The free surface effect, FSE is a Stability Status which can cause a watercraft to become unstable and eventually capsize. What is FSE Free Surface Effect on a ship, and how to reduce or prevent for it?
When a vessel with full tanks heels over, the contents of the tank do not shift. The tank's canter of gravity does not change, so it does not affect the vessel's stability.
In a partly filled tank or fish hold, the contents will shift with the movement of the boat. This "free surface" effect increases the danger of capsizing.
When a vessel with partially filled spaces heels over, the contents of the spaces will shift. The canter of gravity moves over to the side, making the vessel less stable. To avoid this free surface effect, try to have as less as possible partially filled tanks and compartments as possible.
It refers to the tendency of liquids, and of unbound aggregates of small solid objects, like seeds, gravel, or crushed ore, whose behavior approximates that of liquids, to move in response to changes in the attitude of a craft's cargo holds, decks, or liquid tanks in reaction to operator-induced motions (or sea states caused by waves and wind acting upon the craft). When referring to the free surface effect, the condition of a tank that is not full is described as a "slack tank", while a full tank is "pressed up".
[Wikipedia]
Негізгі бет What is FSE Free Surface Effect on a ship, and how to reduce or prevent for it?
No video
Пікірлер