Method and apparatus for determining interactions due to direct

Details Method and apparatus for determining interactions due to direct Method and apparatus for determining interactions due to direct

1990-12-21

1992-09-01

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

324713, 324 711, 204404, G01R 2708

Patent

active

051442531

ABSTRACT:
The method of determining interactions due to direct currents on adjacent buried metal structures at least one of which is connected to a direct current generator such as a cathodic protection device, consists in placing calibrated specimen test metal pieces in the vicinity of the buried metal structures, the test pieces being made of materials that are analogous to those of the structures. The test pieces are spaced apart from each other by a distance L' equal to the distance L between the structures. Reference electrodes are placed in the immediate proximity of the specimen metal test pieces and simultaneous measurements are performed firstly of the potentials of the specimen test pieces relative to the reference electrodes, and secondly of the currents flowing through the calibrated specimen test pieces when they are electrically connected to respective ones of the structures.

REFERENCES:
patent: 1978440 (1934-10-01), Shepard
patent: 3355665 (1967-11-01), Fegan, Jr.
patent: 4481474 (1984-11-01), Gerrit
patent: 4591792 (1986-05-01), Birchmeier et al.
patent: 4659492 (1972-03-01), Marsh et al.
patent: 4806850 (1989-02-01), Saumade et al.
Seifert, R. L., "The Calculation of True Cathodic Protection Interference Drain Current from Easily Measured Data", Materials Performance, vol. 20, No. 2, pp. 19-24, Houston, 1981.
Polak, J., "The Use of Multipurpose Measuring Probes to Assess the Adequacy of Cathodic Protection of Buried Pipelines", Materials Performance, vol. 22, No. 8, pp. 12-20; Houston, 1983.

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