Non-destructive testing
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When the nominal diameter of the pipe is less than 500 mm, sampling inspections can be carried out according to the inspection ratios in Table 1 based on the number of circumferential butt joints, with no fewer than 1 circumferential butt joint required. Any circumferential butt joint that is to be tested shall include its entire circumferential length. The sampling inspection rate for circumferential butt joints welded in place shall be no less than 40% of the total number of joints to be inspected ； Among them, \"any circumferential butt joint that is subject to testing shall cover its entire circumferential length.\" ”How should this be understood? Does it mean that 100% non-destructive testing is required?
Does this sentence mean that during inspection, one should not limit oneself to checking just one area of all the circumferential butt weld joints, but rather select a random section along the perimeter for inspection?
Yes, what this sentence means is that when performing non-destructive testing on circumferential butt joints, testing should not be carried out only in one area; rather, it must be done along the entire perimeter of the joint, and a certain proportion of joints need to be selected for testing. Specifically, when conducting sampling inspections on circumferential butt joints of pipes with a nominal diameter of less than 500 mm, a section whose length covers the entire circumference should be selected, and inspections should be carried out at the proportions specified in Table 1. The sampling inspection ratio for circumferential butt joints welded in place shall be no less than 40% of the total number of inspections. .