Presentation
Rotating and
reciprocating
equipment
Skid design
Internal faults
Reciprocating equipment faults
Piping Vibration
Structural
vibration

Plant vibration control is a key part of the process of ensuring ongoing production reliability and integrity.

Our expert teams are committed to being reactive to our clients’ requests regarding on-site diagnosis and troubleshooting.

Such interventions comprise, but are not limited to:

  • Rotating and reciprocating equipment,
  • Piping, and
  • Structures.

Presentation

piping vibration diagnosis
reactivity diagnosis mobilization

Rotating and reciprocating equipment packages are the main sources of vibration on Oil & Gas facilities.
However, several faults could lead to vibration level increases. The most significant examples are:

  • Poor rotating equipment skid design,
  • Internal defaults (bearings, etc.), and
  • Reciprocating equipment defaults.

Rotating and reciprocating equipment

compressor vibration diagnosis
rotating machine skid
offshore pump noise

Excessive vibration levels are often due to a resonance phenomenon corresponding to the coincidence between:

  • The equipment excitation frequency (usually rotation speed and first harmonics),
  • The skid natural frequency corresponding to the first skid flexion or torsion modes or main component rocking modes (driver & driven machines, gearbox).

Poor rotating equipment skid design

equipment structure assembly
pump baseplate mode
skid dynamic stiffness

The damage that can occur on some critical components (bearings, gears) or to shaft faults (torsion and flexion modes, unbalance, misalignment) can be an important source of vibration. These faults can be identified by their signature and can usually be anticipated with careful design and maintenance.

Internal faults

oilpan default analysis
machine gearbox diagnosis
time shock signal
ball bearing verification

Diesel engines, reciprocating pumps and compressors are naturally strong vibration sources because of their operational behavior. They generate high levels of excitation over a broad range of frequencies.

The most common faults specific to these equipment packages are:

  • Inefficient Anti-Vibration Mountings;
  • Inefficient decoupling of connected pipework; and
  • Poor design of dampers, anti-pulsation bottles and restricted orifices.

Reciprocating equipment faults

alternating compressor pulsation
anti pulsating bottle vibration-measurements
equipment fixation structure

Piping vibration issues are often highly complex and require the liaison of various technical disciplines (piping, structure, process etc.). The intervention of a specialized piping vibration expert with a global understanding of such issues is often required and highly recommended. With extensive project experience gained from around 30 years work in piping vibration studies, Vibratec is a leading international expert in this field.

Our experts are able to acquire and analyze vibration & dynamic pressure data. Using the results of the acquired data, root causes are determined and practical recommendations are provided.

Main techniques used include:

  • Vibration spectral analysis,
  • Pipe pressure spectral analysis,
  • Experimental Modal analysis,
  • Dynamic stress analysis, and
  • Operational Deformation Shapes.

Piping Vibration

onshore pipe_rack mitigation
piping vibration measurement
welding problem detection

The structures supporting vibrating equipment can amplify vibration levels if not correctly designed. The risk of resonance is important on metallic structures such as platforms, topsides or pipe racks as it can lead to material fatigue and failure. Resonance also needs to be taken into account on concrete baseplates.

When assessing structural vibration, Vibratec typically combines measurements with a Finite Element Model of the structure. The model is tuned with experimental results, after which it becomes possible to compute the efficiency of any proposed modifications. The main objectives are typically:

  • to modify the structure response in order to avoid a coincidence between an equipment excitation frequency and a natural frequency of the structure;
  • to greatly reduce the vibration amplitude by stiffening the structure; and
  • to improve the uncoupling of the vibrating equipment.

Structural vibration

platform structural integrity
platform vibration measurements
well pipe deformation

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