In order for the vessel to discharge its cargo to a shore facility from #6 centerline tank, with the #7 main deck manifold valve open, which of the listed valve combinations, shown in the illustration, must be opened and which of the valves must be closed? See illustration GS-0139.
• Follow the piping path from #6 centerline tank to the main deck manifold and identify which valves are actually in that line • Determine which valves connect to other tanks or the sea chest that should be isolated for this operation • Remember that the question says the #7 main deck manifold valve is already open, so think about what needs to happen between that point and the tank
• Trace the flow starting at #6 centerline tank and move toward the pump and then toward the deck manifold: which numbered valves must be open for cargo to reach shore? • Which valves, if left open, would allow cargo to flow to the sea chest or other #6 tanks instead of only to the #6 centerline tank? • Compare each answer choice against the line you traced: where would the cargo go with that pattern of open/closed valves?
• Make sure all valves in the direct flow path from #6 centerline tank to the open #7 manifold are listed as open in the choice you select • Verify that valves leading to the sea chest (ballast/sea line) are closed so cargo does not discharge overboard • Verify that valves to #6 port and #6 starboard tanks are closed if the question wants discharge from only #6 centerline
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