Question 4743Deck General70% to pass
Laying down drill pipe from the derrick of a semisubmersible on location reduces the _______________.
AI Explanation
The correct answer is D) natural roll period.
Laying down drill pipe from the derrick of a semisubmersible reduces the weight on the top of the structure, which in turn decreases the vessel's natural roll period. The natural roll period is the time it takes for the vessel to complete one full roll cycle. Reducing the weight aloft decreases the vessel's moment of inertia, resulting in a shorter natural roll period.
The other options are incorrect because:
A) Waterplane area is not affected by the change in weight distribution.
B) Metacentric height, which determines the vessel's stability, is also not directly affected by the weight change.
C) Righting moment, the force that returns the vessel to an upright position, is not reduced by laying down the drill pipe.
Related Questions
#4741 The downflooding angle for a MODU is the maximum angle at which _______________.#4742 On a semisubmersible drilling unit, increasing riser tension increases_______________. #4744 A semisubmersible which will not remain upright and will assume a list either to port or starboard is likely to have _______________.#4745 Semisubmersibles A and B are identical. However, "A" is more tender than "B". This means that "A" relative to "B" has a _______________.#4746 On a semisubmersible drilling unit, decreasing riser tension increases _______________.