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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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Demonstrating its capability as a world-leader in the development and delivery of asset integrity management services, Quest Integrity Group was recently contracted to inspect a 12-inch, 5.6km pipeline in the US.  The company’s ability to mobilize quickly and provide high-quality results was vital to the success of the project due to limits imposed by a scheduled refinery shut-down. Within one week of being contacted, Quest Integrity mobilized a crew to inspect the pipeline utilizing the company’s proprietary InVista™ in-line inspection technology.

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.

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