🔍 Key Concepts

• Bilge system redundancy on drilling vessels (which pumps are allowed to serve as emergency or supplementary bilge pumps) • The difference between ballast pumps, drill water pumps, and salt‑water service/fire pumps in normal operations • How the DEEP DRILLER’s piping diagram usually cross‑connects certain pumps to the bilge system

💭 Think About

• Which type of pump is most commonly designed and piped so it can safely handle dirty bilge water, not just clean ballast or fresh drill water? • On a typical MODU like the DEEP DRILLER, which pump would you expect to be cross‑connected and approved for bilge service in an emergency or as a backup? • Think about the primary purpose of each pump listed. Which one’s primary duty is most closely related to general seawater service throughout the rig?

✅ Before You Answer

• Verify which pump is shown on the bilge/ballast piping diagram as being cross‑connected to the bilge main. • Check which pump is normally used for seawater service to multiple systems, not just tank transfer. • Confirm in the vessel’s fire and bilge system description which pump is specifically authorized to back up the bilge pump.