recess type tube to tubesheet weld

• Jun 4, 2017

• #2

chicopee

Mechanical

Feb 15, 2003

6,199

US

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.

 

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• Jun 4, 2017

• #3

SnTMan

Mechanical

Jan 22, 2005

6,862

US

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

 

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• Jun 7, 2017

• Thread starter
• #4

212197

Mechanical

Jun 2, 2007

124

IN

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?

 

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• Jun 7, 2017

• #5

SnTMan

Mechanical

Jan 22, 2005

6,862

US

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

 

Upvote 0 Downvote