What should the cross-connection valve setting be when tanks are partially or fully loaded with dry cargo?

When tanks are partially or fully loaded with dry cargo, the cross-connection valve should be open to facilitate proper drainage and maintain stability. An open cross-connection allows for the equalization of pressure and fluid transfer between tanks, which is essential for ensuring the stability of the vessel. It helps in managing the weight distribution and center of gravity, particularly when a vessel is loaded with dry cargo, which can shift during transit.

In cases where the cargo is shifted or if there are sudden movements of the vessel, having the cross-connection open ensures that any water that needs to be drained can do so effectively, preventing potential stability issues that could arise from uneven load distribution. Properly managing tank configurations and settings is crucial in maintaining the vessel's balance and stability in varying operational conditions.

In contrast, closing the valve would restrict this essential fluid movement, which could lead to potential stability problems, especially during cargo operations or in heavy seas. Similarly, a partially open setting may not provide the optimal balance needed for stability. The 'not applicable' choice suggests no need to adjust the setting, which overlooks the importance of actively managing stability in response to the vessel's loaded condition.