How are RT and PT determined in the pipe inspection column of the pipeline table?
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May I ask how the methods for pipeline inspection are determined? I have checked GB20225 (which is now obsolete), GB3501 (also now obsolete); neither GB50325 nor GB50184 specifies under what circumstances penetrant testing should be used or when radiographic testing is appropriate. GB50184 lists the inspection grades for welds, but it does not indicate when PT or RT should be employed
Refer to Table 9.3.1 in GB 50517; select the appropriate non-destructive testing methods and their application ratios based on the pipeline category
This post was last edited by Lübajiao on 2023-3-31 at 17:10. To add further, the method of flaw detection depends on whether the project follows the standards for industrial metal pipelines (GB50184) or those for petrochemical metal pipelines (GB50517/SH3501)； The poster is inquiring about the industrial standard GB50184, which also specifies the inspection methods. For details, see: “8.2.1 Unless otherwise specified in the design documents, the butt longitudinal and circumferential seams of pipes and pipe components welded on-site, as well as the welds used to connect branch pipes in a butt manner, shall be inspected using radiographic testing or ultrasonic testing...” – “Radiographic testing or ultrasonic testing” refers to RT/UT. “8.3.1 Unless otherwise specified in the design documents, the socket weld seams of pipes and pipe components welded on-site, the welds used to connect branch pipes (other than those in a butt manner), the welds used for reinforcement, the sealing welds, the welds connecting supports and pipes, as well as other fillet welds on the pipes, shall have their surfaces inspected using magnetic particle testing or penetrant testing.” ……”——"Magnetic particle testing or penetrant testing, i.e., MT/PT. My previous reply cited the petrochemical standard GB50517.