MARPOL Annex 1: Regulations for the Prevention of Pollution by Oil

MARPOL Annex 1, which came into force on October 2, 1983, regulates the prevention of pollution by oil, a significant concern given the 2,900 million tons of crude oil transported annually across seas. Oil pollution arises from operational causes like negligence during cleaning or tank operations, and accidental causes such as grounding or collisions.

Oil pollution severely impacts marine environments. It forms a surface blanket, impeding oxygen exchange, and its heavier components settle on the seafloor, inhibiting marine life growth. Toxic oil elements enter the food chain, affecting organisms from small fish to humans. Additionally, oil can foul beaches, contaminate water inlets, and render seabirds helpless.

Special areas are designated sea regions with unique oceanographic, topographic, or ecological characteristics and high traffic density, requiring special mandatory methods to prevent sea pollution. Annex 1 lists 10 such areas, including the Mediterranean Sea, Baltic Sea, Red Sea, Persian Gulf, Black Sea, Gulf of Aden, Antarctic Area, Northwest European waters, Oman area of the Arabian Sea, and Southern South African waters, which have specific regulations for ships.

Discharge criteria for vessels of 400 gross tonnage and above differ based on location. Outside special areas, ships must be on route, process oily mixtures through filtering equipment, and ensure oil content doesn't exceed 15 ppm, with an alarm and automatic stoppage system for exceedances. Discharges cannot originate from cargo pump rooms or be mixed with cargo residues. In special areas, the same rules apply, except in the Antarctic, where any discharge of oil or oily mixtures is strictly prohibited.

For oil tankers outside special areas, discharge must occur more than 50 nautical miles from land, while on route. The instantaneous discharge rate cannot exceed 30 liters per nautical mile. Total oil discharged must not exceed 1/15,000 of the total cargo for ships delivered before 1979, and 1/30,000 for those delivered after 1979. Vessels must be equipped with an Oil Discharge Monitoring and Control System (ODMCS) and slop tank arrangements. Within special areas, all discharges of oil or oily mixtures from the cargo area are completely prohibited.

The Oil Record Book (ORB) is a critical document, divided into two parts. Part One (machinery space operations) is for oil tankers of 150 gross tonnage and above, and all other ships of 400 gross tonnage and above. Part Two (cargo and ballast operations) is for all oil tankers of 150 gross tonnage and above. The ORB must be readily available for inspection and preserved for three years, recording operations like ballast/cleaning of tanks, residue disposal, bilge water discharge, and bunkering.

Every oil tanker of 150 gross tonnage and above, and every ship of 400 gross tonnage and above, must carry an administration-approved Shipboard Oil Pollution Emergency Plan (SOPEP). This plan outlines procedures for reporting incidents, lists contact authorities, details immediate actions to control discharge, and provides contacts for coordinating with national and local authorities during pollution combat.

An International Oil Pollution Prevention (IOPP) Certificate is required for oil tankers of 150 gross tonnage and above, and other ships of 400 gross tonnage and above. Issued by the administration for a maximum of five years, it is supplemented by Form A for non-oil tankers and Form B for oil tankers.