Testing Drain Lines

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by GeronimoDF, Oct 5, 2009.

  1. GeronimoDF

    GeronimoDF New Member

    Oct 5, 2009
    Long Island, NY
    Does anyone know a good link that talks about testing drain lines? I searched and searched.....I just replaced all the cast iron with 4inch PVC, and I want to test all the connections. Any hints? I read use a 10ft column of water which creates ~ 10psi. In order to fill it up, I would need to fill up 16 feet up. Is that the best way?


  2. johnjh2o1

    johnjh2o1 Plumbing Contractor for 49 years

    Aug 9, 2009
    That would be OK. In some towns we had to flood the system through the roof.
    That put a 30' head on the pipe.

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  4. Inspektor Ludwig

    Inspektor Ludwig Journeyman/Inspector

    May 11, 2006
    In the good ol' UPC
    I think it depends on what code you use in NY. I would fill the all of the waste piping with water until it came out of the vents on the roof. The 10ft head of water results in around 5 lbs of pressure. The idea is to have at least a 10ft head of water over the HIGHEST joint in the system which would mean your last vent joint. Sometimes that's not possible so just filling the system with water through the roof should be adequate.
  5. dcelite

    dcelite Plumber

    Oct 5, 2009
    Los Gatos, CA
    You can fill the system with air if it makes any easier or less mess. Just cap off all the outlets and adapt to a pressure guage on one outlet (just like a gas test).
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