Measuring and testing – With fluid pressure – Leakage
Patent
1979-05-18
1981-06-16
Goldberg, Gerald
Measuring and testing
With fluid pressure
Leakage
138 97, G01M 302
Patent
active
042729840
ABSTRACT:
For sealing a pipeline at selective locations in order to perform leak tests, a pipeline packer assembly capable of internal travel within the pipeline can be moved to and stopped at selected locations and the packer inflated against the interior pipe walls to prevent further movement of the unit, and to provide a seal so that the pipeline may be subjected to internal high pressures to detect leaks. According to the invention, a control device for such unit comprises a gamma ray detector and signal processor receiving the electrical analogue signal from the gamma ray detector. An energizing signal from the signal processor actuates a stepping switch which provides "inflate" and "deflate" energization of the packer, and is kept in "off" condition while the packer is inoperative as in transit within the pipeline. A radiation source on the surface or selectively inserted into a bore hole near the pipeline provides a stimulus for the gamma ray detector which controls the operation of the stepping switch. The insertion and subsequent withdrawal of the radiation source from the vicinity of the pipe adjacent the control unit, successively causes the successive stepping of the stepping switch to "inflate", "deflate" and "off" conditions. The assembly is moved through the pipeline at low pressure, and the pipeline subjected to high pressure behind the packer when it is inflated, thereby to permit leak detection at successive locations within the pipeline.
REFERENCES:
patent: 3381714 (1968-05-01), Johnson
patent: 3495626 (1970-02-01), Nagel
Goldberg Gerald
Interprovincial Steel and Pipe Corporation, Ltd.
Roskos Joseph W.
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