair Purp, all of our worst nightmares when you cut
    into the line & it goes "twang!". :cry:

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