Imperial College London

ProfessorMichaelLowe

Faculty of EngineeringDepartment of Mechanical Engineering

Head of Department of Mechanical Engineering
 
 
 
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Contact

 

+44 (0)20 7594 7000m.lowe Website

 
 
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Assistant

 

Ms Nina Hancock +44 (0)20 7594 7068

 
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Location

 

577DCity and Guilds BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Leinov:2015:10.1016/j.jsv.2015.10.018,
author = {Leinov, E and Lowe and Cawley},
doi = {10.1016/j.jsv.2015.10.018},
journal = {Journal of Sound and Vibration},
title = {Ultrasonic isolation of buried pipes},
url = {http://dx.doi.org/10.1016/j.jsv.2015.10.018},
year = {2015}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - Long-range guided wave testing (GWT) is used routinely for the monitoring and detection of corrosion defects in above ground pipelines. The GWT test range in buried, coated pipelines is greatly reduced compared to above ground configurations due to energy leakage into the embedding soil. In this paper, the effect of pipe coatings on the guided wave attenuation is investigated with the aim of increasing test ranges for buried pipelines. The attenuation of the T(0,1) and L(0,2) guided wave modes is measured using a full-scale experimental apparatus in a fusion-bonded epoxy (FBE)-coated 8 in. pipe, buried in loose and compacted sand. Tests are performed over a frequency range typically used in GWT of 10–35 kHz and compared with model predictions. It is shown that the application of a low impedance coating between the FBE layer and the sand effectively decouples the influence of the sand on the ultrasound leakage from the buried pipe. Ultrasonic isolation of a buried pipe is demonstrated by coating the pipe with a Polyethylene (PE)-foam layer that has a smaller impedance than both the pipe and sand, and has the ability to withstand the overburden load from the sand. The measured attenuation in the buried PE-foam-FBE-coated pipe is found to be substantially reduced, in the range of 0.3–1.2 dB m¹ for loose and compacted sand conditions, compared to measured attenuation of 1.7–4.7 dB m¹ in the buried FBE-coated pipe without the PE-foam. The acoustic properties of the PE-foam are measured independently using ultrasonic interferometry and incorporated into model predictions of guided wave propagation in buried coated pipe. Good agreement is found between the experimental measurements and model predictions. The attenuation exhibits periodic peaks in the frequency domain corresponding to the through-thickness resonance frequencies of the coating layer. The large reduction in guided wave attenuation for PE-coated pipes would lead to greatly increas
AU - Leinov,E
AU - Lowe
AU - Cawley
DO - 10.1016/j.jsv.2015.10.018
PY - 2015///
SN - 1095-8568
TI - Ultrasonic isolation of buried pipes
T2 - Journal of Sound and Vibration
UR - http://dx.doi.org/10.1016/j.jsv.2015.10.018
UR - http://hdl.handle.net/10044/1/27664
ER -