Detection of incipient cavitation and determination of the best efficiency point for centrifugal pumps using acoustic emission

Abstract

Pumps play a significant role in industrial plants and need continuous monitoring to minimize loss of production. To date, published information on the application of acoustic emission (AE) to incipient pump cavitation has been contradictory. This article re-assesses the application of AE for detecting incipient cavitation. In addition, this paper presents results from an on-going programme to ascertain the applicability of the AE technique for determining the best efficiency point (BEP) of an operating system. Three different sized pumps (60 kW, 127 kW, and 2.2 MW) formed the basis of this investigation, which included NPSH (net positive suction head) and performance tests. Results obtained demonstrate the successful use of the AE technique for detecting incipient cavitation and highlight the enormous potential of the technique in determining the BEP of a pump or system.

Keywords

acoustic emission best efficiency point cavitation condition monitoring pump performance

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References

Mba

Bannister

R. H.

Condition monitoring of low-speed rotating machinery using stress waves: Part 1 and Part 2

Proc. Instn Mech. Engrs, Part E: J. Process Mechanical Engineering, 1999, 213 (E3), 153–185.

Morhain

Mba

Bearing defect diagnosis and acoustic emission

Proc. Instn Mech. Engrs, Part J: J. Engineering Tribology, 2003, 217 (J4), 257–272.

Mba

Applicability of acoustic emissions to monitoring the mechanical integrity of bolted structures in low speed rotating machinery: Case study

NDT E Int., 2002, 35 (5), 293–300.

Mba

Cooke

Roby

Hewitt

Detection of shaft-seal rubbing in large-scale power generation turbines with acoustic emissions: Case study

Proc. Instn Mech. Engrs, Part A: J. Power and Energy, 2004, 218 (A2), 71–82.

Toutountzakis

Mba

Observation of acoustic emission activity during gear defect diagnosis

NDT E Int., 2003, 36 (7), 471–477.

Holroyd

Randall

The use of acoustic emission for machine condition monitoring

Br. J. Non-Destruct. Testing, 1992, 35 (2), 75.

Tandon

Mata

Detection of defects in gears by acoustic emission measurements

J. Acoustic Emission, 1999, 17 (1-2), 23–27.

Singh

Houser

D. R.

Vijayakar

Early detection of gear pitting, power transmission and gearing conference

ASME, 1996, 88, 673–678.

Singh

Houser

D. R.

Vijayakar

Detecting gear tooth breakage using acoustic emission: A feasibility and sensor placement study

J. Mech. Des., 1999, 121, 587–593.

10.

Yoshioka

Fujiwara

Application of acoustic emission technique to detection of rolling bearing failure

Am. Soc. Mech. Engrs, 1984, 14, 55–76.

11.

Hawman

M. W.

Galinaitis

W. S.

Acoustic emission monitoring of rolling element bearings

Proc. IEEE, Ultrason. Symp., 1988, 2, 885–889.

12.

McNulty

P. J.

Deeprose

W. M.

Scaling of non-cavitating and cavitating pump noise acoustic for pumps, 1978 (Risley, UK). Paper 3, 1–17. ISBN 10185621.

13.

McNulty

P. J.

Measurement techniques and analysis of fluid-borne noise in pumps, 1981. NEL report no. 674. National Engineering Laboratory.

14.

Derakhshan

Houghton

Rechard J.

Jones

Keith R.

Cavitation monitoring of hydroturbines with RMS acoustic emission measurements

Proc. World Meeting Acoustic Emission, 1989, March, 305–315.

15.

Neill

G. D.

Reuben

R. L.

Sandford

P. M.

Detection of incipient cavitation in pumps using acoustic emission

Proc. Instn Mech. Engrs, Part E: J. Process Mechanical Engineering, 1997, 211 (E4), 267.

16.

Neill

G. D.

Reuben

R. L.

Sandford

P. M.

Brown

E. R.

Steel

J. A.

Detection of incipient cavitation in pumps using acoustic emission. Proceedings of COMADEM 96, Sheffield University, 1996, 391–401.

17.

Hutton

P. H.

Detecting acoustic emission in presence of hydraulic noise

Non Destruct. Testing, 1969, May, 111–115.

18.

Al-Maskari

Detecting of cavitation in centrifugal pump using acoustic emission. MSc Thesis, Cranfield University, 1984.

19.

Brennen

Type of impeller cavitation

Hydrodynamics of pumps, 1994, pp. 84–88 (Oxford University Press), ISBN 0-19-856442-2.