What is the primary identifying feature of a MC338 tank?

The primary identifying feature of an MC338 tank is that it is designed with a tank within a tank structure. This design allows for the transportation of cryogenic liquids, such as liquefied natural gas or liquid oxygen, in a way that provides insulation and helps maintain the low temperatures needed to keep these substances in a liquid state. The inner tank contains the cryogenic liquid, while the outer tank provides a layer of insulation and structural support.

This design is particularly important because it minimizes the risk of heat transfer and prevents the cryogenic liquid from vaporizing. Additionally, it allows for the safe storage and transportation of materials that require extreme temperature controls, making it a critical feature for handling hazardous materials. Understanding the significance of this "tank within a tank" construction is vital for safety protocols and operational procedures in hazardous materials contexts.