Vibration Signature of Unbalanced Rotors of Centrifugal Pumps | ||||
| The Egyptian International Journal of Engineering Sciences and Technology | ||||
| Article 6, Volume 26, EIJEST, Vol. 26, 2018, November 2018, Page 45-58 PDF (1.32 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/eijest.2018.97265 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| A Salman* ; A Osman; K Fawzy | ||||
| Zagazig University, Zagazig, 44519, Egypt | ||||
| Abstract | ||||
| Centrifugal pumps are widely used in many industrial applications. It is necessary to detect undesired conditions during the operation of it to avoid consequential damages. Early detection is a vital factor to increase the availability and reliability. Vibration analysis is an effective and efficient tool in diagnosing rotating equipment. Vibration signature of unbalanced rotors needs to investigate different running conditions of the pump. The increase in the vibration level indicates a probable mechanical failure. Unbalance is one of probable reason of the vibration in the machines. The unbalanced rotor always produces high vibration level and excessive loads on the area of the bearing and hence reducing the machine lifetime. The investigated system monitors a four stages centrifugal pump to expect the vibration spectrum of the unbalanced rotors. The driving motor runs at 2980 RPM with rated power 55 kW. This pumping system uses seawater. Comparing the vibration data of the inspected pump (in normal and faulty conditions) with each other and vibration limits of ISO10816. The results from this study clarifies the importance of vibration analysis in detecting the unbalanced rotors. Experimental results show that primarily 1X shaft running speed with sinusoidal time waveform can characterize the unbalance in shaft. The time waveform may be pure sine wave and it may contain noise. To eliminate the noise, the user may use a suitable digital or analogue filters (i.e. software or hardware). The amplitude of vibration in all directions for faulty condition is higher than the amplitude value at 1X RPM frequency in the normal condition. The amplitude at the 1X varies proportional to the square of the rotational speed. The induced forces due to unbalance on both bearing of the rotor are always at the same direction where the vibration signal from them are in phase with eachother | ||||
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