Chapter 1
Turbine Package System Overview
1-12
Temperature Control Valve
A temperature control valve (XV428) operates at a set value to divert lubricating oil through the
oil cooler (TH1) as necessary to maintain the temperature of the oil at the optimum level.
Pressure Control Valve
Pressure control valve (PCV1) maintains a constant oil pressure to the bearings during turbine
running. The excess oil is spilled back through the valve to the lubricating oil tank.
Lubricating Oil Filters
Two filters are provided:
•
The main filter(s) (XF2 and XF3), which are installed downstream of the pressure control
valve, filters the main line flow of lubricating oil from the main and auxiliary pumps.
•
The lubricating oil flow from the DC motor driven emergency pump, which is separate
from the main line flow, is filtered by an emergency filter (XF4).
Oil Cooler Circuit
An oil cooler circuit incorporating an air blast oil cooler (TH1) is used to dissipate heat from the
lubricating oil prior to its entry into the main supply line. Flow to the cooler circuit is controlled
by the temperature control valve (XV428).
Non-return valves (XV26 and XV27) are fitted in the supply and return lines to prevent the
lubricating oil draining back to the tank when the turbine is shutdown.
Oil Mist Eliminator
An oil mist eliminator (XF7) is provided in the lubricating oil tank breather system to reduce the
amount of oil mist being exhausted to atmosphere.
Lubricating Oil Tank Breather System Flame Trap (if applicable)
The breather system contains a flame trap to prevent the ignition of any oil mist, which may
cause a subsequent explosion in the lubricating oil tank.
Secondary Breather Flame Traps (if applicable)
Flame traps are fitted in the compressor turbine and power turbine secondary breather systems
to prevent the ignition of any oil mist which may cause a subsequent explosion in the breather
passages.
Instrumentation
Instrumentation is provided to monitor the lubricating oil system parameters, provide warning
and trip control functions.
Refer to the Lubricating Oil System schematic diagram located in this Manual Volume.
