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BALLAST WATER TECHNOLOGY BALPURE system into small sub assemblies minimizes re- quirements for other equipment relocation and additional en-gineering/ship re-designs ? allowing small available spaces to be used in various machinery/engine spaces. Final tting, installation, commissioning and testing can be accomplished at sea or quayside. In situ sodium hypochlorite-based ballast water treatment systems share common treatment principles. Not all are capable of performing in extreme cold water con- ditions. Electrolytic technology functions optimally above 15°C seawater feed. The technology does not function at all below 5°C. Warmer supply water temperatures signi cantly reduce the power demand for the electrolytic process (90% of the power consumption). The advantage of the BALPURE slip stream treatment approach is that this stream can be eas-ily heated from low pressure steam, electric heaters or thermal oil systems to signi cantly improve the hypochlorite produc- tion rate, extend the life of the electrodes, and reduce power consumption. Approvals and USCG certi cationBALPURE received IMO Type Approval in July 2011. BALPURE has type approval from Bureau Veritas as well as a certi cate of design assessment from ABS, with type approval applications in process with several other classi cation societ- ies. Formal submittal to the U.S. Coast Guard (USCG) for the designation of its BALPURE ballast water treatment system as an Alternate Management System (AMS) has been made. If accepted, the Type Approved ballast water treatment system could be used onboard vessels in US waters. Caveats Vessels traveling in primarily fresh water environments would need to carry brine in order for the system to work cor- rectly and the colder the temperature of the seawater, the more heat would have to be applied. Severn Trent de Nora therefore does not market the technology to ?Lakers.? The manufactur- er is looking at designing a smaller system to accommodate smaller market vessels. The Company Severn Trent De Nora?s The Tech Filtration/ChlorinationThe Skinny Severn Trent De Nora has in- stalled/sold 18 systems over the past 15 months since receiv-ing IMO Type Approval in July 2011. 5 have been installed. All of the contracts have been for new builds. www.severntrentdenora.com 54 | Maritime Professional | 4Q 2012MP #4 50-63.indd 54MP #4 50-63.indd 5411/12/2012 10:10:16 AM11/12/2012 10:10:16 AM
