Author : Asis Sarkar, Dhiren Kumar Behera, Suresh Kumar ,Manoj Singha

The reliability indicators of the GTPPS were analyzed based on a five and half -year failure database. Such reliability indicators like   failure rate (l), repair rate (μ ) and mean time to repair (z ) have been estimated. The analyses showed that gas turbine unit (GT4 and GT5) has maximum failure rate ( max F ) of once in 100 h in 2005 with system availability (Y ) of 0. 0.4950 and 0.977 and minimum failure rate ( min 1.256 ) of once in 1000 h in 2005 with Y of 0.983. GT1 has maximum mean time to repair ( max z ) of 8.091 h in 2005 with Y of 0.98 and minimum mean time to repair       ( min z ) of 1.75h in 2006 with Y of 0.99. For the period under study, GT1 has min Y of 0.98 in the year 2005 and max Y of 0.99 in 2005. The minimum availability (0.299 and 0.314 ) was observed in the case of unit 7 and unit 8 in the year 2010.  Almost all the units showed consistent availability improvement in different years. Measures to improve the reliability (R(t)) indicators  of  the plant have been suggested such as training and retraining of technical personnel on the major equipment being used and just in time availability of spares.

Keywords: Gas Turbine Power Plant (GTPP); gas turbines; reliability indicators, maintainability.

Article published in International Journal of Current  Engineering  and Technology, Vol.2,No.1 (March- 2012)