A. Liquid Damper

• Very efficient in most of the cases
• Economical especialy if the damper is used as a top platform
• Do not need any maintenance
• No wear
  

Liquid damper on top of a 60 m stack used as a top platform	Set of three annular Liquid damper to stabilize 3* 30 m stack (repair work of vibrating stacks)	Liquid dampers on a flare stack with its heatshield protection (repair of vibrating flare)

B. Cable Tuned Mass Damper

• Very efficient in most of the cases
• Very little need of maintenance
• No wear in most cases
  

Cable Tuned Mass Damper on a 80 m stack	Principle of one Damping unit based on cable coil

C. Dashop Tuned Mass Damper

• Efficient and economical in most somes cases especially if critical velocity is high and number of vibration cycles is low.
• Need of maintenance especially if high number of vibrating cycles
• Wear and replacement to be considered if high number of vibrating cycles

Plan View of Dashpot Tuned Mass Damper	Dashpot units – compressed and extended

D. Viscous Tuned Mass Damper

• Very efficient in most of the cases
• Do not need any maintenance
• No wear
  

42 t moving mass at 183 m with 5 viscous damping units	450 kg moving mass with a viscous damping unit enclosed in a tank