Document XRrMeZp5aRLOOxo8EgNgNz9bg

EMI RIVER STATION--S UNIT UmATIOn 1 Period Srraicr. hours om** * jXVi December. 1941*........ 361.25 2.690.000 94 * ' January. 1940............. 615 4.720.000 97J Fftbvtiary. 1943........... 552.5 4.220.000 |0| * 3 March, 1948................ 626.25 1,760,000 10) ] o J Unit ulie*0 An ante* m im It, Her. 8AST RIVER STEAM SENDOUT, left, for two typ,Coi ^ j/f season days reflect! (ncrooted um of the plan, fo, ntolifXJ aconuinyjfl HSwMRgUM TURBINE of 7500-KW unit hoi 16 rooction volvex on each of two steam chosts. Gtondi 0*|**h "* I'wm-odmisslon belli, lour oovernor-controlled turbtnc ihofl ore combined lobyrlnth and carbon-ring type dentins units or as sendout to street Queens supplies additional firm capac teem mains. The diversity in times of ity through a 20-in. steam main tying occurrence of the steam and electrical into the system at East River Drive and peak loads allows using the exhaust East 7!si Street. Customer-leased plants steam ns capacity for both the steam . also supplement the capacity in the and electrics) peak toads. (See "Con* uptown district. The two Edison owned solidated Edison Lays Plans to Com* plants, Waterside and East River, plele Waterside Modernization", pp serve primarily at a source of economy 64*7, August 1946, Power.) supply although steam cnpoclty Is avail By operating the steam and electri able on a non-firm baste when not other cal systems as a unit, with due regard wise needed for the electrical system. for loading economy, the maximum Steam sendout from the East River overall efficiency for the combined Station began in the spring of 1932. systems can be obtained. lost R(*er Development. With growth As a part of the genera] moderniza of the steam system load, there has been tion program, the "$" unit installation an increase in the economy sendout at East River Station obtains additional from East River as shown by the curves economy from byproduct electrical for two typical healing season days, at generation Incidental to the delivery top of this page. At East River, steam of steam sendout. The table on p 101 pressure drops about 200 pti between hows the growth of the steam system boiler ond street meins, is on the Mol- and the -extent to which it has been Her chart, top of p 99. Compared to economical to supply steam (tom the usual turbine practice the amount of Edison electric plants. - energy available per lb of ateam is System Development. The Nee York small, but conservative estimates of Steam Corporation, largest district- probable station sendouts showed that ' steam supplier in the world, serves an o turbine to accommodate a flow of extensive area in Manhattan with steam about 500,000 lb per hr would be the generated in several sources. The prin most economical site. This led to cipal stations and the S4 miles of un selecting a 7500-kw turbine-generator. derground steam mains are ahoyro on The map, p 99, shows East River the miy). The system has developed in connected to the steam-distribution sys two areas known as the downtown and tem through a 24-in. main cutting across uptown districts. . A steam main ties Manhattan trom east to west Com the district together and permits a lim pletion of the Stuyvessnt Town and ited supply of steam to the downtown Peter Cooper Village housing develop district from uptown plants. ment by the Metropolitan Life Inaur- Burling Slip Station supplies the ance Co, directly adjacent to the sta bulk of the downtown district steam, tion will increase the quantity of ttenm supplemented by a small plant io tho that can be supplied economically from basement of the Woolwoilh Building East River. These projects, partially on Park Place and by customer-leased completed, ere supplied through an plants. additional 24-in. main, which is being Four plants owned by the Steam extended up First Ave to connect to Corp serve the uptown district. The Kip's Bay before the end of this year. Edison-owned Ravertswood gas plant in This main VvU ultimately increase East River sendout capacity to sbootM 900,000 lb per hr and permit greater^ flexibility in the loading of the lhn2 major stations supplying the optan* district. It will also provide exiensiflrfj of service to prospective consumers^ a reasonable distance from the msia.