Regarding the proportion of flaw detection for pressure pipelines, I would appreciate some guidance from experts
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A certain steam pipeline was designed in accordance with industrial piping standards. The drawings specify that 10% of the pipeline should be inspected for defects. This pipeline has a diameter of 108 mm, with 20 butt welds and 5 socket welds. For pipelines with a diameter of 38 mm, there are 15 butt welds. What is the correct calculation method? Option A: 20*10%; Option B: (20+5)*10%; Option C: (20+5+15)*10%. Which one is correct? Welder coverage and fixed joints are not taken into consideration
Calculation method C is correct. According to the description in the question, the diameters of the steam pipelines are 108 and 38; there are 20 butt welds and 15 socket welds respectively, with 5 plug welds. The drawing indicates that the flaw detection ratio is 10%. Calculation Method A suggests that the calculation should be based on the number of butt welds, that is, 20*10% = 2 flaw inspections. Method B for calculation suggests that the number of butt welds and socket welds should be added together, that is, (20+5)*10% = 2.5 inspection tests. Calculation method C takes into account the total number of all types of welds, that is, (20+5+15)*10% = 4 flaw inspections. Without considering the issues of welder coverage and fixed openings, Method C should be used for calculations; that is, 4 flaw detections are required to meet the 10% detection ratio requirement. .