Accurate method for measurement of pipe wall thickness using a circumferential guided wave generated and detected by a pair of noncontact transducers

2012 ◽  
Author(s):  
H. Nishino ◽  
Y. Taniguchi ◽  
K. Yoshida
Keyword(s):  
Wall Thickness ◽  
Pipe Wall ◽  
Accurate Method ◽  
Guided Wave ◽  
Pipe Wall Thickness

A Novel Method of Estimating the Aspect Ratio of Pipe Wall Thickness to Diameter Utilizing the Characteristics of a Hollow Cylindrical Guided Wave

2004 ◽  
Author(s):  
Hideo Nishino ◽  
Noriyoshi Chubachi ◽  
Hideo Cho ◽  
Mikio Takemoto
Keyword(s):  
Aspect Ratio ◽  
Wall Thickness ◽  
Pipe Wall ◽  
Ultrasonic Method ◽  
Guided Wave ◽  
Pipe Wall Thickness ◽  
Time Frequency ◽  
Ultrasonic Guided Wave ◽  
Dc Component ◽  
Bar Velocity

We have developed a method of estimating the aspect ratio of a pipe wall thickness to diameter (t/d) using a hollow cylindrical guided wave (HCGW). The HCGW is an ultrasonic guided wave in a pipe. The method is very useful for onsite and nondestructive estimation of pipe wall thickness. It is based on the change of the dispersion relation of the HCGW as a function of t/d. The group velocity of the primary wave (first arriving wave packet from an impulse source) of the HCGW ranges from the bar velocity to the sheet velocity as a function of t/d. The bar velocity is the velocity of the DC component of the guided wave propagating in a solid cylinder; the sheet velocity is that of the S0 mode Lamb wave. The first part of the paper describes the principle of the method. In the last part, a laser ultrasonic method was employed to verify the method in both time- and time-frequency domains. The experimental results for aluminum pipes with various t/d’s were in good agreement with the theory.

Development of a mathematical model of the influence of wall thickness on the strain rate when profiling pipes by drawing

2020 ◽  
pp. 49-52
Author(s):  
R.A. Okulov ◽  
N.V. Semenova
Keyword(s):  
Mathematical Model ◽  
Strain Rate ◽  
Wall Thickness ◽  
Pipe Wall ◽  
Strain Intensity ◽  
Thickness Strain ◽  
Pipe Wall Thickness

The change in the intensity of the deformation of the pipe wall during profiling by drawing was studied. The dependence of the strain intensity on the wall thickness of the workpiece is obtained to predict the processing results in the production of shaped pipes with desired properties. Keywords drawing, profile pipe, wall thickness, strain rate. [email protected]

Leak Testing

2021 ◽  
pp. 143-147
Author(s):  
Charles Becht
Keyword(s):  
Wall Thickness ◽  
Pipe Wall ◽  
Piping System ◽  
Pipe Wall Thickness ◽  
Pressure Testing ◽  
Leak Testing ◽  
Piping Systems ◽  
Design Pressure ◽  
Important Test

While the exercise of pressurizing a piping system and checking for leaks is sometimes called pressure testing, the Code refers to it as leak testing. The main purpose of the test is to demonstrate that the piping can confine fluid without leaking. When the piping is leak tested at pressures above the design pressure, the test also demonstrates that the piping is strong enough to withstand the pressure. For large bore piping where the pipe wall thickness is close to the minimum required by the Code, being strong enough to withstand the pressure is an important test. For small bore piping that typically has a significant amount of extra pipe wall thickness, being strong enough is not in question. Making sure that the piping is leak free is important for all piping systems.

Non-intrusive corrosion-erosion monitoring for subsea applications

2011 ◽  
Vol 51 (1) ◽  
pp. 543
Author(s):  
Geir Instanes ◽  
Sindre Kristiansen ◽  
Olav Brakstad
Keyword(s):  
Wall Thickness ◽  
Life Cycle Cost ◽  
Assessment Tool ◽  
Pipe Wall ◽  
Guided Wave ◽  
Operating Conditions ◽  
Metallic Surface ◽  
High Coverage ◽  
Pipe Surface ◽  
Ultrasonic Guided Wave

Detection and monitoring of corrosion and erosion are essential prognostic means in preserving material integrity and reducing the life-cycle cost of industrial infrastructure, ships, aircrafts, ground vehicles, pipelines, oil installations, etc. Even topside, the operating conditions can be extremely difficult, facing problems like pipe surface roughness, fluid loading, temperature variations, and a host of other factors that make development of a robust wall thickness assessment tool a challenging task. Deploying a monitoring system subsea makes the application even more demanding when factors such as high pressure and limited access must be taken into account. The ClampOn Corrosion-Erosion Monitor has already been successfully installed at several locations topside and is now in its final stages of the subsea development. Non-invasiveness, high repeatability and high coverage are among its advantages, making it an excellent candidate for subsea use. The technology is based on the dispersion of ultrasonic guided wave modes. By using electromagnetism these waves can be transmitted through the pipe wall without the sensor being in direct contact with the metallic surface. It is installed on the outer pipe wall to produce real-time wall thickness information, not as a spot measurement, but as a unique average path wall thickness.

Simulation of Ductile Tearing in a Dissimilar Material Weld up to Pipe Wall Break-Through

2010 ◽  
Author(s):  
Philippe Gilles ◽  
Alexandre Brosse ◽  
Moi¨se Pignol
Keyword(s):  
Crack Initiation ◽  
Crack Growth ◽  
Wall Thickness ◽  
Surface Crack ◽  
Pipe Wall ◽  
Ductile Crack ◽  
Pipe Wall Thickness ◽  
Ductile Tearing ◽  
Ductile Crack Growth ◽  
Computational Analyses

This paper presents ductile initiation calculations and growth simulations of a surface crack up to pipe wall breakthrough. For validation purpose, one of the two BIMET configurations is selected. The EC program BIMET has been carried out to analyze the ductile tearing behavior of DMWs through experiments and computational analyses. In the mock-up, the initial defect is an external circumferential defect located close to the weld-ferritic interface, with a depth of one third of the wall thickness. During the test, the crack extended up to two third of the pipe wall thickness. The aim of the study is to simulate the crack initiation and growth, to compare the results with the experimental records and to continue the ductile crack growth up to pipe wall break-through.

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