Ammonia titanium-exchanged systems

OCEAN THERMAL ENERGY CONVERSION (OTEC). Utilization of ocean temperature differentials between solar-heated surface water and cold deep water as a source of electric power. In tropical areas such differences amount to 35-40°F. A pilot installation now operating near Hawaii utilizes a closed ammonia cycle as a working fluid, highly efficient titanium heat exchangers, and a polyethylene pipe 2000 feet long and 22 inches inside diameter to handle the huge volume of cold water required. Alternate uses for such a system, such as electrolysis of water,... 

Some of the alloys that are protected by anodic protection are stainless steel in phosphoric acid, steel in sulfuric acid, nickel in nitric acid, nickel alloys in nitrate solutions, and titanium in ammonia solution. Recently, anodic protection has been used to protect stainless steel heat exchangers used in the production of sulfuric acid [57]. The current requirement for some of the steels on which anodic protection has been applied is summarized by Sudbury and Locke [58]. Anodic protection has also been used in plants for the manufacture, storage, and transport of sulfuric acid. It reduces the iron dissolution in sulfuric acid to 1 ppm per day of storage. Portable anodic protection systems are used to stop iron dissolution during the transportation of sulfuric acid in trucks [57]. 

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