# DOT-8 series — How often hazmat cylinders, cargo tanks, IBCs and portable tanks must be retested

For DOT-8 series, test or inspection is Shell (visual inspection) requalification; interval is 10 years; condition or service qualifier is On or after January 1, 1991; regulation section is 49 CFR § 180.209, recorded from its source on 2026-08-06.

- **Container specification:** DOT-8 series _(verified: appears in the quote below)_
- **Test or inspection:** Shell (visual inspection) requalification _(our reading, not quoted from the source)_
- **Interval:** 10 years _(verified: appears in the quote below)_
- **Condition or service qualifier:** On or after January 1, 1991 _(verified: appears in the quote below)_
- **Regulation section:** 49 CFR § 180.209 _(verified: appears in the quote below)_

## What the source says

> Each owner of a DOT-8 series cylinder used to transport acetylene must have the cylinder shell and the porous filler requalified in accordance with CGA Pamphlet C-13 (IBR, see <https://www.law.cornell.edu/cfr/text/49/171.7> § 171.7 of this subchapter). Requalification must be performed in accordance with the following schedule: Date of cylinder manufacture | Shell (visual inspection) requalification | Porous filler requalification | Initial | Subsequent | Intial | Subsequent | Before January 1, 1991 | Before January 1, 2001 | 10 years | Before January 1, 2011 | Not required. | On or after January 1, 1991 | 10 years 1 | 10 years | 5 to 20 years 2 | Not required.

## 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/).