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Prevention of Pollution from Ships

The Marine Environment Protection Committee (MEPC) is the International Maritime Organization's senior technical body concerned with the prevention and control of pollution from ships. It is aided in its work by a number of subcommittees. The Department participates in the work of the Committee and a number of its subcommittees. The Australian Maritime Safety Authority (AMSA) leads Australia's work in the MEPC. Further details are provided on the AMSA website.

  • MARPOL

The most important convention regulating and preventing marine pollution by ships is the International Maritime Organization's International Convention for the Prevention of Pollution from Ships, 1973, as modified by the Protocol of 1978 relating thereto (MARPOL 73/78). The technical requirements of this Convention are included in six separate Annexes:

  • Annex I - Regulations for the Prevention of Pollution by Oil
  • Annex II - Regulations for the Control of Pollution by Noxious Liquid Substances in Bulk
  • Annex III - Regulations for the Prevention of Pollution by Harmful Substances Carried by Sea in Packaged Form
  • Annex IV - Regulations for the Prevention of Pollution by Sewage from Ships
  • Annex V - Regulations for the Prevention of Pollution by Garbage from Ships
  • Annex VI - Regulations for the Prevention of Air Pollution from Ships

The legislation giving effect to MARPOL 73/78 in Australia is the Protection of the Sea (Prevention of Pollution from Ships) Act 1983 and the Navigation Act 1912, and parts of several Marine Orders made under this legislation.

  • Annex I - Prevention of Pollution by Oil

Annex I allows for specific discharges of oil from tankers only when certain conditions are met. In addition, the maximum quantity of oil permitted to be discharged on a ballast voyage of oil tankers is limited and applies equally both to persistent and non persistent oils.

Annex I also defines "Special areas" which are considered to be so vulnerable to pollution by oil that oil discharges within them have been completely prohibited, with minor and well defined exceptions.

Annex I entered into force internationally on 2 October 1983 and for Australia on 14 January 1988. On 15 October 2004 the Marine Environment Protection Committee of the IMO adopted a revised version of Annex I which entered into force both internationally and for Australia on 1 January 2007.

The revised MARPOL Annex I incorporates the various amendments adopted since MARPOL entered into force in 1983, including the phasing-in of double hull requirements for oil tankers. It also separates the construction and equipment provisions from the operational requirements and makes clear the distinctions between the requirements for new ships and those for existing ships. The revision provides a more user-friendly, simplified Annex I.

  • Annex II - Prevention of Pollution by Noxious Liquid Substances in Bulk

Annex II details the discharge criteria and measures for the control of pollution by noxious liquid substances carried in bulk.

Some 250 substances were evaluated and included in the list appended to the Convention. The discharge of their residues is allowed only to reception facilities unless certain concentrations and conditions (which vary with the category of substances) are complied with.

No discharge of residues containing noxious substances is permitted within 12 miles of the nearest land. More stringent restrictions apply to the Baltic and Black Sea areas.

Annex II entered into force internationally on 6 April 1987 and for Australia on 14 January 1988.
On 15 October 2004 the Marine Environment Protection Committee of the IMO adopted a revised version of Annex II which entered into force both internationally and for Australia on 1 January 2007.

The revised Annex II includes a new four-category categorization system for noxious and liquid substances. In addition, improvements in ship technology, such as efficient stripping techniques, have made possible significantly lower permitted discharge levels of certain products. For ships constructed on or after 1 January 2007 the maximum permitted residue in the tank and its associated piping left after discharge will be set at a maximum of 75 litres for products in categories X, Y and Z - compared with previous limits which set a maximum of 100 or 300 litres, depending on the product category.

  • Annex III - Prevention of Pollution by Harmful Substances Carried by Sea in Packaged Forms

Annex III contains general requirements for the issuing of detailed standards on packing, marking, labelling, documentation, stowage, quantity limitations, exceptions and notifications for preventing pollution by harmful substances.
Annex III entered into force internationally on 1 July 1992 and for Australia on 10 January 1995.

  • Annex IV - Prevention of Pollution by Sewage from Ships

Annex IV deals with the discharge of sewage into the sea, ships' equipment and systems for the control of sewage discharge, the provision of facilities at ports and terminals for the reception of sewage, and requirements for survey and certification.

It is generally considered that on the high seas, the oceans are capable of assimilating and dealing with raw sewage through natural bacterial action and therefore the regulations in Annex IV of MARPOL prohibit ships from discharging sewage within a specified distance of the nearest land, unless they have in operation an approved treatment plant.

Annex IV entered into force internationally on 27 September 2003 and for Australia on 27 May 2004. It is expected that a revised text of Annex IV of MARPOL will enter into force internationally within the next few years. Australia is moving towards implementation with legislative proposals being developed for national discharge standards.

  • Annex V - Prevention of Pollution by Garbage from Ships

Annex V deals with different types of garbage and specifies the distances from land and the manner in which they may be disposed of. The requirements are much stricter in a number of "special areas". The Annex imposes a complete ban on the dumping into the sea of all forms of plastic.

Annex V entered into force internationally on 31 December 1988 and for Australia on 14 November 1990.

The Marine Environment Protection Committee (MEPC) at its 55th session in October 2006 established an intersessional correspondence group to develop the framework, method of work and timetable for a comprehensive review of MARPOL Annex V Regulations for the prevention of pollution by garbage from ships and the associated Revised Guidelines for the implementation of MARPOL Annex V. The review will take into account resolution 60/30 of the UN General Assembly, which invited IMO to review MARPOL Annex V, in consultation with relevant organizations and bodies, and to assess its effectiveness in addressing sea-based sources of marine debris.

  • Annex VI - Prevention of Air Pollution from Ships

The Annex sets limits on the emissions of nitrogen oxide (NOx) from diesel engines, requires ships to avoid using fuel with sulphur content exceeding 4.5% by mass, prohibits deliberate emissions of ozone depleting substances and prohibits the incineration of certain products on board ships. Furthermore, if a ship is within a sulphur oxides (SOx) Emission Control Area it has to use either a fuel with a sulphur content not exceeding 1.5% by mass, an exhaust gas cleaning system or any other mechanism to limit SOx emissions.

In September 1997, the IMO adopted the text of a new Annex VI dealing with air pollution on ships. Annex VI entered into force internationally on 19 May 2005. Annex VI entered into force in Australia on 7 November 2007.

 


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Last Updated: 18 August, 2008