How do you calculate stability of a ship?
The statical stability of ships is checked by comparing the righting-arm curve with the curves of heeling arms. A heeling arm is calculated by dividing a heeling moment by the ship displacement force.
Why is that heavy lifting operations and vessel stability is very important explain?
Heavy lift cargoes, when loaded, can have a great effect on the seaworthiness of the vessel. Also, the heavy lift may cause damage to the vessel’s structure and result into loss of the vessel’s watertight integrity, resulting in flooding/ progress flooding of the vessel.
How do you increase GM on a ship?
This will be done by shifting the center of gravity downwards by placing heavy weights in lower part of the vessel (such as by ballasting the DB tanks). First is to use the shore crane for loading this heavy lift. Second is to use the ship’s crane with as flat boom as possible.
What is KG stability?
The vertical distance (along the ship’s centerline) between the keel and the centre of gravity is expressed as ‘KG’, as shown in Figure 2.
What is heavy lift cargo on ship?
A heavy-lift ship is a vessel designed to move very large loads that cannot be handled by normal ships. Semi-submersible ships that take on water ballast to allow the load—usually another vessel—to be floated over the deck, whereupon the ballast is jettisoned and the ship’s deck and cargo raised above the waterline.
What is an indivisible cargo?
Generally, indivisible loads are loads that can’t be broken apart easily in order to comply with weight regulations. Common loads that can’t be broken apart easily are construction equipment and specialized loads like tanks.
What is trim in ship stability?
Trim is the difference between the draughts forward and aft. When the forward and aft draughts are the same the ship is said to be on an even keel. A small trim by the stern is desirable as most ships are expected to handle better in a seaway in this condition.
What is GM ship stability?
The distance between G and M is known as the metacentric height (GM). A stable vessel when upright is said to have a positive metacentric height (GM), i.e. when the metacentre (M) is found to be above the centre of gravity (G). This is usually referred to as having a positive GM or a positive initial stability.
What is GZ in ship stability?
The vessel’s centre of gravity (G) has a distinct effect on the righting lever (GZ) and consequently the ability of a vessel to return to the upright position. The lower the centre of gravity (G), the bigger is the righting lever (GZ).
What is KB in ship stability?
Center of Buoyancy (CB): The vertical distance (along the ship’s centerline) between the keel and the centre of buoyancy is expressed as ‘KB’, as shown in Figure 3.
https://www.youtube.com/watch?v=SGDluYDb3UQ