What can be a consequence of not using an inert gas system in tankers?

The heightened risk of explosion in cargo tanks is a serious consequence of not employing an inert gas system in tankers. Inert gas systems are designed to minimize the formation of flammable vapors within cargo tanks by replacing the oxygen present with inert gases, typically nitrogen or flue gas. This reduction of oxygen limits the possibility of combustion and helps prevent explosions, especially in the presence of volatile cargo.

When an inert gas system is not used, the cargo tanks can retain a mixture of flammable vapors and atmospheric oxygen, creating an environment where any ignition source can lead to catastrophic explosions. Therefore, the absence of such a system significantly increases the safety hazard on board, risking not just the vessel and cargo, but also the safety of personnel and the marine environment.

The other options do not relate to the safety implications of not using an inert gas system. Increased speed, reduced cargo loading time, and lower operational costs might be misleading benefits but do not address the critical danger posed by flammable gases in cargo tanks.