MSS - Manufacturers Standardization Society of the Valve and Fittings Industry.
Scope
This Standard Practice covers requirements for design@ dimensions@ material@ fabrication@ non-destructive examination and pressure testing of stainless steel and other alloy cryogenic service valves with body/bonnet extensions. This Standard Practice applies to cryogenic gate@ globe@ butterfly and ball valves and may be used in conjunction with other valve-specific standards including the following identified in this Standard Practice as a parent standard: ASME B16.34@ Valves-Flanged@ Threaded@ and Welded End. API 600@ Steel Gate Valves-Flanged and Buttwelding Ends. API 602@ Compact Steel Gate Valves@ Flanged Threaded@ Welding and Extended Body Ends. API 603@ Corrosion Resistant Bolted Bonnet Gate Valves-Flanged and Butt-Welding Ends. API 608@ Metal Ball Valves-Flanged@ Threaded and Welding End. API 609@ Butterfly Valves: Double Flanged@ Lug and Wafer Type. API 6D/ISO 14313@ Petroleum and Natural Gas Industries Pipeline Transportation Systems-Pipeline Valves. The requirements in this Standard Practice are not intended to supersede or replace requirements of a parent valve standard. This Standard Practice includes additional requirements specifically related to valves having body/bonnet extensions essential for cryogenic applications.