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Thread: Solder won't let go

  1. #1
    DIY Junior Member MRC's Avatar
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    Default Solder won't let go

    Hello all~

    Hey my line going from the expansion tank into the WH has the pressure fitting /nut on the WH end and solder off the expansion tank "t" fitting. This is a flex line and it has a slow drip/leak. (perfect for waterboarding)
    The nut came off just fine but the solder will NOT let go.
    Question - The tank is vertical & above the intake line. Is there water 'trapped' in the line via vacuum?
    I have released the pressure from the expansion tank & still no dice.

    Help?.......

  2. #2
    Forum Admin, Expert Plumber Terry's Avatar
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    Have you opened up all the faucets above so that they can drain down?

  3. #3
    DIY Junior Member MRC's Avatar
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    yuppers. let them drain for a good 30 minutes first thing.

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    DIY Junior Member MRC's Avatar
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    Ok...so the trick was to get the conection REALLY hot.....I mean to the point where it was burning 18 inches down the line.
    So new question. I am very used the running NEW plumbing & joints. Do I need to replace this entire T or simply get the joint hot again and clean it out prior to soldering in the new line?

  5. #5
    In the Trades Gary Swart's Avatar
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    Copper fitting can be cleaned an reused. That is a great thing about copper. However, it is somewhat tedious to do so. Now, if it's late at night and you are a long way from an open supply house, then yeah, clean the old one. Otherwise, I would spend the few cents it costs for a new tee and be done with it. So, it's your choice. It's likely the problem you had getting the joint apart was some water remained in the pipe. It doesn't take much. Make very certain the entire pipe is empty and dry before trying to solder your new joints.
    Last edited by Gary Swart; 06-26-2011 at 03:56 PM. Reason: add info

  6. #6
    DIY Junior Member MRC's Avatar
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    Done and done. Opted to clean up the inside of the T and close it up. No runs, drips or fouls.
    Thanks for the help guys.

    MC

  7. #7
    Moderator & Master Plumber hj's Avatar
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    quote; where it was burning 18 inches down the line

    That was NOT burning it was heated steam from water in the line. When you say you "relieved the pressure in the tank" does that mean you depressed the air valve to let it out? IF so the tank was still full of water. You had to turn off the hot water pressure then let the faucets run until the flow stopped, and even then there might not have been enough air in the tank to push all the water out so you might have had to connect an aircompressor and inject air until NO water flowed from the faucet.
    Last edited by hj; 06-26-2011 at 04:25 PM.

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