DOT 4B, 4BA, 4B240ET or 4BW
For DOT 4B, 4BA, 4B240ET or 4BW, test or inspection is proof-pressure test; interval is by the end of 12 years after the original test date and at seven (7) year intervals; condition or service qualifier is a water capacity over 5.44 kg (12 pounds); regulation section is 49 CFR § 180.209, recorded from its source on 2026-08-06.
- Container specification
- DOT 4B, 4BA, 4B240ET or 4BW verified
- Test or inspection
- proof-pressure test our reading
- Interval
- by the end of 12 years after the original test date and at seven (7) year intervals verified
- Condition or service qualifier
- a water capacity over 5.44 kg (12 pounds) 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
For a cylinder having a water capacity over 5.44 kg (12 pounds), by the water-jacket, direct expansion or proof pressure test methods as prescribed in CGA C-1. For the water-jacket or direct expansion test, the requalification must be performed by the end of 12 years after the original test date and at 12-year intervals theafter. For the proof-pressure test, a requalification must be performed by the end of 12 years after the original test date and at seven (7) year intervals.
— law.cornell.edu, retrieved 2026-08-06
Source
- law.cornell.eduhttps://www.law.cornell.edu/cfr/text/49/180.209