DOT-3AL cylinders manufactured of 6351-T6 aluminum alloy · requalified and inspected for sustained load cracking · used in self-contained underwater breathing apparatus (SCUBA), self-contained breathing apparatus (SCBA), or oxygen service

For DOT-3AL cylinders manufactured of 6351-T6 aluminum alloy, test or inspection is requalified and inspected for sustained load cracking; condition or service qualifier is used in self-contained underwater breathing apparatus (SCUBA), self-contained breathing apparatus (SCBA), or oxygen service; 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

DOT-3AL cylinders manufactured of 6351-T6 aluminum alloy. In addition to the periodic requalification and marking described in § 180.205, each cylinder manufactured of aluminum alloy 6351-T6 used in self-contained underwater breathing apparatus (SCUBA), self-contained breathing apparatus (SCBA), or oxygen service must be requalified and inspected for sustained load cracking in accordance with the non-destructive examination method described in the following table.

— 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.