Detection of cavitation in operation of kinetic pumps. Use of discrete frequency tone in audible spectra

Čudina, Mirko; Prezelj, Jurij

doi:10.1016/j.apacoust.2008.07.005

Cited by 60 publications

(37 citation statements)

References 11 publications

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“…The following flow rate values (Q a ) have been used: 1. 28 Figure 3, and the hydraulic performance (flow rate, pump head, pump efficiency) is lower. If we follow a point on the initial characteristic curve, it can be noted that it moves to the left and down (curves noted with C in Figure 3).…”

Section: Resultsmentioning

confidence: 98%

“…More complex methods have also been developed, using neural networks to analyze centrifugal pump vibration under different conditions [25,26], resulting in promising results in associating the vibration frequency with a certain defect and abnormal pump operation. As an alternative method, the noise measurement is correlated with the operation of the centrifugal pump, enabling the determination of conditions when cavitation occurs in a centrifugal pump by using sound analysis [8,[10][11][12][13][14][27][28][29]. Alfayeza et al [27] used an application of acoustic emission to detect incipient cavitation.…”

Section: Introductionmentioning

confidence: 99%

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Centrifugal Pump Monitoring and Determination of Pump Characteristic Curves Using Experimental and Analytical Solutions

et al. 2018

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Centrifugal pumps are widely used in the industry, especially in the oil and gas sector for fluids transport. Classically, these are designed to transfer single phase fluids (e.g., water) at high flow rates and relatively low pressures when compared with other pump types. As part of their constructive feature, centrifugal pumps rely on seals to prevent air entrapment into the rotor during its normal operation. Although this is a constructive feature, water should pass through the pump inlet even when the inlet manifold is damaged. Modern pumps are integrated in pumping units which consist of a drive (normally electric motor), a transmission (when needed), an electronic package (for monitoring and control), and the pump itself. The unit also has intake and outlet manifolds equipped with valves. Modern systems also include electronic components to measure and monitor pump working parameters such as pressure, temperature, etc. Equipment monitoring devices (vibration sensors, microphones) are installed on modern pumping units to help users evaluate the state of the machinery and detect deviations from the normal working condition. This paper addresses the influence of air-water two-phase mixture on the characteristic curve of a centrifugal pump; pump vibration in operation at various flow rates under these conditions; the possibilities of using the results of experimental investigations in the numerical simulations for design and training purposes, and the possibility of using vibration and sound analysis to detect changes in the equipment working condition. Conclusions show that vibration analysis provides accurate information about the pump's functional state and the pumping process. Moreover, the acoustic emission also enables the evaluation of the pump status, but needs further improvements to better capture and isolate the usable sounds from the environment.Processes 2018, 6, 18 2 of 15 refers to the difficulty of finding a general analytical model that explains the changes of the pump characteristic curve [3,6].The development in materials and pump construction have led to an increased life time and better reliability of the products. The pump application may limit the access of personnel for a thorough visual pump inspection, so that under these conditions, the use of non-intrusive sensors can replace humans for detecting pump failure. Sometimes, air entrapment does not necessarily lead to a major failure, hence the pump may work under two-phase flow until a replacement/solution is found. However, as the pump characteristic is changing, the control system needs to know how to adjust the pumping parameters accordingly, so that the pump runs under safe conditions. This paper shows the concept of how the pump characteristic curves transform from the normal state to the conditions of circulating a two-phase mixture. Several papers have shown and demonstrated the ability of vibrations measurement as an effective solution to identify improper machine state (such as valve opening or pump vibrations) [8][9][10][11][12...

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Section: Resultsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Centrifugal Pump Monitoring and Determination of Pump Characteristic Curves Using Experimental and Analytical Solutions

et al. 2018

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“…Placing the microphones near the centrifugal pump, it was determined that a discrete frequency tone of half the blade pass frequency was distinct from the noise associated with the pump and thus was a clear indication of the onset of cavitation and its development. In later studies, Cudina et al determined that this distinct frequency was a function of the pump's design, such as the pump's geometry and material used, (Černetič & Čudina, 2011;Cudina, 2003;Čudina & Prezelj, 2009). The problems with this analysis are (1) it would be difficult for a technician to implement the detection method without knowing intricate information about the pump, and (2) surrounding noise from the environment could cause background noise interference in the signal, thus resulting in difficulty and possible inability of finding the distinct frequency stated by Cudina.…”

Section: State Of the Art In Cavitation Detectionmentioning

confidence: 99%

A vibration cavitation sensitivity parameter based on spectral and statistical methods

McKee

Forbes

Mazhar

et al. 2015

Expert Systems with Applications

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Cavitation is one of the main problems reducing the longevity of centrifugal pumps in industry today. If the pump operation is unable to maintain operating conditions around the best efficiency point, it can be subject to conditions that may lead to vaporisation or flashing in the pipes upstream of the pump. The implosion of these vapour bubbles in the impeller or volute causes damaging effects to the pump. A new method of vibration cavitation detection is proposed in this paper, based on adaptive octave band analysis, principal component analysis and statistical metrics. Full scale industrial pump efficiency testing data was used to determine the initial cavitation parameters for the analysis. The method was then tested using vibration measured from a number of industry pumps used in the water industry. Results were compared to knowledge known about the state of the pump, and the classification of the pump according to ISO 10816.

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“…Bubbles and its corresponding sound patterns are, in general, widely studied, theoretically analyzed and applied in many scientific fields. The analysis of acoustic and vibrating signals to characterize mechanical events such as pump cavitation, cavity effects in gas-jet impingement propellers and stir spot welding process have proven to be accurate and sensitive techniques [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Recorded data can be correlated with GAC properties and more specific in the determination of its exhaustion degree.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study between Acoustic Emission Analysis and Immersion Bubble-Metric Technique, TGA and TD-GC/MS in View of the Characterization of Granular Activated Carbons Used in Rum Production

et al. 2017

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Microscopic and acoustic emission analysis and sound patterns recognition techniques were applied for the characterization of granular activated carbon (GAC). A new and improved methodology has been developed to characterize the exhaustion degree of GAC used in rum production: (1) based on the acoustic emission analysis of the sound produced by water flooded on GAC; and (2) based on the microscopic analysis of bubbles formed by immersion into glycerol. Acoustic measurements are made in a specific setup , bubble detection and analysis is performed using dedicated software developed in MATLAB ® for circular shape pattern detection based on the Hough transform. Both have been correlated with data of GAC characteristics based on thermogravimetric analysis (TGA) and Thermal Desorption-Gas Chromatography Mass Spectrometry (TD-GC/MS). Eight samples of GAC used in the rum production, obtained at different depths within the fixed-bed filter, have been evaluated. Good correlations are found between the immersion "bubble-metric" technique and the acoustic measurement data from the original signal processed by Band-Pass (BP) filtering at 1.3 kHz and weight loss amounts of adsorbed compounds on the GAC. The found relationship gives the possibility to determine the exhaustion degree of GAC applying these methods and to evaluate high-porosity materials.

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Detection of cavitation in operation of kinetic pumps. Use of discrete frequency tone in audible spectra

Cited by 60 publications

References 11 publications

Centrifugal Pump Monitoring and Determination of Pump Characteristic Curves Using Experimental and Analytical Solutions

Centrifugal Pump Monitoring and Determination of Pump Characteristic Curves Using Experimental and Analytical Solutions

A vibration cavitation sensitivity parameter based on spectral and statistical methods

Comparative Study between Acoustic Emission Analysis and Immersion Bubble-Metric Technique, TGA and TD-GC/MS in View of the Characterization of Granular Activated Carbons Used in Rum Production

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