If the tanks are empty, what position should the cross-connection valve have?

When tanks are empty, the cross-connection valve should be kept open. This is important for several reasons. An open cross-connection valve allows for any residual fluid that might remain in the system to flow freely and can aid in the proper drainage of the tanks. It also ensures that any liquid having the potential to leak or spill is not trapped within the system, which could lead to issues like pressure buildup or contamination.

In a stability context, keeping the valve open helps maintain the overall balance and reduces the risk of free surface effects that might occur with fluid remaining in partially filled tanks. This can be pivotal in determining the vessel's stability and handling characteristics.

It's important to note that a closed valve would restrict flow and could contribute to complications, while a partially closed valve might not effectively manage drainage, leading to similar risks. The idea that the valve could be in any position neglects the importance of systematic control over fluid management in the tanks, which is crucial for safe vessel operation.