46 C.F.R. § 153.981 Leaving room in tank for cargo expansion.
Title 46 - Shipping
The person in charge of cargo transfer shall ensure that the amount of cargo in a tank does not exceed the tank's capacity at any ambient temperature between −18 °C (approx. 0 °F) and 46 °C (approx. 115 °F).
Title 46: Shipping
PART 153—SHIPS CARRYING BULK LIQUID, LIQUEFIED GAS, OR COMPRESSED GAS HAZARDOUS MATERIALS
Subpart C—Operations
Cargo Transfer Procedures
§ 153.981 Leaving room in tank for cargo expansion.