Power Plant Guruji

 Q.1  What is the difference between control oil & trip oil? Ans.             Trip Oil -  Oil passes through some of protection relays to open ESV is called Trip oil Turbine Trip Oil Circuit Control Oil  -  Oil goes to for operation of HP, IP & LP valve actuators through I to H converters is called as control oil Turbine Governing System Q.2  Why the control oil temperature is more than lube oil ? Ans.    To maintain low viscosity of the oil.   Because control & governing system internal parts have very low operating clearances.   So in order to maintain that control oil is not cooled & maintained its temperature around 60 deg     Actuators & ESV components are operating at very less clearance need low oil viscosity. Actuators & ESV components are operating at very less clearance up to 50 microns. Turbine Oil System Q.3 Mesh  size for lube oil ...

  Steam Turbine Wet Washing Washing Procedure : Turbine blades wet washing is carried out at condensate temperature around 100 deg C.  After shut down of Turbine, Turbine is allowed to cool to 100 deg C or if it is under shutdown then Turbine is heated up to 100 deg C.  Then Turbine is filled with 100 deg C condensate water through any of the Turbine casing drains or bleed lines. Later, the rotor is rotated slowly with barring gear for 3 to 5 hours & then the water will be drained.  This procedure is repeated for 3 to 4 times till you get clear water from drain. Wet steam is generally generated by injecting cold water in super heated steam.  This wet steam is allowed to enter into Turbine & keep the turbine speed around 500 to 1000 rpm depending on the Turbine speed or may be maintained around 10-20% speed.  Care should be taken for 100% removal of condensate water from wet steam.   Also there should not be variation in quality & tempe...