Detection of Corrosion of Insulated Piping Using SH Angle Probe

2004 ◽  
Author(s):  
Tsutomu Kikuchi ◽  
Mitoshi Yotsutsuji ◽  
Yoshikazu Yokono ◽  
Kaoru Nitta ◽  
Yasushi Takagi
Keyword(s):  
Small Diameter ◽  
Longitudinal Direction ◽  
Guided Wave ◽  
Sh Wave ◽  
Sound Beam ◽  
Surface Corrosion ◽  
Ultrasonic Guided Wave ◽  
Internal Fluid ◽  
Potential Possibility ◽  
Wave Technique

One of the serious problems regarding insulated piping in petroleum and petrochemical plants is external surface corrosion. In general, visual inspection after removing insulation is carried out to detect corrosion. However, removing insulation is uneconomical, namely high cost, and time consuming processes are necessary such as setting up a scaffold. Ultrasonic guided wave technique has potential possibility to detect corrosion of long piping and has been recently investigated regarding its propagation characteristics. In this study, guided wave generated by horizontally polarized shear (SH) wave is applied to detect corrosion of insulated piping ranging from 1B to 3B. The reason why we select SH wave is that it has an advantage of being insensitive to internal fluid in piping. Through this study it is clear that SH guided wave is applicable to small diameter piping because sound beam of SH wave propagates along the longitudinal direction without circumferential extent. Accordingly local corrosion can be detected using SH guided wave technique.

Long Range Ultrasonic Guided Wave Technique for Inspection of Pipes

2006 ◽  
pp. 799-803
Author(s):  
Ik Keun Park ◽  
Yong Kwon Kim ◽  
Hyun Mook Kim ◽  
Won Joon Song ◽  
Yong Sang Cho
Keyword(s):  
Long Range ◽  
Guided Wave ◽  
Ultrasonic Guided Wave ◽  
Wave Technique

High precision ultrasonic guided wave technique for inspection of power transmission line

2016 ◽  
Vol 30 (1) ◽  
pp. 170-179 ◽  
Author(s):  
Jun Cheng ◽  
Jinhao Qiu ◽  
Hongli Ji ◽  
Enrong Wang ◽  
Toshiyuki Takagi ◽  
...  
Keyword(s):  
Transmission Line ◽  
High Precision ◽  
Power Transmission ◽  
Guided Wave ◽  
Power Transmission Line ◽  
Ultrasonic Guided Wave ◽  
Wave Technique

A Non-Contact Guided Wave Technique for Defect Thinning Monitoring

2006 ◽  
Vol 326-328 ◽  
pp. 681-684 ◽  
Author(s):  
Ik Keun Park ◽  
Yong Kwon Kim ◽  
Tae Hyung Kim ◽  
Yong Sang Cho
Keyword(s):  
Guided Waves ◽  
Guided Wave ◽  
Velocity Change ◽  
Accelerated Corrosion ◽  
Ultrasonic Guided Wave ◽  
Acoustic Transducer ◽  
Thin Aluminum ◽  
Wave Technique ◽  
Electro Magnetic ◽  
Flow Accelerated Corrosion

This paper capitalizes on recent advances in the area of non-contact ultrasonic guided wave techniques. The present technique provides a decent method for nondestructive testing of defect thinning simulating a hidden corrosion or FAC(Flow Accelerated Corrosion) in a thin aluminum plate. The proposed approach is based on using EMAT(Electro-magnetic Acoustic Transducer) to generate guided waves and detect the wall thinning without any coupling. Interesting features in the dispersive behavior of selected guided modes are used for the detection of plate thinning. It is shown that mode cut-off measurement allows us to monitor a defect thinning level while a group velocity change can be used to quantify the thinning depth.

Time delay comb transducers for aircraft inspection

2009 ◽  
Vol 113 (1144) ◽  
pp. 417-427 ◽  
Author(s):  
F. Yan ◽  
J. L. Rose
Keyword(s):  
Time Delay ◽  
Material Properties ◽  
Poynting Vector ◽  
Composite Plates ◽  
Guided Wave ◽  
Plate Structures ◽  
Reinforced Composite ◽  
Ultrasonic Guided Wave ◽  
Wave Technique ◽  
Skew Angles

Abstract An ultrasonic guided wave technique based on time delay comb transducers is introduced for aircraft inspection. It is demonstrated that for isotropic plate structures the time delay comb transducers with appropriate excitation are capable of performing discontinuity detections without knowing the precise isotropic material properties of the objects being inspected. Fibre-reinforced composite plates are also considered. The wave skew effects are investigated using both the slowness curve and the Poynting vector. A composite inspection technique that takes advantage of the skew effects is proposed. Using time delay comb transducers to excite the guided wave modes with different skew angles, the proposed technique is capable of scanning the composite plate in different directions without moving or rotating the transducers. By contrast with the applications in the isotropic cases, knowledge of the material properties and other necessary information that is needed to produce dispersion curves is generally required. Experimental results are provided as a validation of the proposed techniques.

Long Range Ultrasonic Guided Wave Technique for Inspection of Pipes

2006 ◽  
Vol 321-323 ◽  
pp. 799-803 ◽  
Author(s):  
Ik Keun Park ◽  
Yong Kwon Kim ◽  
Hyun Mook Kim ◽  
Won Joon Song ◽  
Yong Sang Cho
Keyword(s):  
Long Range ◽  
Cross Section ◽  
Wall Thickness ◽  
Guided Wave ◽  
Experimental Results ◽  
Thickness Reduction ◽  
Ultrasonic Guided Wave ◽  
Cross Section Area ◽  
Section Area ◽  
Wave Technique

Conventional non-destructive techniques for inspection of weld in pipelines require significant test time and high cost. In this paper, a study in the application of ultrasonic guided waves to long range inspection of the pipeline is presented. The characteristics and setup of a long range guided wave inspection system and experimental results in pipes of various diameters are introduced. The experimental results in mock-up pipes with cluster type defects show that the limit of detectable wall thickness reduction with this guided wave system is 2~3% in the pipe cross section area and the wall thickness reduction of 5% in cross section area can be detected when actual detection level is used. Therefore, the applicability of the ultrasonic guided wave technique to long range pipeline inspection for wall thickness reduction is verified.

Исследование применимости при контроле дефектов высокочастотных мод направленных волн с помощью фазированных решеток

2021 ◽  
pp. 27-34
Author(s):  
М.Дж. Ранджбар ◽  
Сина Содагар
Keyword(s):  
High Frequency ◽  
Phased Array ◽  
Surface Defects ◽  
Steel Plate ◽  
Small Diameter ◽  
Guided Wave ◽  
Scanning Method ◽  
Ultrasonic Guided Wave ◽  
Array Transducer ◽  
Ultrasonic Phased Array

An ultrasonic phased array scanning method was used for lamb wave evaluation of surface and in-depth defects in a steel plate. The ultrasonic guided wave modes resulting from a phased array transducer were modeled using finite element method. The experimental results showed that the high-frequency A0 mode gives acceptable sensitivity and resolution for small diameter through-thickness and surface defects. The sectorial scanning showed better axial resolution rather than spatial resolution.

scholarly journals Fault detection in small diameter pipes using ultrasonic guided wave technology

2015 ◽  
Author(s):  
Rahul M. Sabhnani ◽  
Victor Humphrey ◽  
Bahareh Zaghari ◽  
Mohamed Moshrefi-Torbati
Keyword(s):  
Fault Detection ◽  
Small Diameter ◽  
Guided Wave ◽  
Wave Technology ◽  
Ultrasonic Guided Wave
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