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Thread: How to tell if a pipe is pressurized

  1. #1
    DIY Junior Member ErrayHota's Avatar
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    Sep 2011
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    Default How to tell if a pipe is pressurized

    I need to tap into a line that is going to a hose bib, so that I can add another hose bib in another location. The problem is that in the place where I'm gonna dig to get to the pipe, there are actually 3 or 4 pipes running together in that trench. Only one is pressurized, that is, going to the existing hose bib. The others are different sprinkler zones. Is there a way to determine which pipe to tap into? Or do I have to just start cutting until I find the right one?
    Thanks.

  2. #2
    DIYer, not in the trades LLigetfa's Avatar
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    Default

    Assuming the water is cold, run the water out the hose bib and feel for which pipe is the coldest.

  3. #3
    irrigation tech. mike1059's Avatar
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    Default

    you may also feel the vibration of the water through the pipe.

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