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  • 2016 February 24 11:01

    Cathelco go for USCG Type Approval to live/dead standard for BWT system

    Cathelco have submitted a Letter of Intent to the U.S. Coast Guard verifying readiness to begin testing their ballast water treatment (BWT) system for Type Approval, the company said in its press release.

    The tests will be carried out under FDA/CMFDA methodology where life forms are judged as living/dead, the standard that the U.S. Coast Guard insists must be applied to ballast water treatment systems.

    At the same time, the tests will meet the expected revised standards of the new draft of the IMO G8 Guidelines.

    AMS Certification is an interim designation given to BWT systems approved by a foreign administration. It enables the system to be used on vessels for a period of up to five years, while the treatment system undergoes testing to USCG standards.

    Cathelco have approached Marine Eco Analytics (MEA-nl) to carry out the new testing programme. Based in Den Oever, Holland, the testing facility is in the process of obtaining USCG approval. It has the advantage of being in a coastal location where tests using marine, fresh and brackish water can be performed in real world conditions.

    Land based testing will be followed by testing on board the AS Patria, a container ship built in 2006 which is operated by Ahrenkiel Steamship of Hamburg.

    The Cathelco BWT system is based on a combination of filtration and UV technology. In order to maintain its effectiveness, the system automatically adjusts to different sea water qualities. The Cathelco system uses a UVT sensor to measure UV light transmittance – the amount of UV radiation actually passing through the seawater. This is a very reliable parameter for calculating the UV dose as well as ensuring that power is used economically.

    Other important features of the system are stepless power control, inlet manifolds designed to make the water flow in a helix to increase contact time during irradiation, and a chemical free cleaning system.

    The most recent installation of the system is on board the Harvey Stone (Hull 234) an offshore vessel built by the Eastern Shipbuilding Group Inc., for Harvey Gulf International Marine. The Rampage 6400 multi-purpose field support vessel (MPFSV) with a length of 64.8m and an 18m beam is to be installed with a Cathelco system having a capacity of 150m3/hr.




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