Quest Integrity was examining the interior of a 48-inch diameter pipe as part of infrastructure maintenance, and required an accurate method of determining the extent of the wall erosion. The video inspections showed that pipe liner was wearing out, but did not enable them to quantify the severity of the erosion.
The client had specific questions that they needed to report on the state of the pipeline asset:
- How much material is left?
- How has the diameter changed?
- Is the liner protruding into the pipe?
- What is the risk that it will leak?
- What is the remaining service life of the asset?
For this type of application, Quest Integrity had previously used video inspection for qualitative information, but had no way of obtaining more quantitative data on pipe conditions. Using laser scanning for pipe and tunnel inspection provides objective measurements that are simply not achievable with video inspection alone.
Although 2G Robotics underwater laser scanners complement General Video Inspection (GVI) well in both open air and underwater environments, this scan was limited to a drained Circular Water line in order to accommodate other components.
The crawler entered through a manhole in the pipe, and traveled a few meters in each direction to perform the inspection scan.
Thanks to the detailed 3D models provided by 2G Robotics laser scanner data, Quest Integrity was able to determine that there had been large areas of pipe liner loss, and significant pipe erosion at a downstream elbow.
In order to assess deformations, a solid model of a nominal pipe was generated and inserted into the pointcloud. Then, each point’s normal distance to the model was calculated, assigning each point a new value in units of meters. This new model makes it easier to accurately highlight and quantify areas of interest for further analysis.
In this image, a large patch of missing liner can clearly be seen.
This image shows a larger section of pipe, about 10 feet from the manhole. Here, we can see that the pipe conditions are fairly uniform, with a few patches of liner still existing.
Individual patches can also be examined close-up, for more detailed inspections.
Qualitative information can also be obtained by manipulating the point cloud data, and viewing from different perspectives. This video shows a fly-through of the scanned pipe.
Quest Integrity was able to see details they would not be able to see using General Visual Inspection (GVI) alone. The ability to take actual measurements of any damaged areas or areas of interest will be critical for future maintenance and repair.
About Quest Integrity :
Quest Integrity is a global leader in technology-enabled, advanced inspection and engineering assessment for chemical, pipeline, power, and other industries.
Quest Integrity offers a Remote Digital Video Inspection (RDVI™) service, which enables visual inspection of plant systems without confined space entry or costly disassembly. This inspection method deploys a wide array of video borescopes, remotely operated cameras, robotic crawlers, and dynamic laser scanners to deliver clear concise visual data.
2G Robotics has worked with Quest Integrity on several past projects. In March of 2019, they approached 2G Robotics with a request to have our laser scanners integrated with pipe crawlers for a new deployment.
For more information on collecting detailed, accurate measurements for pipe inspection, contact, contact 2G Robotics today and speak with one of our laser scanning experts.