How to tell if a pipe is pressurized

Discussion in 'Irrigation / Sprinkler Forum' started by ErrayHota, Sep 23, 2011.

  1. ErrayHota

    ErrayHota New Member

    Messages:
    1
    Location:
    UT
    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. LLigetfa

    LLigetfa DIYer, not in the trades

    Messages:
    3,895
    Location:
    NW Ontario, Canada
    Assuming the water is cold, run the water out the hose bib and feel for which pipe is the coldest.
  3. mike1059

    mike1059 irrigation tech.

    Messages:
    56
    Location:
    Portland, OR
    you may also feel the vibration of the water through the pipe.
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