Pig detector

Details Pig detector Pig detector

1983-06-17

1985-01-01

Swisher, S. Clement

Measuring and testing

Miscellaneous

73 3, 200 6141, 200 6142, 335205, H01H 3500, H01H 3600

Patent

active

044910185

ABSTRACT:
The present invention includes a ferrous conduit mounted over an aperture in the pipeline, launch tube, or receiver through which the pigs pass. A non-magnetic sensing rod is reciprocally mounted within the conduit with the rod extending through the aperture and into the pipeline. That end of the non-magnetic sensing rod extending into the pipeline has attached thereto a head with a lower rounded surface for engaging the pigs. A non-magnetic end cap is secured to the upper end of the conduit and a non-magnetic magnet holder with a magnet disposed therein are mounted on the upper end of the rod. A magnetically operated switch is mounted adjacent the non-magnetic cap. The conduit shields the magnetic field of the magnet from the switch until a pig is detected. Upon the engagement of the head with a pig, the magnet on the upper end of the sensing rod moves above the conduit inside the non-magnetic cap and sends a magnetic flux to the magnetically operated switch. The switch is activated and sends a signal to a remote location indicating the presence of a pig.

REFERENCES:
patent: 3012116 (1961-12-01), Boylan et al.
patent: 3465327 (1969-09-01), Schroter et al.

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