To solve the problem of pipes vibration of large-sized compressor in ammonia plant, orifice plates are installed after thorough analysis of the causes of vibration, effectively solved the problem.

Applying throttle orifice to power plants;

With applying the throttle orifice in power plant,the thermodynamic processes and the physical phenomena is detailed for the steam water flowing through the throttle orifice,and after analysing the reason,this paper described how to calculate the orifice stages number and the orifice diameter,and in the end,the concrete application cases are presented.