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Exhaust Gas Cleaning Systems

Annex VI of the International Convention for the Prevention of Pollution from Ships (MARPOL Annex VI) allows ships to use exhaust gas cleaning systems (EGCS) to comply with the 0.50 per cent m/m sulphur fuel oil limit that commenced on 1 January 2020.

Australia’s approach to exhaust gas cleaning systems

As a party to MARPOL Annex VI, Australia permits the use of EGCS to comply with the low sulphur fuel oil limit, provided the:

  • system is approved by the ship’s flag State, or a recognised organisation appointed by the flag State
  • system is operated in accordance with IMO requirements, including the IMO 2015 Guidelines for Exhaust Gas Cleaning Systems (resolution MEPC.259(68))
  • crew are trained on the use of the system and the system is kept in good working order, with maintenance up to date and monitoring devices fully operational
  • EGCS approval documents, as well as operational and maintenance records for the EGCS are maintained on board the ship and made available for inspection upon Port State Control Officer (PSCO) request
  • following information about the ship's EGCS is provided to AMSA at EGCS@amsa.gov.au before the first arrival at an Australian port after installation and approval of the EGCS. This information should be resubmitted to AMSA if the provided information changes:
    • Ship name (in email subject title)
    • IMO number
    • Arrival port
    • Arrival date
    • EGCS Scheme A or Scheme B approval
    • Make and model of EGCS
    • Open-loop, closed-loop or hybrid-type system
    • Results of all wash water testing that has been undertaken in accordance with Appendix 3 of the IMO 2015 Guidelines for Exhaust Gas Cleaning Systems.
      • Wash water testing should be conducted upon commissioning of the EGCS and repeated every twelve months. Ships may be directed not to discharge wash-water from an EGCS in Australian waters if this data, or evidence that samples have been taken for analysis, cannot be provided to AMSA before arrival at the first Australian port.

Any EGCS found to be non-compliant with IMO guidelines in any respect (including but not limited to the wash water discharge criteria) may be prohibited from use in Australian waters.

Further information on Australia’s approach to the use of an EGCS to support compliance with the 2020 low sulphur limit can be found in Marine notice 2/2021—Requirements for the use of Exhaust Gas Cleaning Systems in Australian Waters and reporting to AMSA.

EGCS wash water

Further work is being undertaken through the International Maritime Organization (IMO) and by AMSA on the potential long-term impacts of cumulative wash water discharges, including in areas with high shipping density and with poor tidal flushing.

While the discharge of wash water from ECGS is currently permitted in Australian waters, ship owners, operators and Masters are encouraged to avoid discharging wash water within Australian port limits. 

Work by the IMO

The IMO 2015 Guidelines for Exhaust Gas Cleaning Systems outlines requirements for the testing, certification and verification of EGCS, including wash water discharge and monitoring criteria. The IMO Marine Environment Protection Committee (MEPC) is currently working on an updated version. Once adopted, the updated Guidelines will only apply to new installations; existing EGCS approved in accordance with the 2015 Guidelines do not need to be approved again.

The IMO's Pollution Prevention and Response Sub-Committee (PPR) is also working to evaluate and harmonise rules and guidance on discharges from EGCS. This work aims to address concerns over the potential negative impact on the marine environment and the measures that have been put in place in some areas to prohibit wash water discharge. 

Work by AMSA

AMSA is currently investigating the potential impacts of EGCS wash water discharges on Australian port environments. 

Initial advice from the Commonwealth Scientific and Industrial Research Organisation (CSIRO) indicates that dilutions of wash water discharge by the receiving environment will adequately reduce all contaminant concentrations to below water quality guidelines applied in Australia and New Zealand. 

We have also commissioned a study to assess the cumulative effects of EGCS wash water discharges to identify any potential long-term impacts for the Australian marine environment. The outcomes of this study will inform whether any future restrictions on the use of EGCS in Australian waters may be required. 

Last updated: 

Wednesday 18 August 2021