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recess type tube to tubesheet weld

RE: recess type tube to tubesheet weld

From past experiences with fired pressure vessel such as fire tube boilers, such weld is to seal from leak and is not is not considered a strength weld.

RE: recess type tube to tubesheet weld

212197, you can size the weld by use of either UW-20 or Nonmandatory Appendix A, once you have decided whether it is to be a strength weld, partial strength weld or a seal weld.

From the given detail, I'd guess a seal weld.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

RE: recess type tube to tubesheet weld

(OP)
As it seems to be seal weld, then expansion has to take the load & not the weld. In this case the expansion requirement is such that it shall not exceed 3 to 6% of wall thickness.
1.What would be the basis of 3 to 6 % permissible thinning?
2.How to design the tube to tubesheet expanded joint? Similar to UW 20 OF asme sec. VIII DIV 1 ,is there any code clause indicating the design formula?

RE: recess type tube to tubesheet weld

212197, without knowing the tube material, I'd say that is a pretty light roll, 5 -10 % is more common I'd say. Perhaps the material is subject to rapid work hardening?

I would again refer you to Nonmandatory Appendix A. With that light a roll, testing the joint may be in order, if it is subject to appreciable loading.

Regards,

Mike



The problem with sloppy work is that the supply FAR EXCEEDS the demand

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