ASME B16 Cases 1 and 2, and Their Implications for ASME B16.34 Valves

Similar to ASME Boilers and Pressure Vessel Code Cases, ASME B16 Standards Committee has recently begun to issue B16 Cases to address urgent needs for rules on materials and constructions not covered by existing B16 standards. Case 1[3], approved on December 16, 2013, provides alternative rules for establishing pressure-temperature ratings for ASME B16.34 [1] valves made of Group 3 (high nickel alloys) materials. Case 2[4], approved on February 13, 2014, provides rules for use of unlisted materials for construction of ASME B16.34 valves. In this paper, the author provides an overview of both Cases and discusses their potential implications for ASME B16.34 valves.