Acoustic-induced vibration (AIV) causes rapid piping fatigue failures in high-capacity gas systems, often within hours of operation. Equity Engineering’s certified ISO VCAT-IV analysts perform acoustic pulsation analysis to predict failures in compressor recycle systems, safety valve installations, and pressure let-down systems. We conduct AIV assessments for expansion projects and process changes, providing equipment design and retrofit recommendations that prevent loss of containment while meeting OSHA PSM compliance.
Download the Rotating Equipment, Vibration, & Dynamics Overview here.
Stop, Listen, and Solve Vibration Issues
Acoustic vibration differs from piping vibration and often goes unnoticed until it’s too late. Acoustic vibration can occur after only a few hours of operation, and the results can be catastrophic – costly equipment failure, loss of production, environmental damage, and personnel safety issues.
Acoustic-Induced Vibration (AIV)
Acoustic-induced vibration (AIV) occurs when high-capacity gas systems flow through pressure relief devices to create high acoustic energy which excites the pipe system wall and causes high-frequency (>200 Hz) vibration. AIV is often hidden until the vibration is heard, a valve is opened, or a pipe is touched.
AIV failures happen quickly, often within a few hours of operation, and are typically found in:
- Compressor recycle systems
- Steam de-superheater systems
- High-capacity safety valve pressure let-down systems
- Small-bore connections or branches
- Welds
Why Perform an AIV Assessment?
OSHA’s process safety management (PSM) standards require refineries, chemical, petrochemical, and other industrial processing facilities to follow strict guidelines to prevent the loss of containment. At Equity Engineering, we provide practical solutions to address the issue and proactively extend the equipment’s lifecycle.
When to Conduct an AIV Assessment?
Be proactive and don’t wait until it’s too late. If you’re starting an expansion project, changing pipe lengths, or re-purposing, take time to stop, listen, and solve. The current equipment is designed for the current flow rate and pressure; any changes could lead to piping fatigue failures caused by AIV.
Equity’s AIV Workflow
We use a rigorous methodology to predict AIV failures, provide remedial actions, and reduce the potential for fatigue failures. We help mitigate the impact of AIV and reduce costs associated with increased piping schedules.
As part of our workflow, we will:
- Identify processes requiring analysis
- Conduct pulsation analysis
- Provide equipment design or retrofit recommendations to reduce dynamic stress levels
