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See Chinese contents: HG/T 20614-2009 HG/T 20614-2009: Specification for ion of steel pipe flanges, gaskets and bolting (PN designated)
This standard specifies the general rules for selection of the steel pipe flange, gaskets and bolting (PN designated). This standard is applicable to the steel pipe flange, gaskets and bolting which are specified in the HG/T 20592 - HG/T 20613.
