Viscoelastic Dampers

The CPA Viscoelastic Damper is a passive damping device designed to effectively reduce vibrations of the structure onto which it is installed.

Whilst it does not support static load, the viscoelastic damper has both elastic and viscous properties. As a result, the device is able to dampen and dissipate energy by converting it from kinetic energy to heat.

Viscoelastic Dampers are often used across a wide range of industries, such as the oil & gas, power generation and petrochemical industries, where vibration control is vital.

In power plants, for example, excessive deflections caused by dynamic events (such as rapid valve closure, two phase flow or even earthquakes) can potentially cause significant damage to piping systems and other components. Furthermore, even small vibration displacements can result in fatigue and damage to the piping systems and other components over the long-term operation of a plant.

However, the use of CPA viscoelastic dampers protects piping systems and other components from such issues by achieving excellent vibration control.

viscous damper


1. Operating vibration and dynamic vibration can be significantly reduced and controlled along the complete piping system at all angles.

2. The damping effects of all vibration are immediate. There is a high damping effect on excessive dynamic vibration (e.g. earthquake or rapid valve closure).

3. The damping force is proportional to the vibration speed, and the proportional coefficient is the damping coefficient, which is always measured and monitored by our in-house testing machine.

4. Simple structure, cost-saving and maintenance-free.


1. The metal housing of the damper is comprised of a top plate, an outer cylindrical shell and a bottom plate.

2. Either the top or bottom plate is connected to the rigid structure, whilst the opposite plate is connected to the vibrating structure (e.g. the piping system).

3. A piston is connected to the top plate and sits within the outer cylindrical shell. The space within the shell and around the piston is filled with a viscous damping fluid.

4. As the piston compresses into the damping fluid, a damping force is generated in order to slow down the vibration frequency. The damping force is achieved by converting kinetic energy into heat. The piston is free to move all in directions within the fluid.

5. The force of the damper is directly proportional to the vibration speed, and the proportional coefficient is called the damping coefficient. This damping coefficient is directly measured and monitored by our in-house testing machine.

6. In order to achieve adequate vibration control, a well-designed viscoelastic damper must take into consideration the vibration frequency of the pipeline, the total mass of the pipeline (including the medium inside the pipeline) and the damping coefficient value
calculated from the optimal damping ratio of 0.4. The formula is outlined below: