49 CFR 172 Special Provision TP19 (TP-Codes)

These provisions apply to the transportation of hazardous materials in IM and UN Specification portable tanks.
DescriptionThe calculated wall thickness must be increased by 3 mm at the time of construction. Wall thickness must be verified ultrasonically at intervals midway between periodic hydraulic tests (every 2.5 years). The portable tank must not be used if the wall thickness is less than that prescribed by the applicable T code in Column (7) of the Table for this material.
HazMat with this Code

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