(a) * * *
Table 1 to Paragraph (a) —Requalification of Cylinders1
| Specification under which cylinder was made | Minimum test pressure (psig)2 |
Requalification period (years) |
|---|---|---|
| 3 | 3000 psig | 5. |
| 3A, 3AA | 5/3 times service pressure, except non-corrosive service (see §180.209(g)) | 5, 10, or 12 (see §180.209(b), (f), (h), and (j)). |
| 3AL | 5/3 times service pressure | 5 or 12 (see §180.209(j) and(m)3). |
| 3AX, 3AAX | 5/3 times service pressure | 5. |
| 3B, 3BN | 2 times service pressure (see §180.209(g)) | 5 or 10 (see §180.209(f)). |
| 3E | Test not required | |
| 3HT | 5/3 times service pressure | 3 (see §§180.209(k) and 180.213(c)). |
| 3T | 5/3 times service pressure | 5. |
| 4AA480 | 2 times service pressure (see §180.209(g)) | 5 or 10 (see §180.209(h)). |
| 4B, 4BA, 4BW, 4B-240ET | 2 times service pressure, except non-corrosive service (see §180.209(g)) | 5, 7, 10, or 12 (see §180.209(e), (f), and (j)). |
| 4D, 4DA, 4DS | 2 times service pressure | 5. |
| 4E | 2 times service pressure, except non-corrosive service (see §180.209(g)) | 5, 10, or 12 (see §180.209(e)). |
| 4L | Test not required | |
| 8, 8AL | 10 or 20 (see §180.209(i)). | |
| Exemption or special permit cylinder | See current exemption or special permit | See current exemption or special permit. |
| Foreign cylinder (see §173.301(j) of this subchapter for restrictions on use) | As marked on cylinder, but not less than 5⁄3 of any service or working pressure marking | 5 (see §§180.209(l) and 180.213(d)(2)). |
1Any cylinder not exceeding 2 inches outside diameter and less than 2 feet in length is excepted from volumetric expansion test.
2For cylinders not marked with a service pressure, see §173.301a(b) of this subchapter.
3This provision does not apply to cylinders used for carbon dioxide, fire extinguisher, or other industrial gas service.
* * * * *
(e) Cylinders in non-corrosive gas service. A cylinder made in conformance with DOT Specifications 4B, 4BA, 4BW, or 4E protected externally by a suitable corrosion-resistant coating and used exclusively for non-corrosive gas that is commercially free from corroding components may be requalified by volumetric expansion testing every 12 years instead of every 5 years. As an alternative, the cylinder may be subjected to a proof pressure test at least two times the marked service pressure, but this latter type of test must be repeated every 10 years after expiration of the initial 12-year period. When subjected to a proof pressure test, the cylinder must be carefully examined under test pressure and removed from service if a leak or defect is found.
* * * * *
Need assistance?
Tried the LawStack mobile app?
Join thousands and try LawStack mobile for FREE today.
- Carry the law offline, wherever you go.
- Download CFR, USC, rules, and state law to your mobile device.
