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FILE NAME: Power Generation (POW) DATE: 1951 Feb DOC#: POW018 DOCUMENT DESCRIPTION: Published Article from Trade Journal V\ Exhibit Number 1 DATE 01/01/46 2 04/01/46 3 02/01/51 Southern Power & Industry Archive List in Exhibit Order DESCRIPTION Southern Power & Industry article by N.V. Hendricks titled: INDUSTRIAL HYGIENEControl of Working Environment is Important Southern Power & Industry article by C.C. Hermann titled: DUST EXHAUST SYSTEMS Southern Power & Industry article by L.W. Cadwallader titled: Potomac Electric Power Company's New Potomac River Station Updated: Aug 7,2001 Printed: Aug 7,2001 C:\WINDOWS\TEMP\SOUTHER POWER IND. ARCHIVE EXHJ.W PD '' Eugene W . O'Brien M anaging D irector Francis C . Smith, Editor Richard L. Priess v A sso ciate E d ito r Hunter Hughes Regional E ditor M . M . Lyon A ssociate J. A . Moody Production M anager Business Representatives Rogers, 299 M adison Ave., ffi New Y ork 17, N. Y.-- Phone gSIffiiWi M urray H ill 2-4959. ^Gerard T easdale, 78 M a n h a tta n ; Ave., New Y ork 25, N. Y.-- Phone M urray H ill 2-4959. . / 1 . D. P arso n s, 185 Je ru sa le m S S S ii Road, Cohasset, Mass. -- ; - \ - Phone, 4-0159. H A.. E. C. Sm ith, 609 C axton Bldg., s ; < Cleveland 15, Ohio.-- Phone Cherry 1-7352. - SSi? O. E. Jo h n so n , 168 N o rth s ' Michigan Ave., Chicago 1, * ' . 111.-- Phone, C e n tra l 6-4131. f I U B. Chappell, A u d ito riu m Bldg., 427 W est 5 th St., Los AngeCalif.-- Phone, M ichigan m m W '' ' . liff R u tlan d , 1762 Poston , Circle, G asto n ia, N. C. -- ; Phone 7995. iattual Subscription-- $1.00 ' Foreign-- $10.00 fiiblisBea monthly at 115 E. Gordon . Dalton, Ga. f g B p I fe.. C SMITH PUB. CO. also o f : T extile Indus- & , ^ ctrical South, Southern :oii r S rei, S o u th ern A u to m o tiv e Southern Buildinq Sup- m , ' jf Plies. Rooke. P re sid e n t; R. P. ?j**9tive V ice-President: .aS^iS^M w ter, Vice-President: Saiith, Vice-President; BfR^.-.'.^aarpieas, T re a s u re r: A. F. I jS ; Secretary. CONTENTS Potomac Electric Power C o .'s New Potomac River Station, by L. W . C a d w a lla d e r........................................... v ............................... 46 Heat Insulation at Morton Salt Co.'s Texas Plant, by R. G . Ganong. . . . 54 Life Sentence for D ie se ls................................................................................ 57 Insurance Cost and Value, by P. A . Sp rin g er.............................................. 58 Atlantic Steel Increases C a p a c it y ................................................................. 61 Maintenance of Anti-Friction Bearings, by E. P. S ta h l............................... 62 Refractories for Wood Waste Boilers, by W alter B. B ry a n t................... 64 Electricity at Work in Industry........................................................................ 70 Modern Trends in Industrial Power Distribution, by D. H. McIntosh. . . . 71 A New Approach to an Old Problem in Heat Balance, by R. A . Cooper, Jr. ! ..................................... ..................................... 74 Consolidated Steel Launches a T u n n el......................................................... 77 Your Compressed A ir S y ste m ........................................................................ 78 Modern Methods for.Gas Firing W et or Dry Feed Lime Kilns, by William T. R o g e rs ................................................................................ 81 How to Replace Standby Storage B atteries................................................ 88 Initial Operation of Centrifugal Boiler Feed Pum ps................................. 88 DEPARTMENTS TACTS AND T R E N D S ............................ 5 BUYERS INFORM ATION ................... 16 TIM ELY COMMENTS .......................... 43 IN D U STR Y SPEA K S ............................ 45 BOOKS ....................................................... 98 NEW S OF THE MONTH .................... 102 NEW EQ U IPM EN T ................................. 126 IN D EX TO A D V ERTISERS ................. 142 \ ' C ontents indexed regularly by E ngineering Index, Inc. C opyright' 1 9 5 1 , b y W . R . C. Symth P u b lish in g Com pany 0"U Executive Offices: SOUTHERN POWER & INDUSTRY. 