Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1975-03-24
1976-11-30
Tung, T.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
204280, C23F 1300
Patent
active
039947955
ABSTRACT:
Fracturing of arcuate anode segments per se or of an anode section of a sacrificial anode during installation of bracelet-type anodes about a pipeline to be cathodically protected is minimized. Distortion of the anode segment during cooling of the metal after casting the segment is also minimized. The minimizing of the distortion and fracturing of the anode segments is attained in certain embodiments of the invention, for a given pipeline of a certain diameter, by the arcuate-shaped anode segments each being of an arc length which is not above a predetermined maximum arc length in the range of about 14 inches to about 27 inches. The sacrificial anode assembly comprises an even-numbered plurality in the range of 4 to 8 of the arcuate-shaped anode segments secured about the pipeline in pipe-embracing relationship thereto, such plurality of anode segments being 4 anode segments for a pipeline of pipe diameter in the range of about 20 inches to about 36 inches, 6 anode segments for a pipeline of pipe diameter in the range of about 30 inches to about 54 inches, 8 anode segments for a pipeline of pipe diameter in the range of about 40 inches to about 72 inches, 4 or 6 anode segments for a pipeline of pipe diameter in the range of about 30 inches to about 36 inches, and 6 or 8 anode segments for a pipeline of pipe diameter in the range of about 40 inches to about 54 inches. The maximum arc length of each anode segment is determined prior to its casting and installation on the pipeline by the formula: ##EQU1## WHEREIN D is the diameter of the pipeline in inches and n is the total number of anode segments in the assembly.
REFERENCES:
patent: 3001924 (1961-09-01), Battis et al.
patent: 3623968 (1971-11-01), Bohne
patent: 3870615 (1975-03-01), Wilson et al.
patent: R27529 (1972-12-01), Doremus et al.
ASARCO Reprint from Federated Metals Digest, 1958, pp. 1 & 2, 204-197.
Drew R. J.
Federated Metals Corporation
Schaffer E. J.
Tung T.
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