Once the equipment arrives at the site, how can one check whether the manufacturer has performed radiographic non-destructive testing on it?
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This post was last edited by jmdc on 2019-5-28 at 18:17. Once the equipment arrives at the site, how can one check whether the manufacturer has performed radiographic non-destructive testing on it? It seems impossible to verify this; the records might be fabricated, and the films attached randomly could also be from other devices used to deceive people. Radiographic testing does not leave any traces on the welds, so it’s not possible to detect anything just by looking at them. Unless the user conducts radiographic testing on all the welds themselves to see whether they meet the standard requirements The user doesn’t have any testing equipment either
Do users need to take responsibility for whether testing is carried out or not?
There really is no way around this, unless the entire production process is under constant supervision and monitoring, or inspection points are established. Reputable manufacturers are also afraid of problems arising, as the repair costs would be too high. So normal non-destructive testing won’t miss anything, so there’s no need to worry too much about that.
When the goods arrive at the site, it indicates that the manufacturer has approved those products for release, meaning the manufacturer is now responsible for them; it’s definitely impossible to determine whether radiation testing was performed or not. To know what’s going on and whether the manufacturer is producing as required, it is necessary to have manufacturing supervisors on site to oversee the process.
Ask the manufacturer to connect with you during the non-destructive testing and show it to you live.:lol
The last edit to this post was made by wanlirn on 2019-5-29 at 10:49. There are films that can be replicated; anyone with a viewing light (even sunlight will do) can reproduce each film exactly as it was, with the images in their proper positions； From the film, it’s possible to see the shape of the weld; if it doesn’t match, then the film is fake. If the manufacturer claims to have used RT testing and then sands the weld, it’s still considered a fake film. Supervisors do this as well. In most cases, the equipment is shipped without the film attached to it. There are other hidden issues as well – you haven’t mentioned them, have you? ；
Non-destructive testing leaves no traces.
The manufacturer can be asked to provide a test report
The supervision and inspection of pressure vessel manufacturing is carried out by the quality supervision department in the supplier’s location; otherwise, the vessels are not allowed to leave the factory. As you said, the situation where suppliers and inspection departments collude to fabricate data does exist in theory, but it is rare in practice. If things go wrong...
The standards require that the X-ray inspection films be retained by the manufacturer throughout the design life cycle of the equipment, so as to enable accountability. The cost of flaw detection is very low; for things that are required by standards, no one wants to take responsibility, but legitimate manufacturers are willing to carry out this task.
This is generally not visible. The factory documentation should include non-destructive testing reports; if such testing is not carried out, the manufacturing unit and the inspection agency are liable under the law. Under normal circumstances, one wouldn’t dare to do such a thing. If the user has doubts, they can do it again. For some devices, it is not ruled out that the manufacturers may engage in fraud to cut costs, and the inspection agencies fail to detect this due to negligence. In most cases, the discrepancy is mainly due to mixed-up information. Upon discovering any issues, they should report them to the local oversight authorities immediately; for matters of doubt, local testing agencies can be consulted for clarification, and absolutely no action will be taken to ignore such problems.