22 May 2012

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Vibration problems

It is a known fact that vibrations can cause great damage to equipment, even when they occur for a short period of time. In nearly all cases, vibrations could even have been avoided during the design phase. With each design, we perform an analysis to rule out the risk of damage caused by vibrations. We also analyse vibrations caused by external sources if this may potentially form a risk.

Case study
Location Middle East: we supply a large air cooler for a Liquefied Natural Gas (LNG) plant. Shortly after the start-up, the client informs us that an internal flow deflection plate has been torn off. Fracture surface analysis shows fatigue cracking, due to vibrations, as the cause.

Our solution
In cooperation with the client, we start with damage analysis. Using advanced software, we analyse the flow. We model the air cooler and analyse the interaction with connecting piping. This demonstrates that the pipes, installed by a third party, function as an organ pipe. They are causing vibrations that equal the resonance frequency of the flow deflection plate, causing it to tear off and resulting in an immediate plant stop. As it is impossible to modify the connecting piping, we install a new and stronger flow deflection plate that has its own resonance frequency, outside the critical zone. If we had been involved in the design of the connecting piping, this problem could have been avoided.

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