Project Information

Site Location: Sharjah

Equipment Name: FGT BLOWER-01

Prepared By: S. V. V. Krishna, Lead Engineer, Level -3 Vibration Analyst

Service Type: Vibration Analysis & Corrective Maintenance

Objective:-

The objective of this job is to reduce excessive vibration levels in the blower by cleaning deposition and to bring vibration within acceptable limits as per ISO 20816 standards.

Instruments Used:-

• DigivibeMX® - Vibration collector and analyzer with Wireless Technology

• Triaxial wireless sensor
  

Fig: Schematic layout for vibration‑measuring points on a motor–fan assembly

Vibration Measurement Results Before and After cleaning deposition (Velocity in mm/sec) 

During the initial inspection, high vibration levels were observed at the motor non-drive end (NDE) particularly in the horizontal direction.

COMPARISON BETWEEN BEFORE CLEANING AND AFTER CLEANING VIBRATION AMPLITUDE LEVELS

Vibration Status as of 10 March 2026: (Before cleaning deposition):

FFT SPECTRUM INTERPRETATIONS:

• Vibration data was collected at 2850 RPM; the overall vibration levels measured on the motor bearings are within the acceptable limits.
• The overall vibration values vary with the RPM of the VFD drive motor, causing in changes in the vibration values on the motor bearings
• Velocity signature indicating dominant 1X motor rotational speed at motor bearings, which indicates unbalance symptoms in fan impeller, which is above acceptable limits.
• Fluctuations in vibration levels were observed in the motor’s NDE bearing in the horizonal direction during data collection.

SUGGESTED ACTION PLANS:

• As a preliminary action clean the impeller and also motor cooling fan for dust accumulation which generating unbalance forces.
• Health status to be reassessed after above maintenance action has been carried out.
  

FFT Spectrums as of 10 March 2026 (Before cleaning deposition):

M NDE HORIZONTAL FFT SPECTRUM :

M DE AXIAL FFT SPECTRUM :

Vibration Status as of 04 April 2026 (After cleaning deposition):

FFT SPECTRUM INTERPRETATIONS:

• Vibration data was collected at 2466 RPM; the overall vibration levels measured on the motor bearings are within the acceptable limits.
• Following the cleaning of the impeller deposition, a significant improvement in vibration performance was observed. The vibration level at the motor NDE bearing decreased from 5.06 mm/sec to 1.38 mm/sec, indicating that the accumulated material on the impeller was a major contributor to the elevated vibration.
• The overall vibration values vary with the RPM of the VFD drive motor, causing in changes in the vibration values on the motor bearings
• FFT spectrum shows a dominant peak of 41.1 Hz ( i.e. 1X RPM ) and its harmonics at motor bearings, which are within acceptable limits and needs to be monitored at regular intervals.

SUGGESTED ACTION PLANS:

• FGT BLOWER-1 was found to be operating in good condition After deposition cleaning at the time of measurement, vibration trends are recommended to be monitored on regular intervals.
  

FFT Spectrums as of 06 April 2026 (After cleaning deposition):

M NDE HORIZONTAL FFT SPECTRUM :

M DE HORIZONTAL FFT SPECTRUM :

EQUIPMENT IMAGES:

TREND GRAPH:

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