Question 4347 Deck General

The correct answer is A) 10 seconds. The minimum period of motion that does not exceed the design limits of the legs is 10 seconds. This is because the stability and motion characteristics of an offshore drilling unit, such as the COASTAL DRILLER, are designed to withstand a single amplitude roll of up to 10 degrees without exceeding the design limits of the legs. Therefore, with the given single amplitude roll of 8 degrees, the minimum period of motion should be 10 seconds to remain within the design limits. The other options, B) 8 seconds, C) 6 seconds, and D) 4 seconds, are incorrect because they do not match the design specifications for the COASTAL DRILLER, which require a minimum period of 10 seconds for an 8-degree single amplitude roll.