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guided wave testing

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Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006441
EISBN: 978-1-62708-190-0
... Abstract Guided wave testing (GWT) is a method of nondestructive evaluation for the inspection of pipelines. This article focuses mainly on explaining GWT as it is applied in routine established use, covered by standards, in the oil and gas industry and also introduces some of the other...
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Published: 01 August 2018
Fig. 1 (a) Guided wave testing concept. (b) Instrumentation in use for screening to detect corrosion damage in a pipeline. Source: Ref 1 More
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Published: 01 August 2018
Fig. 5 Example of guided wave testing results ( Ref 1 ) from inspection of a 30 m (100 ft) length of pipe. The left side of the figure shows what would be seen on the screen of the instrument, while the right side shows the pipeline being inspected and a corrosion patch that was found More
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Published: 01 August 2018
Fig. 7 Advanced applications of guided wave testing. (a) Permanently installed monitoring. (b) Buried pipelines. (c) Sleeved road crossings. (d) Subsea pipelines. Source: Ref 1 More
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Published: 01 August 2018
Fig. 6 Example corrosion detected on an oil pipeline. After detecting this corrosion site using guided wave testing on a long length of the line, the insulation was removed for follow-up detailed measurements of the corrosion dimensions. Source: Ref 1 More
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006458
EISBN: 978-1-62708-190-0
... for either ultrasonic nondestructive testing or ultrasonic nondestructive evaluation, and NDE is used interchangeably for either nondestructive evaluation or nondestructive testing). Here, EMATs are defined as that class of transducers capable of generating and/or receiving a variety of elastic-wave modes...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003658
EISBN: 978-1-62708-182-5
... Abstract Microwave and guided wave (GW) nondestructive evaluation (NDE) techniques are capable of detecting corrosion damage, cracks, and other defect types in inaccessible areas. This article describes the operation principles of the techniques and provides information on hidden corrosion...
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Published: 01 August 2018
is commonly used for generating bulk shear-vertical waves for defect detection and sizing. If L S is approximately one plate thickness, these two MCs may be used for thickness gaging. For generating guided waves, L S is typically from 5 to 50 wavelengths. An identical MC configuration may be used More
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Published: 01 August 2018
Fig. 9 Configurations for air-coupled ultrasonic testing. (a) Through-transmission. (b) Angled beam. (c) Pitch-catch. (d) Guided wave More
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006469
EISBN: 978-1-62708-190-0
... (ultrasound) is introduced into a test piece through a couplant and travels by wave motion through the test piece at the velocity of (ultra)sound, which depends on the material. When the pulse of ultrasound encounters a reflecting surface that is perpendicular to the direction of travel, ultrasonic energy...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006470
EISBN: 978-1-62708-190-0
... generation and detection are discussed in the article “Guided Wave Testing” in this Volume. Fig. 8 Example of dispersion curves, calculated for aluminum 1.0 mm thick, with symmetric and antisymmetric modes, shown in normalized units (MHz-mm). A 0 and S 0 are fundamental modes; index indicates...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003298
EISBN: 978-1-62708-176-4
... materials for split-Hopkinson pressure bar testing Bar material Elastic modulus ( E ) Wave impedance (ρ/ C 0 ), km · g/s · cm 3 Impedance relative to steel, (ρ/ C 0 ) x /(ρ/ C 0 ) steel , % GPa 10 6 ksi Steel 212 31 40.8 100 Ti-6Al-4V 115 17 22.8 56 Aluminum 90 13 13.5...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006473
EISBN: 978-1-62708-190-0
... blocks are more widely accepted as standards than are test blocks that contain natural flaws, because it is easier to make a number of them more consistently. Test blocks containing drilled holes are widely used for longitudinal-wave, straight-beam inspection, and with angled beams using shear waves...
Book Chapter

Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006474
EISBN: 978-1-62708-190-0
... levels and has been successfully used in tests for bother screening and instrument and organ visualization when guiding needles were used for performing biopsies. One application receiving attention is through-transmission ultrasound applied to breast imaging. A schematic for a holographic imaging...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006471
EISBN: 978-1-62708-190-0
... with horns for high power and for a range of specialized nondestructive testing (NDT) applications. Magnetostriction is used for lower frequencies; a common application now is guided wave generation ( Ref 6 ). In looking more widely at options for ultrasound generation that generally are considered...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006438
EISBN: 978-1-62708-190-0
.... Guided wave ultrasound using piezoelectric, EMAT, or magnetostrictive sensors. This is a growing inspection approach because of advancement of techniques for focusing, steering, temperature, and dispersion curve compensation, and other advances that are leading to increased confidence in this technology...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006461
EISBN: 978-1-62708-190-0
... ). Rayleigh waves are strictly defined on a flat half-space, but a SAW propagating on a sample with a finite thickness that is greater than several wavelengths can be approximated as a Rayleigh wave ( Ref 1 , 2 ). In addition, guided surface waves on thick but slightly curved surfaces can be treated...
Series: ASM Handbook
Volume: 17
Publisher: ASM International
Published: 01 August 2018
DOI: 10.31399/asm.hb.v17.a0006472
EISBN: 978-1-62708-190-0
... diffraction ultrasonic technique cracks TIME-OF-FLIGHT DIFFRACTION (TOFD) is an ultrasonic technique used to detect diffracted waves from crack tips and to size the cracks from the arrival times of those waves. Its primary use is rapid weld testing of circumferential and axial weld seams. Time...
Series: ASM Handbook
Volume: 8
Publisher: ASM International
Published: 01 January 2000
DOI: 10.31399/asm.hb.v08.a0003300
EISBN: 978-1-62708-176-4
... Kolsky bar with the torsional Kolsky bar. It includes information on the various application areas of torsional Kolsky bar: limitations on strain rate, low- and high-temperature testing, quasi-static and incremental strain-rate testing, and localization and shear-banding experiments. incident wave...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003638
EISBN: 978-1-62708-182-5
..., such as ultrasonic thickness measurements, work from the outside of the vessel. Emerging techniques, such as microwave and guided wave ultrasonic methods can be configured to detect corrosion under coatings or to measure the moisture content of the interior of structures. Infrared imaging is typically used to detect...