Lube & Control Oil Sysytem
A single oil supply line lubricates and cools the bearing, governs the m/c and operates the hydraulic actuators and safety and protective devices.
During start-up & shut-down, aux oil pump supplies the control oil. Once the turbine speed is more than 2850 rpm, the main oil pump (M.O.P) takes over. It draws oil from main tank .The lubricating oil passes through oil cooler, before can be supplied to the bearing (Under emergency, lube oil can be supplied by a DC oil pump).Before the turbine is turned or barred, Jacking oil pump (2 nos.) supplies high pressure oil to the jack up the TG shaft to prevent boundary lubrication and also supplies high pressure oil to drive the hydraulic motor(turning gear)