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26 Aug 2025 / Australia

Use of exhaust gas cleaning systems in Australian waters

The Australian Maritime Safety Authority (AMSA) has issued guidance on using an exhaust gas cleaning system (EGCS) to meet the fuel sulphur limit of 0.50% m/m.

In its Marine Notice 2025/04 , AMSA states that the sulphur limit is required by the International Convention for the Prevention of Pollution from Ships (MARPOL) Annex VI and Australia’s domestic law.

In Australia, use of an EGCS as an alternative way to comply with the low sulphur fuel requirements is allowed under section 26FEGA of the Protection of the Sea (Prevention of Pollution from Ships) Act 1983.

To comply, your EGCS must currently be:

  • approved by the vessel’s flag State Administration, or a Recognised Organisation appointed by the flag State
  • operated in accordance with International Maritime Organization (IMO) requirements, including the 2021 Guidelines for Exhaust Gas Cleaning Systems (resolution MEPC.340(77)). (IMO Guidelines).

All EGCS types (open-loop, closed-loop, hybrid) operated in Australian waters are subject to the same discharge water standards.

You may release discharge water from EGCS in Australian waters. All discharges must meet the discharge water quality criteria in the IMO Guidelines, and as amended from time to time. This includes discharges in waters within:

  • Australia’s Particularly Sensitive Sea Area (PSSA)
  • areas within the MARPOL ‘nearest land’ boundary, including the Great Barrier Reef Marine Park.

Some port authorities may encourage vessels not to release discharge water within port limits. You should contact the specific port Authority prior to discharge.

EGCS sludge and residues must be disposed of at port reception facilities. They:

  • must not be discharged at sea
  • must not be incinerated onboard.

When operating an EGCS, you must ensure:

  • crew members are familiar with correct operation of EGCS
  • the system is kept in good working order and maintenance is up to date
  • monitoring devices are fully functional
  • records are available for inspection, including:
    - EGCS approval documents
    - operational and maintenance records for the EGCS.

Records must be kept onboard the vessel and provided on request of a Port State Control Officer (PSCO).

If your EGCS malfunctions, you must take immediate action and may need to report it.

Step 1: Try to fix the malfunction
Identify and fix the issue as soon as possible. If it’s a one-off malfunction and you can fix it within one hour, you don’t need to report it.

Step 2: Switch to compliant fuel oil and report the malfunction
If the EGCS malfunction lasts more than one hour or happens repeatedly, you must:
- change over to compliant fuel oil
- report the malfunction to the vessel’s flag State Administration and the Competent Authority of the port State of the vessel's destination.
Your report should explain the steps you are taking to address the issue.

Step 3: If you don’t have enough compliant fuel oil
If the vessel doesn’t have sufficient compliant fuel oil to reach the port of destination, you must:
- include this in your report
- outline the vessel's proposed course of action for agreement by the flag State Administration and Competent Authority for their agreement, which might include bunkering compliant fuel oil at the next port, or carrying out repairs.
Where this occurs on an Australian vessel or a foreign vessel within Australian waters, you must email the report to [email protected].

Any EGCS that does not comply with IMO Guidelines in any respect (including but not limited to the discharge water quality criteria) may be prohibited from use in Australian waters.

For information about operations in Australia, contact GAC Australia at [email protected]

If quoting any content from Hot Port News, please cite GAC Hot Port News as the source.

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