Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-05-24
1977-12-06
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
204148, 204197, 324 52, 324 54, 324 71R, G01N 2700, G01R 3112, G01R 3102
Patent
active
040619656
ABSTRACT:
A cathodic protection system for a buried, fluid pipeline that has an electrical lead or coil electrically coupled between the pipeline and a sacrificial anode. As the anode deteriorates by electrochemical reaction with its environment, a current flows through the lead or coil, producing an electromagnetic field that permeates the pipeline. The strength of this magnetic field can be correlated to the condition of the sacrificial anode and/or the condition of a protective coating on the pipeline. An apparatus for detecting the strength of the electromagnetic field travels through the pipeline in a scraper or similar device, senses the magnitude of the field, and generates a signal indicative of the condition of the cathodic protection system.
REFERENCES:
patent: 2803797 (1957-08-01), Cowles
patent: 2893939 (1959-07-01), Reid
patent: 2940302 (1960-06-01), Scherbatskoy
patent: 3055970 (1962-09-01), Handley
patent: 3064127 (1962-11-01), Green et al.
patent: 3284789 (1966-11-01), Fisher
patent: 3754275 (1973-08-01), Carter et al.
patent: 3853730 (1974-12-01), Anderson
patent: 3878453 (1975-04-01), Potter et al.
Mobil Oil Corporation
Strecker Gerard R.
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