Salt water ballast is to be discharged into the #6 port and starboard wing tanks. Which combination of valves, illustrated, must be opened, and which valves should be closed? GS-0139

Correct Answer: Option C — 1, 3, 5, 6, 8 and 10 open; 2, 4, 7 and 9 closed.

Proper ballast operations require aligning the suction from the sea chest and the discharge to the specific wing tanks. Following the piping diagram, valves 1, 3, 5, 6, 8, and 10 must be open to create a continuous flow path, while isolating valves 2, 4, 7, and 9.