This standard specifies the types, dimensions and technical conditions of octagonal and oval metal ring gaskets for steel pipe flanges (American system). This standard is applicable to metal ring gaskets for ring connection flanges with nominal pressure PN of 2.OMPa (Class 150) ~ 42.OMPa (Class 2500) specified in HG 20615.
HG 20633-1997 history
2009HG/T 20633-2009 Metallic ring joint gaskets for use with steel pipe flanges(Class designated)
1997HG 20633-1997 Metal ring gaskets for steel pipe flanges (American system)
HG 20633-1997 Metal ring gaskets for steel pipe flanges (American system) was changed to HG/T 20633-2009 Metallic ring joint gaskets for use with steel pipe flanges(Class designated).