Test verification of an extensometer for deformation measurement of high temperature straight pipes

Jia, Jiuhong; Hu, Xiaoyin; Wang, N.; Tu, S.T.

doi:10.1016/j.measurement.2012.03.037

Cited by 13 publications

(11 citation statements)

References 10 publications

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“…According to locations selected above, the extensometers are installed. Detailed information about the installation of extensometers on stations 1 and 2 was presented in [ 8 ], as well as that of stations 3 and 4 in [ 9 ], and stations 5 and 6 in [ 10 ]. Pictures of the installation are shown in Figure 4 .…”

Section: Data Analysis Of the Long-term Monitoring Systemmentioning

confidence: 99%

“…Notably, these methods are restricted by the resolution of the tele-microscope and image processing accuracy. Thereby, an extension-based sensing device (extensometer for short) was designed and verified both in the laboratory and on-site [ 8 – 10 ]. In this paper a monitoring system with extensometers for on-site high temperature components is introduced and its main features are discussed by practical application in a thermal power plant.…”

Section: Introductionmentioning

confidence: 99%

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Development of On-Line Monitoring Systems for High Temperature Components in Power Plants

Zhang

Jia

Wang

et al. 2013

Sensors

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To accurately detect deformation and extend the component life beyond the original design limits, structural safety monitoring techniques have attracted considerable attention in the power and process industries for decades. In this paper an on-line monitoring system for high temperature pipes in a power plant is developed. The extension-based sensing devices are amounted on straight pipes, T-Joints and elbows of a main steam pipeline. During on-site monitoring for more than two years, most of the sensors worked reliably and steadily. However, the direct strain gauge could not work for long periods because of the high temperature environment. Moreover, it is found that the installation and connection of the extensometers can have a significant influence on the measurement results. The on-line monitoring system has a good alarming function which is demonstrated by detecting a steam leakage of the header.

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Section: Data Analysis Of the Long-term Monitoring Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of On-Line Monitoring Systems for High Temperature Components in Power Plants

Zhang

Jia

Wang

et al. 2013

Sensors

View full text Add to dashboard Cite

show abstract

“…High temperature components are applied comprehensively in aerospace and process industries. Many researchers have suggested that monitoring the structural health of components with permanently installed transducers is a useful way to maintain their safety [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. Permanent installation will allow measurements to be more frequent and remove errors introduced by re-installing transducers.…”

Section: Introductionmentioning

confidence: 99%

Design of Waveguide Bars for Transmitting a Pure Shear Horizontal Wave to Monitor High Temperature Components

et al. 2017

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Abstract:Guided wave technique could be a possible method for monitoring components working in high temperature above 350 • C. However, this would require the design of an appropriate waveguide bar to transmit the wave, so that its sensing part is not influenced by the high temperature. In the present study, the shape of waveguide bars is designed based on the analysis of wave source characteristics. The critical frequency-width and frequency-thickness products of waveguide bars are analyzed theoretically and numerically to transmit the zeroth shear horizontal wave SH0* in bars. The results show that waveguide bars can cut off all the other wave modes when their frequency-thickness products are smaller than the critical value fd*, and frequency-width products are not smaller than the critical value fw*. Six waveguide bars are designed and fabricated based on the design criteria, and an experiment system is set up to check their work performance. The testing results indicate that the wave signals of the SH0* mode propagate clearly in waveguide bars, and cut off all the other modes when the frequency-thickness products and frequency-width products of the bars meet the design criteria. It is also demonstrated that the dependency of the experimental group velocity of each waveguide bar on frequency is in good agreement with the numerical result. High-temperature experiments also validate the reliability of the designed waveguide bars. Therefore, the critical frequency-thickness product and frequency-width product can be the basis for the design of the waveguide bars.

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“…Although many kinds of direct sensors have been developed, their applications are limited to the temperature below 500˚C and short operation periods [5][6][7][8]. As a better alternative solution, extension-based sensing devices are designed and verified [9,10]. Test results show that the designed devices can work at elevated temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Test results show that the designed devices can work at elevated temperature. However, the accuracy and resolution of the device are not sufficient enough for measuring very small creep strain of in-service high temperature components, which is normally less than 0.8×10-5％/h [10]. Therefore, in this paper, a flexure-hinged mechanical amplifier, the characteristics of which have been studied in [11], is proposed to be integrated with a sensing device.…”

Section: Introductionmentioning

confidence: 99%

Design and Test of a New Type Amplifier-based Sensing Device for High Temperature Deformation Monitoring

Jia¹,

Duan²,

Hu³

et al. 2016

Proceedings of the 2016 6th International Conference on Advanced Design and Manufacturing Engineering (ICADME 2016)

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In order to solve the problem in monitoring high temperature strain coming from harsh working environment and extremely small deformation of components, a flexure-hinged displacement amplifier is proposed to be integrated in a sensing device in order to design a more sensitive sensor to accurately online monitor small deformation of high temperature components. The structure and the work principle of the sensing device are introduced. A prototype of the sensing device is fabricated. Then the tests to verify the reliability and amplification ability are carried out at laboratory. Results demonstrate that the designed sensing device has satisfactory working performance.

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Test verification of an extensometer for deformation measurement of high temperature straight pipes

Cited by 13 publications

References 10 publications

Development of On-Line Monitoring Systems for High Temperature Components in Power Plants

Development of On-Line Monitoring Systems for High Temperature Components in Power Plants

Design of Waveguide Bars for Transmitting a Pure Shear Horizontal Wave to Monitor High Temperature Components

Design and Test of a New Type Amplifier-based Sensing Device for High Temperature Deformation Monitoring

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