Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-04-26
1978-07-04
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 9, 324 52, G01R 3112, G01R 3108
Patent
active
040991172
ABSTRACT:
The invention disclosed comprises a method of and apparatus for inspecting a pipeline in situ. An alternating voltage is impressed between the pipeline and a ground bed. Spaced electrodes are positioned transverse the pipeline at spaced locations along the pipeline. At each location, the current flowing between the electrodes is used to indicate the condition of the coating on the pipeline. In one aspect of the invention, the current flowing between electrodes is obtained by measuring the resistance of the medium in which the pipeline is buried, such as the ground, and the voltage, and then dividing the voltage by the resistance. In another aspect of the invention, the ratio of the resistive and reactive components of the current flowing between the pipeline and the ground bed is used to indicate the quality of the pipeline coating. In yet another aspect of the invention, the third harmonic content of the voltage is measured to obtain an indication of the presence of iron oxide. The amount of third harmonic present when compared with current flow indicates the quantity of oxide.
REFERENCES:
patent: 2378440 (1945-06-01), Scott
patent: 3299351 (1967-01-01), Williams
patent: 3526831 (1970-09-01), Smith
patent: 3792350 (1974-02-01), Bossler et al.
patent: 3862491 (1975-01-01), Richardson
patent: 3866117 (1975-02-01), Erdman
patent: 3991363 (1976-11-01), Lathrop
Bierman, Jr. Maurice C.
Erath Louis W.
Gaut Dick
Strecker Gerard R.
Thompson Jennings B.
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