UG 34, E= Joint efficiency from table UW-12 of any cat A weld.

Fig UW 13.2- Attachment of pressure parts to flat plates to form a corner joint.

If it is considered as corner joint (as per fig UW 13.2), we can consider JE as 1 in line with UW table UW 12, note 5 without doing any radiographic examination.

As per UG 34, it calls for cat A weld where JE can vary depending on extent of radiography.

Please advise what JE is to be considered if no radiography is carried out and the joint configuration is as per any of the proposed configuration in fig UW 13.2.

Regards

In general, a corner joint that is not radiographable does not affect the joint efficiency of the joined components.

The flat welded cover itself is designed to rules of UG-34. UW-3(a) specifies that a joint within a flat head is a Category A joint. UG-34(a) defines the joint efficiency to be used in the head thickness calculation as "joint efficiency of any Category A weld" in the head.

Thus, if there are any butt welds in the flat cover because it is not fabricated from a single piece of plate material, then the joint efficiency of those "splice" welds must be considered in the thickness calculation. But if the flat cover is seamless, then the joint efficiency for the thickness calculation is "1".