Connecting Sailors Around the World
As with other ships, tankers are high in the water (they have a large freeboard) when empty. Due to this the bow tends to bounce along the waves instead of slicing through them. This causes heavy stresses and also decreases the stability of the ship. Ballast is taken to increase
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Prior to discharging dirty ballast, it's necessary to relinquish time for the ballast to settle to induce a decent oil/water separation. It is a legendary reality - oil is lighter than water and would perpetually float on prime of water - provided enough time is given for it to settle. The time for subsidence might vary betting on the movement of the ship and also the variety of oil being handled - this sometimes depends
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