Pressure Vessel Design: The Direct Route

Annex E.5: Examples of Progressive Plastic Deformation Design Checks

Annex E.5: Examples of Progressive Plastic Deformation Design Checks

Like in the preceding part E.4, the examples in this part are intended to illustrate the procedure, modelling problems, and solutions, in one specific design check, here the progressive plastic deformation design check, and all examples deal, therefore, only with individual load cases that are related to this PD-DC.

The first example, related to the first one in Annex E.4, E.4.1, is a complement to the NOLC 1.1 investigated there. The second example is a complement to the NOLC 1.1 investigated in Section E.4.3, and the third example is a complement to the investigation in Section E.4.4.

E.5.1: PD-DC of a hydrocracking reactor

This example deals with one PD load case of the upper part of the hydrocracking reactor, discussed in Section E.4.1, with geometry shown in Fig. E.4.1-1. With the cladding being integrally bonded and its nominal thickness being smaller than 10% of the related nominal component thickness, cladding is neglected in this load case, like in NOLC 1.1 of Section E.4.1.

Temperature changes are specified to be slow enough such that non-stationary thermal stresses need not be taken into consideration, but, nevertheless, nozzle forces and bending moment have to be considered as being independent of the temperature of the vessel.

Consequently, one cyclic action trajectory to be considered, in the following denoted by NOLC 2.1, has to pass through the zero action point and the following four action points, see also Table E.5.1-1, page 218.

Table E.5.1-1: Design values...

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