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Pipe Class Ratings vs. Pressure Numbers (PN)

Pressure numbers (PN) vs. flange class designations.

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Piping Class Ratings based on the ASME B16.5 - Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard - class and the corresponding ISO 7005 PN (Pression Nominal^*) ratings:

Flange Class	150	300	400	600	900	1500	2500
Flange Pressure Nominal (PN)	20	50	68	110	150	260	420

* "Pression Nominal" is the French equivalent of Pressure Nominal

"Pression Nominal" is the rating designator followed by a designation number indicating the approximate pressure rating in bars.

1 bar = 1x10⁵ Pa (N/m²) = 0.1 N/mm² = 10,197 kp/m² = 10.20 m H₂O = 0.98692 atm = 14.5038 psi (lb_f/in²)

PN ratings do not provide a proportional relationship between different PN numbers, whereas class numbers do. Class numbers are therefore recommended before PN ratings.

Note! The piping rating must follow the pressure-temperature rating of the weakest pressure containing item in the system.

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Related Topics

Pressure Ratings - Pressure ratings of pipes and tubes and their fittings - carbon steel , stainless steel, plastic, copper and more.
Codes and Standards - Piping codes and standards - ASME, ANSI, ASTM, AGA, API, AWWA, BS, ISO, DIN and more..

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