Under what condition do cargo transfer operations on a tank vessel NOT need to be stopped?

Cargo transfer operations on a tank vessel should be conducted with a clear understanding of safety and environmental protections. The correct choice indicates that operations do not necessarily need to stop when a tug comes alongside while loading grade D or E cargoes.

This is because grade D and E cargoes are categorized as less hazardous compared to other grades; therefore, their transfer might not impose immediate risks that would necessitate halting operations, especially when the vessel's stability and safety measures are in place.

In contrast, the other scenarios listed would typically require stopping operations due to elevated risks. For example, exceeding pressure limits can lead to overflow or structural failures, adverse weather conditions can create hazardous situations for both the crew and environment, and transferring hazardous materials requires stringent safety protocols that might mandate pausing operations to prevent potential spills or accidents.