Pipe Schedule Numbers (5-XXS) correspond to the most widely recognized and produced wall thicknesses of steel pipe. Pipe sizes are unique, and these schedules of wall thicknesses do not apply to tube. Schedule numbers include; 5, 10, 20, 30, 40, STD, 60, 80, XS, 100, 120, 140, 160, XXS. These “schedules” refer to a specific wall thickness in inches corresponding to a specific Outside Diameter (O.D.) size in inches. Please note schedule 40 (Sch 40) and standard (Std) are the same wall thickness through 10″ Pipe Size, while Sch 80 and XH are the same wall thickness through 8” Pipe Size. Actual wall thickness are always written as “Decimal Parts” of an inch and are written to three decimal places (example: one inch wall is written 1.000”). The method of manufacture and sizes described limit the wall thickness that can be produced. (Hence a 4 ½” O.D. pipe could not have a 3.000” wall.)
Every pipe ever made has several things in common with every other pipe. These are:
• Outside diameter or O.D.
• Inside diameter or I.D.
• Wall Thickness
These five dimensions will come into play with every pipe supplied by Federal Steel Supply, Inc.
What is the weight of steel pipe?
Additionally, the weight of steel is a constant measuring .2833 pounds per cubic inch. Then what is the weight of steel pipe? There are some mathematical formulas that link these dimensions. For any round steel pipe or tube the following is true:
The 2014 Annual Book of ASTM standards calculates weight per foot of pipe using the following formula: (O.D – Wall) * Wall * 10.69
What is the Federal Steel Supply Pipe Chart and how can I use it?
With over 35 years in the pipe business, we have created several versions of the Federal Steel Supply Pipe Chart. We believe our pipe chart easily conveys the sizes of pipe with the weight per foot. It is meant to be a quick reference document for those who work with pipe on a daily basis or even for those who may be purchasing pipe for the first time.
Have you ever measured 2” x 4” lumber and discovered it does not actually measure 2” x 4”? Sizes of pipe are similar. The pipe chart starts at 1/8” NPS and ends at 48” O.D. For NPS 1/8” through 12”, notice the O.D.s are different from the NPS. For Nominal Pipe Sizes greater than 14” the measured outside diameter is identical to the NPS.
The chart describes NPS and Scheduled Walls as compared to actual O.D. To the right of the NPS/OD columns, are the rows of wall thickness (in bold) and the weight/ft (underneath). Hence, one could look up a size to its corresponding schedule and know the true diameter, the NPS, and the weight per foot. For example, a 10 NPS Schedule XXS has an OD of 10.75”, a wall thickness of 1.000”, and weighs 104.23 lbs/ft.