The requirement of dismantling head cover due to replacement of facing plate and wearing ring is analyzed one of most critical assembly control point of turbine assembly design for reference case. Three hundred and twenty seven outage hours is computed to carry out the turbine overhauling works for the reference case design. A work measurement technique is applied for reference case design, to estimate the standard performance time for each course of action during overhauling work. Sequence analysis of events is made and identified the dependency of event and activities related to the component of the assembly design. Reference case design has been considered to study the dependency of components during turbine overhauling. Effects of component design on turbine assembly during turbine overhauls, has been focus of this study.Ī performance analysis tool is developed to analyze the influencing parameters of turbine assembly design. The main objective of this work is to study the effects of assembly design of vertical Francis turbine during turbine maintenance.
It is necessary to design maintenance friendly Francis turbine for easy assembly and disassembly, to reduce the down time of machine, operating in sediment-laden river projects. Proper assembly design of turbine provides the flexibility during repair and maintenance of turbine parts, and contributes to increase the reliability of the machine operation by reducing the down time of the machine during turbine maintenance. One of the main reasons which can be attributed to machine outage may be because of inappropriate assembly design of turbine. Francis turbine operating in sediment-laden river projects, the frequency of repair and maintenance of underwater parts are comparatively high, resulting increase the outage time of the machine. Excessive turbine wear causes turbine operational problem with machine outage, drop in turbine efficiency, generation loss, and eventually the loss in revenue. Erosive wear of turbine components has been a major problem for reliable operation of the generating machine operating in run- off -river hydropower stations. The design of hydropower plants in sediment-laden rivers is one of the major engineering challenges for long run sustainability of hydropower development.
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