Identifier: steamengineturbi01heck (find matches)
Title: The steam engine and turbine; a text-book for engineering colleges
Year: 1911 (1910s)
Authors: Heck, Robert Culbertson Hays, 1870-
Subjects: Steam-engines Steam-turbines
Publisher: New York, D. Van Nostrand company
Contributing Library: The Library of Congress
Digitizing Sponsor: The Library of Congress

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, at D; then the remainder of the right-hand end of the rotor isbalanced by carrying the condenser pressure over to the outer face ofP2. This plan requires much less enlargement of the casing for thebalance discs; and inside of one stuffing box (at the right) the steampressure is not far from atmospheric, so that liability to air leakage ismuch diminished. In Fig. 356, regular admission is at A, and underheavy overload steam is bypassed to B. The introduction of one or two initial, high-pressure stages of theCurtis type not only replaces the small-area reaction stages in whichleakage is of serious magnitude, but also makes easy an arrangementwhich is more or less self-balanced — see Fig. 26. The double-flowsystem, represented by Fig. 357, still further facilitates the eliminationof end thrust. A good description of various forms of the Westinghouse double-flowturbine will be found in Power for June 16, 1908; all of them have flow 514 DESIGN AND CONSTRUCTION OF THE TURBINE. (Chap. X.
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MO JO ^ 02 P bO § 50 id)) VARIOUS FORMS OF THE TURBINE. 515 from the middle toward the ends, thus requiring two stuffing boxestight against leakage of air into the condenser, just as in Fig. 25.For low-pressure service, the impulse stages are naturally omitted;then flow from the ends toward the middle, as in the Brush-Parsonsturbine, No. 49 in Table 20, reduces the danger of air leakage to aminimum. (e) Low-pressure and Mixed-flow Turbines. — The low-pres-sure turbine differs in no essential particular from the lower stages of thesame type of full-range machine. If the supply of engine exhaust isirregular or intermittent, provision must be made for feeding the tur-bine directly from the boiler. The simplest method is to pass live steamthrough a reducing valve, cutting it down to the normal admissionpressure of the turbine. A reaction turbine must be operated in thisway, unless a special group of high-pressure stages, commonly runningidle, is provided. But an impulse turbine may, mo

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