TABLE OF CONTENTS The examples in this part of Annex E are intended to illustrate the procedures of the gross plastic deformation design check, and to indicate modelling problems and solutions. Therefore, all examples deal only with individual load cases that are related to the GPD-DC, without consideration of completeness of the design checks.
The first example deals with a clad pressure vessel, for which in a pure DBF approach the nozzle moment is not permissible. The second deals with variants of the transition region of a cylindrical shell to a hemispherical one, illustrating the insight into a structure s behaviour gained by DBA investigations. The third example, a typical header of an air cooler (of rectangular cross-section), illustrates the safety margin due to plastification, and also the modelling problems of tubesheet to tube connections.
The fourth deals with a clad pressure vessel, with in a pure DBF approach non-admissible nozzle moment.
This example deals with one GPD load case of the upper part of a hydrocracking reactor shown in Fig. E.4.1-1. The objective is to check the admissibility of the design under pressure and the specified piping reactions at the nozzle, which are not admissible according to DBF. Therefore, only the upper part of the vessel is investigated, and, taking into account the symmetry of structure and actions, only one-half of the structure s upper part is modelled. The load case corresponds to one corner of the design domain,...