806 PEACHTREE ST.. N. E.. ATLANTA 5. GEORGIA F ront of building w ith 69 kv switchyard on left and coal handling eq uipm ent in foreground. Potomac Electric Pow er Company's - New Potomac River Station THE new Potomac River Gen erating Station of the Poto mac Electric Power Company is located in Alexandria, Virginia, on the westerly bank of the Potomac River almost opposite the City of Washington and within view of the Nation's Capitol. Planning for this new generating station dates back to 1942, when the site comprising 23 acres was purchased for the construction o f a steam power plant to have an ultimate capac ity of 400,000 kw in five 80,000 kw nameplate rated turbine-generator units. The first 80,000 kw unit was placed in commercial opera tion October 1949. The second unit which was a duplicate, was placed in commercial operation in June 1950. Design Features It was desired to develop the plant on the basis of conservatively designed and rated equipment suit able for reliable operation for long periods of time with a minimum of maintenance requirments. After careful consideration, it was de cided to install initially two 80,000 kw nameplate rated turbine-gen erator units with throttle steam in d e p e n d e n t 8 0 ,0 0 0 lew u n its o p e ra te d a t 8 5 0 pounds and 925 F , should give high load fa cto r service w ith m inim um m aintenance. conditions of 850 psi gage, 925 F, with five points of steam extraction for feedwater heating. The Company had experienced satisfactory operation with pre vious unit system installations con sisting of one boiler for each tur bine-generator and it was decided to continue with this type of in stallation at the new plant. A single boiler with a continuous rated capacity of 800,000 lb per hr ?was provided to furnish steam to each 80,000 kw turbine-genera tor. No cross-connections were provided between the two boilers or turbines. Particular attention was given to building volume and equipment layout to provide ample space and easy accessibility to equipment for operation and maintenance. And since the location was in a resi dential area, it was essential that every precaution be taken to pre vent smoke or dust nuisance. Because of. the location of the plant with respect to the Washing- . ton National Airport, a compromise :;; had to be effected between con flicting requirements of stack | height, therefore height of the stacks was reduced 89 ft below that originally planned. The height , of the radial brick stacks was limited to a distance above the boiler room roof of about one third the height of the boiler room. It was felt that this was the minimum? stack height which would give as surance of proper and safe disper sion of gases and any remaining , solids. At the same time increased velocity of gases leaving the stack was provided for by means of a venturi throat or nozzle built with in the stack. At full boiler load ; the velocity of the gases leaving ; the stacks is approximately 60 miles per hour. Another consideration was the desirability of harmonizing the ex-5 ternal appearance of the station > with the general architectural pat- 46 SOUTHERN. PO W ER & INDUSTRY for FEBRUARY, 1951 MBm S p h 'of the area and particularly ilith that of near-by apartment abuses. This was accomplished by 'the use of red exterior face brick trimmed with gray limestone. The J i l l 0f glass block windows added -materially t+o,, th'e" appearance of "U p b uilding- G enerating Equipm ent if\ The turbine-generators are Gen- gral Electric, single-cylinder, 1800 rpm, 80,000 kw nameplate-rated machines with throttle steam con- itions of 850 psi gage, 925 F, steam ''flihg extracted at 3rd, 6th, 9th, .;2th and 14th stages for feedwater ^ll&iihg- f five extraction /feedwater heaters, the 14th is a low-pressure closed heater with drain cooler, the 12th is ; a direct-contact heater, the 9th is 'Mllpw-pressure closed heater, the 16th is a standard tray-type deae- bank and the plant, the circulting water pumps were located in a pump house on the river bank and the circulating water pumped through steel pipes to the condensers in the turbine room basement. Inside the station this pip ing is largely run overhead in or der to eliminate foundation dif ficulties due to subsoil conditions. Three boiler feed pumps, each driven by an 800 hp, 2300 volt, 3600 rpm squirrel cage induction motor, are provided for each turbine generator unit, any two of the pumps being capable of meeting full load boiler feedwater requirements. No steam-driven boiler feed pumps are provided, The only steam-drivea auxiliaries in the plant are the auxiliary lubricating