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

Hu, Xiaoyin; Jia, Jiuhong; Wang, N.; Xia, Xin; Wang, Z. D.; Tu, S.T.

doi:10.1115/1.4005943

Cited by 8 publications

(6 citation statements)

References 11 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%

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%

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

Zhang

Jia

Wang

et al. 2013

Sensors

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“…However, failures do occur, and the fracture failure of pipelines may have catastrophic consequences. In order to conduct fracture failure analysis of pipelines effectively, it is necessary to identify the fracture modes of the pipeline material that may occur during a pipeline's service [2][3][4]. Fracture modes of pipeline steel can be commonly classified into several categories, including ductile fracture, brittle fracture and fatigue fracture [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The Simulation of Extremely Low Cycle Fatigue Fracture Behavior for Pipeline Steel (X70) Based on Continuum Damage Model

Fang

Sun

et al. 2023

Metals

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Natural gas transmission pipelines installed in seismic and permafrost regions are vulnerable to cyclic loads with a large strain amplitude. Under these conditions, the pipe may fail in extremely low cycles, a situation which is also known as extremely low cycle fatigue (ELCF) failure. The fracture mechanism of ELCF shows significant difference to that of low cycle fatigue, and the ELCF life usually deviates from the Coffin–Manson law. Thus, it is essential to develop an effective model to predict ELCF failure of the pipeline. In this study, a series of ELCF tests is performed on pipeline steel (X70). A damage coupled mixed hardening model is developed to simulate the fracture behaviors. Continuum damage law under monotonic load is extended to cyclic load by introducing the effective equivalent plastic strain. By assuming the cyclic softening is induced by the damage accumulation, the damage parameters are fitted directly from the peak stress in each cycle. Then, the model is input into commercial software ABAQUS with a user material subroutine to simulate the fracture behaviors of these specimens. The simulation results show good agreements with the test results both under cyclic and monotonic load, which verifies the reliability of the model.

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

Cited by 8 publications

References 11 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

The Simulation of Extremely Low Cycle Fatigue Fracture Behavior for Pipeline Steel (X70) Based on Continuum Damage Model

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

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