AVT Retrofit - Introduction
Following the failure of a Dynamic Vibration Absorber (DVA) on the K3 compressor suction line AVT have designed a suitable replacement DVA that avoids welding on the tuning bar where previous failures have occurred.
The AVT DVA comprises a pair of tuned masses attached to the pipework using a split-clamp arrangement and has the following advantages:
- Can be scaled to a range of pipe sizes, forces and frequencies
- Highly effective cancellation of target frequencies
- No-weld design avoids fatigue problems
The AVT DVA installation resulted in significant reduction in vibration levels and this was confirmed by before and after vibration measurements as shown below.
*Concern Factor (CF) is defined as the closeness of the worst case peak in the vibration spectra to the EI Concern line which is independent of frequency. A CF of 1 is on the EI Concern line and CF of 5 is on the Problem line.