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

For DOT 3A or 3AA, test or inspection is Periodic requalification; interval is every ten years instead of every five years; condition or service qualifier is removed from any cluster, bank, group, rack, or vehicle each time it is filled; regulation section is 49 CFR § 180.209, recorded from its source on 2026-08-06.

- **Container specification:** DOT 3A or 3AA _(verified: appears in the quote below)_
- **Test or inspection:** Periodic requalification _(our reading, not quoted from the source)_
- **Interval:** every ten years instead of every five years _(verified: appears in the quote below)_
- **Condition or service qualifier:** removed from any cluster, bank, group, rack, or vehicle each time it is filled _(verified: appears in the quote below)_
- **Regulation section:** 49 CFR § 180.209 _(verified: appears in the quote below)_

## What the source says

> A cylinder conforming to specification DOT 3A or 3AA with a water capacity of 56.7 kg (125 lb) or less that is removed from any cluster, bank, group, rack, or vehicle each time it is filled, may be requalified every ten years instead of every five years, provided the cylinder conforms to all of the following conditions:

## 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/).