49 CFR 172 Special Provision TP21 (TP-Codes)
These provisions apply to the transportation of hazardous materials in IM and UN Specification portable tanks.
| Code | TP21 |
|---|---|
| Description | The wall thickness must not be less than 8 mm. Portable tanks must be hydraulically tested and internally inspected at intervals not exceeding 2.5 years. |
| HazMat with this Code |