Pipe fittings schedule “Sch” of the pipe indicates the wall thickness series.

*Sch 10s means: the wall thickness of the connecting pipe is 2.9mm and the material is stainless steel.
*Sch 10s means: the series with s is dedicated for stainless steel, and for carbon steel it is not used.

The pipe schedule is the ratio of the pipe design pressure to the allowable stress of the material at the design temperature multiplied by 1000 and rounded.

Sch is stipulated by the American National Standards Institute ANSI B36.10 (welded steel pipes and seamless steel pipes) standard in 1938. The steel pipe series (SH3405) of petrochemical enterprises also express the wall thickness series according to schedule.

The pipe fittings schedule (Sch) is the ratio of the design pressure to the allowable stress of the material at the design temperature multiplied by 1000; and the rounded value.

Sch=（P/σ）×1000, P is the design pressure (MPa), and σ is the allowable stress (MPa) of the material at the design temperature.

We will post the comparison table of NPS, OD(mm) and each specification schs below, if you are interested, please read it down

Remember it: schedule is not a wall thickness, but a series of wall thicknesses. The same pipe diameter has different wall thicknesses in different schedules

ANSI B36.10 wall thickness grade: Sch10, Sch20, Sch30, Sch40, Sch60, Sch80, Sch100, Sch120, Sch140, Sch160 ten grades;
ANSI B36.19 wall thickness grade: Sch5s, Sch10s, Sch40s, Sch80s four grades.

Check table Dimension and Wall Thickness to ANSI B36.19/B36.10.

Posted by stainless steel pipe and fittings supplier, KAYSUNS.