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With the APY module you can design:
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It is assumed that a self-sealing gasket is used approximately in-line with the wall of attached pipe or vessel. The rules provide for hydrostatic end loads only and assume that the gasket seating loads are small and may in most cases be neglected. It is also assumed that the seal generates a negligible axial load under operating conditions. If such is not the case, allowance shall be made for a gasket load Hc dependent on the size and configuration of the seal and design pressure. Proper allowance shall be made if connections are subject to external forces or external pressure. The calculation of the flange stresses is performed by using the beam model. By considering the support function of the metal contact area, the flanges can be thinner than according ASME Appendix 2 or AD 2000.
The design method according appendix Y is allowed for ASME calculations and may be used as auxiliary model for calculations according AD 2000 or European standard EN, as there is no other design code at the moment. We recommend a consultation of the notified bodies to clarify if further verifications have to be performed.
| Flange class I, | A=16 in. = 406.4 mm, B = 10 in. = 254 mm, C = 14 in. = 355.6 mm, G = 11 in. = 279.4 mm, g0 = g1 = 0.375 in. = 9.525 mm, allowable stress Szul = 131 MPa, internal pressure P = 700 psi = 4.826 MPa |
Y1/Y2 = (A-B+g0)/(A-C+g0) = (406.4–254+9.525) / (406.4-355.6+9.525) = 162/ 60.3 = 2.7
Required flange thickness:
| according APY | according AD-B8 (with Y1/Y2=2.7) |
| t = 1.125 in. = 28.58 mm | t = 45 mm |
* Advantage: Depending on the specific conditions there can be a significant reduction of flange thickness compared to calculations according AD 2000 B7/B8 or ASME VIII standard.
