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Ans: The Joint Efficiency is determined in AutoPIPE Vessel following the rules of ASME Sec. VIII, Div. 1, UW 11, 12 AND 13.
Under Vessel Properties Window > Design Conditions tab the RT type is specified (Full/Spot/None) and also the joint type (Type 1/ Type 2).
So for a circumferential seem weld of shell which is a category B joint and with Full RT and Type 1 weld, the joint efficiency as per Table UW-12 should be 1, which is reported and used for calculation in the report:
Now if the degree of radiography is changed to "Spot" and the weld type changed to "Type 2", in the Design Conditions and recalculated, the calculations correctly update with joint efficiency = 0.8:
AutoPIPE Vessel also allows user defined joint efficiency input for longitudinal and circumferential welds: