Plant Construction Series


Sizes & Lengths commonly used for Steel Pipe

ANSI standard B36.10M establishes wall thicknesses for pipe ranging from 1/8 to 80-inch nominal diameter (‘nominal pipe size’). Pipe sizes normally stocked include: 1/2, 3/4, 1, 1-1/4, 1-1/2, 2, 2-1/4, 1-1/2, 3, 3-1/2, 4, 5, 6, 8, 10, 12, 14, 16, 18, 20 and 24. sizes 1-1/4, 2-1/2, 3-1/2, and 5 inch are seldom used. Unusual sizes are sometimes required for connecting to equipment, but piping is normally run in the next larger stock size after connections has been made.

1/8, 1/4, 3/8 and 1/2 inch pipe is usually restricted to instrument lines or to service and other lines which have to mate with equipment. 1/2 inch pipe is extensively used for steam tracing and for auxiliary piping at pumps, etc.

Straight pipe is supplied in ‘random’ lenghts (17 to 25 feet), and sometimes ‘double random’ lenghts (38 to 48 feet), if preferred. The ends of all these lenghts are normally either plain (PE), beveled for welding (BE), or threaded and supplied with one coupling per length (‘threaded and coupled’, or ‘T&C’).

If pipe is ordered ‘T&C’, the rating of the coupling is specified, other types of ends, such as grooved for special couplings, can be obtained to order.

Next time: Diameters & Wall Thicknesses of Pipe


Total Cad System Inc.


One Response to “Plant Construction Series”

  1. Says:

    This is a very good tip espcially to those
    fresh to the blogosphere. Simple but very precise info…Thanks for sharing this one.
    A must read post!

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