🔍 Key Concepts

• Bilge system layout on offshore drilling units like the COASTAL DRILLER • Difference between valves that control flow and discharge points where the bilge actually leaves the system • Typical meaning of terms like dump valve, sump, and skimmer tank in machinery‑space systems

💭 Think About

• Which component in the options sounds like the actual location or point where fluid is discharged, rather than just a valve that opens/closes flow? • On a drilling unit, what is the usual path of oily bilge water—does it go straight over the side, or is it normally routed through some kind of collection or treatment arrangement first? • Think about which item would be a destination for bilge water versus a control device in the piping system.

✅ Before You Answer

• Identify which choices are valves (devices) versus a discharge or tank (place where the liquid goes). • Consider normal environmental requirements: would a modern unit ‘normally’ send bilge water straight overboard without processing or collection? • Ask yourself which option is most likely described in the piping diagram as the usual bilge discharge path, not just an emergency or bypass route.