A semisubmersible rig under tow should be ballasted down if ______.A.motion begins to be excessiveB.water begins to break over the pontoonsC.period of roll exceeds 12 secondsD.forward progress is halted by head wind
A semisubmersible rig under tow should be ballasted down if ______.
A.motion begins to be excessive
B.water begins to break over the pontoons
C.period of roll exceeds 12 seconds
D.forward progress is halted by head wind
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