The U.S. Navy has used galvanized steel ducting in Surface Ship ventilation systems for many years. Overall performance of this material in service has been acceptable, but excessive corrosion has been obsmved at weather openings and at locations where water colleets. The corrosion observed could be attributed to design problems, such as improper placement of weather intakes and lack of low point drains, or to use of a ducting material which is incompatible with the serviee environment. Besides the cost associated with ducting replacements, seawater ingestion and duct corrosion can cause personnel hazards fkom projected debris and electrical arcs at switchboards. This paper discusses the various configurations and design issues considered in reeent corrosion control evaluations of these systems. The benefits and problems associated with material optionsj including stainless steels, textiles, and composites, is discussed. A cost benefit analysis for some of these options is included.
Keywords: ventilation ducting materials, weather intakes