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Page | 055 GAS TURBINES
Gas control valve control servo-valve
Gas control valve LVDTs
Stop ratio valve LVDTs
Pr transducers
Gas fuel servo hydraulic filter ( in the hyd supply to the SRV & GCV)
Gas fuel Manifold & Nozzles
Protection Device
Low gas pr switch, installed in the Gas piping ahead of GCV /SRV provides the alarm
protection should the gas pr drops below the switch setting.
Fuel gas vent valve vent the any accumulated gas in the compartment between
GCV/SRV through pipings.
Three pr transducers are installed in the fuel gas discharge side of the SRV to
provide operational feedback signal to the control system.
Three Pr gauges are provided in the fuel gas piping. P1 measures the pr of the fuel gas
entering the SRV, P2 measures the pr as it leaves the valve & P3 measures the
pressure of the gas leaving the GCV and flowing to the gas manifold.
Inlet & Exhaust System
Gas turbine performance and reliability is a function of the quality and cleanliness of the
inlet air entering the turbine. It is necessary to treat the inlet air entering the turbine &
filter out the contaminants.
Inlet air system with its specially designed equipment & ducting to modify the quality of the
air under various temp, humidity and contamination situations.
Hot exhaust gases produced as a result of the combustion in the turbine are cooled and
attenuated in the exhaust system ducting before being released to the atmosphere.
Training on Gas turbine Fundamentals by Sri Ajay Tripathi CM (Mech), GAIL, Pata on 23rd June 2009.
Material Compiled by: Mechanical Maint Dept GAIL Pata For discussion
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