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

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

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

## What the source says

> 3HT | 5/3 times service pressure | 3 ( see <https://www.law.cornell.edu/cfr/text/49/180.209#k> §§ 180.209(k) and 180.213(c)).

## 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/).