Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1989-04-26
1989-11-14
Favors, Edward G.
Metal working
Method of mechanical manufacture
Assembling or joining
29458, 29469, 228184, 204197, 122 13R, 126361, B21D 5300, B23P 1526, B21K 2900
Patent
active
048798010
ABSTRACT:
A cathodically protected water heater which eliminates the need of a conventional anode rod. The water heater tank includes a cylindrical shell enclosed by upper and lower heads and a flue which is mounted within openings in the lower and upper heads. The outer surface of the flue as well as the upper surface of the lower head is coated with a metal anodic to steel, and the metal coating on the flue extends continuously from the lower head to a location above the upper head. The remainder of the inner surface of the heater is also coated with the anodic metal. The anodic metal is applied in a sufficient thickness at least at the junction of the lower end of the peripheral flange of the upper head and the shell to bridge and seal the crevice opening which typically exists between the free end of the upper head flange and the shell wall. The coating over the crevice hydraulically seals the exterior weld between the upper head and shell from water contained in the heater and provides a corrosion barrier and anodic surface to contained water. Where welds are provided through the metal coating at the upper head/flue and shell/lower head junctions, the metal coating flows about the welds to also hydraulically seal them off from contained water and provide a corrosion barrier and anodic surface to contained water.
REFERENCES:
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patent: 2428526 (1947-10-01), Osterheld
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patent: 4109684 (1978-08-01), Fernandez
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Chevalier James L.
Pow Edwin C.
Stubbe James S.
A. O. Smith Corporation
Favors Edward G.
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