Regarding the issue of the number of non-destructive testing inspections for circumferential butt joints in pressure pipelines

2021-11-01View Original

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Dear Haihao friends, regarding GB/T 20801 Part 5, section 6.3.2.1 a), as shown in the figure below, I have a question. The text states that \"sampling inspections shall be carried out according to the proportion in Table 1, based on the number of circumferential butt joints.\" For example, if a project involves 10 pipelines and the radiographic inspection rate is 5%, does this 5% apply by multiplying the number of circumferential seams per pipeline by 5%, or should the total number of circumferential seams across all 10 pipelines be calculated first before multiplying by 5%? There is no clear specification in the standards either. Anyone who has experience with the inspection of pressure pipelines, please share your insights. Thank you in advance!~

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Regarding the issue of the number of non-destructive testing inspections for circumferential butt joints in pressure pipelines

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