Page 261 - Steam Turbines Design, Applications, and Rerating

240 Chapter Twelve

Figure 12.19 Actual water wash results and analysis of condensate effluent from a
4860 kW, 6230 r/min back-pressure turbine (550/55 psig, 750°F; 38/4 Bar, 400°C).
(Dresser-Rand Company, Wellsville, N.Y.)

The turbine may be put on the line by increasing the steam temper-
ature at the previously recommended rate (25°F or 14°C increase per
15 min) by slowly closing the feedwater valve to the mixer. When nor-
mal steam temperature is reached, the trip-throttle valve may be
closed to a point where the pressure ahead of it is brought up to line
pressure, still holding speed at one-fifth to one-fourth normal. The

Figure 12.20 Conductivity vs. time plot obtained while water washing a turbine.
(Dresser-Rand Company, Wellsville, N.Y.)