Turbines, steam induction type

Direct Material Costs — Major Equipment Motor — Induction Type Steam Turbine Driven Air Blower Motor Driven Air Blower One Stage Expander Driven Air Blower Two Stage Expander Driven Air Blower... 

The induction-type turbine is selected when excess steam is available at an intermediate pressure. 

Steam turbine, 53, 146, 282-92, 179 back pressure, 282 blade deposits, 479 condensing, 282 efficiency, 288 extraction, 282 induction-type, 282 paitial admission, 288 rating, 290 reliability, 478 selecuon variable, 275, 285 speed, 278 stage losses, 286 steam temperatures, 284 steam velocity, 288 trip and throttle valve. 479 Step unloading system, 80 Stiffness coefficients, 385 Stodola slip, 153, 155 Stonewall, 186 Straight labyrinth. seal leakage, 532... 

The driver is a prime mover capable of developing the required torque at a constant speed or over a range of speeds. The driver s energy source can be either electrical or mechanical. Electrical energy is used by motors, either of the induction or synchronous type, while the mechanical covers a multitude of sources. It may be a fuel, as in internal or external combustion engines, or it may be a gas, such as steam or process gas used in a turbine or expander. 

A related type of turbine, the so-called mixed-flow or induction turbine, with provision for the use of high-pressure and low-pressure steam in proportion to the available supply, may also be mentioned in this cormection. Generally, the low-pressure steam is expected to carry normal load, and high-pressure steam is admitted only in case of a defldency of low-pressure steam. Even in case of complete failure of the low-pressure supply the turbine may be designed to carry the load with good economy on high-pressure steam alone. 

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