oil pumps on the main turbines. The steam generating units are By L .W. Cadwallader G eneral Superintendent of G enerating Stations Potomac Electric Power Company W ashington, D. C. the Combustion Engineering thr- drum, bent-tube type with water- cooled furnace, pendant-type su- perheater, economizer, tubular air preheater, vertically adjustable tangential burners and cC,owmv.bwuis,t+i4own Engineering Raymond bowl mills. The furnace is designed for initial operation with pulverized coal, and provision has also been made- for possible future use of fuel oil or natural gas. The unit is arranged to burn a wide range of West Vir ginia and Pennsylvania coals, ai follows. Btu as fired 12500 - 14500 Ash fusion Temp. 2100-2800 F Ash content, % 4.5-12 Sulfur, % 0.5t3.5 Fixed Carbon, % 53-80 Grindability 60-100 Design pressure for the boilers is 1000 jpsi gage with operating steam conditions at the superheat er outlet of 875 psi gage, 925 F. As indicated in the accompanying cross-section, the furnace has a dry hopper bottom with shaded ashpit. This design of furnace bot tom has resulted in a substantially w m l. Israting heater with boiler-feed suc tion tank, and the 3rd is a high.pressure closed heater. The generator is hydrogen cooled /and has a nameplate rating of 80,SOOO kw at 0.85 power factor and 0.5 psi gage hydrogen pressure. It ///is designed for 13,800 volt, 3 phase, JfijO cycle service with direct-conIJneqted main and pilot exciters. One '1motor-generator set is provided r emergency excitation of either T urbine R oom at P epco's new $25,000,000 P otomac River P ower P lant. The 80,000 kilowatt turbo- generators at this plant are the largest on the P epco system. i Each turbine exhausts into a 75.000 sq ft, two-pass condenser, captaining 12,720 Admiralty metal /tubes, No. 18 B.W.G. 26 ft long and TM//8 in. O. D., through which cool| ing water is pumped at the rate 'Of/66,900 gpm. Condenser air evacuation is performed by two motor-driven, rotary dry vacuum pumps for each unit. Each pump has a capacity of jfftP: cfm of air-vapor mixture at jffil/in. Hg abs pressure. ^/Condensing water from the river i^//supplied by tv/o vertical cir,:.fi|lating water pumps per con- each pump having a rat`f g p f 33,450 gpm at a total head of i^|ft. Because of subsoil limitations and the gradient between river Shi ITUrMi nAinpn a iliai irrnv f _ CCDOI Boiler instrument and control panel. com; tern eon cooler ashpit than the conventional the same system which empties pers, in operating service under Afte symmetrical design, and is be automatically all of the 33 fly-ash normal conditions the superheater folic lieved to be the first installation hoppers of each boiler unit. bypass dampers remain closed. of this type. It is of particular im Specifications call for a iotal The boiler is provided with four portance in this installation be steam temperature at superheater bowl mills with sufficient capacity cause the furnace bottom ash is re outlet of 925 F from 425,000 lb of so that any three will carry full moved in a completely dry state by steam per hour up to the maxium boiler load with good quality coal gravity discharge through man evaporation rate of 800,000 lb per and four will carry full boiler load ually operated gates into a vacuum hr. Operating experience indicates with the worst coal specified. There transport system. It requires the that 925 F can be maintained over are four levels of coal burners or time of one operator for a period a wider load range than was spe a total of 16 burners. The second of approximately 20 minutes once cified. While the design provided ary air dampers for each level of every 8 hours to remove the dry for primary steam temperature coal burners are remotely position furnace bottom ash with this control by means of tilting `burn ed from 5-point selector switches vacuum transport system. This is ers supplemented by bypass dam mounted on the boiler gage board Central switchboard room. Blank panels are for 3 future units. SOUTHERN PO W ER & INDUSTRY for FEBRUARY, 1951 , na actuating motor drives mountad on burner windboxes. This ar6 ngement of damper control is an Innovation and lias been quite sat- "1. .factory. ' The steam generating unit has a maximum continuous rating of 800.000 lb per hr with superheater outlet conditions of 875 psi gage and 925 F. and feedwater tempera tlll-e of 420 F entering the economi zer Predicted boiler performance when burning coal and operating under above conditions is 88.9 per cent. The furnace heat release at 800.000 lb pel' hr output is 16,900 Btu per cu ft per hr and the net heat available for the entire pro ject radiant surface is 102,000 Btu per sq ft per hr. Each boiler is equipped with a complete steam soot blowing sys tem for furnace walls, superheater, economizer and tubular air heater. After some experimentation the following schedule of soot blowing was established. Furnace w alls As needed to remove spotty ash accumulations. A portion of the 12 wall blowers are operated on an average of once every 24 hrs. S uperheater and econom izer Once every 2 weeks. Tubular air heater No soot blowing. FLY-ASH CONTROL Every effort was made in the design of this station to eliminate any possible nuisance due to dust and stack emission. It was expect ed that coal would be the primary tuel and to date only coal has been burned. To reduce stack emission to a minimum, it was decided to install in series both a mechanical fly-ash collector and an electro static precipitator three sections deep. These are located between ibe air heater and the stack, the Hue gases passing through the me chanical collector first. The air beater, mechanical collector and electrostatic precipitator are divided into .four sections across the "loth of the steam generating unit. With dampers at the inlet to, each section so arranged that one fourth the precipitator- at a time ran tra p p e d in still gas. Performance INDUCED DRAFT FAN. SHOWTNC 7 0 0 HP, 2 3 0 0 VOLT SQUIRREL CAGE INDUCTION MOTOR WITH DIRECT CONNECTED EXCITER FOR VARIABLE SPEED MAGNETIC^ o u u n r BOILER FEED PU M PS IN CENTER BACKGROUND---3 PUM PS PER BOILER. Raymond bowl mills--4 per boiler. SOiitmcom DnwPR a ttvjniirtry for FEBRUARY. !95i LEGEND FLOW - t^ S / HR , _ FRESSURE '.P S lA jV \ ; TEM PERATURE' F R I.' -E N T H A LP Y -B T U /LB : HW '*' ; 40,120 Q 1237 H GENES ar fl OUTPUT 8 2 ,6 8 5 K ,V / 4 8 9 ,7 0 8 Q 9 7 8 .5 H V l . o " HG: ABS, | 4 0 l . 3 ". , [ *h >Si FA T. RATE 686,170 (1467. i 51 5P _2JI 2_ 198,3h 13.72 Pt fS^M 9 0 2 5 B T U /K W HR A KSJl'' ELEOTRIOFO,M00. 40,BO, Kif.- S 85.P F 0 I.hc , 8?0 ssrs - 925 t?- 1.0 S? aoacua; cocid pggatfsp has been gratifying as there is little Soot blowing and cleaning of elecvisible discharge from the stacks, trostatic _recipitator plates have Combustion Engineering Co. Steam Generating Unit. B I_____ _ ppl& T ; 'fMXi'r had little or no effect on sta appearance. COAL HANDLING Bituminous coal from Pennsy vania or West Virginia is deliver ed in railroad cars to the plant ya which has a capacity of appro imately 100 coal cars. The cars weighed on an accurate track sea and then unloaded by a rotary dumper. With the layout provide it is possible to weigh, dump shift one railroad car of coal eve six minutes. All shifting in plant yard is performed by a ton fireless locomotive which charged once every four hoi from the main boilers in power house. The fireless loconicfc tive has rthe advantage of cleans liness and low operating and main tenance costs. Coal from- the car dumper can be delivered by conveyo: belts at the rate of 700 tons hr to Bradford coal breaker. F this point the coal can be livered at the rate of 350 tons hr to both the storage area to the station bunkers. When the generating capacity; of the plant is increased by the installation of additional units, is contemplated that the rate handling coal to the bunkers wj| be increased to 700 tons per hr by the addition of a duplicate belt con. veyor between the Bradford coal breaker and the bunkers. The coal storage area has a ca pacity of approximately 175,0 tons when stored to a height of ft. All storing and reclaimings coal is done with bulldozers. The is one coal bunker per boiler, eat bunker having a capacity of 12 tons. From the bunkers the c flows through motor-driven feeders located on the main ope: ting floor. These feeders reguli the flow of coal to the bowl The rotary railroad car dum; is totally enclosed, a rolling st< door being installed a either to permit the shifting of full ci onto the dumper and the removi of cars after they have been urj| loaded. Elaborate systems of dust collecting equipment have beefr. provided for the rotary-car 'd u n ^ sH I er house, Bradford breaker house ` coal bunkers in the station, and alj||| intermediate belt conveyor junC tion; from then enii K ielivec.p nt yartt, iPProxL' i ;aps are;^ ;k scale ' ary car-:.' ovided, nP and I every;?; in the# r a 50, ? c flH hours in theicoino- clean-fjj mairi-:.