90D Elbow:

Sch 20 ASTM A234 WPB 90D ELBOW :

Product Description:

Carbon Steel 90D ELBOW(SR),ASTM A234 WPB,SMLS,SCH.20

Sch is short for schedule,said wall thickness and pipe fittings size is specified with two non-dimensional numbers:a nominal

 pipe fittings size for diameter based on inches,and a schedule (Sched. or Sch.) for wall thickness.

Wall thickness level:Sch10,Sch20,Sch30,Sch40,Sch60,Sch80,Sch100,Sch120,Sch140,Sch160 etc

A234 Piping Fittings of Wrought Carbon Steel and Alloy Steel for Moderate and high Temperature Service

ASMEANSI B16.9:Factory-Made Wrought Steel Butt welding Fittings

ASME B16.28:Wrought Steel Butt welding Short Radius Elbows and Returns

Specification:

NB (nominal bore) is the European designation equivalent to NPS is DN (diamètre nominal/nominal diameter/Durchmesser nach Norm), in which sizes are measured in millimeters. NB (nominal bore) is also frequently used interchangeably with NPS.
OD is the outside diameter of the pipe and is fixed for a given size.