Electricity: measuring and testing – Determining nonelectric properties by measuring electric...
Patent
1994-06-13
1995-11-21
Wieder, Kenneth A.
Electricity: measuring and testing
Determining nonelectric properties by measuring electric...
324425, 204404, G01N 2742
Patent
active
054690480
ABSTRACT:
A cathodic protection measurement apparatus including a coupon made of similar material as a buried metal pipeline to form an artificial holiday, where the coupon is buried near and electrically connected to the pipeline to receive the same level of cathodic protection current as the pipeline. A test wire is connected to the pipeline and routed to a normally-closed contact switch located at an access point of a test station. The switch is also connected to a coupon wire, which is routed and connected to the coupon to complete the electrical connection. A reference electrode having a measuring surface contacting the soil close to the buried coupon includes an electrode wire provided to the access point. A voltmeter is connected between the switch and the reference electrode wire, and the switch is then opened to electrically isolate the coupon from the pipeline. Thus, the on potential, the instant off potential, the I/R voltage drop free potential and the polarization decay of the coupon is measured, simulating the measurements of the pipeline. An ammeter may be connected to the contacts of the switch to measure the cathodic protection current received by the coupon.
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A. W. Peabody; "Control of Pipeline Corrosion;" National Association of Corrosion Engineers, 2400 West Loop South, Houston, Tex. 77027; p. 37.
Do Diep
Meridian Oil Inc.
Wieder Kenneth A.
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