Method of marking and detecting a pipeline location

Details Method of marking and detecting a pipeline location Method of marking and detecting a pipeline location

1979-09-28

1981-02-24

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Distance or direction finding

367135, 73 405A, G01S 380

Patent

active

042531675

ABSTRACT:
A method of marking a pipeline location eliminates ambiguity in case there are leaks near the location of a marker. It employs a marker that emits two separate frequencies that are modulated by a third frequency lower than either of the other two. Detection of the marker on a pipeline pig is done by separating the two frequencies and demodulating the third. Then by determining the coincidence of all three for a predetermined number of consecutive cycles of the third frequency, the marker location will be positively identified.

REFERENCES:
patent: 3683325 (1972-08-01), Vlahos
patent: 4075601 (1978-02-01), Flournoy

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