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Figure UW-16.1 Cat. D joint design

Figure UW-16.1 Cat. D joint design

Figure UW-16.1 Cat. D joint design

(OP)
I have a vessel 2.5" thick, P1 Gr. 2, and I want to weld the manway, also P1 Gr. 2, in with a partial penetration joint, either details (i), (j), (k).

Concerns exist (not mine) that the void in this nozzle has pressure during the stress relief cycle. Applying the gas law, with a fixed volume:
P1 / T1 = P2 / T2
100,000 Pa / 293 K * 894 K = 305 000 Pa.

There is no way this pressure is detrimental to any of these welds.

Is there any experience out there pertaining to stress relieving partial penetration Cat. D welds?
No NDE is proposed, but MPI / LPI is probably a smart idea for quality assurance.

Thanks,

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