49 CFR 172 Special Provision TP2 (TP-Codes)

These provisions apply to the transportation of hazardous materials in IM and UN Specification portable tanks.
Descriptiona. The maximum degree of filling must not exceed the degree of filling determined by the following:
tr is the maximum mean bulk temperature during transport,
tf is the temperature in degrees celsius of the liquid during filling, and α is the mean coefficient of cubical expansion of the liquid between the mean temperature of the liquid during filling (tf) and the maximum mean bulk temperature during transportation (tr) both in degrees celsius.
b. For liquids transported under ambient conditions α may be calculated using the formula: TP2b
d15 and d50 are the densities (in units of mass per unit volume) of the liquid at 15 °C (59 °F) and 50 °C (122 °F), respectively.
HazMat with this Code

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