Corrosion, Defects

Key details

  • High-accuracy full pipe length dimensional analysis for critical sections

  • Medium-long range [0 - 1 km] robotic laser and camera crawler

  • Used to gather data in hard-to-reach locations to determine wall thickness (WT) loss due to corrosion or erosion

  • Using our proprietary in-house point cloud software allowing full data management

  • Conventional internal root pass weld scanning

  • All systems are set-up, calibrated and verified using calibration artefacts

Defect.jpg

Why?

While a considerable quantity of corrosion occurs on the outside of pipes when it does occur inside it can be even more critical. This is because it is not easy to identify the internal corrosion from the outside of the pipe as ultrasonic techniques, which are the best available, find it difficult to map accurately the internal corrosion.

Solution

The solution is to map the corrosion directly where it is, that is from the inside of the pipe. OMS makes sensors and delivery mechanisms that are perfectly adapted to do this.

Point cloud software.jpg

How?

The OMS Nomad system is able to enter through a small aperture and when it arrives the surveying location it expands to ensure that the survey is taken from the optimal location which is the centre of the pipe.

  • Data acquisition is via the use of a stripe laser on a rotating head, with a radial accuracy of ± 50 µm or ± 100 µm depending on the system used

  • Either single scans analyzed or multiple scans collected and stitched together using OMS’s proprietary in-house point cloud software

  • Camera images are also typically collected simultaneously for separate analysis and overlay of RGB colour onto the point cloud (if required)

  • This technique can also be for assessing welds and features within pipes such as liner wrinkling