Calculation of flanges and flange connections according to DIN EN 1591 and
DIN EN 13445-3 (Woelfel method)

The calculation program from Lauterbach Verfahrenstechnik GmbH contains the complete calculation specification according to DIN EN 1591-1 or the corresponding section of DIN EN 13445 3/G and enables the calculation of weld-on, weld-on, blind and loose flanges.

The calculation method takes into account the elasticity of the connected shell, the thermal expansion between flange and bolts and the effective gasket surface and calculates the required assembly torque for the bolts. In order to evaluate the load cases, the loads for flange, bolts, gasket and loose flange are determined.

Torque key (with or without measuring device). This allows the tightness of a flange connection to be tested in practice under various load conditions. A flange connection mounted with a torque wrench, for example, requires lower bolt forces than when tightened by hand. The utilization of the flange connection decreases accordingly.

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By integrating the modules 1092, SFLA, VFLN, 1514N, 269X, AFLT and 159N, the required data on flange, bolt and gasket geometry as well as the gasket characteristics of all gasket materials according to DIN EN 1591-2 can be retrieved from the stored tables. After entering the nominal diameter, the nominal pressure and, if applicable, the operating temperature, the data on the flange and gasket geometry from the tables included are directly available in the flange calculation (module 1591).
The temperature-dependent gasket characteristics for all gaskets according to part 2 of DIN EN 1591 are also included.

Significant advantages compared to the previous calculation regulations according to AD / ASME are the consideration:

  1. of the non-linear elastic behaviour of the gasket
  2. the forces from different thermal expansions of the flange and bolts
  3. of additional external axial forces and moments
  4. of the influence of the number of assemblies on the gasket or the tightness of the joint
  5. of the elastic support effect due to the connected shell
  6. of the tensioning of bolts, flange and gasket when calculating the loads
  7. of several consequential load conditions Operation, testing and assembly in the calculation of the bolt torque
  8. of more accurate calculation models for the elastic behaviour of flange, bolts, shell and gasket.

The tightening method can be taken into account in the calculation (e.g. with wrench, impact wrench, torque wrench with or without measuring device). This allows the tightness of a flange connection to be tested in practice under various load conditions. A flange connection mounted with a torque wrench, for example, requires lower bolt forces than when tightened by hand. The utilization rate of the flange connection decreases accordingly.

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