Question 4728Deck General70% to pass
A semisubmersible at a draft of 19 feet 9 inches arrives on location planning to deploy eight mooring lines. Each anchor weighs 15 long tons and each mooring line consists of 3,000 feet of 3-inch chain (89.6 lbs/ft). If no ballast corrections are made, what is the expected draft if the average TPI is 60?
AI Explanation
The correct answer is B) 18 feet 3 inches.
To arrive at this answer, we need to calculate the change in draft due to the weight of the anchors and mooring lines. The total weight of the anchors is 8 x 15 long tons = 120 long tons. The total weight of the mooring lines is 8 x 3,000 feet x 89.6 lbs/ft = 2,148,800 lbs, which is approximately 958 long tons. The total additional weight is 120 + 958 = 1,078 long tons. Using the average TPI of 60, the expected change in draft is 1,078 / 60 = 17.97 feet, or approximately 18 feet 3 inches.
The other options are incorrect because they do not accurately reflect the change in draft based on the given information. Option A) 17 feet 9 inches is too low, while options C) 18 feet 9 inches and D) 21 feet 3 inches are too high.
Related Questions
#4726 A semisubmersible with a positive GM, and TCG located starboard of the centerline, inclines to an angle of _______________.#4727 While loaded as shown in the Sample Load Form #4 (Drilling), all of the liquid mud is dumped. What would be the new draft? #4729 A semisubmersible, 200 feet in length between draft marks with the LCF 10 feet aft of amidships, records the following drafts: Port Forward 64'-09"; Port Aft 68'-09"; Starboard Forward 59'-09"; and Starboard Aft 63'-09". What is the list? #4730 A semisubmersible, 200 feet in length between draft marks with the LCF 10 feet aft of amidships, records the following drafts: Port Forward 64'-9"; Port Aft 68'-9"; Starboard Forward 59'-9"; and Starboard Aft 63'-9". What is the true mean draft? #4731 With no environmental forces on the DEEP DRILLER, the average of the forward drafts is 61.0 feet, and the average of the aft drafts is 59.0 feet. KGL is 51.13 feet. What is the value of LCG?