Issues related to non-destructive testing per GB/T150-2024
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Article 10.3.2 of 150.4, regarding the areas within a vessel that require 100% inspection during local testing, item e) covers \"joint connections between pipes with a nominal diameter DN of 250 mm or more, as well as joint connections between pipes and flanges.\" According to these regulations, does that mean all large nozzles of pressure vessels must undergo 100% inspection?
Yes, there is no change; it was done this way before as well
Yes, in accordance with the requirements of GB/T150-2024, 100% non-destructive testing is required for all pipe connections with a nominal diameter DN of 250 mm or more, as well as for the joints where pipes are connected to flanges. .
In previous versions, it was stipulated that only those nozzles subjected to external loads were required to undergo 100% non-destructive testing; does this requirement now apply to manholes as well?
Both the 89 version and the 98 version are like this; the 2011 version includes external loads, while the 2024 version removes those external loads
Based on the information you provided, it is indeed true that under the new GB/T150-2024 standard, for fittings with a nominal diameter of DN 250 mm or more, regardless of whether they are subject to external loads or not, including those at manhole connections, 100% non-destructive testing is required. These are stricter requirements compared to previous versions. .
Follow the standards! The cost has increased, but the security level has improved
This post was last edited by Zhang Junli on 2025-3-11 at 18:15. 100% Category B stitching – any questions?
In fact, this approach is unreasonable – the circumferential welds of pipes with a nominal diameter of 250 mm or more are inspected 100%, while only the longitudinal circumferential welds of containers are subject to partial inspection; in the event of an accident, this increases the risk even further. Additionally, can the circumferential weld of the cylinder be considered as a butt weld between pipes with a nominal diameter greater than 250?
Yes, whether it’s the code requirements or standard 150, we’ve struggled with this issue several times; to this day we still don’t know which is more important compared to the main welds!