Greetings.

In theory, I read that Steam is never allowed to condense in the turbine. During the isentropic expansion of steam, in T-s diagram, Steam should not cross the saturation line and go into the Liquid vapor state. If that happens, the liquid will corrode the turbine's blades and shorten the life of the turbine.

In the last few months, I got the opportunity to visit 2 thermal power plants where the outlet conditions of steam are less than atmospheric pressure (0.1 bar(a) and 45 DegC), which corresponds to L V region. This is also the case in some of the case studies that I've read.

Q1: Theory vs Practical, what is it that I'm not able to connect between these two?

Q2: Power generated from a turbine in simple terms is [Enthalpy(Inlet) - Enthalpy(outlet)] x Flow Rate. Can this really be used in the above case? Does the fluid even after getting converted into liquid contribute in rotating the turbine?

I fear the low enthalpy of the outlet will get me wrong theoretical results.