The normal drain pipe of No.2 high pressure heater of a thermal power plant had vibrated obviously during operation,which seriously affected the safe and stable operation of the generator set.After measurement,it was found that the Y-direction vibration around the No.6 rigid hanger and No.7 spring hanger exceeded the standard.The modal and stress analysis of pipe system was carried out by CAESAR Ⅱ software,it had shown that pipe was too flexible and the vibration was the resonance which caused by the good coupling between the internal excitation and the natural frequency of the pipe system When the unit operated at high load.In order to improve the natural frequency and reduce the vibration velocity and amplitude of the pipe system,the vibration control scheme adding dampers to the pipe was selected.Combined with the water hammer force of the pipeline under extreme working conditions and the site rooting point,the specifications and installation positions of dampers were determined.After the implementation of the vibration control scheme,the natural frequency of the pipe system has significantly increased,the vibration amplitude and vibration velocity of the pipe system have greatly reduced,the evaluated results of the vibration has reached an excellent level.
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