Kumar R.,Engineering and Technology Group |
Bhave S.,Engineering and Technology Group
Vibration Institute Annual Training Conference 2013 | Year: 2013
Thrust on increased productivity, profitability and reliability of equipment has brought changes in maintenance practices being practiced as it was about a decade ago. Vibrations are major sources of the failure causing alternating stresses in the components and these get superimposed on steady state stresses in turbo machineries. These arise from steady state forces such as centrifugal force, steam/fluid bending forces/twisting forces on rotating blades. These stresses may cause fatigue failure of blades and the consequent catastrophic failures of the entire machine. Environmental factors such as high temperature, corrosive/erosive elements in fluid in the flow path etc cause accelerated failures. Vibrations are experienced in large machine tools adversely affecting the quality & quantity of production. Vibration monitoring thus becomes a very important condition monitoring tool which guides condition based maintenance program. Condition Monitoring is taken to mean the use of advanced technologies in order to determine equipment's existing condition, which is termed as the operational integrity of the equipment, and also to predict the potential/impending failures. Significance of Vibration analysis as condition monitoring technique by successfully solving various industrial problems; the aspect of asset effectiveness has been presented through case studies in this paper. Normal pitfalls in vibration measurement and casual approach to basic observations like cracks in stiffeners, looseness of pedestals has been highlighted while troubleshooting various machinery problems.