These specifications are limited in their scope to the following types of steam turbines, rated 500 kw and larger, and intended to drive electric generators at constant speed: (a) Straight condensing, straight non-condensing and non-automatic extraction turbines without initial and/or exhaust steam pressure control. (b) Straight condensing, straight non-condensing and non-automatic extraction turbines with initial and/or exhaust steam pressure control. ( c ) Automatic extraction and mixed-pressure turbines
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