Truck loading facilities enable the controlled transfer of liquid hydrocarbons from storage tanks to road tankers for distribution to downstream facilities or end users. The process begins with product withdrawal from the storage tank using transfer pumps, which deliver the liquid to the loading system at the required pressure and flowrate. Before loading, the product typically passes through a gas separator to remove entrained vapors or free gas that could affect measurement accuracy and safety. The liquid stream then flows through custody transfer metering systems, including master meters and provers, to ensure accurate quantity measurement and regulatory compliance.

During loading, displaced vapors from the truck are routed to a vapor recovery or vapor compression system, where they are captured and returned to the tank or processing system. This minimizes product loss, reduces emissions, and enhances safety. Truck loading operations require reliable monitoring to maintain product quality, protect equipment, and ensure safe handling. Typical monitoring objectives include contamination detection, moisture control, composition verification, and leak prevention.