Introduction: The inlet air to compressor may contain

dirt, dust, hydrocarbon fumes etc,. A large portion of these things can be

removed by inlet air filtration. The dry contaminates that pass

through filters as well as Wet contaminants such as hydrocarbons cannot be removed effectively so compressor must be washed with water-detergent solution

online washing. off line washing. Compressor washing frequency The frequency of compressor

washing depends up on the severity and type of atmospheric contamination

The recommended method for establishing the frequency is to monitor gas turbine performance

• Restoration of lost performance• Reduced turbine operating costs• Reduction of gas turbine fuel

consumption

1 .WATER WASH SKID2. DETERGENT TANK3.ELECTRIC HEATER4.CENTRIFUGAL PUMP (88 TW)5 .VENTURI6.TEMPERATURE SENSOR7.LEVEL GUAGE

The water tank is full The detergent tank is full The water temperature is at the required level The valve on the main wash pump suction side

open The isolation value in the water supply line to

the skid is closed. The differential temp b/w the water wash and

the interstage wheelspace temp must not be greater than 48’c

To reduce the difference the water wash may be heated and the turbine kept on crank until wheel space temp drop to acceptable level

Water temp set point switch to hotOperation selector switch to manualWater heated up to proper washing

tempClose flame detector values ,fuel

mainfold drains are to be closedSelect off line water wash on in

water wash control displayMake sure turbine is shut down

01. Raise wash water temp to the required level

02. Ensure difference between the wheel space and wash water temp. <48 ºC

03. Close bearing seal air valves and open seal air drain valves.

04. Start GT on crank mode. 05. Do wetting of compressor for 5

minutes with wash pump.

06. Do compressor detergent washing for 10 mts. by running detergent pump and wash pump.

07. Do rinsing of compressor with plain water for 10 mts.

08. Isolate washing skid09. Stop GT and soak for 20 mts.10. Do compressor-drying operating

at crank speed for 20 mts.

11. Open bearing seal air valves close drain valves.

12. Divert false start drains & plenum drain to sludge tank.

13. Start GT and operate at FSNL for at least 5 mts. With 24 hrs wash3. Divert false start drains and exhaust plenum drain to effluent tank.

press the off line water wash off softswitch on the water wash contro display

Place the master operation switch 20TW in auto or remote mode

In the control panel on the skid set water temperature setpoint to cold and the operation selector switch to auto

The gas turbine is now available for commercial service and may be loaded

The inlet air containing dirt, dust, hydrocarbon fumes etc.attached to compressor blades can be removed by compressor washing and increase gas turbine performance.