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  1. #1
    Join Date
    Apr 2013
    Posts
    5

    Exclamation patching a hole in fire sprinkler system

    a friend of mine asked me about repairing a 2inch round hole on a pipe for a fire sprinkler system in a warehouse. He says the pipe is around 3/16 thick.. there is no pressure or water in the pipe now... he has a 90amp flux core welder from harbor freight. can i actually cut a section of new pipe and put it over the hole and weld it? I'm a certified welder but not for pipe. (not yet at least)
    Last edited by JTwelder; 07-17-2013 at 10:24 PM.

  2. #2
    Join Date
    Sep 2005
    Location
    WY...armpit of U.S.A.
    Posts
    659

    Default

    I'm a bit confused by the mention of the 90 amp HF welder...were you planning on using it for the job? Is there a reason you can't cut out the bad section of pipe, rethread, add a coupler and short section of pipe instead doing a patchwork fix?

    Lets face it, the only time this piece of equipment is going to be used is if there is a fire. With a fire will come an insurance claim. Do you or the guy wanting the job done really want to go up against the insurance company's investigator admitting you were trying to go cheap on the fix? Can the job be done...sure. With the HF flux core welder...maybe/probably. Would I want to be on the receiving end of the lawsuit waiting to happen...not especially. Give an insurance company a chance to find an 'out' so they don't have to pay a claim, even though it may not compromise the system and works perfectly, and they will jump on it faster than a warehouse owner looking for a cheap fix.
    Miller 251...sold the spoolgun to DiverBill.
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  3. #3
    Join Date
    Oct 2006
    Location
    Illinois
    Posts
    594

    Default

    Verify on site for exact size of pipe and what hole looks like. Then check on a mechanical tee for the repair. You may get lucky and be able to install this fitting and plug or install a valve and nipple in threaded opening. No welding required.
    http://www.bing.com/images/search?q=...+tee&FORM=IGRE

  4. #4
    Join Date
    Feb 2012
    Location
    Wa
    Posts
    530

    Default

    Your a certified welder but have no welder?

  5. #5
    Join Date
    Apr 2011
    Posts
    356

    Default

    Quote Originally Posted by Cgotto6 View Post
    Your a certified welder but have no welder?
    Are you saying you need to own a welder to be certified?
    MillerMatic 211 Auto-set w/MVP
    Just For Home Projects.

  6. #6
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,894

    Cool

    Quote Originally Posted by Cgotto6 View Post
    Your a certified welder but have no welder?
    I work with prob 100 guys that are certified and don't have a machine of any kind...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
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  7. #7
    Join Date
    Feb 2012
    Location
    Wa
    Posts
    530

    Default

    Yes, but do those certified welders go and weld on sprinkler lines with a HF 90amp welder? Doesn't add up to me...

  8. #8
    Join Date
    Sep 2005
    Location
    Salem ,Ohio
    Posts
    3,894

    Cool

    Quote Originally Posted by Cgotto6 View Post
    Yes, but do those certified welders go and weld on sprinkler lines with a HF 90amp welder? Doesn't add up to me...
    Nope, you are right there...Bob
    Bob Wright, Grandson of Tee Nee Boat Trailer Founder
    Metal Master Fab Salem, Oh 44460
    Birthplace of the Silver & Deming Drill
    1999 MM185 w/185 Spoolgun,1986 Thunderbolt AC/DC
    Spool Gun conversion. How To Do It. Below.
    http://www.millerwelds.com/resources...php?albumid=48

  9. #9
    Join Date
    Oct 2007
    Location
    Cave Creek Az
    Posts
    948

    Default

    I agree with the threaded solution. Might be able to use a union an a couple of nipples (check code book for union usage for your application. Otherwise a L/R threaded coupler is available for the repair.

  10. #10
    Join Date
    Apr 2011
    Posts
    356

    Default

    Quote Originally Posted by Cgotto6 View Post
    Yes, but do those certified welders go and weld on sprinkler lines with a HF 90amp welder? Doesn't add up to me...
    No, and I wouldn't think they would weld on it with the best welder on the market either...that just isn't the way to fix the problem! (The solution has already been given.)
    MillerMatic 211 Auto-set w/MVP
    Just For Home Projects.

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