Question 3503Deck General70% to pass
The DEEP DRILLER is under tow at a 20 foot draft. The rig motions are close to exceeding the limits for critical pitch and roll. The rig is also experiencing occasional pounding on the horizontal braces. In this situation you should _______________.
AI Explanation
The correct answer is C) ballast down to a 45 foot draft and check vessel motions.
The reasoning is that when a vessel is experiencing excessive pitch and roll motions, as well as pounding on the horizontal braces, the proper action is to ballast the vessel down to increase its draft and improve stability. Ballasting down to a 45 foot draft will lower the vessel's center of gravity, which will help dampen the excessive motions and reduce the pounding. This is in line with standard vessel handling procedures to address these types of motion issues.
The other options are incorrect because waiting until the limits are exceeded (A) is too late and could lead to damage, and ballasting up (B) would actually make the stability and motions worse. Shortening the tow wire (D) may provide a smoother tow, but does not address the underlying stability and motion problems.
Related Questions
#3501 In observing rig motion while under tow, the period of roll is the time difference between _______________.#3502 The full period of motion of the DEEP DRILLER while tripping is 8 seconds and the maximum pitch angle as seen on the inclinometers is 4 degrees. From the standpoint of critical motion, the motion is _______________.#3504 The DEEP DRILLER is being towed at a 20 foot draft. Vessel motions are within acceptable limits, but the waves begin to hit the horizontal braces. You should _______________.#3505 While being towed at a 19.5 foot draft, the DEEP DRILLER experiences single amplitude pitching of 7.5 degrees with an 8 second period. You should _______________.#3506 When floating, the appropriate leg horizontal must be aligned in the center of the _______________.