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What is Critical Speed of Turbine ? What are steps to avoid it during Rolling of turbine ?

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Question added by Himadri Roy , MANAGER ELECTRICAL , STEAG ENERGY SERVICES
Date Posted: 2015/11/20
samir gamil
by samir gamil , maintenance manager , يونيفرسال لتجهيزات المطابع وتصنيع سلندر آت الطباعه

Turbine shaft material has its own natural frequency, when 

turbine rotates on such a speed that frequency of shaft 

become close to its natural frequency, machine causes noise 

& high vibrations because of resonance due to matching of 

frequency. Running of Steam "TURBINE" on this speed is 

avoided & this is called Critical speed. A turbine may have 

more then one critical speed, which may depend upon number 

of couplings.

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