Pressure pipelines: Material – carbon steel. Are weld inspections required for non-toxic and harmless fluids?
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I encountered a problem at work regarding steam pipes: the material is carbon steel, with a DN100 size, and the design temperature is 180°C for saturated steam. According to GB50184, such pipes do not require flaw detection. In accordance with clause 6.1.5 of Part 5 of GB20801, except for GC3-class pipes, carbon steel pipes with a nominal pressure not exceeding DNPN50 have an inspection grade of IV (5% flaw detection). So, if we consider things strictly, should flaw detection be carried out at a rate of 5%?
In accordance with the inspection requirements of GB/T20801-2020, 5% weld non-destructive testing is required for this pipeline.
Reply: After discussion, testing will be carried out at 5%