Pipe designation and thickness

There are 2 units of U.S. customary and SI unit.


Abbreviation Name Unit Markings
NPS Nominal Pipe Size Inch NSP 6" or NPS 8"
DN Diameter Nominal meter DN150 or DN 200
SCH Shedule - Sch80 or Sch80S (*)
WT Wall thickness in or mm 1/2" or 12.7 mm

(*) Affix _S specified in ASME B36.19M for stainless steel pipe wall thickness.

Standardization of dimention


Please share latest spec.

Click the link to find current edition.

1 Like