Instrument chassis and body supports for pipeline survey pig
This patent describes a pipeline survey pig for determining the curvature or lateral displacement of a pipeline utilizing signals generated by an inertial reference unit mounted on the pig. The pig consists of: an elongated pig body having an interior cavity defining a space for supporting an instrument chassis; an instrument chassis adapted to be supported in the pig body and including an inertial reference unit for sensing changes in course of a pipeline representing curvature or lateral displacement of portions of the pipeline; support members for supporting the pig in a section of pipeline. The support members being spaced apart and supporting the pig body in the pipeline, the support members being adapted to permit limited lateral excursion of the pig body in the pipeline; means for selectively positioning the support members longitudinally with respect to the pig body such that the center of stiffness of the pigs is in a predetermined position relative to the center of buoyancy of the pig when the pig is disposed in a fluid in a section of pipeline.
- Assignee:
- Atlantic Richfield Co., Los Angeles, CA
- Patent Number(s):
- US 4835876
- OSTI ID:
- 5458535
- Resource Relation:
- Patent File Date: 26 Jun 1987
- Country of Publication:
- United States
- Language:
- English
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