This standard specifies the type, size, technical requirements and marks of flanged ring-plate loose sleeve steel pipe flanges whose nominal pressure is marked with PN. This standard is applicable to the pipe end flanged plate loose sleeve steel pipe flange, flanged short section plate loose sleeve steel pipe flange and long neck flanged short section plate loose sleeve steel pipe with nominal pressure PN2.5~PN16 flange.
GB/T 9122-2010 Referenced Document
GB/T 9112 Types and parameters for steel pipe flanges
GB/T 9124 Specifications for steel pipe flanges*, 2011-10-01 Update
2011GB/T 9122-2010 Loose plate steel pipe flanges with lapped pipe end and pressed collar with long neck
2000GB/T 9122-2000 Loose plate steel pipe flanges with lapped end
GB/T 9122-2010 Loose plate steel pipe flanges with lapped pipe end and pressed collar with long neck was changed to GB/T 9124.1-2019 Steel pipe flanges—Part 1:PN designated.