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  1. #1

    Instrument NPT Tube Fittings Pressure-Temperature Rating

    As you know, there are Pressure-Temperature rating tables for flange connections (300,600,900,etc). Do you know if there are any tables for Instrument NPT connection classes?
    The only technical data I could find was a curve in "Trouvay & Cauvn" Piping Equipment Book Chapter 4 (Forged Steel Fittings) which covers NPT 3000 and NPT 6000 classes of Carbon Steel F304 and F316 grades.


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  3. Re: Instrument NPT Tube Fittings Pressure-Temperature Rating

    You might check out Instrumentation Tubing and their Connections by Nirbhay Gupta, document #12725993 on scribd.com (you have to register and upload a document to download a document). 127 pages on tubing and fittings. Page 23 covers design and relevant codes.

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  5. #3

    Re: Instrument NPT Tube Fittings Pressure-Temperature Rating

    Thank you Carl.
    But there was no data regarding the pressure ratings. It just refers to ASME Section IIIâ€گDivisionâ€گI subâ€گsection NB.

  6. #4

    Re: Instrument NPT Tube Fittings Pressure-Temperature Rating

    Thank you Carl.
    But there was no data regarding the pressure ratings. It just refers to ASME Section III‐Division‐I sub‐section NB.

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  9. Re: Instrument NPT Tube Fittings Pressure-Temperature Rating

    Hey Aidini,

    I'm having the same issue, but my thread didn't get any reply yet. If it can help you: there's a small table in ASME B31.1-2007 Power Piping p38 that mentions pressures for threaded joints to 3" (material independent).
    Let me know if you find more extensive information on this.

    My threads; McPopov :


  10. Re: Instrument NPT Tube Fittings Pressure-Temperature Rating

    Swagelok publishes the pressure ratings of its tube fittings on page 9 of
    Gaugeable Tube Fittings and Adapter Fittings,

    [link Point to another website Only the registered members can access]
    A derating pressure-temperature table for tubing is on page 3 of the Swagelok Stainless Steel Seamless Tubing: Fractional, Metric, and Imperial Sizes manual

    [link Point to another website Only the registered members can access]


  11. #8

    Re: Instrument NPT Tube Fittings Pressure-Temperature Rating

    Carl,
    Thank you.

    In those links you mentioned, the permissible pressure has been stated.
    The table I have been unable to find is what you can find class 3000, 6000, 9000 pressure-temperature table for different fitting materials.

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