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Prevention of Pollution by ships -Marpol Annex II (Noxious Liquid Substances in Bulk)

Annex II (Noxious Liquid Substances in Bulk) : This Annex entered into force on 6th April 1987. It contains regulations for the control of pollution by noxious liquid substances carried in bulk. This is the first attempt to control, on an international basis, the discharge of tank washings and other residues of liquid substances (other than oil) which are carried in bulk. These substances are mainly petro-chemicals, but include other chemicals, vegetable oils, coal-derived oils, and other substances categorised as noxious liquid substances in accordance with defined guidelines.



This Annex also contains requirements for standards of construction of chemical tankers and other ships carrying these substances, in order to minimise accidental discharge into the sea of such substances.

The United Kingdom domestic legislation to implement this Annex was the Merchant Shipping (Control of Pollution by Noxious Liquid Substances in Bulk) Regulations 1987.

The regulations apply to all ships carrying noxious liquid substances in bulk and contain, inter alia, provisions to reduce operational and accidental pollution from ships and require ships to be fitted with equipment to reduce the amount of residues of noxious liquid substances in the ship’s cargo tanks to the minimum when unloading. The regulations impose restrictions on the quantities of residues that can be discharged into the sea, the rate of discharge and where they can be discharged.

Discharges into the sea of the most noxious of these liquid substances are prohibited and ships have to make use of reception facilities ashore in order to dispose of residues. Ships are required to carry and comply with a Manual of approved procedures and arrangements, and to record all operations involving these substances in a cargo record book.

All ships which carry noxious liquid substances are required to carry a Procedures and Arrangements Manual and are to be provided with the equipment specified in the manual. The ship specific operating instructions give details of the requirements

Categorisation of Noxious Liquid Substances :
These substances are listed in the regulations and divided according to their potential environmental hazard into four categories as follows.

Category A:Noxious liquid substances which if discharged into the sea from tank cleaning or deballasting operations would present a major hazard to either marine resources or human health or cause serious harm to amenities or other legitimate uses of the sea and therefore justify the application of stringent anti-pollution measures.

Category B: Noxious liquid substances which if discharged into the sea from tank cleaning or deballasting operations would 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 the application of special anti-pollution measures.

Category C: Noxious liquid substances which if discharged into the sea from tank cleaning or deballasting operations would present a minor hazard to either marine resources or human health or cause minor harm to amenities or other legitimate uses of the sea and therefore require special operational conditions.

Category D: Noxious liquid substances which if discharged into the sea from tank cleaning or deballasting operations would present a recognisable hazard to either marine resources or human health or cause minimal harm to amenities or other legitimate uses of the sea and therefore require some attention in operational conditions.

The regulations also list substances which have been evaluated and found to fall outside these categories and to which the regulations do not apply. Other liquid substances may not be carried in bulk unless they have been evaluated.

Special and Particularly Sensitive Sea Areas. AnnexII applies to the Antarctic, Baltic and Black Sea Special Areas and the Particularly Sensitive Sea Areas .



Related articles

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  2. Marpol Annex II -Noxious Liquid Substances in Bulk


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