What is AIV and FIV in piping?
High-frequency piping vibrations are called acoustic-induced vibration (AIV), because the flow is mostly gas and the vibrations typically produce sound waves within the range of human hearing. Low-frequency vibrations are called flow-induced vibration (FIV), as the flow typically contains liquid and less sound waves.
What is FIV study?
Design Analysis and Field Troubleshooting. Flow-induced vibration, or vortex shedding, is due to high flow velocities such as in a piping dead leg of a centrifugal compressor system. This study evaluates vortex shedding and potential vibration across dead leg branches.
What is the meaning of flow induced vibration?
The dynamic response of structures immersed in or conveying fluid flow. Fluid flow is a source of energy that can induce structural and mechanical oscillations.
What causes vibration in heat exchanger?
According to the literature, the main sources of vibration in a heat exchanger are vortex shedding, acoustical resonance, tur- bulent buffeting and fluid-elastic instability.
How do you reduce flow induced vibration?
Mitigation of Flow-Induced Vibration
- Reduce fluid velocity by increasing pipe size or by changing process conditions.
- Increase system rigidity by increasing pipe wall thickness.
- Install viscous damper, shock arrestor, snubber, etc in the piping system.
- Reduce no turbulent sources like elbows, reducers, etc.
What is acoustic system?
acoustics, the science concerned with the production, control, transmission, reception, and effects of sound. Beginning with its origins in the study of mechanical vibrations and the radiation of these vibrations through mechanical waves, acoustics has had important applications in almost every area of life.
What is AIV engineering?
AIV (Assembly, Integration & Verification) Engineer in the Test Support Section, Test Centre Division, Mechanical Department, Directorate of Technology, Engineering and Quality.
What is lock-in Viv?
Lock-in/synchronization/wake-capture is an important phenomenon associated with vortex-induced vibrations (VIV) of bluff bodies. It is characterized by a high amplitude of structural vibrations. These vibrations can cause fatigue and may lead to catastrophic failure of structures.
What is lock-in phenomenon?
The phenomenon of lock-in happens when the vortex shedding frequency becomes close to a natural fundamental frequency of vibration of a structure. When this occurs, large and damaging vibrations can result.
What is Deresonating baffles in heat exchanger?
The concept of a deresonating baffle is to reduce the frequency of the standing wave inside the heat exchanger shell in order to make it out-of-sync with the shell’s natural frequency.
What is turbulent buffeting?
Turbulent buffeting is defined as the fluctuating forces acting on tubes due to extremely turbulent flow. on shell side of the gas.