Flange and gasket calculations

For calculating flanges, gaskets or bolts you may use several different LV programs varying from a simple and rough design to a complex and detailed calculation. The decision for a specific design code depends on the wishes of the final customer.

We recommend applying the DIN EN 1591. It may make sense using a simplified method, if not all gasket characteristics are available.

DIN V 2505

25V module

LV does not recommend applying this pre-standard. This standard has been withdrawn and the upper gasket seating is not considered. Several TÜV bodies (German inspection authorities), however, apply this standard.

DIN E 2505

2505 module

Detailed calculation of the gasket / flange complex. This standard is in the state of a draft.

DIN EN 1591

1591 module package

Detailed calculation, including all additional gasket calculations (e.g. mounting the gaskets, retorquing the bolts, gasket seating in operation, mounting and test state).

Advantage: Harmonized European Standard

Disadvantage: Additional gasket characteristics necessary (e.g. modulus of elasticity)

AD2000 Merkblaetter B7/ B8

AD 2000 / B 7 and B8 module

Similar to DIN V 2505, but not withdrawn. Limited application with welding-neck flanges


ASME module package

Calculation according ASME code.

Advantage : Grants a save flange design

Disadvantage: Upper gasket seating is not considered. Brings up big flange thickness.

DIN EN 13445 -3

EFL module package

Flange and gasket design per Taylor- Forge method

Advantage: Harmonized European Standard, easier to use than DIN EN 1591.

Disadvantage: Brings up big flange thickness.

DIN EN 12516-2

12516 module package

Calculating of valve shells including many options for calculating general pressure-loaded and several different flange types.

Advantage: most suitable for valve shells

Disadvantage: not suitable for piping and vessels

Overview I Home