How to determine whether a pipeline has been inspected for defects
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Basically as the title suggests, I discovered today that fraud was involved in the testing processes during construction. Of course, I couldn’t tell where the fraud lay… Does testing leave any traces behind? I would appreciate it if everyone could share their insights! Additionally, what kind of pipes require a stainless steel underlayer? Is there anything unnecessary?
Is pipeline flaw detection performed? Flaw detection does not leave any traces. To ensure quality, it is necessary to implement strict checks at each stage.
2# zx9527007 Oh, a pipe was installed there several days ago already, and then the supervisor suddenly came up saying that the flaw detection results were fake. I thought there would be some signs... Honestly, I really don’t understand these supervisors; sometimes they clearly side with the construction party, while other times they find faults for no reason at all. As a low-ranking employee of the owner, I’m very confused. Hehe
For RT and UT, only the reports can be viewed; PT shows traces. Personally, I think being a supervisor isn’t a good job – it’s impossible to please both sides
To determine whether pipeline flaw detection is required, one should first consult the design documents; the design will take into account factors such as standards, requirements related to the process medium, and industry regulations when deciding on the extent of flaw detection and sampling. If the design documents do not specify anything, the general requirements outlined in GB50235/50236 or other relevant standards can be referred to. Regarding the base coating for stainless steel, TIG welding should be used for the base layer. The flaw detection is not accurate; this can be seen from the film.
The main focus is on strengthening supervision; flaw detection does not leave any marks on the pipes； The supervisor said that the flaw detection results were fake; it seems we ran into a foolish fraudster. Films with two or more welds turn out to be identical. Just as we sometimes can’t tell whether money is genuine or fake, those with the same serial number are definitely fake
It depends on what type of inspection it is. But no matter what the type of inspection, it needs to be carried out as soon as possible; if too much time passes, it will indeed be impossible to detect anything
Color flaw detection leaves a trace, while ultrasound does not. Radiographic flaw detection uses film, and markings are applied during the process; these markings correspond to those on the film. The inspection results are usually filed with the Technical Supervision Bureau, and fraud is generally not committed.
All flaw inspections must be documented, and the supervisor must sign to approve them.
Inspection is carried out by the contractor in collaboration with the supervisor after the construction is completed; it is documented, and all that needs to be done is to check those records. If the flaw inspection was done not long ago, there are still marks at the location of the inspection.
Do they dare fake flaw detection too? ! Something unimaginable. Inspection should be accompanied by corresponding records and reports, which must be signed and approved by supervisors and other relevant personnel.
Inspection results are recorded and reported by oneself, leaving no trace. It is mainly the owner and supervisor who need to strengthen oversight in this regard; when such situations are detected, stricter penalties must be imposed. With proper management, many problems can be identified during the inspection process. If the welding quality of the construction party is poor, then difficult times lie ahead. I have seen such situations before – the site was in a terrible condition, with everywhere seals used to stop leaks under pressure.
Thank you all for your discussions. The fraud occurred last time on one weld, which was inspected twice; it was considered an unqualified weld as a result