Westinghouse W251B11 (48.5MW natural gas fired Gas turbine) lube oil problem


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Turbine: Westinghouse W251B11 (48.5MW natural gas fired Gas turbine). We are facing serious problem as turbine is consuming lube oil at even 2litre/hr rate. This problem has started few months back.

We found traces of lube oil seepage at compressor inlet bell mouth but not on compressor blades as we are continuously watching compressor efficiency. Secondly at turbine exhaust side no deposit was seen. This W251B11 gas turbine has extra protection at Turbine inlet bearing by providing 2PSI instrument air supply for sealing purpose and in return of that sealing air 5~6'' W.C is present.

We are confusing where this oil is going? Its very dangerous