C - Chemistry – Metallurgy – 23 – F
Patent
C - Chemistry, Metallurgy
23
F
204/88
C23F 13/02 (2006.01) C23F 13/06 (2006.01)
Patent
CA 1330318
14 Abstract of the Disclosure An existing metallic tank with a corroded bottom is improved by replacing the original bottom with a new bottom above the original, and using the original tank bottom to cathodically protect the new tank bottom. A closed loop of material is removed from the original bottom close to the perimeter thereof, thus electrically isolating the tank from the remainder of the original bottom. An insulated cable is connected to the remainder of the original bottom, and an electrically insulative medium such as polyethylene tape is applied to the inside surface of the remainder of the original bottom in an unbroken pattern which includes the location where the cable is connected, thus shielding portions of the remainder under the insulative medium from being anodically sacrificed. This allows the shielded portions to function as current headers to carry current to the unshielded portions of the remainder of the original tank bottom. Fill material is placed above the original bottom, and a new metallic bottom is installed above the fill material, in electrical communication with the rest of the original tank. A direct current is then impressed between the insulated cable and the rest of the original tank, with the insulated cable being positive.
564467
Corrosion Service Company Limited
Sim & Mcburney
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