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Flange leakage check can be performed by equivalent pressure method Peq.

This is the addition of equivalent pressure and the maximum operating pressure. The result must be less than maximum allowable pressure on the flange.

Hence: Peq = 509296 x Mf + 127 x FA

G3 G2

Where,

Mf = Resultant Bending moment in daN in Operating conditions

FA = Axial force in daN in Operating conditions

G = Gasket diameters in mm

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