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OT Plumbing / copper corrosion fix - advice sought

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  • Mcgyver
    replied
    thanks guys....could have been drano once upon a time, except that doesn't explain why it progressed the last several years (I would hear about it and be expected do deal with a clog, which has happened...fixed via an ugly messy cleanout in the ceiling the room underneath).

    Fastrack, there is nothing I've connect to the copper except the rubber MJ, an nothing I'm aware of touch it. wiring for the dishwasher comes up from the basement and is bx - in the next cabinet carcass over

    Leave a comment:


  • kev74
    replied
    If this is an invitation for improper bandaids, I'm in!

    You could cut out the bad part and replace it with some hose and hose clamps.

    You could clean the pipe and solder a patch over the crack.

    Those Flex seal commercials make me think it can fix anything!

    Or you could cut it out and replace it properly.

    Leave a comment:


  • rickyb
    replied
    Opening is too straight for corrosion. Looking more like a seam that opened up.. yes copper is “seamless” but that’s what I looks like. Possibly a ridge or groove formed in the pipe during mfg. if so it’s limited to that piece. Cut it out and you have a good repair.

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  • Fasttrack
    replied
    Cut it back and slip a Fernco over what's left to adapt it to a PVC P-trap?

    Does your dishwasher use the copper pipe as a ground connection (common in older houses when the nearest outlet is only 2-prong)?

    I've seen that kind of corrosion in a few cases:

    1) Galvanic corrosion
    2) High pH (>8) and chlorinated water or Draino left too long (again, high pH + chloride ions)

    Leave a comment:


  • brian Rupnow
    replied
    It looks like it may have plugged up at sometime in the past, and some well intentioned soul has put a bunch of Draino in there and left it to set overnight. that stuff will, given enough time, eat holes thru copper like that.

    Leave a comment:


  • Mcgyver
    started a topic OT Plumbing / copper corrosion fix - advice sought

    OT Plumbing / copper corrosion fix - advice sought

    Awhile I ago I put in a new kitchen. The old sink had copper running up a solid brick wall and then elbowing under the counter. I decided for my drain for the install, to tie into it the copper stub with an MJ clamp and then ABS to the sink. Going down the drain is the kitchen sink and dishwasher - No chemicals other than soaps. Soft city water. Copper would have been installed in the 50's

    A leak developed some time ago, very small and at the time I assumed it was a crack the pipe coming beack from the end as all I could see was a thin line beside where the MJ ended. I fixed it by clamping a piece of silicon rubber around it. I know, I'm a bad man for not doing it properly, but its horrendously awkward to get into and the wood cabinets are there so solder made me nervous. The leak came back after a while so we started putting a bowl under the leak. (Now I am a really horrible man, but its still a bloody awkward repair and I don't squirm under sinks as easily as I used to)

    Very recently, like 5:00 a.m. today making coffee, it started gushing. time to face music. Pull all the ABS and garborator out so I can get in there. Was prepared to cut out the back panel if I needed to do solder.

    Took a picture, wholly crow!! I have never seen a gaping hole like that in copper . The photo is directly looking up from the bottom so it looks like the area of corrosion forms a line at where the liquid would sit along the bottom of the pipe. But its soft water only, kitchen stuff is going down the drain...I thought copper was pretty bullet proof in that situation. There is the tie in to the cast iron stack but thats a ways away. Can't think of anything else that would cause galvanic corrosion.

    What do you guys think, and whats the solution? First thought is to cut past the bad section and connect there with the MJ....but the corrosion has broken through there, its like;y bad all along the bottom. We're not going to be here forever and almost for sure given whats going my nice old home will knocked down...so I'm not stiffing the next guy if a do a quick and dirty repair. Still....thinking the right way is cut out the back panel, soak all the strapping with water and desolder this corroded pipe at the elbow and replace it

    thoughts? ideas?


    Last edited by Mcgyver; 12-14-2021, 07:07 PM.
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