Practical pressure testing water lines & stop valve

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Rossn, May 4, 2021.

  1. Rossn

    Rossn Member

    Joined:
    Dec 12, 2017
    Location:
    Denver, CO
    I am part-way through my re-plumb... got in the 1-1/4 main distribution branch, and cold to some fixtures (shower, tub, lav) connected.

    The work completed thus far is 98% copper press (Viega fittings) and the rest PEX-A.

    What practical level of testing are you usually comfortable with? Testing with air OK on this type of plumbing?

    The inspector doesn't seem to care, knowing it is a remodel and I would see any leaks.

    I've run an air test for 1 hr at 60 psi (same as our static pressure), and leaked down 3 psi. I went and closed all the stops and am re-running the test. I have about 9 ball valves for shutting off areas of the house, external hose bibs, etc. There is one Moen Flo, and one new stop valve.

    My family has been without water for a few days, and so I need to turn it on this afternoon, but want to be 'comfortable enough'. I will have access to the plumbing for many months, so if any small leak is discovered, it is not a huge deal.

    Side note - I don't have a lot of experience with compression fittings. I turned about 220 degrees through a turn, and it was quite tight.... I don't hear any air leaking. Any chance I need to tighten it more?
     
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    You could use a bubble solution to check for a leak. That is more sensitive than hearing.
     
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  4. Rossn

    Rossn Member

    Joined:
    Dec 12, 2017
    Location:
    Denver, CO
    fair enough. I just want to be comfortable it doesn't come flying off and flood the place. I'm not sure how uncommon it is to only have to tighten a compression fitting 2/3 of a turn.
     
  5. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    You mean 2/3 turns beyond hand tight?
     
  6. Rossn

    Rossn Member

    Joined:
    Dec 12, 2017
    Location:
    Denver, CO
    Yes

    it definitely leaks down much faster (maybe 1 psi/min) when 80 psi. My daughter needs a bath - I don’t think it is a massive leak or I would hear the air rushing. I’m going to hook up the water and keep an eye out. As long as it is a slow leak, I have plenty of time to track it down. If it was an impressed fitting I think it would make a lot of noise.
     
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