Class C vertical steam boiler (P
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According to Table 4-1 of the Boiler Code and Table 7 on non-destructive testing ratios and methods for shell boilers (page P146), for Class C boilers with a pressure of P ≤ 0.8 MPa, the inspection ratio for the welds at the joints of the boiler heads should be 20% or more. However, according to the standard GB/T21598 for boiler heads, 100% inspection of those welds is required. These two requirements are contradictory; which ratio should be followed? Could the master please help?
The strictest standards shall be applied; in accordance with the standard GB/T21598 for end caps, the welds at the joints of these end caps must undergo 100% flaw detection.