This Standard applies to new construction and covers pressure-temperature ratings, dimensions, tolerances,materials, nondestructive examination requirements,testing, and marking for cast, forged, and fabricated flanged, threaded, and welding end and wafer or flangeless valves of steel, nickel-base alloys, and other alloys shown in Table 1. Wafer or flangeless valves, bolted or through-bolt types, that are installed between flanges or against a flange are treated as fanged-end valves. Alternative rules for NPS 2% and smaller valves are given in Mandatory Appendix V.
