Abstract
Abstract A comparison of cathodic protection criteria has been made on a 240-foot length of bare 6-inch pipe (steel) buried in 16,100—55,900 ohm. cm. soil. Anodic areas of representative size and position were established on the pipe by coupling high purity zinc plates through measuring circuits. Some of the cathodic protection criteria observed simultaneously on the pipeline include: 1. Measurement of the closure circuit current flow between the zinc plates and the pipe. 2. The McCollum Earth Current Meter. 3. Pipe-to-reference electrode potential, (a. electrode remote, b. electrode on ground over pipe. c. electrode close to pipe.) 4. The “apparent” break in the pot.-log c.d. relation. Further tests were conducted with a buried copper-iron ball corrosion system—to eliminate edge effects. Evaluation of the test data and fundamental considerations show: 1. Short lines of corrosion current continue to flow at the anode-cathode boundary even though the net closure circuit current flow is made zero. 2. Short ...
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