currently I'm reviewing the mechanical design of an ASME III Class 2
Heat exchanger.
The designer proposes a fixed tubesheet configuration where the shell
and channel are groove welded to the tube-sheet according to the code
allowed weld details. Additionally, one of the supports of the
equipment (saddle supports) has been placed near the shell-channel-
tubesheet joint. The saddle support is attached to the rest of the
equipment using a reinforcement pad which takes the whole angle of the
saddle support. The pad is planned to be fillet welded in the whole
perimeter so this implies that the two horizontal pad welds cross the
circumferential welds of the tubesheet. In this scenario I haven't
found any provision concerning this question in the code. Could
anybody report to me any experience about if this configuration is
code allowed or not, and in the case that the configuration would be
OK, please send me any comments about the suitability of this design.
I'm afraid that the proposed detail could lead to fast fracture
failure due to triaxial stress states.
Thanks in advance.
Regards.
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