Ballast 15
Ballast 15 : Seawater taken into a vessel's tanks in order to submerge the vessel to proper trim. Ballast can be taken into cargo tanks, double bottoms, fore and aft peak tanks and/or segregated ballast tanks, (SBT). Clean: Term applied to the seawater used for ballast when it is not contaminated by any oil and is carried in clean tanks. Dirty: Term applied to the sea water used for ballast when it is contaminated with the remnants or residue left in cargo tanks that previously carried crude oil or heavy persistent refined oils. Permanent: Ballast carried in ship's tanks that were designed to carry nothing else. Segregated/ Dedicated: Ballast kept in tanks segregated from cargo pipes and tanks. Ballast Movement: A voyage or voyage leg made without any paying cargo in a vessel's tanks. To maintain proper stability, trim, or draft, seawater is usually carried during such movements
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