The purpose of this paper is to provide quick and accurate methods of determining the change in heat rate, nonextraction steam rate, or turbine capability, resulting from changes in the exhaust pressure of condensing turbines. The methods are applicable for turbines from 25,000 kw to the maximum size built by the authors’ company. It is believed that these data will be useful to the power-station designer in selecting between alternative turbine designs with different last-stage-bucket annulus areas available in the larger ratings, and also helpful in the selection of condenser size. It also will be useful to the operating engineer in determining when condenser maintenance is advisable, for correcting test data to base exhaust pressure for comparison with guarantee or expected information, and showing the desirability of operation with less than maximum condenser circulating-water pump capacity in cold weather.

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