Historical
ASTM C585-90(2004)
Standard Practice for Inner and Outer Diameters of Rigid Thermal Insulation for Nominal Sizes of Pipe and Tubing (NPS System
1.1 This practice is intended as a dimensional standard for preformed rigid thermal insulation for pipes and tubing.
1.2 This practice covers insulation supplied in cylindrical sections, usually split into half-sections, and lists recommended inner and outer diameters of insulation having nominal wall thicknesses from 1 to 5 in. (25 to 127 mm) to fit over standard sizes of pipe and tubing.
1.3 The values stated in inch-pound units are to be regarded as the standard. The values stated in SI units are provided for information only.
This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM International [astm]