🔍 Key Concepts

• Understand the deballasting line-up for the DEEP DRILLER, especially which port-side valves are associated with tanks 1P and 10P • Know how ballast tanks are numbered and how that numbering relates to valve numbers and locations • Review typical ballast system diagrams to see how suction and discharge lines are arranged for forward and aft port tanks

💭 Think About

• Which valve numbers are normally associated with the suction/discharge for tank 1P and for tank 10P on the DEEP DRILLER ballast diagram? • Does deballasting from these two tanks require opening a common line valve, a tank-isolation valve, or both? Which of the options could serve that purpose? • Looking at the layout, which of the listed valves is located on the same main line segment that connects to both tank 1P and tank 10P?

✅ Before You Answer

• Verify on the ballast system P&ID or line diagram which specific valve number is labeled for tank 1P and for tank 10P • Check whether any of the listed valves (44P, 24P, 2P, 48P) are clearly marked as serving a different tank or manifold not used in this operation • Confirm that the selected valve, when opened, would allow flow from both 1P and 10P toward the deballasting pump without unintentionally involving other tanks