JOINT EFFICIENCIES (ASME CODE)

JOINT EFFICIENCIES (ASME CODE)

Information data Joint Efficiencies (ASME Code). We can use this reference for design data in calculation and drawing project. We can learn data as below :

Notes :

1. In table C-2 joint efficiencies and allowable stresses for shell are for longitudinal seams only and all joints are assumed as Type 1 only.
2. “Part” radiography : Applies to vessels not fully radiographed where the designer wishes to apply a joint efficiency of 1.0 per ASME code, Table UW-12, for only a specific part of a vessel. Specifically for any part to meet this requirement, you must perform the following :

·        (ASME Code, Section UW (5)) : Fully X-ray any Category A or D butt welds.

·        (ASME Code, Section UW-11 (5)(b)) : Spot X-ray any Category B or C butt welds attaching the part.

·        (ASME Code, Section UW-11 (5)(a)) : All butt joints must be Type 1 or 2.

3. Any Category B or C butt weld in a nozzle or communicating chamber of a vessel or vessel part which is to have a joint efficiency of 1.0 and exceeds either 10-in. Nominal pipe size or 1-1/4 in. In wall thickness shall be fully radiographed. See ASME code, sections UW-11 (a)(4).
4. In order to have a joint efficiency of 1.0 for a seamless part, the Category B seam attaching the part must, as a minimum, be spot examined.