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Thread: cleaning/dressing old pipe threads

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  1. #1
    DIY Senior Member gardner's Avatar
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    Default cleaning/dressing old pipe threads

    I have a somewhat grotty old 3/4 threaded hub on a galvanized steel fitting and I need to thread a new 3/4 brass fitting into it. The old threads are not particularly nice, but they are likely serviceable. Is there a standard procedure for cleaning and dressing an old rusty, putty-encrusted fitting to take a new fitting and make a good seal?

    I was thinking of getting a 3/4 black pipe nipple, cutting a slot across the threads (like on a self tapping screw) with a grinder and using this to run into the old hub to clean up the rust and crust. Kind of a home made chasing tap. Is there a better way?
    Last edited by gardner; 05-11-2009 at 02:28 PM.

  2. #2
    Master Plumber nhmaster's Avatar
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    Lotta work when you could just bust out the wire brush. If the threads are bad you need a 3/4 npt die to chase them.

  3. #3
    In the Trades Gary Swart's Avatar
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    You might find a set of pipe dies at a tool rental store. Shouldn't cost too much for half a day. If you were in Yakima, I'd loan you a 3/4" die.

  4. #4
    DIY Senior Member Nate R's Avatar
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    Quote Originally Posted by Gary Swart View Post
    You might find a set of pipe dies at a tool rental store. Shouldn't cost too much for half a day. If you were in Yakima, I'd loan you a 3/4" die.
    Doesn't he need a 3/4" tap?

  5. #5
    Master Plumber nhmaster's Avatar
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    I have a somewhat grotty old 3/4 threaded hub on a galvanized steel fitting and I need to thread a new 3/4 brass fitting into it.


    Yep.

    The disadvantage of speed reading

  6. #6
    DIY Senior Member gardner's Avatar
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    Thanks all. I'm sure the hub won't be so bad I need to run a real tap into it. I expect I can get by with a wire brush. This is a cottage/camp project and I am trying to plan ahead for what I may need when I get there and start working on it, so that's what got me going on pre-fabbing a low budget tool, just in case.

    Besides the bogus threaded 3/4 fitting on my pump to fix, I also have a couple of burst copper lines to take care of, as well as correcting the pitch of those lines and adding a drain to avoid water staying in the lines next year.

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