Pipeline pig having gauging plate

Details Pipeline pig having gauging plate Pipeline pig having gauging plate

1977-04-06

1980-10-14

Little, Willis

Geometrical instruments

Area integrators

Electrical

33178F, 33DIG13, G01B 712, G01B 728

Patent

active

042273099

ABSTRACT:
A pipeline pig is equipped with a gauging plate which consists of a flexible disc having strain gauges secured thereto so as to be subject to deformation when the disc makes contact with an obstruction or deformation in the pipe wall. The strain gauges are connected in a bridge circuit which goes out of balance when the disc is deformed. The output of the bridge circuit is connected to means for producing an output signal when the disc is bent rapidly but not when it is bent slowly so as not to respond to slow deformation due to build-up of debris in front of the pig.

REFERENCES:
patent: 2656613 (1953-10-01), Goble
patent: 2771685 (1956-11-01), Kinley
patent: 3706047 (1972-12-01), Gunzel
patent: 3830100 (1974-08-01), Kamer

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