Problems with coil inspection in fermentation tanks
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Is RT testing required for the coiled tubes (Φ57×3.5, S30408) in the stainless steel fermenter (Class I), with cooling water as the medium? Is it possible to use alternative methods? Please explain the basis and source, thanks :)
Non-destructive testing is not required; GB/T150 does not specify such a test. Radiographic testing shall be carried out in accordance with GB/T151.
It is necessary to conduct a pressure test on the coiled tubes, while whether radiographic inspection of the welds is required depends on the design specifications; generally, it is advisable to perform inspection on at least 20% of the welds.
I might not have made myself clear; I was referring to the fact that, when designing the drawings, I couldn’t determine the method for inspecting these snake tubes, not during the manufacturing process
This image shows the technical requirements for our fermentation tanks; please refer to it