Apparatus for indicating the passage of a pig moving within an u

Details Apparatus for indicating the passage of a pig moving within an u Apparatus for indicating the passage of a pig moving within an u

1993-01-11

1995-05-23

Williams, Hezron E.

Measuring and testing

Vibration

By mechanical waves

324226, 32420722, 367118, G01S 174

Patent

active

054171121

ABSTRACT:
Two geophones located above an underground pipeline are spaced from each other and adjacent to both sides of a benchmark location. As a pig travels through the pipeline sound waves are generated. As a pig approaches a benchmark location, sound waves are received first by the geophone which is closest to the source of the sound waves, that is, the upstream geophone and then by the downstream geophone. The geophones generate electrical signals that are fed to a comparator circuit which is connected to upstream and downstream indicators, one of which is activated when a pig passes the benchmark depending on whether the sound was first received by the upstream or downstream geophone. An alternate embodiment adds a magnetometer at the benchmark location capable of sensing changes in the ambient magnetic field caused by the passage of a pig.

REFERENCES:
patent: 2092951 (1937-09-01), Blake
patent: 2201311 (1940-05-01), Halliburton
patent: 2558977 (1951-07-01), Pearson
patent: 2601248 (1952-06-01), Brenholdt
patent: 2601249 (1952-06-01), Brenholdt
patent: 2820959 (1958-01-01), Bell
patent: 3597680 (1971-08-01), Hadden
patent: 3754275 (1973-08-01), Carter et al.
patent: 3878453 (1975-04-01), Potter et al.
patent: 3975735 (1976-08-01), McCullough et al.
patent: 4206511 (1980-06-01), Ries et al.
patent: 4590799 (1986-05-01), Brown et al.
patent: 4714888 (1987-12-01), French et al.
patent: 4857851 (1989-08-01), Anderson et al.
patent: 4953144 (1990-08-01), Chin et al.
patent: 4982381 (1991-01-01), Mari
patent: 5031151 (1991-07-01), Fifield et al.
patent: 5252918 (1993-10-01), Van Berg et al.

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