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  • 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, 10:24 PM.

  • #2
    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.
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    • #3
      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

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      • #4
        Your a certified welder but have no welder?

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        • #5
          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
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          • #6
            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

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            http://www.millerwelds.com/resources...php?albumid=48

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            • #7
              Yes, but do those certified welders go and weld on sprinkler lines with a HF 90amp welder? Doesn't add up to me...

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              • #8
                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

                Spool Gun conversion. How To Do It. Below.
                http://www.millerwelds.com/resources...php?albumid=48

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                • #9
                  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.

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                  • #10
                    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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                    • #11
                      patching a hole in fire sprinkler system

                      If its a sprinkler there should be threaded unions any way. The only weld tie ins are where the 1 1/2" head lines couples into the 4" main. Home Depot will thread them for you or HF has a kit for bout 50-60.

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                      • #12
                        in many places...On any change or repair to the fire sprinkler system... the work has to be done by a contractor approved by the insurance underwriter... then inspected and recertified... in addition many municipalities and counties require an inspection and approval by their own inspectors....

                        failure to do so may entail criminal as well as civil penalties on top of nullification of ALL insurance coverage...

                        a failed seal and loss of air pressure could result in an entire warehouse full of goods getting soaked.... not even considering a fire..

                        HF 90 amp fluxcore???????????? kidding right??

                        The very best answer is to smile politely and thank him for considering you but you needed to decline the offer...
                        Last edited by H80N; 07-21-2013, 03:48 PM.
                        .

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