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Procedure for exchanging ballast at sea - bulk carriers guide
Ships ballast tanks allow her to maintain adequate trim, propeller immersion and sufficient stability to proceed safely on a ballast voyage. This is usually between 3045% of the carrier's deadweight carrying capacity.
The nature of their trade usually means that bulk carriers spend half of their life travelling large distances in ballast.
It is estimated that billions of tonnes of water, along with thousands of species of plants, bacteria and othe marine organisms, are transported on ballast voyages each year. Anything that can pass alive through a ship's ballast system can be loaded in the ballast tanks and then transported to another country's territorial waters where that particular organism may not yet exist.
The IMO adopted the International Convention for the Control and Management of Ships' Ballast Water and Sediments (BWM Convention)8 in February 2004. According to this Convention, maritime nations are required to take joint measures to ensure prevention, reduction or elimination of transportation of harmful marine organisms by appropriate management of ships' ballast water and sediments. These measures include rules for the design, control and construction of:
- Methods and systems for ballast water exchange
- sediment control on ships and port reception facilities for sediments when ships' ballast tanks are cleaned or repaired
- designated areas for ballast water exchange
- port reception facilities for receiving ballast water and sediments.
In addition, the following guidelines are also given in the Convention:
- Ballast water sampling
- a ballast water management system, including its development and approval
- use of risk assessment methodology for ballast water management
- ballast water treatment methods and techniques including the design and approval of the systems and equipment used
- dealing with emergencies.
While the BWM Convention is not fully implemented, countries such as the USA, Australia, Ukraine and Brazil already have similar requirements for ships to exchange ballast by either the flow through, sequential or dilution method.
Our detail pages illustrated many safety aspects of Bulk carrier
- Indication of unusual motion or attitude of bulk carriers and risk management / evacuation
- Deterioration of ships structure and consequences of forward flooding
- Handling water ingress problems in bulk carrier, investigation and countermeasures
- Survival and safety procedure for bulk carriers
- Suitability of Shore Terminals for handling bulk cargo
- Preparation for ships carrying bulk cargo & standard loading condition
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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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