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Technical Briefs

Design and Test of an Extensometer for Strain Monitoring of High Temperature Pipelines

[+] Author and Article Information
X. Y. Hu

MOE Key Laboratory of Pressure Systems and Safety, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, P. R. Chinaaya277@sohu.com

J. H. Jia1

MOE Key Laboratory of Pressure Systems and Safety, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, P. R. Chinajhjia@ecust.edu.cn

N. Wang

MOE Key Laboratory of Pressure Systems and Safety, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, P. R. Chinanwang@ecust.edu.cn

X. M. Xia

 Sinopec Yangzi Petrochemical Company Ltd., Nanjing 210048, P. R. Chinazrs@ypc.com.cn

Z. D. Wang

MOE Key Laboratory of Pressure Systems and Safety, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, P. R. Chinazdwang@ecust.edu.cn

S. T. Tu1

MOE Key Laboratory of Pressure Systems and Safety, School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, P. R. Chinasttu@ecust.edu.cn

1

Corresponding authors.

J. Pressure Vessel Technol 134(4), 044501 (Jul 27, 2012) (5 pages) doi:10.1115/1.4005943 History: Received July 11, 2011; Revised October 24, 2011; Published July 26, 2012; Online July 27, 2012

In this paper, an extensometer was specifically designed for online deformation monitoring of high temperature pipes and its applicability was verified experimentally. The design procedure and the installation of the extensometer were described in detail. Experiments were carried out to prove the accuracy and the reliability of the extensometer. The laboratory test at room temperature was performed. The reliability of the extensometer at high temperature was validated by on-site monitoring of the deformation of a main steam pipe operating at 540 °C in a power plant. It was demonstrated that the designed extensometer has a high accuracy and an excellent reliability for measurement of the deformation of the high temperature pipes.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Structure of the new extensometer

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Figure 2

The geometrical relation of measuring values

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Figure 4

Illustration of the loading method

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Figure 5

Comparison of calibration sensor and extensometer

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Figure 6

On-site installation of the extensometer

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Figure 7

Deformation of the pipe in the rise period

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Figure 8

Deformation-time curve of the pipe

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