This standard specifies the type and size of metal ring gaskets for steel pipe flanges. This standard is applicable to metal ring gaskets for steel pipe flanges with ring connection sealing surface of nominal diameter DN15 ~ DN900 and nominal pressure PN2.0MPa ~ PN42.0MPa.
GB/T 9128-2003 history
2003GB/T 9128-2003 Dimensions of metallic ring-joint gaskets for use with steel pipe flanges