Question 2269 Deck Safety

The correct answer is B) 81.6 tons. To calculate the increase in draft, we can use the formula: Increase in draft = Change in displacement / (Waterplane area x Density of water). Given the vessel's length (680 ft), beam (60 ft), and waterplane coefficient (0.84), we can calculate the waterplane area as 0.84 x 680 x 60 = 34,560 sq ft. The density of saltwater is approximately 64 lb/cu ft. An increase in draft of 1 inch (1/12 ft) would result in an increase in displacement of 34,560 x 1/12 = 2,880 cu ft. Converting this to long tons (1 long ton = 2,240 lb), we get 2,880 x 64 / 2,240 = 81.6 long tons. Therefore, the correct answer is B) 81.6 tons.