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See Chinese contents: SH/T 3403-2013 SH/T 3403-2013: Metallic ring joint gaskets for steel pipe flanges in petrochemical industry
This Standard specifies the requirements for the type, size and tolerance, technical conditions, examination and test of metallic ring joint gaskets for steel pipe flanges in petrochemical industry. This Standard is applicable to the manufacture and acceptance of metallic ring joint gaskets for grooved-surface steel pipe flanges with nominal pressures PN20 (Class 150) ~ PN420 (Class 2500) specified in SH/T 3406 Steel Pipe Flanges for Petrochemical Industry.
