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Ballast Requirements
Vessels are to maintain deep sea ballast on arrival, until safely berthed alongside the allocated berth.
For safe navigation, the ship’s propeller should be immersed, the bow should be deep enough for adequate vision from the bridge and draft should be suitable for the vessel size in order to minimise leeway (see table below).
Vessels which cannot meet the criteria for minimum draft may be delayed if wind conditions are unfavourable.
| Table of Recommended Minimum Draft/Maximum Trim | |||
| DWT | FWD Draft (m) | AFT Draft (m) |
Maximum Trim (m) |
| up to 10,000 | 2.0 | No more than 0.6 of the propeller to be exposed |
- |
| 10,000 - 20,000 | 2.5 - 3.0 | No more than 0.6 of the propeller to be exposed |
- |
| 20,000 - 30,000 | 3.0 - 4.0 | No more than 0.6 of the propeller to be exposed |
- |
| 30,000 - 40,000 | 4.0 - 5.0 | 6.5 - 7.0 | 3.0m by the stern |
| 40,000 - 50,000 | 5.0 - 6.0 | 7.5 - 8.0 | 3.0m by the stern |
| 50,000 - 70,000 | 6.0 - 7.0 | 8.0 - 8.5 | 2.5m by the stern |
| 70,000 - 90,000 | 7.0 - 8.0 | 8.5 - 9.0 | 2.0m by the stern |
The Port of Portland Pty Limited requests that all vessels arriving from overseas undertake, whenever possible, the voluntary compliance on ballast water exchange during mid voyage, if they have need to discharge significant quantities of seawater ballast in this Port.
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