AOP1 pump failure in UNIT#6,STPS on 3rd April 2014

AOP1 pump failure in UNIT#6,STPS on 3rd April 2014

           During Turbine rolling (1073 rpm) at 14:26 HRS on 3rd April 2014, Unit#6 Turbine tripped through lub oil pressure very low. It was observed that turbine lub oil pressure had falling tendency & lub oil strainer getting choked frequently as well as motor current of AOP1 (Running HRS of AOP1 : 2240) hunted from 150 A to 218 A (AOP2 taking 78 A).

It was found after inspection that the inner housing of top bearing of AOP1 (Mather & Platt make) gets lowered, impeller of the pump getting rubbed with casing volute, considerable amount of mass loss of impeller was observed & MOT oil contaminated with rubbed iron particle.

 

 

 

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