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Influence of ship's sag on tanker loading
In the practice of tanker transportation, the drooping of tankers, especially the drooping of large oil tankers, is universal, but the difference between the different management companies and ships is very different, which often affects the suitability of tankers in operation. Goods.
Ship sag
SAGGING is because the hull is subjected to bending moments with equal and opposite directions in the front and rear of the hull. In the case of cargo loading, because the buoyancy at the bow is less than gravity, the buoyancy of the bow and stern is greater than gravity, and under the action of the bending moment, the bow sag is deformed. The bow is subjected to the largest bending moment and therefore the position with the largest amount of sag. The so-called ship bending moment refers to the bending moment at the bow.
In order to facilitate the expression of this article, the following definitions are specifically made for this article. Relative to the sag value, the difference between the actual draft of the bow and the average actual draught of the bow and the bow. This value is the value we often refer to in our daily operations. That is, δd=d¤-(dF+dA)/2 (where d¤ is the average draught of the bow, dF is the average draught, and dA is the average draught). Absolute sag, the difference between the actual draft of the bow and the draught of the bow under the same loading conditions when the ship is rigid. This value is the draught increase value to be reserved in the stowage. That is, δd¤=d¤-dM (where dM is the average draft, that is, the ship is a draught under the rigid body condition).