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  • just a reminder

    Plumbers use tapered threads, electricians don't. Our pipe threads are straight.

  • #2
    Re: just a reminder

    Really, I had no idea. Thanks.
    Buy cheap, buy twice.

    Comment


    • #3
      Re: just a reminder

      Originally posted by swampfox View Post
      Plumbers use tapered threads, electricians don't. Our pipe threads are straight.
      Something happen in another thread.We've discussed this I believe in other threads.Haven't we looked for die heads for sparky.I'm almost sure Bob D. has looked em' up for us before.

      Comment


      • #4
        Re: just a reminder

        I believe the current is the fittings are straight and the pipe is tapered, for Hot Dip Galvanized Rigid Steel Conduit,

        Two sheets from electrical conduit manufactures,

        http://www.alliedtube.com/electrical...id-conduit.asp
        The 3/4" taper NPT threads (ANSI B1.20.1)
        are full cut and hot galvanized after cutting.
        Color-coded end-cap thread protectors keep
        the threads clean and sharp and also provide
        instant trade size recognition.
        http://www.steelconduit.com/docs/RIGIDspecs.pdf
        RIGID is threaded on both ends, with a coupling applied to one end and a
        thread protector to the other. The pitch of the threads conforms to the
        American National Standard for pipe threads, general purpose (Inch),
        ANSI/AMSE B1.20.1. Threads are protected after cutting by an application
        of molten zinc. The quantity in primary bundles and master bundles conform
        to the NEMA standard bundle quantity.
        Columbia-MBF ALUMINUM
        PROVIDES COMPLETE LINE OF CONDUIT AND FITTINGS
        It shows NPT on all the specs,
        http://www.alliedeg.com/pdf/Alum%204p%20Flyer.pdf

        ANSI B1.20.1
        http://www.engineeringtoolbox.com/np...ads-d_750.html
        NPT- National Pipe Thread Taper- ANSI B1.20.1
        NPT pipe threads - dimensions according ANSI/ASME B1.20.1
        Sponsored Links

        Common American National Standard Pipe Taper Threads

        NPT - National Pipe Thread Taper
        FPT - female (internal) National Pipe Taper threads
        MPT - male (external) National Pipe Taper threads
        NPTF - Dryseal American National Standard Taper Pipe Thread (ANSI B1.20.3)
        For NPT threads a sealant compound or Teflon tape must be used for a leak-free seal. For NPTF no sealant is needed for a sealing.

        Characteristics of NPT (also known as ANSI/ASME B1.20.1 Pipe Threads, General Purpose):

        tapered thread 1o 47'
        truncation of roots and crests are flat
        60o thread angle
        pitch is measured in threads per inch
        Note! Pipe sizes do not refer to any physical dimensions. The outside diameter of a pipe or fitting must be measured and compared to a table for size identification. A 3/4" NPT pipe thread has an outside diameter - OD - of 1.050 inches.

        Each thread size has a defined number of threads per inch - TPI, or pitch. The 3/4" NPT pipe thread has 14 threads per inch. Both the TPI and OD of the thread are required for positive identification of thread size because more than one size have the same TPI.

        NPT - American Standard Pipe Thread Taper 1)
        Pipe Size
        (inches) Threads per Inch
        TPI - pitch Nominel Outside Diameter
        OD
        (inches)
        1/16" 27 0.313"
        1/8" 27 0.405"
        1/4" 18 0.540"
        3/8" 18 0.675"
        1/2" 14 0.840"
        3/4" 14 1.050"
        1" 11-1/2 1.315"
        1-1/4" 11-1/2 1.660"
        1-1/2" 11-1/2 1.900"
        2" 11-1/2 2.375"
        2-1/2" 8 2.875"
        3" 8 3.500"
        3-1/2" 8 4.000"
        4" 8 4.500"
        5" 8 5.563"
        6" 8 6.625"
        8" 8 8.625"
        10" 8 10.750"
        12" 8 12.750"
        14" 8 14.000"
        16" 8 16.000"


        1) The taper is 1/16 inch in an inch, which is the same as 3/4 inch in a foot (angle 1o 47')

        NPT threads are not interchangeable with NPS - National Pipe Straight - threads.

        NPT threads may look similar to ISO 7/1 threads. However, ISO and NPT threads should not be mixed. ISO threads have 55o taper angle versus 60o for NPT. The NPT root and crest configurations are also different from ISO. For ISO threads pitch is usually measured in millimeters (may be expressed in Inch). The pitch are different.


        The content in The Engineering ToolBox is copyrighted but can be used with NO WARRANTY or LIABILITY. Important information should always be double checked with alternative sources. All applicable national and local regulations and practices concerning this aspects must be strictly followed and adhered to.

        © The Engineering ToolBox 2005
        8 8 6
        Last edited by BHD; 08-27-2008, 10:37 PM.
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        Comment


        • #5
          Re: just a reminder

          Originally posted by drtyhands View Post
          Something happen in another thread.We've discussed this I believe in other threads.Haven't we looked for die heads for sparky.I'm almost sure Bob D. has looked em' up for us before.
          I think this might be a reference to the sparky running the 3/4" diesel line for his 150KW genset (a mere toy by the way ).
          ---------------
          Light is faster than sound. That's why some people seem really bright until you hear them speak.
          ---------------
          “If I had my life to live over again, I'd be a plumber.” - Albert Einstein
          ---------
          "Its a table saw.... Do you know where your fingers are?"
          ---------
          sigpic http://www.helmetstohardhats.com/

          Comment


          • #6
            Re: just a reminder

            Originally posted by Bob D. View Post
            I think this might be a reference to the sparky running the 3/4" diesel line for his 150KW genset (a mere toy by the way ).
            I agree it is only this:



            Not this!:

            Comment

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