Assertion: pipe's schedule | /r/UsedFor | refer to the wall thickness
Facets:
value: for tubes
type: PURPOSE
Source sentences:
text: Pipes are generally measured by the inside diameter (ID), often called the “nominal” diameter, and a “schedule”, which refers to the wall thickness whereas for tubes, the outer diameter (OD) and wall thickness, which are exact measures in inches or millimeters roughly corresponds to the tube size.