Case Study · Ref. 81

Fire Water Pump Skid Vibration Assessment

Vibration & Structural FEAConfidential Details Removed

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Project Images & Evidence — Fire Water Pump Skid — Vibration Assessment

Selected engineering evidence from SLETEC projects. Client names and identifiers are withheld for confidentiality.

Fire water pump skid base frame with proposed stiffening members — **Proposed Stiffening Design**Base-frame arrangement with added stiffening members for engineering assessment.

Static FEA displacement and stress contours of a pump skid — **Static FEA Assessment**Equipment-weight load case: displacement and stress contours for the assessed model.

Modal FEA mode shapes of a fire water pump skid — **Modal FEA Assessment**Natural-frequency and mode-shape review. Mode-shape displacement is not operating vibration.

Harmonic response deformation of a pump skid under engine and pump excitation — **Harmonic Response Contour**Calculated deformation under combined engine and pump excitation at the reported frequency.

Engine mounting-face velocity response versus frequency — **Engine Velocity Response**Mounting-face X-direction velocity response across the analysed frequency range.

Pump mounting-face velocity response versus frequency — **Pump Velocity Response**Mounting-face X-direction velocity response across the analysed frequency range.

Scope

Equipment-weight, modal and harmonic studies; stiffening design

Case study · Ref. 81 · VIBRATION

Fire Water Pump Skid Vibration

Challenge: Address vibration concerns on a diesel-engine-driven fire water pump skid base frame.

Approach: Equipment-weight static, modal and harmonic FEA under combined engine and pump excitation; stiffening options modelled.

Outcome: Stiffening design proposed with site-verification recommendations for vibration acceptance.

Problem / Requirement

Vibration concerns were reported on a diesel-engine-driven fire water pump skid base frame. The base frame had to be assessed under equipment weight and under the combined excitation of the engine and the pump, and a practical way to stiffen it had to be identified.

Engineering Scope

Equipment-weight static FEA: displacement and stress contours for the assessed model

Modal FEA: natural-frequency and mode-shape review (mode-shape displacement is not operating vibration)

Harmonic response FEA under combined engine and pump excitation at the reported frequency

Mounting-face X-direction velocity response of the engine and the pump across the analysed frequency range

Stiffening options modelled on the base frame and compared

Deliverables

Harmonic analysis report with response plots Static and modal FEA results for the assessed base frame Proposed stiffening design (base-frame arrangement with added members) Recommendations for site verification of vibration acceptance

Client Value Delivered

Stiffening design proposed with site-verification recommendations for vibration acceptance

Static, modal and harmonic results in one package, so the cause and the fix are reviewed together

Clear separation of mode-shape displacement from operating vibration avoids misreading the results

Standards Referenced

Project vibration criteria OEM limits for engine and pump AISC 360 (steel members, where applicable)

Software Used

Ansys Workbench (Mechanical) Hand calculations and code-based spreadsheets for independent verification

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