Question 9 TK02 - Tank Vessel Assistant - Liquefied Gas

The Correct Answer is C **Why Option C ("emergency pump control on the cargo deck") is correct:** U.S. regulations (specifically those governed by the Coast Guard, such as in 33 CFR 156 regarding transfer operations) mandate that facilities and vessels must have a clearly marked and accessible emergency shutdown system (ESD). This system must be capable of stopping the flow of cargo (oil or LNG) immediately. Stopping the primary source of flow, which is typically the cargo pump, is the standard and most direct method for achieving an emergency stop on a vessel or facility. An "emergency pump control on the cargo deck" serves as an accessible local control point for the mandated emergency shutdown system, ensuring personnel can stop the transfer quickly during an incident. **Why the other options are incorrect:** * **A) self-closing automatic disconnect fitting:** While automatic quick-disconnect fittings exist (especially for LNG), they are primarily an over-stress or failure mitigation device (designed to activate if a vessel drifts or lines snap). They are not the mandatory **emergency means** or ESD system required by regulations for personnel to manually activate to stop the flow in response to a leak, fire, or other emergency condition during the transfer. * **B) automatic pressure-sensitive oil flow regulator:** A pressure-sensitive flow regulator is a normal operational control device designed to maintain or adjust flow rates during standard operations. It is not an emergency shutdown system designed to immediately cease all flow upon detection of an incident or manual activation by crew/facility personnel. * **D) manually-operated quick-closing valve:** Although a quick-closing valve (QCV) can stop the flow, regulations typically require the emergency means to stop the source (the pump) rather than relying solely on a valve that might be downstream of a break or failure point. Furthermore, while QCVs are often used, they are frequently integrated into the overall ESD system. However, the requirement is often satisfied by the primary control mechanism (the pump stop). In the context of required vessel equipment, stopping the cargo pump via a dedicated emergency control (C) is the most comprehensive and universally required method for emergency shutdown.