# 3A, 3AA — How often hazmat cylinders, cargo tanks, IBCs and portable tanks must be retested

For 3A, 3AA, test or inspection is Periodic requalification; interval is 5, 10, or 12; minimum test pressure is 5/3 times service pressure, except non-corrosive service; regulation section is 49 CFR § 180.209, recorded from its source on 2026-08-06.

- **Container specification:** 3A, 3AA _(verified: appears in the quote below)_
- **Test or inspection:** Periodic requalification _(our reading, not quoted from the source)_
- **Interval:** 5, 10, or 12 _(verified: appears in the quote below)_
- **Minimum test pressure:** 5/3 times service pressure, except non-corrosive service _(verified: appears in the quote below)_
- **Regulation section:** 49 CFR § 180.209 _(verified: appears in the quote below)_

## What the source says

> 3A, 3AA | 5/3 times service pressure, except non-corrosive service ( see <https://www.law.cornell.edu/cfr/text/49/180.209#g> § 180.209(g) ) | 5, 10, or 12 ( see <https://www.law.cornell.edu/cfr/text/49/180.209#b> § 180.209(b) , (f), (h), and (j)).

## Source

- https://www.law.cornell.edu/cfr/text/49/180.209

Last verified: 2026-08-06. Review by: 2027-08-06.
Part of [How often hazmat cylinders, cargo tanks, IBCs and portable tanks must be retested](https://referencesource.org/hazmat-container-retest-intervals/).