Differences and similarities between the PN series and Class series of steel pipe flanges
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Dear Haihao friends! Standard GB/T9124.1-2019 covers steel pipe flanges in two categories: the PN series and the Class series. The PN series has a pressure range of PN2.5 to PN400, with nominal sizes ranging from DN10 to DN4000. The Class series ranges from Class150 to Class2500, with nominal sizes from DN15 to DN600. So how is the level conversion between PN and Class handled? For example, what Class equivalent does PN2.5 correspond to? What Class equivalent is PN400?
PN is divided into Series A and Series B; Series B is the standard series in China and does not correspond well to CLASS. The correspondence between Series A and CLASS is as follows: PN 20, 50, 63, 110, 150, 260, 420 correspond to CLASS 150, 300, 400, 600, 900, 1500, 2500 respectively
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