Elevated vibration levels were causing a pipeline company screw pump problems.  Field tests were conducted to diagnose the cause and propose a solution to the problem.

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  • Problem Statement (Challenge)
    • What (type of machine): Pipeline Screw Pump
    • Where (State/ Country): Louisiana
    • Why (problem/reason): Determine the root cause of excessive piping, pump vibration, previous internal pump wear, and recommend solutions.
  • Work Performed
  • Results/ Solution
    • Findings: Piping natural frequencies shift into strong resonance at times. Pump twist modes go into resonance due to lack of stiffness in baseplate, being driven by piping motion.
    • Impact: Piping structural supports were recommended to increase separation margin from excitation sources.  Grouting the baseplate was recommended to increase system damping and to shift the natural frequencies away from the running speed excitation.

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FFT plot from an accelerometer located on the discharge pipe.

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Click image to animate.

 

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