What does "outage" refer to in tank vehicles?

The term "outage" in the context of tank vehicles specifically refers to the empty space available within the tank that allows for the expansion of liquid. When liquids are transported, temperature changes may cause the liquid to expand or contract. By having this designated empty space, or outage, it helps to prevent spillage or overfilling, which can lead to hazards such as leaks or explosions.

In tank vehicle operations, it is essential to maintain this space to ensure safety and compliance with regulations. This concept is critical for drivers to understand, as it impacts how they load and transport hazardous materials. Understanding outage contributes significantly to safe hauling practices by ensuring that there is enough capacity to accommodate the natural expansion of the liquid being transported.