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Flange & Gasket Load

A gasketed flange must satisfy two conditions: enough load to seat the gasket initially (Wm2), and enough to hold it sealed against the hydrostatic end force in service (Wm1). Bolt for whichever is larger.

Gasket reaction diameter G (mm)

Design pressure (MPa)

Effective seating width b (mm)

Gasket factor m

Seating stress y (MPa)

Allowable load per bolt (N)

Hydrostatic end force

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Operating load Wm1

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Seating load Wm2

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Governed by

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Required bolt load

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Bolts required

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ASME BPVC VIII-1 Appendix 2 form. m and y come from the gasket maker (compressed fibre ≈ m 2.75 / y 25.5 MPa; spiral wound ≈ m 3.0 / y 69 MPa). Torque them evenly in a star pattern.

A helper, not a substitute for engineering judgment. Verify against the governing standard.