-: -' iMU'.Vl >er pit | : - nveyor 'jlfll tion points where dust could result ns p e j ^ l ' from coal transfer. The fine dust From thereby collected is conveyed to be de- f-\ the coal bunkers by a vacuum ns per :; \ system which removes the dust a anc |g f ffrom the collectors and discharges y;asKBggia ga&gppfc'it into either coal bunker. pacit;?, To wet the coal as it is placed in >y the storage, a chemical spraying sys lits, it" - tem is provided. It is also planned ate of. I to spray the surface of the storage s will^jj, .... pile with heavy fuel oil to prevent hr by | J | | | t coni coal- ; dusting. ELECTRICAL FEATURES a ea75,000 i f Each of the 80,000 kw, 85 per . cent power-factor generators are " directly connected to two 60,000 of 3U ng of There kva transformers, to step up the energy from 13,800 to 69,000 volts ; for transmission to the load. En gineering studies showed this to be more economical than tying the : generators together at low voltage, and stepping up through trans pera- formers tied directly to the 69,000 ulate volt cables. The 13,800 volt genera tor leads to the transformer ter- "minals are made of the isolated phase construction. These consist r end; i cars novalim m l un ? dust I been jpi .. ump- ouse, - -V-gr ? - id all : : june- {S of three 20% in. diameter outer aluminum enclosed, dust and vaPor-proofed pipes. Inside of each Pipe a 6 in. copper tube is used as a conductor which is securely braced at each 90 degree angle and supported and insulated by por celain insulators at five to eight feet intervals to withstand the shock of short circuit. ?;? Mai oten-nn transformers are P lant cross- section showing arrangement of equipment. Operating data covering N o . 1. unit from Oct. 16-'49 to J uly 31-'50 and unit N o. 2 from J une 12 to J uly 31-'50. equipped with fans arranged to blow air on the radiators to per mit carrying their rated load with out excessive temperature rise. The main 60,000 kva step-up transformers are connected on the 69,000 volt side to the main sta tion buses through pneumatically operated oil circuit-breakers which are capable of opening short cir cuits of 2,500,000 kva. The trans formers, oil circuit-breakers and associated high voltage equipment are located in a switch yard adjacent to the turbine room. Ulti mate layout of the station pro vides for five sections of 69,000 volt bus, each fed by two 60,000 kva transformers from different generators, and each feeding two to three 45,000 kva cables. These cables are connected to the bus by oil circuit-breakers similar to those connecting the transformers. In case of a short circuit, the proper breakers to disconnect the faulty equipment are opened auto matically by relays. Normally, the bus sections will be tied together only through the generator trans formers, although they can be tied directly together by means of oil circuit-breakers when a generator is shut down for any reason. The purpose of this bus arrangement is to "cushion" and control the large amount of generated power and to prevent excessive short circuit currents at the generating station. In spite of the heavy cost in volved, it was necessary that all lines transmitting the energy away from the station be under ground. Much of the territory be tween the station and the city of Washington has been carefully landscaped to provide scenic ap proaches to the city, and the ap pearance of overhead lines would have been objectionable. Studies showed that three 600 MCM-conductor, 69,000 volt cables in conduit would be more eco nomical than higher-voltage, sin gle-conductor cables, or cables pulled in pipe. This was the high est voltage three conductor cable available and two such cables furnish sufficient capacity to load one 80,000 kw generator. Con ductors and insulation are en closed in a lead sheath and a nitrogen gas pressure of 35 to 45 lb is maintained inside the cable. This is believed to be the first in stallation of gas-filled 69,000 volt cable. This so-called "gas-filled" cable was preferred to "oil-filled" cable because of lower installation and maintenance costs. The out side of the lead sheath is rein forced by bronze tapes and the whole cable enclosed in a neoprene jacket for protection against mechanical and chemical damage and electrolysis. Due to unstable earth conditions over a part of the route between the generating station and