Which statement about the inert gas system is TRUE?

The statement that boiler soot blowers should never be used when the inert gas (IG) system is operating is accurate because the operation of soot blowers can introduce a risk of contamination. The inert gas system is designed to maintain a safe atmosphere in cargo tanks by limiting the presence of flammable gases and vapors, thus preventing explosions. When soot blowers are activated, they can displace the inert gas and potentially allow flammable vapors to mix with the IG, compromising the safety measures in place. Therefore, for maintaining optimal safety and integrity of the inert gas system, it is essential to avoid using boiler soot blowers while it is functioning, ensuring the inert atmosphere is preserved.

In contrast, other statements do not align with standard practices. For instance, an inert gas system can be operated while tanks are being cleaned, provided safety protocols are followed, and the system is properly vented. It is also not necessary to disconnect the IG system during cargo loading; it can be maintained during this operation to continue providing protection against fire. Finally, the inert gas system does influence cargo quality indirectly by preventing the formation of flammable atmospheres, but a well-functioning IG system does not compromise the quality of the cargo itself.