^ The S Unit. The new unit si Zutyi River was placed in operation Decern-? ber 16, 1947. Since then it has op.$ erated at practically maximum outpui/f Outagea have been limited to adjust ments usually needed for initial opera tion to reap maximum benefit from its byproduct generation. The unit consists of a 7500-kw 3600-1 rpm turbine driving a 3-phase 60-cycle 13.8-kv 0.6-p( generator. Turbine-' throttle steam conditions ore 375 psi| and 700 F exhausting to pressures rac ing from 140 to 180 psig. AllisChalmers Manufacturing Co built the unit. Turbine performance depends markedly on the backpressure for this New Tort Steam Corp Station Sendout Capacllj Station Lb per bow Kip's Bay..... .... 2,070,000 Burling Slip..... .... 1,550,000 59th Street...... 165,000 60th Street__ 340.000 66th Street..... 255,000 Park Place...... __ 125,000 Ravenswood.... 620,000- plants... .... 2,767,000 Total............ .... 7,002,000 Waterside....... East River...... J 2,300,000- OlWMUM. vba bm naslrud tee too (mi POWER MV ptfiort expansion range as shown by the plot chart, below. Exhaust sleam must Wit desuperheated before delivery to the feeei. wjhe high-pressure cylinder and exjrfouit end comprise the turbine casing, l(ieih being split horizontally. Steam -'vjnm the two steam chests enters the fytobine'i four steam bulls through flexJyibls piping connected to both upper ;$ad lower halves of the casing, ace cross section above. Each steam `c/tiul hal four governor-controlled '.->Tshef regulating ateam admission into wjhi 16-stsgc reaction-bladed turbine, -^fleing bolted solidly at tho low-pres- end, the turbine casing expands 5&wvd the high-pressure or thrust end. jFjuibjiity of lhe webs supporting the ijyKnut end permits free expansion of tide turbine cylinder. ^-.Tbe labyrinth seals on each end of ttOu shaft are made up of several rowa S of radial spring-backed labyrinth strips having several oenllng edges. A leakoil at obout 10-psig pressure between the labyrinth and carbon rings vents to the station auxiliary exhaust header. A leakoff. at slightly less than atmos pheric pressure between the two out side rows of each gland prevents steam leakage into the turbine room. An eductor withdraws tiie steam from these points. Gavemlag. Each of the two steam chests has a throttle valve of the singleseat balanced type with built-in pilot valve that trips on overspecd or -by manual operation. Each ateam-admioeion valve, built as e separate assembly and spring loaded, opens and cloies by earn action. An operating mechanism connects the cams to the power cylin ders. A standard AUls-Chalmers governor gear operates a power oil relay, which in turn controls the power cylinders. A (lyhell-type overspeed governor oper ates mechanically the throttle-valve trip ping mechanism. Normally the backpressure regulator controls the turbine-steam exhoust pres sure to match the sendout requirements, varying the electrical output to suit, and tho regular turbine-speed governor supervises the overspeed control. A backpressure regulator opens the steatn-fnlet valves on a drop in system pressure. In an abnormal drop, such as a main break, the load-limit regula tor functions to adjust the inlet valves and prevent an overload on the unit. Generator. A 45-kw 250-v main ex citer and 3-5-kw 250-r pilot exciter serve the generator on this unit. The unit is air-cooled by a closed system using 2-section finned-tube cooler. Fresh makeup water !or the main sta tion serves as the cooling medium, dis charging to the station storage tanka from the generatoi air cooler. Since East River is a 2S-cycle sta tion, this 60-cycle unit ties into the Waterside Station bus through a 13.8kv feeder over a mile long. A pushbut ton outomstie synchronizer phases the generator to the bus. IOOO * &TUM-FLOW CURVES show appreciable b^eoied output from lowar backpressure gjr^QWER Moy 1940 NEW YORK STEAM CORPORATIOR 10AD GROWTH Sendout from Edison plants Peak sendoal Year Million (b % of total rate, toper hr 6,060 1,762,000 12,916 707 5.5 4,728,000 14.7SS 1,046 7.1 5,773,000 14,095 1,915 13.6 4,849,000 17,903 7,845 43.8 7,432,000 1947............ 18,212 8,974 49.1 ,6,966,000 Nviotat*: lAl-lrl-lienuttBpienetk mAKii f inpenMik T.TII.SM IS nr Br toner* smvom a *a S aa <0 F*S . SSU (299) 101