The DEEP DRILLER is loaded as shown in Sample Load Form #4 (Drilling). While the unit is deballasting, starboard valve 19 fails in the closed position. You may deballast from tank 9S by pumping from tank 8S by opening valves 20 and __________.
Official USCG Answer & Rule Citation
Correct Answer: Option C — 18
Piping system routing on the DEEP DRILLER requires bypassing a failed valve by utilizing interconnected cross-over manifolds; opening valves 20 and 18 establishes a clear suction path from tank 9S through tank 8S.
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