Question 3431Deck General70% to pass
While being towed at a 19.5 foot draft, the DEEP DRILLER experiences single amplitude rolls of 10° with a period of 8 seconds. You should _______________.
AI Explanation
The correct answer is A) ballast the rig to a 45 foot draft and check the vessel motions.
The reasoning is that the deep draft of 19.5 feet combined with the significant single amplitude rolls of 10 degrees and a short period of 8 seconds indicates the vessel is in a potentially unstable condition. Ballasting the rig to a deeper 45 foot draft can help improve the vessel's stability and reduce the excessive rolling motions, allowing the towing operation to proceed safely. The other options, such as continuing at the current draft or further increasing the draft, would not adequately address the vessel's stability issues. Altering course alone may not be sufficient to mitigate the rolling motion.
Related Questions
#3429 A mobile offshore drilling unit is on the waters of the U.S. Outer Continental Shelf. It has a length of 220 feet and a breadth of 190 feet. Where must the obstruction lights be located? #3430 What should be done after repairing a surface crack on a link of anchor chain by grinding? #3432 Where will you find the requirements for the lights that must be displayed on a mobile offshore drilling unit that is being towed? #3433 For the purposes of the International Rules of the Road, a non-self-propelled mobile offshore drilling unit under tow is considered to be a _______________.#3434 The DEEP DRILLER is loaded as shown in the Sample Load Form #1 (Transit). Excessive motion makes it necessary to ballast down to survival draft. It is decided to check the stability at the intermediate draft of 32 feet. If the added ballast has an average VCG of 9.03 feet, and the sum of free surface moments is 56,244 foot-tons, what is the new margin on the maximum allowable KG?