The current flange standards are divided into two systems, namely PN series (European system) and Class series (American system).
The nominal pressure level of the PN series is represented by PN, including the following nine levels: PN2.5, PN6, PN10, PN16, PN25, PN40, PN63, PN100, and PN160.
The nominal pressure level of the Class series is represented by Class, including the following six levels: Class150, Class300, Class600, Class900, Class1500, and Class2500.
Because the pressure level itself should be infinite, it is just a different level standard. When exchanging, in addition to the conversion relationship between LB and MPa, the conversion relationship between LB and MPa must be considered, which is probably MPa=0.007×LB. LB and PN are pressure levels, not simple pressure units, that is, LB can be converted to MPa, but LB and PN cannot be easily converted.
The difference between the nominal pressure in HG/T20592-2009 and HG/T20592-97 flange standards.
Pressure conversion formula: 1 bar (bar) = 100000 Pascal (Pa) = 10 Newtons/square centimeter = 0.1MPa (MPa is megapascal) is a unit defined by the International Standards Organization.
The pressure in the HG/T20592-2009 flange standard is PN16, which is the same as the pressure PN1.6 in the HG/T20592-97 flange standard, which is what we usually call 16 kg pressure.
The nominal pressure in the 2009 edition is in bar, and the nominal pressure in the 1997 edition is in MPa, 16bar=1.6MPa.
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