Uncertainty in ultrasonic thickness measurements based on the spacing between the first and second bottom-reflected signals. II. Rough bottom surface. Irregularities with rectangular profiles

2000 ◽  
Vol 36 (9) ◽  
pp. 685-689 ◽  
Author(s):  
S. Ya. Gmyrin
Keyword(s):  
Bottom Surface ◽  
Surface Irregularities ◽  
Thickness Measurements ◽  
Ultrasonic Thickness

Repair of an Externally Corroded Pressure Vessel Using Internal Lap Patches and Weld Buildup

2009 ◽  
Author(s):  
Reza Looyeh ◽  
Jaan Taagepera ◽  
David Bosi ◽  
Martin Carroll
Keyword(s):  
Pressure Vessel ◽  
Weather Conditions ◽  
Adverse Weather Conditions ◽  
Technical Requirements ◽  
Adverse Weather ◽  
Element Technique ◽  
High Elevations ◽  
Thickness Measurements ◽  
Corrosion Under Insulation ◽  
Ultrasonic Thickness

This paper presents a newly applied hybrid method for the repair of a tall pressure vessel which has been badly corroded in several areas with a couple of pin-holed leaks caused by corrosion under insulation (CUI). Due to the defective areas being on high elevations, and therefore lacking immediate accessibility, and due to adverse weather conditions, detailed inspection and planned external repair could not have been achieved to meet safety and technical requirements. As an alternative, the vessel was fully inspected internally by ultrasonic thickness measurements (UT) method to identify the extent of external CUI and shell thinning. Then it was repaired by applying combined weld buildup and lap patches to the inside surface in order to achieve an acceptable thickness to ensure the vessel would return to operation safely and will be fit for continued service. The required level of repair and the acceptability of the methodology have been assessed and verified by detailed calculations and the use of finite element technique.

Mapping of ultrasonic thickness measurements using laser grid projection and image processing

2019 ◽  
Vol 61 (11) ◽  
pp. 643-649 ◽  
Author(s):  
T Tesfaye ◽  
M S Mohammed ◽  
K Ki-Seong
Keyword(s):  
Image Processing ◽  
Three Dimensional ◽  
Pattern Generator ◽  
Mapping Method ◽  
Oxide Semiconductor ◽  
Metal Loss ◽  
Thickness Gauge ◽  
Image Processing Algorithm ◽  
Thickness Measurements ◽  
Ultrasonic Thickness

A three-dimensional surface mapping method for ultrasonic thickness measurements is proposed to enable the dimensions and positions of measured values obtained by the conventional ultrasonic thickness gauges and flaw detectors on curved surfaces to be determined. The proposed system consists of a laser pattern generator and image processing methods. The laser grid produced by the pattern generator is projected onto the surface of the item to be inspected, mathematical relationships are developed to localise the grid nodes on the inspection surface and images are then captured using a complementary metal-oxide semiconductor (CMOS) camera. An image processing algorithm is developed to plot the scanned surface. The measurements performed using a thickness gauge are correlated with the plotted surface, which will enable thickness mapping. The experiments were carried out on a pipe with an artificial metal loss defect and the results showed that the developed method can accurately locate measured thickness values on a three-dimensional plotted surface.

Aerial Robots for Contact-Based Ultrasonic Thickness Measurements for Field Inspections

2021 ◽  
Vol 79 (7) ◽  
pp. 687-694
Author(s):  
Robert Dahlstrom
Keyword(s):  
Service Providers ◽  
Economic Value ◽  
Physical Contact ◽  
Robotic Systems ◽  
Inspection System ◽  
Aerial Robots ◽  
Industrial Sites ◽  
Inspection Systems ◽  
Thickness Measurements ◽  
Ultrasonic Thickness

Aerial robotic systems, also referred to as drones, enable the collection of data on a scale and scope heretofore unimaginable. Field inspections at industrial sites using an aerial robotic inspection system that makes physical contact with a structure or asset as part of a nondestructive testing (NDT) or nondestructive evaluation (NDE) routine is safer than placing humans at elevation and enables more data to be gathered in less time. These aerial robotic systems are highly extensible and agile enabling safer, faster, and better inspections. Robotic inspection systems are forecast to grow exponentially this decade and beyond, as asset owners and service providers realize their economic value creation, increased data collection, and safety contributions.

scholarly journals The influence of surface roughness on ultrasonic thickness measurements

2014 ◽  
Vol 136 (6) ◽  
pp. 3028-3039 ◽  
Author(s):  
Daniel Benstock ◽  
Frederic Cegla ◽  
Mark Stone
Keyword(s):  
Surface Roughness ◽  
Thickness Measurements ◽  
Ultrasonic Thickness

scholarly journals Development of ultrasonic thickness measurements of solidification front inside metallurgical reactors

2014 ◽  
Vol 16 (1) ◽  
pp. 111
Author(s):  
Jimmy Floquet ◽  
Martin Désilets ◽  
Philippe Micheau ◽  
Nicolas Quaegebeur
Keyword(s):  
Solidification Front ◽  
Thickness Measurements ◽  
Metallurgical Reactors ◽  
Ultrasonic Thickness

scholarly journals Experiences in the evaluation of carcass value of live pigs by ultrasonic photography

1975 ◽  
Vol 47 (6) ◽  
pp. 517-532
Author(s):  
Mikko Varo ◽  
Marjatta Perälä ◽  
Matti Ojala ◽  
Hannu Varo
Keyword(s):  
Mean Value ◽  
Area Measurement ◽  
Cross Sectional ◽  
A Value ◽  
Combined Use ◽  
Fat Thickness ◽  
The Cross ◽  
Thickness Measurements ◽  
Ultrasonic Thickness ◽  
Better Than

In the present study it was found that the mean cross-sectional lean area of three ultrasonic photographs has a closer correlation than any one of the three individual areas to the cross-sectional lean area measured from the carcass. The correlation of this mean value with the lean + bone amount of the most valuable part of the half carcass approached that of the cross-sectional area of the lean measured from the carcass. The correlation of the ultrasonic area measurements with the carcass amounts of fat and lean -f- bone and with the fat-lean ratio calculated from these was closer than that of the ultrasonic thickness measurements. The fat-lean ratio calculated from the areas was also slightly better correlated to carcass quality than was the ratio calculated from the thickness measurements. In other respects the fat thickness measurements appeared to be better than area measurement. Although the measurement of lean correlated to the carcass a value of the animal more poorly than the fat measurements, the highest correlations were nevertheless obtained by the combined use of the fat and lean measurements.

Assessment of Uncertainty in Modelled Ultrasonic Thickness Measurements

2011 ◽  
Vol 53 (4) ◽  
pp. 233-238 ◽  
Author(s):  
Damir Markučič ◽  
Biserka Runje ◽  
Josip Stepanić
Keyword(s):  
Thickness Measurements ◽  
Ultrasonic Thickness
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