1.0.1 This national standard specifies the basic technical requirements of steel pipe flanges (PN designated), including nominal dimension, nominal pressure, material, pressure-temperature rating, flange type, dimension, seal contact face, tolerance and marking.
1.0.2 This Standard is applicable to steel pipe flanges and blind flanges in nominal pressure of PN2.5~PN160. The nominal flange pressure grades are denoted by PN, including the following nine grades: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100 and PN160.
1.0.3 Nominal dimension and outside diameter of the steel pipe
Outside diameter of the steel pipe applicable to this Standard includes two series: A and B, where A designs for the international purposes (it is commonly referred to as "John Guest"), while B designs for the domestic adopting series (it is commonly referred to as "metric pipe"). Its nominal dimension DN and outside diameter of the steel pipe are in accordance with those specified in Table 1.0.3.
The flanges adopting B series steel pipe shall be marked with "B" at the back of the number of nominal dimension DN for differentiation. However, the flange adopting A series steel pipe must not be marked with "A" at the back of the number of nominal dimension DN, for more details, see Chapter 13 and Chapter 14 of this Standard.
Foreword II
PN designated (European system) 1
HG/T 20592-2009 Stee1 Pipe F1anges (PN designated) 2
HG/T 20606-2009 Non-meta11ic F1at Gaskets for use with Stee1 Pipe F1anges (PN Designated) 138
HG/T20607-2009 PTFE Enve1ope Gaskets for use with Stee1 Pipe F1anges (PN Designated) 152
HG/T20609-2009 Metal Jacketed Gaskets for use with Steel Pipe Flanges (PN Designated) 159
HG/T 20610-2009 Spiral Wound Gaskets for use with Steel Pipe Flanges (PN designated) 166
HG/T 20611-2009 Covered Serrated Metal Gaskets for use with Steel Pipe Flanges (PN designated) 177
HG/T 20612-2009 Metallic Ring Joint Gaskets for use with Steel Pipe Flanges (PN designated) 187
HG/T 20613-2009 Bolting for Use with Steel Pipe Flanges (PN designated) 195
HG/T 20614-2009 Specification for Selection of Steel Pipe Flanges, Gaskets and Bolting (PN designated) 238
Class designated (American system) 260
HG/T 20615-2009 Steel Pipe Flanges (Class designated) 261
HG/T 20623-2009 Large Diameter Steel Pipe Flanges (Class Designated) 274
HG/T20627-2009 Non-metallic Flat Gaskets for Use with Steel Pipe Flanges (Class Designated) 374
HG/T20628-2009 PTFE Envelope Gaskets for use with Steel Pipe Flanges (Class Designated) 399
HG/T20630-2009 Metal Jacketed Gaskets for Use with Steel Pipe Flanges(Class Designated) 415
HG/T20631-2009 Spiral Wound Gaskets for Use with Steel Pipe Flanges (Class Designated) 429
HG/T 20632-2009 Covered Serrated Metal Gaskets for Use with Steel Pipe Flanges (Class Designated) 447
HG/T 20633-2009Metallic Ring Joint Gaskets for Use with Steel Pipe Flanges (Class Designated) 461
HG/T 20634-2009 Bolting for use with Steel Pipe Flanges (Class designated) 472
HG/T 20635-2009 Specification for Selection of Steel Pipe Flanges, Gaskets and Bolting (Class designated) 501
Wording Explanations 531
