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HDD Pipeline Coating Defects Detected with New Approach

Author : Internet From : globalspec Release times : 2017.11.20 Views : 1160

The coatings of pipelines installed in open trenches are relatively easily inspected using various conventional techniques from the surface. Detection of coating damage is more complicated for pipelines installed by horizontal directional drilling (HDD) since access to the surface above the pipeline is limited. The HDD installation itself tends to damage coatings as pipeline segments are pulled through a borehole and contact soil, rock and other debris.

Technology developed and patented by the Southwest Research Institute (San Antonio, TX) can determine damage to the coating along both the length and around the circumference of the HDD pipeline. The method inspects pipeline segments for coating damage immediately after HDD installation. Engineers place a magnetic field sensor array within the pipeline. As the array moves along the pipeline, inspectors analyze the output from each sensor to determine location, configuration and the extent of coating damage.

Additional field testing is needed before the technology can be licensed for commercial use.

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HDD Pipeline Coating Defects Detected with New Approach

HDD Pipeline Coating Defects Detected with New Approach

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