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 ENG  Vol.7 No.10 , October 2015
Cavitation Detection in Variable Speed Pump by Analyzing the Acoustic and Vibration Spectrums
Abstract: Cavitation in pumps must be detected and prevented. The present work is an attempt to use the simultaneous measurements of vibration and sound for variable speed pump to detect cavitation. It is an attempt to declare the relationship between the vibration and sound for the same discharge of 780 L/h and NPSHA of 0.754 at variable speeds of 1476 rpm, 1644 rpm, 1932 rpm, 2190 rpm, 2466 rpm, and 2682 rpm. Results showed that: the occurrence of cavitation depends on the rotational speed, and the sound signals in both no cavitation and cavitation conditions appear in random manner. While, surveying the vibration and sound spectrums at the second, third, and fourth blade passing frequencies reveals no indications or phenomenon associated with the cavitation at variable speeds. It is recommended to survey the vibration spectra at the rotational and blade passing frequencies simultaneously as a detection unique method of cavitation.
Cite this paper: Kotb, A. and Abdulaziz, A. (2015) Cavitation Detection in Variable Speed Pump by Analyzing the Acoustic and Vibration Spectrums. Engineering, 7, 706-716. doi: 10.4236/eng.2015.710062.
References

[1]   Al-Arabi, A.A.B., Selim, S.M.A., Saidur, R., Kazi, S.N. and Duffy, G.G. (2011) Detection of Cavitation in Centrifugal Pumps. Australian Journal of Basic and Applied Sciences, 5, 1260-1267.

[2]   Cernetic, J. (2009) The Use of Noise and Vibration Signals for Detecting Cavitation in Kinetic Pumps. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 223, 1645-1655.
http://dx.doi.org/10.1243/09544062JMES1404

[3]   Birajdar, R., Patil, R. and Khanzode, K. (2009) Vibration and Noise in Centrifugal Pumps—Sources and Diagnosis Methods. 3rd International Conference on Integrity, Reliability and Failure. Porto. (Paper Ref: S1163_P0437).

[4]   Alfayez, L., Mba, D. and Dyson, G. (2005) The Application of Acoustic Emission for Detecting Incipient Cavitation and the Best Efficiency Point of a 60 KW Centrifugal Pump: Case Study. NDT&E International, 38, 354-358.
http://dx.doi.org/10.1016/j.ndteint.2004.10.002

[5]   Cernetic, J., Preselj, J. and Cudina, M. (2008) Use of Noise and Vibration Signal for Detection and Monitoring of Cavitation in Kinetic Pumps. Acoustics 08 Paris, June 29-July 4 2008, 2199-2204.

[6]   Jan, C. and Cudina. M. (2012) Cavitation Noise Phenomena in Centrifugal Pumps. 5th Congress of Alps-Adria, Acoustics Association, 12-14 September 2012, Petrcane.

[7]   Albraik, A., Althobiani, F., Gu, F. and Ball, A. (2012) Diagnosis of Centrifugal Pump Faults Using Vibration Methods. Journal of Physics: Conference Series, 364, Article ID: 012139.
http://dx.doi.org/10.1088/1742-6596/364/1/012139

[8]   Suhane, A. (2012) Experimental Study on Centrifugal Pump to Determine the Effect of Radial Clearance on Pressure Pulsations, Vibrations and Noise. International Journal of Engineering Research and Applications (IJERA), 2, 1823- 1829.

[9]   Gupta, S., Chouksey, V.K. and Srivastava, M. (2013) Online Detection of Cavitation Phenomenon in a Centrifugal Pump Using Audible Sound. ITSI Transactions on Electrical and Electronics Engineering (ITSI-TEEE), 1, 103-107.

[10]   Hamomd, O., Tian, X.G., Chen, Z., Albraik, A., Gu, F.S. and Ball, A. (2014) A New Method of Vibration Analysis for The Diganosis of Impeller in a Centrifugal Pump. The 21st International Congress on Sound and Vibration, 13-17 July 2014, Beijing.

[11]   Ramadevi, R. (2014) Classification of Vibration Signal to Detect Pump Cavitation Using Discrete Wavelet Transform. International Journal of Computer Applications (0975-8887), 93, 36-39.

