USCG USCG Safety Eng
Set 7 • Question #188 of 254
Launch Interactive Practice Room Water ballast placed in a tank that has been crude oil washed, but not water rinsed, shall be regarded as __________.
A
clean ballast
B
dirty ballast
✓ Correct Answer
C
segregated ballast
D
crude oil
USCG NMC Regulatory Explanation
Under MARPOL Annex I, Crude Oil Washing (COW) removes heavy waxy residues with solvent action, but leaves residual oil films on tank surfaces. Therefore, ballast water loaded into a COW-cleaned tank that has not been subsequently water-rinsed is classified as 'dirty ballast' and must be transferred to slop tanks or shore reception facilities.
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