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Long-Term Cost Saving By Using High Alloyed Stainless Steel In Seawater Coolers

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Copper alloys such as copper nickel (CuNi) and Admiralty Brass (CuZn) are often successful material selections for seawater coolers. The copper alloys successes in these highly corrosive environments can be attributes to the ability of copper to form a protective scale, thus stopping corrosion of the material. On copper alloys in seawater, the protective scale formed comprises a mix of cuprous oxide (Cu2O), copper oxide (CuO) and copper hydroxy chlorides.

Product Number: 51322-17544-SG
Author: Jonas Höwing
Publication Date: 2022
Industries: Corrosion Monitoring and Control , Coatings and Linings , Coatings
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A refinery has for decades been using tubes in CuNi 70/30 for several seawater cooled heat exchangers. Over the years the refinery has been facing a lot of corrosion issues with these heat exchangers, leading to frequent leakages, plugging of tubes and ultimately complete retubing of the tube bundles. Apart from high maintenance costs, this also leads to production losses with associated lost earnings. This paper will show the long-term cost of the CuNi 70/30 heat exchanger solution, and compare this to an initially more expensive stainless steel solution but which has a lower long-term maintenance cost. The cost calculations are based on data supplied from fabricators, material suppliers and end-users.

A refinery has for decades been using tubes in CuNi 70/30 for several seawater cooled heat exchangers. Over the years the refinery has been facing a lot of corrosion issues with these heat exchangers, leading to frequent leakages, plugging of tubes and ultimately complete retubing of the tube bundles. Apart from high maintenance costs, this also leads to production losses with associated lost earnings. This paper will show the long-term cost of the CuNi 70/30 heat exchanger solution, and compare this to an initially more expensive stainless steel solution but which has a lower long-term maintenance cost. The cost calculations are based on data supplied from fabricators, material suppliers and end-users.

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