Ballast Water Treatment Systems (BWTS) particularly in tankers are faced with very unique and specific challenges with regards to the classification of hazardous areas and their installation requirements. Hazardous areas are defined as areas in which a flammable or explosive gas and air mixtures is, or may normally be expected to be, present in quantities such as to require special precautions for the construction and use of electrical equipment and machinery. Given that the ballast tanks in tankers are typically located adjacent to a cargo oil tanks, by definition ballast water is considered a hazardous substance. Therefore, BWTS installation in tankers will be subject to specific hazardous area installation requirements. This paper will identify specific installation requirements and considerations for BWTS installations in hazardous areas, and will provide installation scenarios which will highlight compliance with this specific requirements and various interpretations of different Flag States and Classification societies.

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