To prevent oil from escaping into the sea when ballasting through the cargo piping system, what should you do first?

Starting the cargo pumps first is the correct action to prevent oil from escaping into the sea when ballasting through the cargo piping system because it ensures that any potential oil being displaced from the tanks is properly managed and contained. By activating the cargo pumps, you can control the flow of any residual oil and minimize the chance of spillage as you transition to ballasting. This step is crucial as it initiates the movement of fluids and prepares the system to handle any liquid effectively, thus reducing the risk of oil entering the waterway.

While other actions like opening sea suction valves or sealing all openings are important steps in the overall process, they should be carried out after ensuring that the pumps are engaged to manage fluid levels actively. Conducting a visual inspection is also a prudent measure, but it is typically done concurrently with preparations and checks before starting operations, not necessarily the first action in the ballasting process. Ensuring the pumps are operational helps in managing the entire operation safely from the outset.