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# Head to Shell welding detail (taper transition)

## Head to Shell welding detail (taper transition)

(OP)
Dear All
In table 4.2.5 of ASME BPVC Sec.VIII-2 the detail for welding of a head to shell joint is illustrated. Detail number 4 & 5 are the cases when head is thinner than the shell. In these two cases there is a criterion which says:
a>=3b
I think that this needs a little clarification. The question is that can I taper the head from both sides with the ratio of 1/3 or if I want to taper from both sides the sum of the ratios has to be 1/3.
Suppose that I have a shell which is 10 mm thicker than the head. If my taper is from just one side, then it is clear that the taper length has to be at least 30 mm. Now if I want to taper from both sides can I give each side a chamfer of 5mm x 15mm and say that both tapers have the ratio of 1/3?
Warm Regards

### RE: Head to Shell welding detail (taper transition)

I do not have the code with me, so I will write from my experience.

The transition in your case is NOT cylindrical shell to cylindrical shell, so your approach is not easy to be used.

Hope this helps.

### RE: Head to Shell welding detail (taper transition)

Depending on the internal radius of the head that you come up for the transition, the head thickness may change slightly. If you are writing the minimum thickness on the head drawing, the change in the radius may change the minimum thickness.

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