Execution of an experimental modal analysis which revealed potential resonance issues on a fin fan oil cooler before commissioning at a petroleum refinery.  A finite element analysis helped develop a fix before the unit was ever started.

Oil-Cooler

  • Problem Statement (Challenge)
    • What (type of machine): Petroleum Refinery Fin Fan Oil Cooler Structure
    • Where (State/ Country): Pennsylvania
    • Why (problem/reason): Identify potential problematic modes near the relevant excitations for the cooler assembly before commissioning
  • Work Performed
  • Results/ Solution
    • Findings: Group of modes were identified within 15% of the 1x and 2x fan running speed, represented a significant risk of resonance condition that could result in vibration related reliability issues.
    • Impact: Finite Element results indicated that adding cross bracing as shown resulted in separation margins greater than 15% separation. The proposed modification provides a practical level of protection relative to vibration related reliability issues due to a resonance condition.

oilcoolermode

 

 

FEA

Baseline FEA calibrated to match field data.

 

Oil-Cooler-Modifications

 Yellow struts were modifications implemented before commissioning to eliminate resonance.

 

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