A crude oil wash (COW) system is considered as __________.
• Crude Oil Washing (COW) purpose on tankers • How Butterworth systems are used for tank cleaning • Difference between tank cleaning vs oil purification or bilge cleaning
• Ask yourself: On a tanker, what is the main reason we use crude oil wash instead of water in cargo tanks? • Which choices describe a process used INSIDE cargo tanks during discharge, and which describe unrelated systems? • Does COW have anything to do with treating oil quality, or is it about cleaning tank surfaces and improving cargo outturn?
• Identify which options involve cargo tank cleaning rather than oil treatment or bilge cleanup • Check your memory: COW is usually done during discharge of crude oil cargo using the ship’s existing cargo handling system and fixed tank-cleaning machines • Eliminate any option that talks about purifying oil or bilge cleaning, as that is not the function of COW
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