PTC-B16.23 Overview
(b) pitch (slope) (c) abbreviations for end connections (d) sizes and methods for designing openings for reducing fittings (e) marking (f) material (g) dimensions and tolerances 2 GENERAL 2.1 Relevant Units This Standard states values in both SI (Metric) and U.S. These systems of units are to be regarded separately as standard. Within the text, the U.S.