Inspection issues
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I have a storage tank with a diameter of 2000 mm; it has no manholes, only an ultrasonic flaw detector, the largest of which is a circumferential flaw detector with a capacity of 300. I would like to know whether it is possible to inspect the final ring welds of the tank body and the head. Exactly how to do it.
What a difficult question. I think you’ll have to go find a gamma source for testing.
There seems to be a problem with the design; how will the circumferential seam be welded in the end? One-sided welding for double-sided formation? The quantity is a bit too large; how can the quality be ensured? It’s better to add individual holes; it won’t cost much more. The costs related to inspection and repair are also not that high.
As a supplementary note, if it’s not possible to install manholes from a technical standpoint, a recordable ultrasonic detector can be used instead.
Yes, let’s discuss with the supervision team to see if the ultra-sound inspections that can be recorded are acceptable Another solution: 1. What is the wall thickness? Is it possible to use this flaw detector for double-layer inspection multiple times? 2. If that still doesn’t work, make small holes in the head and perform gamma testing. After passing the inspection, it is sealed off by a threaded plug.
Gaskets can be added on the head side, with TIG welding for the root pass and submerged arc welding for the cover pass.
If there are no manholes either, it is difficult to inspect the circumferential welds of the final cylinder section and head using a 300-type ultrasonic flaw detector; ultrasonic waves with higher frequency can be used for inspection.
Using TIG welding for the root pass of the final weld also corresponds to a fully penetrative double-sided welding method, which helps ensure the quality of the weld! Of course, flaw detection is still necessary!
As far as I know, in the owner’s situation, radiation therapy is not possible; try ultrasound instead! If that doesn’t work, discuss it with the Special Inspection Agency, hear their opinions, and find a solution!
I think ray inspection is also not possible; recordable ultrasonic testing can be used instead.