What is the primary purpose of inert gas systems aboard tank vessels?

The primary purpose of inert gas systems aboard tank vessels is to prevent outside air from entering the tank. Inert gas systems work by displacing oxygen in the cargo tanks with an inert gas, such as nitrogen. This is critical because the presence of oxygen can lead to explosive environments when volatile cargoes are transported. By maintaining an inert atmosphere in the tanks, the system significantly reduces the risk of fire and explosion, ensuring the safety of the vessel, crew, and the environment.

Cargo tanks must be kept at a level of inert gas to minimize the risk of combustion, particularly during loading and unloading operations. The gases are typically generated onboard through combustion processes or by using stored gas and are injected into the cargo tanks while maintaining pressure. This involves a continuous monitoring process to ensure that the atmosphere remains safe throughout the voyage and cargo operation.

In contrast, the other options do not encapsulate the primary function of inert gas systems:

• While water for firefighting is important for safety, it is not the primary function of inert gas systems, which specifically target oxygen displacement.

• Enhancing fuel efficiency is not a primary purpose of inert gas systems. These systems are more concerned with safety rather than fuel management.

• Controlling cargo temperature is related to the management of