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  1. #1
    Join Date
    Mar 2007
    Location
    Western Montana
    Posts
    261

    Default Blue residue on gas shut off valve

    Very pretty shade of blue residue on a gas shut off valve, would guess the gas lines were last inspected in 1959 based on the tag by a nearby furnace. My gas leak detector did NOT indicate a leak (though it did go off when I put it near the draft hood of a nearby 53 year old furnace).

    Wondering what sort of chemical reaction would cause this? Suspect the valve is copper; would it be copper sulfate from condensation?

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  2. #2
    Join Date
    Mar 2007
    Location
    Near Philly, Pa.
    Posts
    1,643

    Cool Re: Blue residue on gas shut off valve

    Verdigris - Wikipedia, the free encyclopedia

    Someone must have spilled something on it.

    Keep the fire in the fireplace.

  3. #3
    Join Date
    Mar 2007
    Location
    Orlando, FL
    Posts
    1,340

    Default Re: Blue residue on gas shut off valve

    Someone sprayed it with soapy water to check for leaks, and didn't clean it off.


  4. #4
    Join Date
    Mar 2007
    Location
    Spring Hill (Nashville), TN
    Posts
    5,847

    Default Re: Blue residue on gas shut off valve

    Quote Originally Posted by Dom D'Agostino View Post
    Someone sprayed it with soapy water to check for leaks, and didn't clean it off.
    Yep, that is what it looks like....

    Scott Patterson, ACI
    Spring Hill, TN
    www.traceinspections.com

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