Question 5 TK02 - Tank Vessel Assistant - Liquefied Gas

The Correct Answer is C. **Explanation for C being correct:** U.S. regulations concerning tank vessels (specifically addressed in the Code of Federal Regulations, Title 33, Subchapter O, related to cargo handling on tank vessels) mandate that vessels carrying flammable or combustible liquids in bulk (with capacities generally exceeding 250 barrels) must have a reliable means of emergency shutdown (ESD) for the cargo transfer system. The primary purpose of this Emergency Shutdown (ESD) system is to immediately stop the transfer of oil or hazardous liquid during an emergency (such as a fire, hose rupture, or decoupling) to prevent a massive spill or leak that could exacerbate the situation. Therefore, the device is designed to **stop the flow of oil to a shore facility or other vessel** (the receiving entity) by shutting down the cargo pump(s) and potentially closing critical valves. **Why the other options are incorrect:** * **A) shuts off the main propulsion plant:** While emergency situations might necessitate shutting down the main engines, the primary, mandated function of the *cargo transfer emergency shutdown* system is dedicated to cargo safety, not vessel movement safety. Vessel propulsion shutdown is handled by separate emergency controls. * **B) shuts off the firefighting foam systems:** This is the opposite of what would be desired in an emergency. Firefighting systems (like foam) must remain operational, or even be automatically activated, during an incident. The ESD system does not control firefighting apparatus. * **D) secures electrical power to all motors:** A complete blackout is detrimental to emergency response, as it would disable essential navigation, communication, lighting, and emergency systems (including emergency generators and potentially emergency fire pumps). The ESD system targets only the motors/pumps specifically involved in the cargo transfer process, not the entire ship's electrical grid.