On the COASTAL DRILLER, in case the bilge discharge is oily, the bilge water should be discharged through the __________.

Correct Answer: Option B — skimmer tank

Oily bilge water must be processed through the skimmer tank to separate hydrocarbons from water before any discharge occurs. This operational procedure is essential for maintaining compliance with environmental regulations, ensuring that only water meeting the 15 ppm oil content limit is discharged overboard via the oily water separator.