Question 2090 Deck Safety

The correct answer is B) Loss of stability from free surface effect. The presence of a half-full tank onboard a vessel can result in a significant loss of stability due to the free surface effect. When a tank is only partially filled, the liquid inside can shift and slosh around as the vessel moves, creating a free surface that can reduce the vessel's righting moment and lead to a dangerous loss of stability. This is the principal danger posed by a half-full tank, as it can compromise the vessel's overall stability and increase the risk of capsizing. The other options, while potentially concerning, are not the primary danger in this situation.