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NDT.net Issue - 2016-11 - NEWS

Non Destructive Testing of defects in oil and gas pipelines

Brunel University27, Uxbridge [United Kingdom]
NDT.net Journal
Issue: 2016-11
This research is being carried out in collaboration with TWI and is focussed on the Long Range Ultrasonic Testing of pipelines. This non-destructive technique aims to locate defects in pipelines by sending an acoustic wave down the walls of the pipe and then detecting reflections scattered by a crack or region of corrosion in the pipe walls.

LRUT is suitable for testing lengths of pipe of over 70 m in length if the pipe is uncoated and is not buried. However, it is common for pipe to be buried in materials such as soil or sand. Moreover, viscoelastic coatings may also be applied to the outside of the pipe in order to protect the walls from corrosion. Both scenarios mean that the energy in the acoustic wave sent down the pipe either attenuates as it travels through the viscoelastic coating and/or leaks out into the surrounding medium. This can significantly lower the range of LRUT. The focus of this work is on developing computational models to understand the mechanisms of attenuation and energy leakage in order to improve LRUT under these difficult conditions and increase testing range.

Example of a pipe with coating.
The wave is generated in this example using the commercial LRUT equipment Teletest.

Brunel University

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2018-08-01: Improvements to the performance of guided wave testing on coated and buried pipes
2016-09-01: Portable Automated Radio-Frequency Scanner for Non-destructive Testing of Carbon-Fibre-Reinforced Polymer Composites
2016-08-01: Wave Scattering Analysis in a ACSR Cable Using Piezoelectric Transducers
2016-08-01: Comparison study on migration methods of GPR scanning images for concrete inspection
2016-07-01: A Modelling Approach for Guided Wave Propagation in Coated and Buried Pipes
2016-06-01: Reduction of Dispersive Wave Modes in Guided Wave Testing using Split-Spectrum Processing
2016-05-01: High Temperature Shear Horizontal Electromagnetic Acoustic Transducer for GuidedWave Inspection
2016-04-01: Non-Destructive Evaluation of Aircraft Cables Using Ultrasonic Guided Wave Technique
2016-03-01: A Novel Self Calibrating Pulsed Eddy Current Probe for Defect Detection in Pipework
All 27 Articles & News of Brunel University in NDT.net

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