en.Wedoany.com Reported - In industrial production processes, equipment failures often disrupt normal production schedules. As a crucial link in ensuring production safety, it is vital to pinpoint the core issue during the early stages of a fault through technical means. Recently, a factory conducted an in-depth investigation into a bearing failure of a key centrifugal pump unit, successfully demonstrating the entire process from capturing faint signals to achieving precise localization.
Inspection personnel initially noticed abnormal signs in the bearing housing area on the drive end of the unit. Although the surface temperature of the equipment had not yet reached the alarm threshold, it showed a slight upward trend and was accompanied by intermittent, dull abnormal noises. Technicians promptly used a portable vibration analyzer for preliminary screening. The data indicated that while the overall vibration velocity RMS value was within the warning limit, the "kurtosis" indicator, which is sensitive to impact signals, had significantly deviated from the baseline. This phenomenon suggested that the bearing fault was in its nascent stage, with periodic impact events occurring internally.
To further confirm the damage location, engineers employed spectrum analysis and resonance demodulation techniques. In the spectrum diagram processed via Fast Fourier Transform (FFT), technicians ruled out the possibilities of imbalance and misalignment and focused on the non-synchronous frequency components in the high-frequency band. After filtering out background noise using resonance demodulation technology, a set of spectral lines with a frequency interval of 53.1 Hz clearly appeared. By comparing this value with the geometric parameters and rotational speed of the equipment, it was found to closely match the theoretical value for the outer ring in the bearing fault characteristic frequencies, thereby pinpointing the issue to the bearing outer ring.
Based on the diagnostic recommendations, maintenance personnel immediately shut down the equipment for disassembly and inspection. The on-site disassembly results confirmed that a fatigue spalling pit indeed existed on the raceway of the bearing outer ring, which was completely consistent with the earlier inference. The successful handling of this bearing fault not only avoided losses from unplanned downtime but also demonstrated the necessity of predictive maintenance through a combination of technical methods. In the field of industrial maintenance in the People's Republic of China, paying attention to early abnormal signals and combining them with precise calculations has become an important means to safeguard production efficiency.
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