While the DEEP DRILLER is loaded as shown in Sample Form #4 (Drilling), casing is accidentally dropped over the port side. Because the tank sounding level and port forward inclination are rapidly increasing, you decide that tank 1P is damaged. Your best countermeasure is to __________.
• Damage stability and what happens when a wing tank floods on the low (port) side • How counterflooding is used to control list vs. how it affects overall stability and draft • The relative effect of shifting weight vertically (dumping mud) vs. shifting weight transversely (counterflooding)
• When a port wing tank floods and the vessel is already listed to port, what happens if you add more water to a starboard tank? How does that change list and stability? • How does dumping a heavy, high-mounted liquid (like drilling mud) affect the vessel’s center of gravity and list? Would it help or hurt in this case? • If a specific tank is damaged and flooding, what is usually your first priority: reduce heeling moment, reduce free surface, or reduce overall displacement?
• Identify where tank 1P is located relative to centerline and waterline (wing vs. centerline, high vs. low) on Sample Form #4 • Compare the positions of C3S and 9S: are they high/low, near/away from centerline, and how would flooding them affect list and trim? • Consider whether removing heavy mud or adding more water will more effectively correct a rapidly increasing list to port, while preserving adequate stability and freeboard.
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