scholarly journals Ultrasonic Phased Array for the Circumferential Welds Safety Inspection of Urea Reactor

2012 ◽  
Vol 43 ◽  
pp. 459-463 ◽  
Author(s):  
Dong Hu ◽  
Qiang Wang ◽  
Kun Xiao ◽  
Yehao Ma
Keyword(s):  
Phased Array ◽  
Circumferential Welds ◽  
Ultrasonic Phased Array

Validation of an Ultrasonic-Phased Array Method for Testing of Circumferential Welds at Thin-Walled Pipes

NDT World ◽  
2016 ◽  
Vol 19 (3) ◽  
pp. 30-33
Author(s):  
Бросиус ◽  
David Brosius ◽  
Шуберт ◽  
Frank Schubert ◽  
Хильманн ◽  
...  
Keyword(s):  
Wall Thickness ◽  
Power Plants ◽  
Phased Array ◽  
Practical Method ◽  
Probability Of Detection ◽  
Circumferential Welds ◽  
Ultrasonic Methods ◽  
Ultrasonic Phased Array ◽  
Thin Walled ◽  
The Moment

Introduction. For testing of circumferential welds at thin-walled pipes with wall thickness lower than 6 mm using ultrasonic methods no standardization is available at the moment. Nevertheless, there are newest technologies available such as ultrasonic-phased-array technique and semi-automated handheld-scanner for pipes, with which it is possible to achieve promising and reliable results in that area. In order to bring the technique in operation in the field of coal-fired power plants or petrochemical industry a validation is needed, which will be approved by the inspecting authorities. Method. In that article we will present a successful validation of an ultrasonic-phased- array method for testing circumferential welds at thin-walled pipes with a wall thickness lower than 6 mm. Therefore, the complete geometry area was divided into several clusters, and single elements of that matrix were validated. The procedure conforms to the guideline VGB R-516 and other established standards. Besides theoretical analysis including simulations of the sound paths and reflections, extensive practical tests were performed. For this purpose six typical types of defects were analyzed by using a large number of test samples and the probability of detection was determined using this practical method. Result. The result of this work is a report for validation for each geometry cluster of the pipes including an inspection instruction and a qualification instruction for the testing equipment and the calibration samples. Conclusion. Based on that validations the ultrasonic-phased-array method was accepted by the inspecting authorities and thereby allowed to use in the regulated area of coal-fired power plants by a NDT-service provider and was applied very successful at several thousand welds.

Real-Time 3D Imaging using an Air-Coupled Ultrasonic Phased-Array

2020 ◽  
pp. 1-1 ◽  
Author(s):  
Gianni Allevato ◽  
Jan Hinrichs ◽  
Matthias Rutsch ◽  
Jan Adler ◽  
Axel Jager ◽  
...  
Keyword(s):  
Real Time ◽  
3D Imaging ◽  
Phased Array ◽  
Ultrasonic Phased Array

Design of Two-Dimensional Ultrasonic Phased Array Transducers

2005 ◽  
Vol 127 (3) ◽  
pp. 336-344 ◽  
Author(s):  
Shyamal C. Mondal ◽  
Paul D. Wilcox ◽  
Bruce W. Drinkwater
Keyword(s):  
Phased Array ◽  
Three Dimensional ◽  
Array Element ◽  
Two Dimensional ◽  
Circular Array ◽  
Single Location ◽  
Ultrasonic Phased Array ◽  
3D Point Spread Function ◽  
3D Volume ◽  
Simulation And Evaluation

Two-dimensional (2D) phased arrays have the potential to significantly change the way in which engineering components in safety critical industries are inspected. In addition to enabling a three-dimensional (3D) volume of a component to be inspected from a single location, they could also be used in a C-scan configuration. The latter would enable any point in a component to be interrogated over a range of solid angles, allowing more accurate defect characterization and sizing. This paper describes the simulation and evaluation of grid, cross and circular 2D phased array element configurations. The aim of the cross and circle configurations is to increase the effective aperture for a given number of elements. Due to the multitude of possible array element configurations a model, based on Huygens’ principle, has been developed to allow analysis and comparison of candidate array designs. In addition to the element configuration, key issues such as element size, spacing, and frequency are discussed and quantitatively compared using the volume of the 3D point spread function (PSF) as a measurand. The results of this modeling indicate that, for a given number of elements, a circular array performs best and that the element spacing should be less than half a wavelength to avoid grating lobes. A prototype circular array has been built and initial results are presented. These show that a flat bottomed hole, half a wavelength in diameter, can be imaged. Furthermore, it is shown that the volume of the 3D reflection obtained experimentally from the end of the hole compares well with the volume of the 3D PSF predicted for the array at that point.

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