DOT 4B, 4BA, 4B240ET or 4BW · water-jacket or direct expansion test · a water capacity over 5.44 kg (12 pounds)

For DOT 4B, 4BA, 4B240ET or 4BW, test or inspection is water-jacket or direct expansion test; condition or service qualifier is a water capacity over 5.44 kg (12 pounds); interval is by the end of 12 years after the original test date and at 12-year intervals theafter; regulation section is 49 CFR § 180.209, recorded from its source on 2026-08-06; source re-checked 2026-09-30.

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

Last verified against source: 2026-09-30. Due for re-check by 2027-09-30. This page as Markdown · OKF bundle · full dataset as JSON.