无缝钢管问题求教

yud7200

无逢钢管  PIPE  4″ SCH 40  A53  TYPE F   其中4″是否是NPS ，不知SCH40是什么意思？
3 T* o$ r; `1 A
请达人指教！

Joury

A53  TYPE F refers to ASTM A53 Type F, 4‘‘ is NPS 4.
Pipe size is specified with two non-dimensional numbers: a nominal pipe size (NPS) based on inches, and a schedule (Sched. or Sch.).
5 B- r; y5 y( ^) SThe original intent was that each schedule would relate to a given pressure rating, however the numbers deviated so far from wall thicknesses in common use that this original intent could not be accomplished.Also, in 1939, it was hoped that the designations of STD, XS, and XXS would be phased out by schedule numbers, however those original terms are still in common use today (although sometimes referred to as standard, extra-heavy (XH), and double extra-heavy (XXH), respectively). Since the original schedules were created, there have been many revisions and additions to the tables of pipe sizes based on industry use and on standards from API, ASTM, and others.

dljdw

SCH（schedule number）
5 ]  X- c! k+ d! A5 _表示管壁厚度系列的号码
SCH40，SCH80。SCH160

数字越大，管壁越厚。