Non-destructive testing
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Is color inspection required for Class B welds of nozzles smaller than 250 MM?
Flaw detection is determined by the requirements of the design drawings, not by the size of the pipe How can there be Class B welds on a 250mm pipe fitting?
In pressure vessels subjected to non-destructive testing in accordance with the design requirements: for connections with DN＜250mm, as well as long-neck flanges, surface inspection shall be carried out on the butt joints between connections. The most commonly used surface inspection methods are magnetic particle testing and penetrant testing. Magnetic particle testing is the preferred method for ferromagnetic materials, as it offers higher sensitivity to surface defects in these materials compared to penetrant testing. When magnetic particle testing cannot be used due to certain structural reasons, then penetrant testing can be employed instead.
Not necessarily; it depends on your requirements. If it’s a critical or vital area, then color flaw detection probably won’t work either – radiographic inspection will be necessary!
If designed in accordance with GB150, magnetic particle or penetrant testing should be carried out