Appendix 4 IMO Resolution A.868 (20) A4
9 SHIPS’ OPERATIONAL PROCEDURES
9.1 Precautionary practices
9.1.1 Minimizing uptake of harmful aquatic organisms, pathogens and sediments
When loading ballast, every effort should be made to avoid the uptake of potentially harmful aquatic organisms, pathogens and sediment that may contain such organisms. The uptake of ballast water should be minimized or, where practicable, avoided in areas and situations such as:
- areas identified by the port State in connection with advice relating to 8.2.2 above;
- in darkness when bottom-dwelling organisms may rise up in the water column; in very shallow water; or
- where propellers may stir up sediment.
9.1.2 Removing ballast sediment on a timely basis
Where practicable, routine cleaning of the ballast tank to remove sediments should be carried out in mid- ocean or under controlled arrangements in port or dry dock, in accordance with the provisions of the ship’s ballast water management plan.
9.1.3 Avoiding unnecessary discharge of ballast water
If it is necessary to take on and discharge ballast water in the same port to facilitate safe cargo operations, care should be taken to avoid unnecessary discharge of ballast water that has been taken up in another port.
9.2 Ballast water management options 9.2.1 Ballast water exchange
Near-coastal (including port and estuarine) organisms released in mid-ocean, and oceanic organisms released in coastal waters, do not generally survive.
When exchanging ballast at sea, guidance on safety aspects of ballast water exchange as set out in appendix 2 should be taken into account. Furthermore, the following practices are recommended:
- where practicable, ships should conduct ballast exchange in deep water, in open ocean and as far as possible from shore. Where this is not possible, requirements developed within regional agreements may be in operation, particularly in areas within 200 nautical miles from shore. Consistent with 9.1.2 above, all of the ballast water should be discharged until suction is lost, and stripping pumps or eductors should be used if possible;
- where the flow-through method is employed in open ocean by pumping ballast water into the tank or hold and allowing the water to overflow, at least three times the tank volume should be pumped through the tank;
- where neither form of open ocean exchange is practicable, ballast exchange may be accepted by the port State in designated areas; and
- other ballast exchange options approved by the port State.
9.2.2 Non-release or minimal release of ballast water
In cases where ballast exchange or other treatment options are not possible, ballast water may be retained in tanks or holds. Should this not be possible, the ship should only discharge the minimum essential amount of ballast water in accordance with port States’ contingency strategies.
9.2.3 Discharge to reception facilities
If reception facilities for ballast water and/or sediments are provided by a port State, they should, where appropriate, be utilized.
72 ABS GUIDE FOR BALLAST WATER EXCHANGE . 2010
Appendix 4 IMO Resolution A.868 (20) A49 SHIPS’ OPERATIONAL PROCEDURES9.1 Precautionary practices9.1.1 Minimizing uptake of harmful aquatic organisms, pathogens and sedimentsWhen loading ballast, every effort should be made to avoid the uptake of potentially harmful aquatic organisms, pathogens and sediment that may contain such organisms. The uptake of ballast water should be minimized or, where practicable, avoided in areas and situations such as:- areas identified by the port State in connection with advice relating to 8.2.2 above;- in darkness when bottom-dwelling organisms may rise up in the water column; in very shallow water; or- where propellers may stir up sediment.9.1.2 Removing ballast sediment on a timely basisWhere practicable, routine cleaning of the ballast tank to remove sediments should be carried out in mid- ocean or under controlled arrangements in port or dry dock, in accordance with the provisions of the ship’s ballast water management plan.9.1.3 Avoiding unnecessary discharge of ballast waterIf it is necessary to take on and discharge ballast water in the same port to facilitate safe cargo operations, care should be taken to avoid unnecessary discharge of ballast water that has been taken up in another port.9.2 Ballast water management options 9.2.1 Ballast water exchangeNear-coastal (including port and estuarine) organisms released in mid-ocean, and oceanic organisms released in coastal waters, do not generally survive.When exchanging ballast at sea, guidance on safety aspects of ballast water exchange as set out in appendix 2 should be taken into account. Furthermore, the following practices are recommended:- where practicable, ships should conduct ballast exchange in deep water, in open ocean and as far as possible from shore. Where this is not possible, requirements developed within regional agreements may be in operation, particularly in areas within 200 nautical miles from shore. Consistent with 9.1.2 above, all of the ballast water should be discharged until suction is lost, and stripping pumps or eductors should be used if possible;- where the flow-through method is employed in open ocean by pumping ballast water into the tank or hold and allowing the water to overflow, at least three times the tank volume should be pumped through the tank;- where neither form of open ocean exchange is practicable, ballast exchange may be accepted by the port State in designated areas; and- other ballast exchange options approved by the port State.9.2.2 Non-release or minimal release of ballast waterIn cases where ballast exchange or other treatment options are not possible, ballast water may be retained in tanks or holds. Should this not be possible, the ship should only discharge the minimum essential amount of ballast water in accordance with port States’ contingency strategies.9.2.3 Discharge to reception facilitiesIf reception facilities for ballast water and/or sediments are provided by a port State, they should, where appropriate, be utilized.
72 ABS GUIDE FOR BALLAST WATER EXCHANGE . 2010
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