. Electrical world. on of the s,ooo-kw unit showsthe general arrangement of the main cylinder body, bearings andauxiliary parts. The unit rests upon a single bedplate cast in twosections, secured by shrunk links. To the bedplate, which is heavilyribbed to secure rigidity, are bolted the pedestals, generator casingand turbine body, but the bedplate itself is not secured to the foun- 5. & i% \ \ \ V HorlzuutCorl bV VerticalCurliss 0 SteamTurbine , 1 1 0 1,000 3,000 3,000 4,000 5,00u Electrical Horse PowerFIG. 2.—C0MPAR.\TIVE FLOOR SPACE OCCUPIED BY PRIME-MOVERS. dation by other means than the we
. Electrical world. on of the s,ooo-kw unit showsthe general arrangement of the main cylinder body, bearings andauxiliary parts. The unit rests upon a single bedplate cast in twosections, secured by shrunk links. To the bedplate, which is heavilyribbed to secure rigidity, are bolted the pedestals, generator casingand turbine body, but the bedplate itself is not secured to the foun- 5. & i% \ \ \ V HorlzuutCorl bV VerticalCurliss 0 SteamTurbine , 1 1 0 1,000 3,000 3,000 4,000 5,00u Electrical Horse PowerFIG. 2.—C0MPAR.\TIVE FLOOR SPACE OCCUPIED BY PRIME-MOVERS. dation by other means than the weight of the unit. Steam and ex-haust connections are made beneath the floor level. In the smaller machines of this type the cylinder barrel and bothjournals are cast in a single casting, thus largely minimizing ma-chine work. In the large machine, however, the barrel is cast intwo sections united by links, the outboard section carrying the journaland worm casing, and the inboard section the journal and exhaust. Fig. I.—5,ooo-HP Steam Turbine. is taken as the basis of comparison. This point of relative economyof space is well illustrated by Fig. 3, which represents, in plan, thecomparative space occupied by the 5,000-kw Manhattan Railway(New York) engine type units and the 5,000-kw Westinghouse-Par-sons turbine units. In point of speed, the new type fulfils the demand for a unit oper-ating at moderate speed. The 3,000-kw units operate at 750 ,the 2,0oo-kw unit ,200 to 1,560 , and the i,ooo-kw unit at1,500 to 1,800 , depending upon the frequency desired. Thesespeeds, although not comparable to engine speeds, do not imposemuch greater stresses upon the rotating parts, and in addition securethe great advantage of reduction in the bulk, weight and cost of theunit opening which extends through the bedplate. As in former types,linear expansion and contraction of the turbine are provided for bya sliding foot. The inboard journal pedestal is bolted securely tot
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
