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Ballasting / deballasting guideline for bulk carriers
Seagoing bulk carriers when not carrying cargo or is lightly loaded, sufficient ballast must be carried to ensure that the ships stress, stability, draft, trim and propeller immersion is within permissible limits to guarantee the safe handling of the vessel in the prevailing or expected conditions. In meeting these parameters the vessel must comply, at least, with the requirements of the IMO, Class (especially appendix to Class Certificate) and Port State Authorities.
In 1993 IMO adopted Resolution A.774 (18) Guidelines for Preventing the Introduction of Unwanted Aquatic Organisms and Pathogens from Ships Ballast Water and Sediment Discharges. Masters are to ensure compliance with them.
Micro organism loaded with ballast water
International Convention for the Control and Management of Ships Ballast Water and Sediments (BWM Convention) All around the world more than 10 billion tons of ballast water are carried in ships each year, containing thousands of species of aquatic animals and plants, creating problems for the marine environment and human health, threatening the aquatic flora and economies that depend on healthy aquatic ecosystems.
In February 2004 the IMO has adopted the International Convention for the Control and Management of Ships Ballast Water and Sediments, which is expected to enter into force in early 2012.
Since the adoption of the Convention, IMO has developed a series of guidelines that further clarify the requirements of the Convention. Detailed list can be found in the ABS notice Ballast Water Treatment Advisory. The purpose of the Convention is to regulate discharges of ballast water and to reduce the risk of introducing non-native species that could harm sensitive ecosystems.
In order to show compliance with the requirements of the Convention each vessel shall have on board a valid certificate, a Ballast Water Management Plan and a Ballast Water Record Book. Until the ballast water performance standard D2 becomes compulsory, ship owners are not required, yet encouraged, to install a Ballast Water Treatment System onboard their vessels. As an interim means, referred to as ballast water exchange standard D1, ships have to exchange their ballast water at sea.
Ballast operations must always be carried out within the capabilities of the vessel and its systems.
The Chief Officer is designated to carry out these procedures and maintain all records as required. The Master is to ensure the Chief Officer is familiar with the requirements of this section including IMO Guidelines. The Master must also ensure that all the crew members are given the instruction and are aware of the need for ballast water control procedures and the procedures being adopted on board.
Planning of the ballast operations
Ballast operations are always to be planned in advance by the Chief Officer and entered in the Cargo Loading and Discharge Plan. The plan is to be approved by the Master prior to commencing the operation.
Each vessel must produce a standard plan for a complete change of ballast.
Records and reporting
When taking on ballast waters, the date and time of commencement and completion of the ballast operation, ships position, salinity (specific gravity) and amount of ballast water taken onboard must be recorded in the ships Deck Log Book.
A report in the format shown in the appendix to IMO Guidelines must be completed by the Master and made available to the Port State Authority on request. Analysis certificates, ballast reports and shore receipts must always be kept on board in a separate file.
When the Port State Authority water ballast control requirements (e.g. exchange of ballast at sea) cannot be met during the voyage due to weather condition, operational impracticability, etc, the Master must report this fact to the Company and the prospective Port State Authority prior to entering its national waters (economical zone), so that appropriate alternative action can be arranged.
Controls applied by port state authorities
The Master is to check in advance with the local agent, and the latest Port Guide, for any information on ballast water sediment discharge procedures, being applied by the State Authorities at an expected port of call. These procedures may include, but are not limited, the following control actions:
- The non-release of ballast water;
- Ballast water exchange and sediment removal at sea or in acceptable areas;
- Ballast water management practices aimed at minimising the uptake of contaminated water in ballasting and deballasting operations;
- Discharge of ballast water into shore-facilities.
Failure to comply with national requirements may lead to unnecessary delays for the ship. In some cases penalties may be applied by Ports State Authorities. The vessel may be required to proceed to an approved location to carry out the necessary exchange, seal the ballast tanks against discharge in the Port States waters, pump the ballast water to shore reception facilities, or prove, by laboratory analysis, that the ballast water is acceptable.
Micro organism introduced with ballast water
Loading of ballast water
When loading ballast every effort is to be made to ensure only clean ballast is being taken onboard and the intake of sediment is minimised. Where practicable, vessels are to avoid taking on ballast water in shallow water areas or in the vicinity of dredging operations.
Vessels must not ballast if at all practicable in areas where there is a known outbreak of water communicable diseases or where phytoplankton blooms are occurring.
It is recognised however, that when vessels trade to river or estuary ports, intake of some silts and sediment is unavoidable. In such situations the amount of silt taken on board can often be substantially reduced by planning to ballast on the flood tide when the suspended silt levels are normally lower.
Vessels taking on ballast in river or estuary waters or any other areas where the purity of the water is in doubt, including areas of probable contamination from chemicals, disease, pathogens etc. must follow the control procedures .
When ballast has been loaded in silted or otherwise polluted water, the ballast is to be changed as soon as possible after leaving that port. It is also essential that this is carried out to prevent the build up of mud in ballast tanks which may reduce the vessels cargo lifting capacity.
Whenever possible the initial filling of the ballast tanks should be run in from the sea by gravity, in preference to pumping it in. In general, ballast tanks are to be filled to 100% capacity, but not be overflowed.
Untreated ballast water can destroy local eco system
Discharge of ballast water
No ballast is to be discharged in the continental shelf, coastal or port waters where ballast water and sediment control measures are being applied by State Authorities, the ballast water and sediment control procedures have been followed, or acceptable alternatives have been adopted.
The effectiveness of the vessels procedures may be verified by Port State Authorities taking samples of ballast water and/or sediments from the vessel, to test for the continued survival of unwanted aquatic organisms and pathogens. Such samples may also be taken from suction wells, chain lockers and other areas where sediment may accumulate. In certain cases discharge of ballast will not be permitted until analysis of such samples is completed. The Master is to ensure that relevant written authorisation is obtained from the Port Authority prior to discharging any ballast to coastal waters of any country that exercises ballast control measures.
Shortly after commencement and during discharge of any ballast overboard the surface of the sea is to be checked frequently to guard against accidental pollution.
How to prevent water hammer and surging during regular ballast operations ?
Ballasting by gravity, by water ballst pumps & priming procedure
De- Ballasting by gravity, by water ballst pumps & priming procedure
Ballast exchange procedure at sea
Practical method for the control of transportation of harmful marine organisms
Safety precautions during ballast operation
Loading of high density cargo and water ballast distribution for bulk carriers
Regulation of pumping system of bulk carriers
Regulation of pumping system of bulk carriers
Cargo and ballast handling guide
Risk of partially filled ballast tanks
Handling water ingress problems in bulk carrier, investigation and countermeasures
Our detail pages illustrated many safety aspects of Bulk carrier
- MARPOL 73/78
- IMO Resolution A.774 (18) Guidelines for Preventing the Introduction of Unwanted Aquatic Organisms and Pathogens from Ships Ballast Water and Sediment Discharged
- Ships Procedure and Arrangements manual (Approved by Class)
- Guide to Port Entry
- US NPDES Vessel General Permit Compliance Manual
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Operation of sea going bulk carriers involved numerous hazards . Careful planning and exercising due caution for all critical shipboard matters are important . This site is a quick reference to international shipping community with guidance and information on the loading and discharging of modern bulk carriers so as to remain within the limitations as specified by the classification society.
It is vital to reduce the likelihood of over-stressing the ship's structure and also complying with all essential safety measures for a safe passage at sea. Our detail pages contain various bulk carrier related topics that might be useful for people working on board and those who working ashore in the terminal. For any remarks please Contact us
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