Wash ington National Airport, the cables in this section are of the sub marine type covered with metallic armor and no conduit is used. This permits movement of the cables, without damage, when the earth support moves. Many of the fea tures described above are novel but all are based upon sound engi neering and the lines should give high-quality service. Based on a nameplate generator rating of 160,000 kw and includ ing cost of site and everything con structed on it except outgoing feeders and the external distribu tion system, the cost of the Potomac River Generating Station will approximate $155 per kw. Details on performance and effi ciency are given in the accom panying summarized operating re port. -Principal Equipment- Generating Station "C" , Potomac River, Potomac Electric Power Company GENERAXi DATA Name o f S tation ................... Station. Station Site ......................... S team C o n d itio n s ................... Cooling W ater Source . . . . Design and Construction . . Corporation. Potomac River Generating . .. Alexandria, Virginia 875 psig, 925 F Potomac River Stone & W ebster Engineering TTJRBINE-GENERATOBS T u rb in es ................ .. Two-- General Electric Com pany, 80,000 kw, 850 psig, 925 F, 1 in. Hg abs, 5 bleed points, 1800 rpm. G enerators ............................... Two-- General E lectric Com pany, 1800 rpm, hydrogen cooled, 80,000 kw a t 0.5 psig hydrogen pressure, 13,800 volts, 3 phase, 60 cycle, 0.85 pf, 94,117 kva, and direct connected main and pilot exciters. M ain E x cite rs ....................... Two-- General E lectric Com pany air cooled, 300 kw, 1800 rpm, 250 volts. P ilo t- E x cite rs ....................... Two-- General E lectric Com pany air cooled, 4 kw, 250 volts, 1800 rpm. CONDENSING EQUIPMENT S urface C ondensers ............ Two-- W orthington Pum p and Machinery Corp. 75,000 sq ft, 2-pass, inner air coolers and hotwell. Circulating W ater P um ps.. Two per condenser--W orthing ton Pum p and M achinery Corp. vertical, 33,450 gpm, 49 ft total head. Circulating Pum p Drives .. Allis Chalmers M anufacturing Company 600 hp, 590 rpm , 2300 volts, 60 cycle. Rotary Vacuum Pumps . . . . Two per condenser-- Kinney M anufacturing Company 540 cfm a t 1 in. Hg abs, approximately 29 lb per h r w ater vapor and 16 lb per hr air at 70 F. V acuum P u m p ^ D riv e s .......... G eneral E le ctric Company 40 hp, 350 rpm, 440 volts, 3 phase, 60 cycle. C irculating W ater V a lv e s.. H en ry P r a tt Company, Inc. Chlorinating Equipm ent . . . W allace & Tiernan Products, Inc. A ir Removal Pum ps .......... T hree-- N ash E ngineering Com pany. STEAM GENERATING EQUIPMENT B o ilers ............................ Two-- Com bustion E ngineering- Superheater, Inc. 8 0 0 ,0 0 0 lb p er hr continuous, 875 p sig, 925 F , 36,020 sq ft, th ree drum, b en t tube. Superheaters ................. Two-- Com bustion E ngineering- Superheater, Inc. 3 stages, low-temp 12,300 sq ft, Furnaces int-temp 12,300 sq ft, high-temp 4,700 sq ft, by pass control and tilting burners, tem perature con trol range 450,000 to 800,000 lb p er h r. ................................... Two-- Com bustion E ngineering- Superheater, Inc. completely w ater cooled, shielded type hopper bottom. Econom izers ............................ Two-- Com bustion Engineering- Superheater, Inc. continuous finned tubed, integral set, split type, 17,650 sq ft. P ulverizers .............................. F o u r p e r boiler-- Com bustion Engineering-Superheater, Inc. Raymond No. 533 bowl mill, 28,400 lb per hr, integral exhauster, variable speed roll type feeder. A ir P re h e a te rs ........................ Two-- Com bustion E ngineering- , , _ . Superheater, Inc. tubular, 4-pass, 122,500 sq ft. M echanical F ly Ash Collector One per unit-- Aerotec Com pany multi unit centrifugal fly ash collector, maxi __ ^ mum flow 325,000 cfm a t 330 F, 85% removal (by w eight) of suspended m atter. Electrostatic P re cip ita to rs.. One per unit-- Research Cor poration Cottrell perforated plate type, four units of 15 ducts each, three sections long; norm al flow _ 294,,000 cfm at 320 F, efficiency 96% . Soot B low ers ................... . Diam ond P ow er S pecialty Cor poration. No. per Boiler: F u rn a ce W all ........................ E conom izer ............................ A ir H e a t e r .............................. S u p e r h e a t e r ................................ S creen T u b es ............................ C irculating T ubes .................. 12 Type IS 8 Type G9B 8 Type H 4TypeIK 4TypeIK 4 T y p e G9B i f e s S ? * 5"": S . S e Ti I SOp" r t Tifflk . . . " .ii.......... Missouri Boiler & Sheet Iron - W orks. _ -- ^ Safety Consolidated Div. Manning, & Moore ,, . -nd Check Valves . . . Edward Valves, Inc. ' V alves ..................... Y arnall-W aring Company 2 rflr Columns and G ag es.. Diamond Pow er Specialty Oorp. OE l a n e o a s v X e s .` . . . . H ancock Div. M anning. Max- - M1SC ' well & Moore * DRAFT EQUIPMENT ' jBs&fe -- , ,, r a f t F an s ............... Two per For Blower Corporation 110,000 efm, head, 1200 rpm , constant speed, louvre type damper in fan outlet. Vt,zinced D raft F an s ............ Two p er 1* Blower Corporation 190,000 cfm, tion, 720 rpm, variable speed, control. boiler-- American 100 F, 11-m. total inlet-vane control, . boiler--Am erican 330 F, 15*in. suc magnetic coupling J fa S & F *. f t u n n e Co Forced DD rra^ftFFaann DD rriivvee . . . . Electric M achinery Manufac AllrispmC_h2a8l0m0ervsoltsM> a3nupfhaacstuer, in6g0 Tniinced D raft6 F an D r iv e .. Allis Chalm ers M anufacturing is ? .;. Company 700 hp, 900 rpm , 2300 volts, 60 cycle, 3- phase. FEEDWATER SYSTEM Condensate B ooster P u m p s.. Ingersoll-Rand Company, 2 per unit, 525 ft head, 1700 gpm, 1750 rpm. t f e Booster P um p D riv es.......... W estinghouse E lectric Cor poration 300 hp, 2300 volts, 3-phase, 60 cycle, 1800 rpm. . k * ; Closed H eater 3 rd S t a g e . . . One per u n it-- W estinghouse Electric Corporation 3,170 sq ft, quadrant type head, vertical, w ith U-tube removable bundle. Flow from heater 810,000 lb per hr a t 420 F. &&.' Closed H eater, 9th S ta g e .. One per u n it-- W estinghouse E lectric Corporation 3,000 sq ft, vertical with Utube removable bundle. Flew from heater 710,000 Hgfck. . lb p er h r a t 291.8 F. Closed H eater, 14th S ta g e .. One per u nit-- W estinghouse Electric Corporation 3-310 sq ft vertical with t i tube removable bundle. Flow from heater 615,000 lb p er hr at 163.3 F. Drain Cooler, 14th S ta g e .. One per unit-- W estinghouse Electric Corporation 320 sq ft, vertical with t i tube removable bundle. Flow from drain cooler 615,000 lb per h r at 104.4 F. Evaporators ............................ One p e r u n it-- W estinghouse Electric Corporation 850 sq ft, horizontal, sub merged bundle, thermal descaling. Steam flow from evaporator 16,000 lb per hr. Evaporator Deaerating F re h aater ............................. One per u n it-- W oxthington WZt Pum p and M achinery Corp. Capacity 18,110 lb per ' Sg?, hr. 4 ; Evaporator C o n d e n s e r .......... One p er u n it-- W estinghouse m $r\ Electric Corporation 1,060 sq ft horizontal U-tube removable bundle. i 12th Stage Nondeaerating H eater ................................... One per u n it-- W orthington Pum p and M achinery Corp. vertical, single shell, tray, 710,000 lb per hr, temp from heater 215 F, 16 p sia steam pressure. bth Stage D eaerating H eater One per unit-- W orthington fefV.U: Pum p and M achinery Corp. horizontal, two shell, storage, tray deaerator; 810,000 lb p er hr, 152 psia steam pressure, temp from deaerator 359 F, 2 vent n i condensers, 16,275 gal storage tank. BoUer F eed F u m p s ............ Three p e r u n it-- W orthington Pump and M achinery Corp. balanced, 6 stage, volute, centrifugal, 1075 gpm at 360 F , 2480 ft total head, Knv-i * rpm* constant speed. oner Feed Pump D riv e s.. General Electric Company 300 j Extraction NoMatnrnPm' 2300 TOltS' 60 7<flei cage- ValVSS ................ .................. Atwood and M orrill Company COAL AND ASH HANDLING EQUIPM ENT i t lo tarT i 5 e*1 .......... T he Howe Scale Comapny m .- tary R a^ a<? c " D um per L ink B elt Company, capacity 0031 Eim ker^D upIex G a te s .. Stephens-Adamson M anufactur- Bradford B reak er ................. Pennsylvania C rusher Com- A utnm . Pany. capacity 700 tons per hour, 1-%/r openings. Var-ni?mtl0i Coal S< . .......... Stock E ngineering Company s Vacuum-cleaning E quipm ent Billmyre Div., Lam son Cor- -tTf' *_ poration. EiUiPU'cut.. P angborn Corporation Windswept D ust Valves . . . The Allen-Sherman-Hoff A.u Tr pauy, hand operated. Handling E quipm ent.. The Allen-Sherman-Hoff p . , . pauy. ComCom- Belt f c 3TM 8 *j?nlpnumt Coal n 4 y,,r J n ?P er al Handling E quipm ent.. . m g Co. Johnson-March Corporation Rohins Conveyors Division Stephens-Adamson M anufactur- tors ................... ; Three-- Oliver T racto r Com pany, equipped with Heil bulldozers. MISCELLANEOUS EQUIPMENT B 2 S u :S i :ii S S S S s h b , MVafverrf t6d - . S!!a" Chapman Valve & M anufactur- 1500-lh W ei! & ny: . . . . Manning, Maxwell | Moore. E lectric^traveling" C r ^ e " .'