Chemical Tanker Familiarization

Definitions & Abbreviations➢
Category X: Noxious liquid substances which, if discharged into the sea from tank cleaning or deballastingoperations, are deemed to present a major hazard to either marine resources or human health and, therefore, justify the prohibition of the discharge into the marine environment;
➢Category Y: Noxious liquid substances which, if discharged into the sea from tank cleaning or deballastingoperations, are deemed to present a hazard to either marine resources 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 which, if discharged into the sea from tank cleaning or deballastingoperations, are deemed to present a minor hazard to either marine resources or human health and therefore justify less stringent restrictions on the quality and quantity of the discharge into the marine environment;
➢Other substances: Substances indicated as OS in the pollution category column of chapter 18 of the International Bulk Chemical Code which have been evaluated and found to fall outside category X, Y or Z as defined inregulation 6.1of 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 deballastingoperations. 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 the Annex.

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