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  1. #1
    Join Date
    Dec 2009
    Location
    Los Angeles, CA
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    45

    Repairing leak on U-tube junction



    In the picture above there's a leak on the bottom u-tube on the left connection right where it joins the main liquid line. What is the most efficient way to repair that leak? Can it just be rebrazed or do I have to replace the piping on that section?

  2. #2
    Join Date
    Jan 2010
    Posts
    6,229
    Just clean it up good. I like using a small wire wheel on a drill. Of course clear system and direct your flame away from other welds. Get in and get out with the heat.

  3. #3
    Join Date
    Oct 2004
    Location
    Metro ATL
    Posts
    454
    Flow the whole joint and not just where the leak is or you will end up chasing the leak from one spot to another.

  4. #4
    Join Date
    Jan 2010
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    6,229
    Quote Originally Posted by jemawalton View Post
    Flow the whole joint and not just where the leak is or you will end up chasing the leak from one spot to another.

  5. #5
    Join Date
    Apr 2007
    Location
    Baltimore, Maryland
    Posts
    39
    I wouldn't use a wire wheel on a drill..... maybe an old fitting brush or sand cloth.... low heat.... make sure you have the line open so pressure has some where to go.

  6. #6
    John Culpepper's Avatar
    John Culpepper is offline CHANGE YOUR EMAIL ADDRESS Professional Member*
    Join Date
    Oct 2007
    Location
    Austin Texas
    Posts
    1,776
    x2 on the fitting brush. I have an assortment in my torch carrier. Hit it with some disc brake cleaner first to get the oil off (I use that because it cuts the oil and dries quickly) Pull your high side schraeder and use a small tip on your oxy/ac rig.
    Nemo me impune lacessit.

    How much blood do I have to bathe in to get clean?

    Don't look down on anyone unless you're helping them up.

  7. #7
    Join Date
    Dec 2002
    Location
    omaha
    Posts
    343

    Talking

    sell them a new coil, if repair does not work you will be back.

  8. #8
    Join Date
    Mar 2010
    Location
    Omaha, NE
    Posts
    2
    I have to agree with johncavh. The coil should probably be replaced. If it is not repaired correctly and there are damages you could end up liable.

  9. #9
    Join Date
    Jan 2010
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    6,229
    New coil probably as much as new unit.

  10. #10
    Join Date
    Feb 2010
    Location
    Cal
    Posts
    1,596
    Next time you replace a unit, take the opportunity to practice coil repairs on the old one if given the chance. Leaks at the tube sheet always seemed the toughest at first. It's much easier when it doesn't matter.
    For now.... clean, oil free, and well sanded makes it easy. have fun

  11. #11
    Join Date
    Jan 2010
    Posts
    6,229
    This repair should be easy. It's not at the sheet were the tube passes threw. As was said earlier clean area well & flux. Like i said in post #2 use a small wire wheel to assist in accomplishing this contrary to C-jac's post. Try it you'll like it.

  12. #12
    Join Date
    Apr 2007
    Location
    Baltimore, Maryland
    Posts
    39
    Quote Originally Posted by VTP99 View Post
    This repair should be easy. It's not at the sheet were the tube passes threw. As was said earlier clean area well & flux. Like i said in post #2 use a small wire wheel to assist in accomplishing this contrary to C-jac's post. Try it you'll like it.
    No need for flux, on copper to copper, unless you plan on using a high silver rod.... even then buy the flux coated rod.... just make sure it's clean and take your time!!

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