Blockage diagnostics for nuclear power plant pressure transmitter sensing lines

Lin, Kang; Holbert, Keith E.

doi:10.1016/j.nucengdes.2008.10.012

Cited by 13 publications

(4 citation statements)

References 6 publications

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“…General signal processing techniques are useful but indepth equipment condition monitoring requires equipmentspecific analysis algorithms. As an example, consider the authors' health diagnostics of pressure sensing lines in nuclear power plants [37,38]. For such instrument line diagnostics, the power spectral density of the pressure fluctuations (noise) is determined and compared to transfer function based models of normal and anomalous conditions such as line blockage, gas entrapment, and leakage [39].…”

Section: Diagnostic Monitoringmentioning

confidence: 99%

Nuclear Power Plant Instrumentation Fault Detection Using Fuzzy Logic

Holbert

Lin

2012

Science and Technology of Nuclear Installations

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Economic constraints are driving the electric power industry to seek improved methods for monitoring, control, and diagnostics. To increase plant availability, various techniques have been implemented in industry to assess equipment condition to prevent system inoperability. The availability of a large number of measured signals and additional component information and the increasing number of signal processing options to analyze sampled data motivate the assimilation of such diverse information into a plantwide condition monitor. The use of fuzzy logic is described herein for the purpose of performing the decision making regarding the system status and the possible need for component maintenance. Fuzzy-logic-based diagnostic monitoring is applied to data acquired from instrumentation within operating facilities.

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Section: Diagnostic Monitoringmentioning

confidence: 99%

Nuclear Power Plant Instrumentation Fault Detection Using Fuzzy Logic

Holbert

Lin

2012

Science and Technology of Nuclear Installations

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“…Reference [2] utilizes the rapid spectrum method to determine blockage in duct via single measurement of transfer function. Another investigation performed in [3] evaluates the effects of blockages on the nuclear power plant pressure transmitter sensing lines.…”

Section: Introductionmentioning

confidence: 99%

Blockage Detection in Circular Pipe Using Vibration Analysis

Lile¹,

Jaafar²,

Roslan³

et al. 2012

International Journal on Advanced Science, Engineering and Information Technology

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Pipe is an important medium used in most industrial and home applications for transferring liquid or gas from one end to the other. The efficiency of liquid flow is crucial to ensure proper and efficient delivering of medium carried. Liquid flow may be abrupt or ceased if blockage forms inside the circular pipe. This paper investigates the effect of blockage in circular pipe using vibration measurement. The main focus of this paper is to study the correlation of blockage levels to vibration signal. When fluid flow through an obstacle, the streamlines get closer which will increase the flow velocity and decrease the pressure. The vibration parameters are measured using accelerometer and the relationship between blockage levels to vibration signal are observed. It is found that vibration in pipe increases as the flow area gets smaller. This work expresses the potential of vibration analysis in assessing blockage inside a circular pipe with direct water flow.

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“…Existen varias anomalías en su funcionamiento que son fácilmente detectables en el análisis del ruido (Garcıá-Berrocal et al, 2005;Lin y Holbert, 2008); en el caso de los sensores de presión se pueden producir algunos fallos más difíciles de evidenciar: existencia de burbujas en la línea sensora o válvulas de aislamiento medio cerradas, por ejemplo. El procedimiento ordinario de vigilancia consiste en analizar el ruido para medir in situ el tiempo de respuesta (Bergdahl et al, 2003).…”

Section: Introductionunclassified

Vigilancia Paramétrica de la Bilinealidad de Transmisores de Presión por Análisis de Ruido

Montalvo¹,

Balbás²,

Blázquez

et al. 2010

Inf. tecnol.

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ResumenEl objetivo del presente trabajo es detectar la no linealidad asociada al comportamiento de un transmisor de presión capacitivo tipo Rosemount, cuando éste sufre pérdidas de aceite. La metodología propuesta consiste en suponer un comportamiento dinámico bilineal. Se simula la respuesta tanto del transmisor como de su línea sensora a una excitación de tipo ruido blanco y se trata la señal de medida aplicando modelos autorregresivos univariantes. Se plantea la simulación introduciendo el empleo de dos familias de coeficientes autorregresivos para reproducir la bilinealidad, no considerando la ecuación estocástica asociada a la excitación por ruido blanco. A partir de los resultados se ha definido un índice de vigilancia paramétrica para complementar la medida del tiempo de respuesta del sensor, ya que dicho tiempo no es la magnitud adecuada para detectar la bilinealidad. Palabras clave: transmisor, análisis de ruido, bilinealidad, vigilancia, ecuaciones estocásticas Parametric Surveillance of Pressure Transmitters Bilinearity through Noise Analysis AbstractThe aim of this work is detecting the non linearity associated to a Rosemount capacitive transmitter when it suffers oil loss syndrome. The proposed methodology to characterize the non-linearity consists of assuming bilinear dynamic behaviour. The transmitter and sensing line response to a driven white noise is simulated and the signal is treated applying univariant autoregressive models. As a new approach, the simulation is achieved introducing the use of two autoregressive coefficients families to reproduce the bilinearity, omitting the stochastic equation associated to the driven white noise. Base on the analysis of the results, a parametric surveillance index is defined to complement the measurement of the response time, as this time is not the appropriate quantity to detect the bilinearity.

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Blockage diagnostics for nuclear power plant pressure transmitter sensing lines

Cited by 13 publications

References 6 publications

Nuclear Power Plant Instrumentation Fault Detection Using Fuzzy Logic

Nuclear Power Plant Instrumentation Fault Detection Using Fuzzy Logic

Blockage Detection in Circular Pipe Using Vibration Analysis

Vigilancia Paramétrica de la Bilinealidad de Transmisores de Presión por Análisis de Ruido

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