. . m U tag^O orgiration A utom atic A ir F i l t e r s .......... American A ir F ilte r co rp o ra V e n tila tin g ''F a n s ................... W estinghouse E lectric Oor- Elev-ators ................. Otis E levator Company. K g f E jector Pum ps . . . Chicago P um p & M achine Corn- Tanks . . ........................ W orks. J. E. H urley Machine & Boiler B F a n s E'.0m -A^- SUPP-ly . S tu rtev an t Div., W estinghouse Service W ater'^Pum p's1'.'____ Two per u n it-- IngeTSoll-Band Company, vertical, 2 stage, 3250 gpm, 1175 rpm. Service W atar D riv es_ ^ ^ ^ 60 ' cycle! F ire P inups3"? . : ? U.3: . S'Ph.a " ` T w o -D e L a v a l Steam T urbine Company, horizontal, centrifugal, 1000 gpm, 139 TDH, 1750 rpm. . ,, F ire Pum p D rives ................. General E lectric Company 50 hp, 4,40 volt, 60 amp, 1764 rpm, d rip proof, squirrel T raveling W ater Screens . . Four---The L ink B.lt Company. H ydrostatic Test Pump . . . W orthington Pump and Ma chinery Oorp. _ M iscellaneous P um ps .......... Yeomans B rothers. Air Com pressors . . . . . . . . . Two-- Ingersoll-R and Com pany. One-- single stage, 300 cfm, 100 psi discharge. One-- two stage, 900 cfm, 100 p si discharge. Floor G r a t i n g .......................... H endrick M anufacturing Com pany. Structural Steel and Bunkers Galvanized Substation Steel Bethlehem Steel Company. American Bridge Company. Channel-type Roof S l a b .... Lastek Products Company. Stair Treads and Platform P la te s ................................... American . A b rasiv e . , M etals Company. M iscellaneous Iro n .............. Railings ................................... Corrugated A sbestos ............ Steel S ash ............................... Empire City Iron Works. A. F. Jorss Iron Works. The Ruberoid Company. The W illiam Bayley Company. ELECTRICAL EQUIPMENT M ain Transform ers U nit No. 1 . . . . . . . . . . . . Two -- Westinghouse Electric Corporation 3-phase, 48,000/60,000 kva, voltages 69.000 w ye/18,800 delta. U n it No. 2 .......................... Two-- Allis Chalm ers M anufac turing Company 3-phase, 48,000/60,000 kva, volt ages 69,000 w ye/13,800 delta. Station Service Transform ers U n its 1 an d 2 .............. Two-- Allis Chalmers M anufac turing Company 3-phase, 6,000/7,500 kva voltage 13,800/2.300 delta connected to generator leads. ............................. One-- Allis-Ohalmers M anufac turing Company 3-phase, 6,000/7,500 kva, voltage 69.000 w ye/13,800 delta. ........................................................ One -- W estinghouse E lectric Corporation 3-phase, 6,000/7,500 kva, voltage 69,000 w ye/13,800 delta. .......................... .............................. T hree-- Moloney Company 3phase 750 kva, indoor, dry type voltage 2,300/460. 69 kv Oil Circuit B reakers. Fourteen -- General E lectric Company. 2,500,000 kva interrupting capacity. 13 k v Oil C ircuit B re a k e rs. Two-- G eneral E lectric Com- pany, 1,500,000 kva interrupting capacity. In su lato rs ................................. Locke Com pany; Ohio B rass Company. Power and Control C ables.. Okonite Company; Simplex _. . W ire & Cable Company. D istrib u tio n Cables ............ Okonite Co.; H abershaw Cable & W ire Go.; and General E lectric Company, 69000 . volts, gas-filled. 2300 V olts S w i t c h g e a r .,... I-T-E C ircuit B reak er Gom- pany. M ultimite indoor with 64 air circuit breakers, a An t t u 0;?00 kva in te rru p tin g capacity. 440 Volts Switchgear . . . . . W estinghouse Electric Corpora tion. Low voltage, m etal enclosed with 26 drawout RTM.M c.S?,r.c uamlt psb.re a k e r. type DK-25, 600 volts, 25,000 120/230 Volts S w itchgear.. W estinghouse Electric Corporation ; K alek Conffcany. Coalyard U nit ^Substation . . Allis Chalmers M anufacturing Electric Indicating Ihstru- B,,e ^laTMy st s ...................................... ............... tion. general Electric Company Westinghouse Electric Corpora- G enerator Voltage Regulation _ Type GFA-4. Fire Protective Equipm ent General Electric Company, fo r M ain T ransform ers. . Grinnell Company, Inc. Automatic, pneumatic, rate-of-rise actuated Mulsifyre (water spray) system.