Category A:
All longitudinal welds in shell and nozzles
All welds in heads, Hemisph-head to shell weld joint
Category B:
All circumferential welds in shell and nozzles
Head to shell joint (other than Hemisph.)
Category C and D are flange welds and nozzle attachment welds respectively
Longitudinal welds (Category A) are more critical than Circumferential welds (Category B) because they are under double stress.
This the reason why in different part of ASME code we have stringent rules in category A joint compared to category B joint.
Негізгі бет ASME sec 8 Pressure Vessel Joint efficiency & Radiographic Examination (RT-1,RT-2,RT-3,RT-4) Part -1
Пікірлер: 6