- This regulation comes under MARPOL Annex II, Chapter 2 -Categorization of Noxious Liquid Substances, Regulation 6.
- For the purpose of the regulation of this Annex, Noxious Liquid Substances shall be divided into four categories as follows:
- Category X
- Category Y
- Category Z
- Other Substances
Category X:
- Noxious Liquid Substances that, if discharged into the sea from tank cleaning or deballasting operations, are deemed to present a major hazard to either marine resource or human health and justify the prohibition of discharge into the marine environment.
Category Y:
- Noxious Liquid Substances that, if discharged into the sea from tank cleaning or deballasting operations, are deemed to present a hazard to either marine resource or human health or cause harm to amenities or other legitimate uses of the sea and therefore justify a limitation on the quality and quantity of the discharge into the marine environment.
Category Z:
- Noxious Liquid Substances that, if discharged into the sea from tank cleaning or deballasting operations, are deemed to present a minor hazard to either marine resource or human health and justify less stringent restrictions on the quality and quantity of the discharge into the marine environment.
Other Substances:
- Other Substances are indicated as OS in the pollution category of IBC code which has been evaluated and found to fall outside Category X, Y or Z of this Annex because they are, at present, considered to present no harm to marine resources, human health, amenities or other legitimate uses of the sea when discharged into the sea from tank cleaning or deballasting operations.
- The discharge of bilge or ballast water or other residues or mixtures containing only substances referred to as "Other Substances" shall not be subject to any requirements of this Annex.
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Reference: IMO Publications & Documents - International Conventions - MARPOL - Annex II
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