Gas Turbine's Compressor Makes Sound During Shutdown

M

Thread Starter

manoj agrawal

Dear Friends,

We have hitachi frame 5 Gas turbines; from last few days we have been finding a problem of huge sound from compressor during machine shutdowns.

We have traced that the sound appears when bleed valve opens around 88 percent speed. But on cross checking we have found out that bleed valve opens at correct speed (when it supposed to open) and IGV opening is also correct at the time of bleed valve opening.

No changes have been made to shutdown FFD of the GT.

please suggest the reason for sound.
 
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