Turbine Package Operators Manual
Chapter 1
Turbine Package System Overview
1-13
Temperature Monitoring
A resistance temperature detector (TT7) mounted in the lubricating oil supply tank monitors the
tank oil temperature and provides a permissive signal for tank immersion heater(s) control. The
information is also used to inhibit a start until the tank oil temperature is above a set value.
The temperature of the lubricating oil is measured by instrumentation mounted in the manifold
block by resistance temperature detectors (TT66A and TT66B) provide high oil temperature
warning and shutdown.
Pressure Monitoring
A pressure transmitters (PT6A, PT6B and PT6C (if fitted)) are mounted in the compressor
turbine supply line to provide lubricating oil pressure low/high warning and emergency lubricating
oil pump control signals.
The pressure drop across the main lubricating oil filter assembly is monitored by a pressure
differential transmitter (PDT8) to provide a warning of deteriorating element condition.
Each main lubricating oil filter housing (XF2, XF3) and the emergency oil filter housing (XF4) is
fitted with a pop up indicator button to provide a visual indication of filter blockage.
Lubricating Oil Tank Level Monitoring
A level transmitter (LT1) is used to monitor the level of the oil in the lubricating oil tank. The
information provided is used to inhibit starts if the oil level is below a set value during the gas
turbine starting process and to annunciate a warning or shutdown if the oil level falls below a set
value during normal gas turbine operation.
The level switch is also used to inhibit the operation of the immersion heater(s) if the level of the
oil in the tank is below a pre-determined level.
Lubricating Oil System Requirements
In normal conditions, the turbine is designed to run on mineral oil to ISO/VG46 in accordance
with company Fluids Specification 65/0027, which is located in this Manual Volume. Where, due
to prevailing ambient conditions or driven machinery requirements, it is necessary to use a
heavier or lighter viscosity grade of oil, ISO/VG68 or ISO/VG32 may be used respectively.
However, the company must be consulted before the use of these alternative oils.
a
Caution: It is important to use the correct type of lubricating oil. The use of oil
with insufficient or incorrect additives will cause oil performance to deteriorate.
