Last Stage Blade of Steam Turbine

[swapanburo]

I am now working for a project where a GE steam turbine (250 MW, 60 Hz) , originally designed for exhausting into water cooled condenser, will now be exhausting to air cooled condenser. So the backpressure will now increase from 2" Hg to about 4.5 - 5.0" Hg. The turbine has 40 " last stage blade (LSB). Can anyone provide any tip about the maximum allowable exhaust pressure for a GE turbine with 40" LSB ?

 

[alehman]

This forum is mostly for electrical issues. Try Engine and Turbine Engineering forum666