Advanced Inspection Technology to Assess Unpiggable Pipelines
As seen in the July 2012 edition of Australian Oil & Gas Review. To see the original article in the publication, go here and then select page 34.
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The InVista tool is a compression wave ultrasonic in-line inspection device, also known as a pig, designed to navigate unpiggable and difficult-to-inspect pipelines. Equipped with unique technology, the InVista tool can record accurate high-resolution wall thickness measurements in combination with internal radius measurements.
The pipeline that Quest Integrity was contracted to inspect supplies crude feed from an off-site tank farm to a refinery; it was constructed from electric resistance welded seamless pipe with nominal wall thicknesses varying from 0.219in to 0.500in. An as-built survey indicated that the pipeline had a 90-degree bend with a possible bend radius of 1.0D, or a mitred bend, which would prevent it from being inspected using traditional methods.
A minimum bore of 10.25in was discovered using a gauge plate, amounting to a 16 percent reduction that could not be negotiated by traditional pigging tools.