Acoustically Induced Vibration
Acoustically induced vibration (AIV) often occurs when high capacity gas systems flow through pressure reducing devices such as relief valves, blowdown valves, restricting orifices, pressure-reducing valves, compressor recycle valves, and choke valves. The high acoustic energy generated by these pressure-reducing valves will excite the pipe systems wall and cause high frequency (>200 Hz) vibration. This vibration can lead to fatigue failure in the pipe system, especially in nearby small-bore connections and welded discontinuities on the pipe. Fatigue failure can occur in as little as a few hours. The intensity of vibration is governed primarily by the mass flow rate, gas internal energy, flow versus sonic velocity, and pressure drop.
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