Mitigations to Flow Induced Vibration (FIV) in Control Valve Piping System using Visco-Elastic Dampers & Neoprene Pads ⬇️
The control valve piping is vibrating due to high flow rate and high velocity, also this line is running at different flow rate condition. The generic calculations based on Energy Institute Guidelines indicate that the flow is Turbulent and Likelihood of Failure is more than one. This number is alarming and detailed analysis considering change in flow, pipe route, supports etc. is recommended to be performed. This Paper aims to study the 12-inch Control Valve Piping Vibrations observed at site due high flow rates and high velocity. and also attempts to find probable cause of the vibration and the solution to minimize these vibrations.
Pipe will exhibit a series of natural frequencies which depends on the distribution of mass and stiffness throughout the system, and the distribution are influenced pipe diameter, material properties, wall thickness, location of lumped masses (such as valves), pipe supports and also fluid density. Each natural frequency will have unique deflection shape associated with it, which is called mode shapes, which has the locations of zero motion (node) and maximum motion (Antinodes). The response of the pipe work to an applied excitation is dependent upon the relationship between the frequency of excitation and the system’s natural frequencies. Vibration generated in the pipe work may lead to high cycle fatigue of components (such as Small bore connections) or the failure at welds in the main line itself.