Steam-driven Auxiliaries. A comparison, similar to that outlined
in Figure 1, shall be made for owning and operating steam-turbine- versus
electric-motor-driven rotating equipment. Consider amounts of condensate
returned, possible waste of exhaust steam to the atmosphere, and number of
operating hours using steam-driven instead of motor-driven equipment.
factors when determining the most cost effective alternative. Steam-driven
auxiliaries may be provided in lieu of, or in conjunction with, electric-
motor-driven units. Possible auxiliaries which can utilize steam drives
include feed pumps, condensate pumps, induced draft fans, forced draft fans,
air compressors, overfire air fans and fuel oil pumps. In all cases
sufficient electric-motor-driven units must be provided to permit cold start-
up of the boiler plant.