08. Pressure vessel reports lc (sin alpha ) / r2 calculation which is apart of the Verification of buckling - DIN 18800 Part 4 - Lifting requirements to be unacceptable, why and what does it mean when using AutoPIPE Vessel?

Example of report:

Answer:

The first criteria in red (l_c (sin a ) / r₂ ) is a limit of application based on the unsupported length of conical shell (lc) and the apex angle (a) and the radius at the large base (r₂), it must be < 0.8 to met the code requirements. The unsupported length can be reduced in adding a stiffener.

The second criteria in red (vor U / zul U = 3 > 2) is a limit of application related to the out of roundness. By default vor U= 1.5%. As per the code zul U = 0.5% when Diameter > 1250 mm.

This ratio must be < 2 to met the code requirements.

The default value (vor U= 1.5%) can be reduced by user in Component properties Dialog (Out of Roundness field).

There is no alternative to DIN 18800 (buckling analysis method) currently implemented in APV.

Created by Mike Dattilio
When: Fri, Oct 14 2022 1:40 PM
Revisions: 1
Comments: 0

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