[12]   Yan, Z.L., Liu, J., Chen, B., Cheng, X.B. and Yang, J. (2015) Fluid Cavitation Detection Method with Phase Demodulation of Ultrasonic Signal. Applied Acoustics, 87, 198-204.
http://dx.doi.org/10.1016/j.apacoust.2014.07.007

[13]   BPMA the Pump Industry Association. Variable Speed Driven Pumps-Best Practice Guide.
http://www.bpma.org.uk/filemanager_net/files/gpg344_variable_speed_best_practice_for_pumps.pdf

[14]   Al-Arabi, A.A.B., Selim, S.M.A., Saidur, R., Kazi, S.N. and Duffy, G.G. (2011) Detection of Cavitation in Centrifugal Pumps. Australian Journal of Basic and Applied Sciences, 5, 1260-1267.

[15]   Cernetic, J. (2009) The Use of Noise and Vibration Signals for Detecting Cavitation in Kinetic Pumps. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 223, 1645-1655.
http://dx.doi.org/10.1243/09544062JMES1404

[16]   Birajdar, R., Patil, R. and Khanzode, K. (2009) Vibration and Noise in Centrifugal Pumps—Sources and Diagnosis Methods. 3rd International Conference on Integrity, Reliability and Failure. Porto. (Paper Ref: S1163_P0437).

[17]   Alfayez, L., Mba, D. and Dyson, G. (2005) The Application of Acoustic Emission for Detecting Incipient Cavitation and the Best Efficiency Point of a 60 KW Centrifugal Pump: Case Study. NDT&E International, 38, 354-358.
http://dx.doi.org/10.1016/j.ndteint.2004.10.002

[18]   Cernetic, J., Preselj, J. and Cudina, M. (2008) Use of Noise and Vibration Signal for Detection and Monitoring of Cavitation in Kinetic Pumps. Acoustics 08 Paris, June 29-July 4 2008, 2199-2204.

[19]   Jan, C. and Cudina. M. (2012) Cavitation Noise Phenomena in Centrifugal Pumps. 5th Congress of Alps-Adria, Acoustics Association, 12-14 September 2012, Petrcane.

[20]   Albraik, A., Althobiani, F., Gu, F. and Ball, A. (2012) Diagnosis of Centrifugal Pump Faults Using Vibration Methods. Journal of Physics: Conference Series, 364, Article ID: 012139.
http://dx.doi.org/10.1088/1742-6596/364/1/012139

[21]   Suhane, A. (2012) Experimental Study on Centrifugal Pump to Determine the Effect of Radial Clearance on Pressure Pulsations, Vibrations and Noise. International Journal of Engineering Research and Applications (IJERA), 2, 1823- 1829.

[22]   Gupta, S., Chouksey, V.K. and Srivastava, M. (2013) Online Detection of Cavitation Phenomenon in a Centrifugal Pump Using Audible Sound. ITSI Transactions on Electrical and Electronics Engineering (ITSI-TEEE), 1, 103-107.

[23]   Hamomd, O., Tian, X.G., Chen, Z., Albraik, A., Gu, F.S. and Ball, A. (2014) A New Method of Vibration Analysis for The Diganosis of Impeller in a Centrifugal Pump. The 21st International Congress on Sound and Vibration, 13-17 July 2014, Beijing.

[24]   Ramadevi, R. (2014) Classification of Vibration Signal to Detect Pump Cavitation Using Discrete Wavelet Transform. International Journal of Computer Applications (0975-8887), 93, 36-39.

[25]   Yan, Z.L., Liu, J., Chen, B., Cheng, X.B. and Yang, J. (2015) Fluid Cavitation Detection Method with Phase Demodulation of Ultrasonic Signal. Applied Acoustics, 87, 198-204.
http://dx.doi.org/10.1016/j.apacoust.2014.07.007

[26]   BPMA the Pump Industry Association. Variable Speed Driven Pumps-Best Practice Guide.
http://www.bpma.org.uk/filemanager_net/files/gpg344_variable_speed_best_practice_for_pumps.pdf

 
 
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