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Weight of the Cargo plays the most crucial role on Stability of the Ship, as it decides the position and magnitude of G and thus the value of GM,the Metacentric Height.
(1) Light Cargo:
If the Cargo is light, the position of the center of Gravity, G would be higher and thus the value of Metacentre GM would be lower. In this condition the ship will roll to the larger angles and is called to be a "Tender Ship". To counter such condition, ballast water is required to be taken in the Ballast tanks in the double bottom to lower the position of G.
(2) Liquid Cargoes in Bulk:
For the liquid cargo, the precaution to be taken, stability-wise is to make sure that the cargo tank is either full or empty. There should not be any slack tanks, otherwise the factors of "Free Surface effect" and "Sloshing" will come into picture, which effectively reduces the Metacentric height, GM and thus reduces the Stability of the Ship.
(3) Deck Cargoes :
Deck cargoes lifts the position of Centre of Gravity, G and thus reduces the value of Metacentric height, GM.
It is prudent to load less heavy cargoes on deck and may be to take ballast water in the double bottom Ballast tanks to increase the GM and thus stability.
(4) Normal Consumption of Fuel & Water:
Depending on the position of the Fuel and Fresh water tanks, the daily consumption will have slow effect on the Stability of the Ship.
Normally the fuel storage tanks are in Double bottom and thus its daily consumption will reduce the value of the GM, and thus stability. It also changes the trim of the vessel in due course.
And mostly the Fresh water tank is in Aft of the ship and is normally a High tank, in which case the daily consumption will increase the GM slightly.
Since, normally the capacity of fresh water tanks are not substantial (could be about 250-400 M tons)and the Fresh water generator produces the Fresh water and fill up the tanks when ship is running. The total effect of daily consumption of fresh water has little impact on the Stability of the Ship.
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