User Guide and Specifications for Baked Phenolic Coating Systems Applied to Domestic Hot Water Heat Exchangers

摘要

Most domestic water storage heaters used in the Army consist of a removable U-tube bundle installed in the lower half of a horizontal or vertical cylindrical boiler tank. The copper U-tube bundle used in cement-lined carbon steel tanks requires periodic removal and acid cleaning to remove the excessive scale formation on the water-side surfaces of the tube bundle. Total softening of the water to remove scale is not feasible because it renders the water corrosive to the piping system. To ensure water potability and to protect human health, scale dispersants are prohibited in such systems. This study adapted a phenolic coating for use on tube bundles exposed to corrosive and scale conducive environments to protect the copper tubing in the heat exchanger.