Underwater corrosion locater
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United States of America Patent
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Nov 30, 1999
Grant Date -
N/A
app pub date -
Apr 7, 1998
filing date -
Apr 7, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method for identifying, locating and marking an underwater pipeline anomaly such as excessive pipe wall corrosion. An inspection tool is pulled through the pipeline with a cable. The cable length is precisely measured when a pipeline anomaly is detected, and a transmitter generates a signal representing the pipeline anomaly location. This measurement provides an accurate positioning system for deploying a mobile receiver, and the receiver identifies the transmitter signal for facilitating precise marking of the pipeline anomaly from the pipeline exterior. Accurate cable measurements are taken by a controller which monitors the magnitude and variations in cable tension and length.
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