Non-destructive testing requirements for butt welds of nozzles and flanges with a nominal diameter of 250 or above

2021-12-22View Original

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For butt welds of nozzles and flanges with a nominal diameter of 250 or above, 100% RT inspection is required. Should we apply Class II acceptance criteria, or Class III acceptance criteria? Provided that this is not specified in the drawings.

Reply #22021-12-22

This should be the same as the acceptable grade for the cylinder

Reply #32021-12-22

Same as for Type A and Type B welded joints in the drawings

Reply #42021-12-22

The inspection ratio and acceptance level for this circumferential weld are the same as those for Class A and B joints in the equipment it’s part of; thus, a 100% inspection is unnecessary

Reply #52021-12-22

The welding joint coefficient is 1; it is classified as Grade II； The welding joint coefficient is 0.85; it is classified as Grade III

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Non-destructive testing requirements for butt welds of nozzles and flanges with a nominal diameter of 250 or above

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