Schedule 40 steel pipes sizes, dimensions and weights are given in the following
chart per ASME
B36.10M-2004 "Welded and Seamless Wrought Steel Pipe" standard.
The wall thickness designations Standard, Extra-Strong, and Double Extra-Strong
have been commercially used designations for many years and gradually be
replaced by Schedule Number designation. “Standard” and “Schedule 40” designations
are identical for up to NPS 10 (DN 250), inclusive.
Schedule Numbers are convenient
designation for use in ordering pipe. The schedule number of a pipe refers to the wall thickness of the pipe: as the number increases, the wall thickness becomes thicker.
Schedule 40 designation is used for medium thickness pipes.