Vibration Root Cause Analysis

Do you see noticeable vibrations in your piping system? Are you worried that this could lead to fatigue failure? If the answer to both of these is yes then you should think about carrying out a ‘root case analysis.’ The DRG approach to such a situation has three steps: (1) understand the cause, (2) determine if fatigue is a risk and (3) suitable remedial action.

 

The first stage in solving the problem is to understand the mechanism by which the vibrations are occurring. Typically a site-visit, often with vibration measurements, coupled with computation simulations forms the starting point. Here the likely excitation mechanism can be identified, for example is it acoustical induced vibration (AIV), vortex shedding from a cross branch, slugging, a standing wave developing inside a chamber or mechanically induced by connected equipment?

 

Once the mechanism is understood, DRG will determine how much of the design fatigue life has been used and whether action needs to be taken to ensure a safe system. When remedial action is necessary, we pride ourselves on working closely with the operator to ensure that practical and economic recommendations are made.