The DEEP DRILLER, loaded as shown in Sample Load Form #4 (Drilling), suffers major damage which results in flooding in tank C3S. Pumping from tanks in the vicinity of the damage have proven ineffective. Your best countermeasure is to __________.
• Transverse stability and list correction when a wing tank on one side is flooded • The effect of counterflooding in a tank on the same side vs. the opposite side • How the location of the tank (fore/aft and port/starboard) on Sample Load Form #4 affects the vessel’s trim and list
• First, visualize where tank C3S is on the plan and which way the vessel will tend to list or trim when it floods. Which side is damaged and is it more forward, midships, or aft? • Then, compare each option: will that action add weight to the damaged side, remove weight from it, or add weight to the opposite side? How does that affect list and overall stability? • Ask yourself which action will most effectively reduce the angle of heel and improve stability without unduly increasing free surface or hogging/sagging stresses.
• Confirm on Sample Load Form #4 whether tanks C3S, C1P, 1P, and 10S are port or starboard and whether they are centerline or wing tanks • Check which tanks are already flooded or damaged and which have intact boundaries—you generally avoid moving water into damaged spaces • Verify which choice provides counterflooding on the correct side and at a similar longitudinal location to best oppose the heeling moment from the flooded tank
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