We had four thousand gallon oil reservoirs on our GE steam turbine/generator sets. Reservoir oil pumps supplied shaft driven oil pump, which if I remember correctly, supplied sixteen inch turbine and generator bearings with 30 psig oil.The Mobil DTE 797 we used was ISO 32, which is about a SAE 10w oil. [/quotWhat size were they 250-300MW ?
Ours are 700s (GE licencees), 21" bearing 9, and about 78,000l of oil (again ISO 32 Caltex Regal R&O).
THe oiling system is amazing, the shaft driven oil pump at shaft centreline, 8-10m above the oil tank, and provides the high pressure control oil for the governor and valving.
Oil from the shaft pump returns to the tank and drives an oil driven turbine, which primes the main pump, and provides bearing oil through both direct pressure, and high pressure oil bypassed around the turbine.
Adjusting the baffler, and booster baffler valves at midnight really messes with your head.