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Tanker operation : Restriction of carriage and discharging of oil and water ballast

Due to the nature of trade oil tankers often have to run a considerable distance with empty cargo tanks. Ballast water is essential to ensure safety during such empty voyages. Ballast water is used to compensate for the overall weight distribution of a ship and to keep her float safely, remain upright in a stable condition. It helps to maintain stability under different cargo loads during loading and unloading operations. For better maneuverability, any vessel may need to adjust her ballast.

Onboard an oil tanker during cargo operations requires some careful consideration for ballast water taking in or out. The provision of MARPOL 73/78, ANNEX I implies restriction of Loading Water Ballast into any cargo tanks. Dedicated ballast tanks, therefore, strictly maintained for ballasting operation. However, the annex I explained ballast might only be carried in cargo oil tanks or fuel oil tanks if necessary in order to prevent severe structural damage (e.g., Heavy weather), or to prevent human casualties or loss of human life.

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Oil tanker underway