What is the correct procedure for closing valves after loading a tanker?

The procedure for closing valves after loading a tanker requires careful handling to ensure safety and prevent inaccuracies in system readings. The correct answer describes a methodical approach: closing the valves by initially shutting them completely, then reopening them slightly (by one or two turns) before closing them again fully.

This process serves multiple purposes. First, it helps to relieve any potential pressure that might be trapped in the system, thereby reducing the risk of leaks or stress on the valves themselves. An initial closure ensures that the valve has completely shut off the flow, and the slight reopening allows for any residual pressure or fluid to escape safely, stabilizing the system before the final closure. This technique also allows the operator to ascertain that the valves are functioning correctly without sticking or seizing, which could lead to operational issues later.

In contrast, loading only one tank at a time limits operational efficiency and can increase the time spent loading the vessel. Keeping a strain on the loading hoses may provide support but does not pertain to the specific valve closure procedure and may not address the potential risks during the closure process. Lastly, keeping the seamen on watch in the messroom is not a practical or safe procedure as effective monitoring and communication are essential during such operational phases.

Overall, the method