Protection from corrosion by water is the most important single item of preventive maintenance in petroleum refineries. This problem is encountered in innumerable forms and no one solution satisfies all the requirements of even a single refinery, let alone the needs of different plants. The broad field of protection from water corrosion takes in such widely differing situations as underground storage tanks which are to be spared attack from soil water, prevention of corrosion in heat exchangers due to sweet or brackish cooling water, and in steam boilers due to softened water, and protection of exposed metallic structures from rain water, etc.
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