Directing against the violent vibration trouble appeared on the outlet valve during high rotation speed operation of the turbine-driven feed water pump in Huaneng Dandong Power Plant

the causes leading to said vibration have been diagnosed and analysed in detail.Analysis shows that the main causes of said vibration are as follows:increasing of the gap between movable and stationary parts in the turbine-driven feed water pump;severe wornout of the balancing disk;unstable fluid in the said pump;and connected response between pipeline and valve etc..Based on the theory of fluid-solid coupling

the problem of response in pipeline system has been analysed and discussed.During the time of repair

the core of pump has been replaced

and the said trouble being eliminated.