December 2005

Special Report: Plant Design and Engineering

Use of pipework dampers to reduce piping vibrations

This method has been applied successfully in operating facilities to increase dynamic reliability and plant life

Saha, S., Reliance Refinery

Reliability in process plant operations is often influenced by the dynamic behavior of the piping system. The piping witnesses various vibratory loads throughout its life cycle. Piping vibrations can be generally classified under two categories: transient and steady state. Transient vibrations mainly occur during plant startup, shutdown, process upset, relief valve discharge, or in the event of an earthquake. Steady-state vibrations occur almost throughout the continuous operation of the plant. Typical examples are flow-induced vibrations, pressure pulsations due to roto-dynamic equipment, vibrations due to slug flow, etc. References can be found in literature that discuss the various types

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