DOT Specifications 4B, 4BA, 4BW, or 4E
For DOT Specifications 4B, 4BA, 4BW, or 4E, test or inspection is volumetric expansion testing; interval is every 12 years instead of every 5 years; condition or service qualifier is protected externally by a suitable corrosion-resistant coating and used exclusively for non-corrosive gas that is commercially free from corroding components; regulation section is 49 CFR § 180.209, recorded from its source on 2026-08-06.
- Container specification
- DOT Specifications 4B, 4BA, 4BW, or 4E verified
- Test or inspection
- volumetric expansion testing our reading
- Interval
- every 12 years instead of every 5 years verified
- Condition or service qualifier
- protected externally by a suitable corrosion-resistant coating and used exclusively for non-corrosive gas that is commercially free from corroding components verified
- Regulation section
- 49 CFR § 180.209 verified
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
A cylinder made in conformance with DOT Specifications 4B, 4BA, 4BW, or 4E protected externally by a suitable corrosion-resistant coating and used exclusively for non-corrosive gas that is commercially free from corroding components may be requalified by volumetric expansion testing every 12 years instead of every 5 years.
— law.cornell.edu, retrieved 2026-08-06
Source
- law.cornell.eduhttps://www.law.cornell.edu/cfr/text/49/180.209