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>        If the tanks are NOT stamped DOT-3AA 2400 and instead have a
>pressure rating of 200 bar, they were not appoved by DOT
>for use in the USA. These tanks were made for sale and use outside
>the USA. Hydrostatic testing facilities are licenced by the DOT to retest
>only tanks that are approved by DOT.
>
As I recall, there's a bit in the DOT regs about testing foreign made tanks
that meet US standards, or some such jargon, that could be interpreted to
mean that, if you could demonstrate that the tanks complied with US
standards, it might be possible to hydro them here.
It's real long shot, but a very knowledgeable hydro shop might be able to
figure it out.
The relevent regs are in the CFR (Code of Federal Regulation), which can be
found in many larger libraries that are federal depositories.
Try vol. 49 or thereabout, sections 73.302 and 173.34 - 37.

And then, J.C.Whitney has cheap sets of marking dies :-)

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