Your problem is that you are designing a vessel according to ASME (which is a non-harmonized code)and want to also certify it according to PED.
Although according to PED annex I, para. 7.4 (which is a law and cannot be avoided in the EU) the test pressure is the maximum of:
-"that corresponding...
I would suggest that you avoid ENiCrMo-3 since the weld metal is succeptible to embtittlement in the temperature range between 650 - 800C (1200-1560F).
A better solution would be a ENiCrFe-3 since it is insucceptible to embrittlement.
