Double glass coated tank for high temperature water heaters
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United States of America Patent
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Mar 26, 2019
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app pub date -
Sep 25, 2017
filing date -
Sep 25, 2017
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Abstract
A double glass coated steel tank for a high temperature water heater and its method of fabrication is described. The tank is constructed of steel welded parts and fittings are secured to the tank without the presence of sharp edges being formed on the inner surface of the tank not to form any weakness in the composite glass coating to be applied. A first water resistant base coat of cobalt glass enriched with ZIRCON (trademark) is applied to the inner surface and the tank is heat fired at a high temperature in the order of about 1600 degrees F. A second high temperature water resistant glass coat, having a fine gas bubble size not exceeding 10 microns, is applied over the first coat and the tank is heat fired a second time. The composite glass coating thus formed is highly water and corrosion resistant in a water environment of up to at least 190 degrees F.
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