A recently upgraded pipeline crude oil pump station in Texas was experiencing high vibration levels on its pumps.  MSI set out to diagnose these VFD controlled units.

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  • Results/ Solution
    • Findings: Resonance was identified with vane pass response. This was due to various structural suction piping, discharge piping and bearing housing natural frequencies.
    • Impact: The findings led to the installation of a modified bearing housing to increase stiffness and therefore increase the structural natural frequency above the vane pass frequency excitation range. Piping modifications were analyzed using a Finite Element Analysis calibrated to the data collected on site to develop a solution with a greater chance of success upon implementation.

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Overall vibration vs. speed trend plot.

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Click image to animate. Bearing housing problem mode shape.

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ANSYS acoustic FEA model.

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