What common feature do non-pressure liquid cargo tanks (MC 306/DOT 406) possess?

Non-pressure liquid cargo tanks, commonly referred to as MC 306 or DOT 406 tanks, typically have an oval-shaped design. This design feature is significant because it aids in the stability of the tank when transporting liquids, particularly when making turns or navigating through various terrain. The oval shape allows for efficient loading and unloading while also contributing to the overall structural integrity when filled with liquid.

These tanks are specifically designed for the transport of non-hazardous liquids or low-hazard materials, and while they may have varying shell configurations, the oval shape is characteristic of their design. Understanding the shape and structure of these tanks is crucial for firefighters and hazmat responders, as it influences how they manage incidents involving these types of cargo tanks.

Other features associated with non-pressure liquid cargo tanks include the fact that they are not designed to withstand high internal pressures, which distinguishes them from pressure tanks designed to carry gases or other substances under pressure.