When loading cargo, which valve should be opened last?

When loading cargo onto a tanker, it is important to follow specific procedures to ensure safety and efficiency. The manifold valve should be opened last because it serves as a critical point of control for the entire loading operation. The manifold valve is the primary connection between the ship's cargo system and the shore loading system.

Opening the manifold valve last ensures that the loading process is managed in a controlled manner. Before this valve is opened, other valves, such as the loading and overflow valves, are typically opened first to set up the flow of the cargo. The relief valve also plays a crucial role during loading, as it helps to prevent overpressure in the cargo system.

By keeping the manifold valve closed until the cargo is ready to flow, the crew can closely monitor the loading process and respond to any issues that arise, such as unexpected pressure changes or spills. This systematic approach minimizes the risks associated with cargo loading operations, emphasizing the importance of having proper control over the flow of materials into the tanker.