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D.O.T. vs ISO/US stamped gas cylinders.

General welding questions that dont fit in TIG, MIG, Stick, or Certification etc.

D.O.T. vs ISO/US stamped gas cylinders.

Postby TheJDMan » Mon Jul 10, 2017 5:50 pm

Can anyone tell me what the difference is between a D.O.T. vs ISO/US marked cylinder and why? My LWS told me that they will not refill a cylinder if it is not D.O.T. stamped.
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Re: D.O.T. vs ISO/US stamped gas cylinders.

Postby Poland308 » Mon Jul 10, 2017 10:25 pm

Technicality. There probably covering there legal butt. If they take it in and have to ship it out to retest the tank then they take the risk of getting dinged by the dot. It's an excuse some places use to keep from having to take in tanks that aren't there's.
I have more questions than answers

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Re: D.O.T. vs ISO/US stamped gas cylinders.

Postby Otto Nobedder » Tue Jul 11, 2017 4:58 pm

If it's not got an approved DOT stamp, it's illegal to transport it once it's refilled. It's a "one-time use" or a "fill on site" cylinder without the DOT stamp.

The DOT has specific retest requirements and standards that must be met to transport them on public roadways.

Same for the vessels I work on. Every five years, I retest them for DOT certification (Also valid in Canada.)

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