Vertical pump systems are susceptible to complex dynamic issues, with reed frequency resonance being a critical factor in operational instability. Reed frequency, defined as the lateral natural frequency of the pump-motor support system, can lead to severe vibration when excited by hydraulic forces, mechanical unbalance, or system harmonics. This paper presents a detailed methodology for diagnosing and resolving vertical pump vibration problems associated with reed frequency interference. Through root causes are identified and mitigation strategies—such as structural stiffening, support modification, and operating speed adjustments—are evaluated. Case studies from field applications illustrate the impact of reed frequency on reliability and demonstrate the effectiveness of corrective actions. The findings highlight the necessity of incorporating reed frequency assessment in both the design and commissioning phases to enhance vertical pump performance, reduce downtime, and ensure mechanical integrity.

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