Significant flexibility is achieved when combining a non- condensing turbine with a condensing steam turbine, or when a steam turbine supplies controlled pressure steam to more than one process header. This is accomplished with a single- or double-auto extraction condensing steam turbine generator. (See Figure 6.) Figure 9 illustrates a performance map (flow vs. kilowatt output) for a single auto extraction steam turbine generator. This generic performance map applies equally to single-auto non-condensing and to single-auto condensing steam turbine generators. The maximum throttle flow line (B-C) defines the maximum guarantee steam flow that can be admitted to the high-pressure inlet of the steam turbine, whereas the zero extraction line (E-D).
