This standard is the regulations that should be followed when steel pipe flanges, gaskets and fasteners (European system) are used together. This standard applies to steel pipe flanges, gaskets and fasteners specified in HG 20592 ~ HG 20613.
HG 20614-1997 history
2009HG/T 20614-2009 Specication for selection of steel pipe flanges,gaskets and bolting(PN designated)