Standard of New England’s Pipe Chart describes the physical dimensions and weight of standardized pipe. Pipe is manufactured according to these standardized physical characteristics.
When looking at our Pipe Chart, choose either the Pipe Size or O.D. size from the two far-left columns as your starting point. Then choose the schedule from the top row. Find where your pipe size and schedule intersect. You will see that each box has two numbers describing your pipe selection. The top number, in blue, is the wall thickness. The black number below it is the weight in pounds per foot of pipe.
Nominal Pipe Size
NPS (Nominal Pipe Size), listed in the first column of our Pipe Chart, identifies the nominal diameter of the pipe which lies between the inside and outside diameters. For example, 4″ Sch 80 pipe has an O.D. (outside diameter) of 4.50” and an I.D. (inside diameter) of 3.826″.
A pipe’s schedule identifies its wall thickness and is trickier than you think to get right. For example, the schedules for 40 and STD pipe from 1/8” through 10″ are identical. Above 10”, however, the schedules of 40 or STD pipe vary and must be specified to clarify the required wall thickness. The same is true for schedules 80 and XH which must be clarified above 8”.
The weights given on our Pipe Chart are based on carbon steel pipe but can vary due to many factors including manufacturing tolerances and other allowable factors such as alloy. For most situations this weight is an acceptable estimate for estimating freight costs.
For a more in-depth look at pipe schedules, read: The Truth Behind True Schedules.
For a true story about how knowing how to read this Pipe Chart can save your hide, read: A Story about Pipe & Having our Customer’s Back.
Terms Often Used When Talking About Pipe
ANSI – American National Standards Institute
ASME – American Society of Mechanical Engineers
API – American Petroleum Institute
NPS – Nominal Pipe Size
NPT – National Pipe Thread
OD – Outside Diameter
STD – Standard
XH or XS – Extra Heavy or Extra Strong
XXH or XXS – Double Extra Heavy or double Extra Strong
ASME/ANSI B 36.10 – Welded and Seamless Wrought Steel Pipe
ASME/ANSI B36.19 – Stainless Steel Pipe