When filling fuel-oil tank 6P on the DEEP DRILLER, it is necessary to open valve __________.
Official USCG Answer & Rule Citation
Correct Answer: Option D — 12
Valve 12 is designated in the DEEP DRILLER piping diagram as the specific manifold control for filling fuel-oil tank 6P. Proper valve alignment is essential to prevent cross-contamination or over-pressurization of fuel tanks, adhering to standard operating procedures for fuel transfer operations on mobile offshore drilling units.
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