to demonstrate further due diligence in their ballast water management practices. The tiered notations BWT and BWT+
will bring the ballast water treatment system under survey, wherein the class society will review the system for compliance with the Guide, confirm the installation design, conduct a survey during installation, periodically evaluate the onboard ballast water management system and perform shipboard function tests. The BWT+ notation signifies that the installed treatment system has been surveyed by an ABS surveyor at the manufacturing facility. Another international classification
society, Bureau Veritas, has also recently published a comprehensive set of guidelines on Ballast Water Management
Systems. Its Guidance Note NI 538 is similarly intended to help ship owners, shipyards and equipment manufacturers facing complex choices when deciding how to implement the IMO Convention on ballast water management and also local rules on ballast water which apply in some areas of the world. The guidance note clarifies the requirements of
the Convention and
shows the alternative systems and processes which can be adopted to meet the requirements. The advantages and disadvantages of different treatment measures are explained. Jean-Francois Segretain, deputy
technical director, Bureau Veritas Marine Division, says: “Ballast water management is becoming a major challenge for ship owners. Tere is some uncertainty over
the exact implementation dates of the convention, and there is also a growing patchwork of local regulation, with the possibility of even more stringent rules on ballast in the USA. But, one thing is certain, ship owners will very soon have to have in place a means of meeting very strict ballast water conditions.” Tere are a number of ways to meet
stringent standards on ballast water, but not all are as yet proven technology. Segretain adds: “That is why we are publishing these guidelines now, to draw attention to what needs to be done and to provide some clarity on the choices facing owners and operators.” The Guidance note covers requirements for the ship and for type-testing of treatment systems and also the elements of a Ballast Water Management plan. SRCT
Sicure harnesses scanning technology Siemens is adopting 3D scanning technology to assist retrofits.
S
iemens Water Technologies has developed a ballast water treatment system, Sicure, which last year
successfully achieved preliminary IMO approval. Based around the company’s tried and tested Chlorpoac biofouling control system, Sicure is a three phase process using filtration, electro-chlorination and demand- regulated control logic. The filter in the Sicure ballast water
management system removes or breaks down larger organisms using a 40micron weave wire screen, and provides non-stop operation at high sediment loads while minimising backwash flow. The patent pending biofouling control provided to the filter is designed to enhance reliability while minimising the system’s maintenance requirements. For electro-chlorination, the system uses
sodium hypochlorite, which has been used for many years to prevent marine growth in the seawater piping and heat transfer systems of
land-based, offshore and shipboard installations. Proprietary control
logic
monitors the chlorine dose level necessary to provide the required level of efficacy. Te biocide dosing level is variable and depends on ballast water conditions.
A computer generated 3D scan image showing the engine room of an existing container vessel with a 750m3
/h ballast water pump. Siemens is currently equipping a
new vessel, a 13,100TEU capacity containership, with a 1500m3
/h Sicure
system. According to Lars Nupnau, Siemens’ ballast water treatment product manager: “While this is a newbuild, the project fits the characteristics of a retrofit, since the system was designed in an already existing ship design that did not account for ballast water treatment. Te
Shiprepair and Conversion Technology 1st Quarter 2012
modular configuration of the Sicure system was an enormous advantage for this task.” For retrofit applications Siemens has
adopted 3D scanning technology, as used in other industries, to design the Sicure system into situations where there is virtually no free space in the engine room. Tis technology is expected to be invaluable as the retrofit market increases with the ratification of the IMO’s regulations on ballast water. SRCT
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