OBJECT AND SCOPE 1. The purpose of these specifications is to recommend minimum functional and performance characteristics relating to the speed-governing of steam turbines in?tended to drive electric generators that may@ if desired@ be included in prime-mover purchase specifications. 2. 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 tur?bines.