Piping Class Ratings - Classes and Pressure Numbers (PN)

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Piping Class Ratings based on ASME B16.5 and corresponding PN (Pression Nominal^*):

* 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.

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