By William P. Sanders
This ready-reference comprises helpful perception for the engineer confronted with layout and manufacture judgements. A continuation of Sanders' volumes on upkeep and service, this quantity represents the 1st in a next quantity set on mechanical layout and manufacture, finishing the rest element of his renowned seminar. during this quantity, Sanders turns his concentration to layout suggestions and the demanding situations confronted in making a choice on and arranging the parts to optimize unit functionality potency, reliability, and defense, delivering the reader with the mandatory info to judge the functionality, refurbishment, and upgrading of a unit. This publication permits you to: decide upon the appropriate elements and locate optimum unit association; comprehend the mechanical layout and improvement strategy; and, manage and get ready functionality trying out
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Additional info for Turbine Steam Path, Volume IIIa Mechanical Design and Manufacture
Having established the design degree of reaction, this will also establish the exhaust enthalpy from the stationary blades. Therefore, the degree of reaction will also establish the pressure at the stationary/rotating blade row interface. The selection of this interface point or stationary blade discharge pressure defines the point B at pressure Pm. The intersection of this pressure locus Pm and the state line, point C, defines the steam conditions at exit from the stationary blades. At this point the steam has conditions Pm, Vsc, and Tc.
Similarly, the high-pressure heaters have a TTD of -3°F and a similar arrangement in the drain section. There is a pressure drop in the lines connecting the heaters to the turbine extraction points. 1 psia. 0 psia, indicating a 6% pressure drop. 4 psia, again indicating a 6% pressure drop. Different pressure drops could have been used. But this affects pipe size and therefore plant costs. It is always necessary for the engineer responsible for defining plant parameters to optimize these various costs against unit performance.
Fig. 1-14 The Efficiency of a Pure Impulse Row as a Function of the p Ratio for Different Steam Discharge Angles 34 The Basic Considerations ofThermodynamic Design Comparison of the reaction and impulse stages. To allow a meaningful comparison of these two philosophies, stage design uses two options—one impulse and one reaction—both with a realistic discharge angle. In making the following comparison it must be considered that for the reaction stage the efficiency is that of the gross stage r/gs and for the impulse that of the blade row r/b.