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51314-3818-Corrosion Control Issues for Marine Vessel Copper-Nickel Boxcoolers

Picture for Corrosion Control Issues for Marine Vessel Copper-Nickel Boxcoolers
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Product Number: 51314-3818-SG
ISBN: 3818 2014 CP
Author: Gareth John
Publication Date: 2014
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Copper-Nickel (CuNi) alloys have good corrosion resistance and natural fouling resistance in seawater and are used extensively for seawater systems including heat exchangers. For smaller marine vessels (for example tugs support vessels etc) the heat exchanger tubes are simply placed inside a seachest open to the sea to allow cooling creating a box cooler arrangement.To maintain the natural anti-fouling properties the CuNi needs to be isolated from the vessels cathodic protection system.  However depending on the configuration of the cooler and seachest as well as the position of the cathodic protection anodes within the seachest isolated coolers can be at risk of stray current corrosion problems. As the tube walls are thin even low rates of corrosion should be avoided.The paper will describe the overall problems encountered and methods developed to prevent stray current corrosion damage whilst maintaining the natural marine fouling resistance of the CuNi.
Copper-Nickel (CuNi) alloys have good corrosion resistance and natural fouling resistance in seawater and are used extensively for seawater systems including heat exchangers. For smaller marine vessels (for example tugs support vessels etc) the heat exchanger tubes are simply placed inside a seachest open to the sea to allow cooling creating a box cooler arrangement.To maintain the natural anti-fouling properties the CuNi needs to be isolated from the vessels cathodic protection system.  However depending on the configuration of the cooler and seachest as well as the position of the cathodic protection anodes within the seachest isolated coolers can be at risk of stray current corrosion problems. As the tube walls are thin even low rates of corrosion should be avoided.The paper will describe the overall problems encountered and methods developed to prevent stray current corrosion damage whilst maintaining the natural marine fouling resistance of the CuNi.
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