VARIOUS FUNCTIONS OF OIL Lubrication and cooling of Bearing. Jacking up the shaft and to provide hydrostatic lubrication during low speed operation through J.O.P. Supply of control oil to governing and protection system, Supply of control oil to LP by pass governing. As a Sealing Agent in Hydrogen Cooled Generator

USED OIL Servo prime 46,Turbine oil 14,Mobil DTE medium For 500M.W Turbine F.R.F(Fire Resistance Fluid) as control oil.

PROPERTIES OF OIL (a) Specificc graviety at kg/Cm ² (b) Kinematic Viscocity at 37.8 °C c.s (c) Kinematic viscocity at 50 °C –28c.s (d)Neutralization No-.2 mg of KOH per gm.of oil (e) Flash point- 200°C (f) Pour point- -6 °C (g)Ash percentage By weight-.01% (h) Viscosity Index-97 (i) Dearation capacity at 50 °C –Max 06Minutes (J) Organic acidity –Max.14 mg of KOH per gm of oil (k) Inorganic acidity –Nil (l) Water sepration capacity after steam treatment-Max 300 Sec.

MAIN COMPONENNTS OF TURBINE LUBRICATION SYSTEM Main oil pump (M.O.P) Auxiliary oil pump (A.O.P) –In KWU T.G A.C. driven lub oil pump Starting oil pump (S.O.P)-In LMW T.G Emergency oil pump (E.O.P) Main oil tank (M.O.T) Oil pressure drop relay (O.P.D.R) Jacking oil pump (J.O.P) Oil Cooler Oil Filter Centrifuge and vapor Extraction system

CENTRIFUGE-(A)To clarify and purify the oil (B)To fill oil in to M.O.T centrifuge works on the continuous by pass system method on R.P.M. Generally capacity of centrifuge should not be less than 1/10 of total oil. FACTORS AFFECTING SEPRATION:- (A)Difference in specefic gravity. (B)Size and shape of particles. (C) Viscosity of oil.

CENTRIFUGE

OIL COOLER  To cool the lubricating oil  Consists of tube nest, inner & outer shell & water boxes  The cooling medium for these coolers is circulating water.  The pressure of the cooling water is kept lower than that of oil to avoid its mixing with oil in the event of tube rupture.  Oil Temperature controller for maintaining the lub oil temp at rated value by controlling the flow through the coolers.

OIL FILTERS  For Thrust Bearing  Filter changeover required after choking.

DUPLEX OIL FILTER WITH CHANGEOVER DEVICE

LOCATION: This pump is mounted in the front bearing pedestal. It is coupled with turbine rotor through a gear coupling. Oil suction from MOT Through two number of injectors connected in series. Takes over when turbine speed > 2800 rpm. Supplies oil for turbine bearing lubrication as well as for the turbine governing system..

M.O.P

LMW TG LUBRICATING SYSTEM ( BEARING, M.O.P, GOVERNOR, COUPLING)

SOP

NATIONAL POWER TRAINING INSTITUTE (EASTERN REGION) CITY CENTRE, DURGAPUR