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  • stain steel threaded pipe

    We occasionally do stainless steel threaded pipe systems for lubricating oil to bearing sysytems. The materials are sch 40, 304 pipe, at 1.5 dia down to .50 dia and system pressure at 50 psi max. We seem to always have leaks. What is the recommended tooling and process for threading stainless steel pipe on a ridgid 535 machine and which pipe sealant should be used.

  • #2
    Re: stain steel threaded pipe

    what are you using for lubrication when you cut the threads?

    Vince

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    • #3
      Re: stain steel threaded pipe

      We are using Mobilmet omicron cutting fluid

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      • #4
        Re: stain steel threaded pipe

        I guess the first obvious question, is are you using dies specifically designed for threading stainless steel? (See this link for Universal dies for the 535 in the top section. There you will find stainless steel dies.) It is also suggested that you use RIDGID Extreme oil.

        How do the threads look? Are they torn, rough, smooth? According to our thread expert:
        Sometimes smooth threads like we see on stainless are harder to seal because of no defects. Defects smear metal and hold dope. Rough threads, if not too bad, are not always a problem.

        Hope that helps, and sorry for the delay in responding.
        Steve
        Last edited by smorris; 04-02-2009, 07:56 AM.
        Steve
        www.MorrisGarage.com

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        • #5
          Re: stain steel threaded pipe

          OK! Basically, if you were working as a Stainless Smith, full-time, then these joints would be TIG welded, so leaks would hardly be an issue. Should you need to join to another material, then a flange coupling would be first choice.
          I work only in stainless. Often at Breweries, and food factories. One does notice that Plumbers, and Stainless Smiths get the job done in drastically different ways. This may be the way to go for you, instead of struggling with a technique that is unnescessary to do the job!
          Happy Easter from Norway to all on the Ridgid Forum!!

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          • #6
            Re: stain steel threaded pipe

            I have always used nickel-impregnated teflon tape and pipe dope, otherwise the threads just seem to bind
            West Trail Mechanical Ltd
            Service. Commitment. Expertise.

            www.westtrailmechanical.ca

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