SCOPE

1.1 This Standard Practice covers requirements for material, design, dimensions, fabrication, non-destructive examination and pressure testing of stainless steel and other alloy cryogenic service valves with body/bonnet extensions. Requirements for check valves for cryogenic service, which may not require body/bonnet extensions, are also covered. This Standard Practice applies to cryogenic gate, globe, butterfly, ball, and check 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 Welding End
API 600, Steel Gate Valves - Flanged and Butt-welding Ends, Bolted Bonnets
API 602, Steel Gate, Globe, and Check Valves for Sizes NPS 4 (DN 100) and Smaller for the Petroleum and Natural Gas Industries
API 603, Corrosion-resistant, Bolted Bonnet Gate Valves - Flanged and Butt-welding Ends
API 608, Metal Ball Valves - Flanged, Threaded and Welding Ends
API 609, Butterfly Valves: Double Flanged, Lug- and Wafer-type
API 6D, Specification for Pipeline Valves (identical to ISO 14313)

1.2 The requirements in this Standard Practice are not intended to supersede or replace requirements of a parent valve standard.

1.3 This Standard Practice included additional construction detail requirements specifically related to valves, including body/bonnet extensions essential for cryogenic applications.