Document 5DOmOab4bxQzgJrpvaqYQba98

SOUTHWARK STATIOH HOW HOUSES two units representing Each (tack serves one 8S0,000-ib*per-hr boiler c SoIf of the projected ultlmoto development of 600,000 kw. 925 pig, 900 f. Coot unlooding capacity equals ; condensate pumps and 1-p feed pumps. Pressure developed delivers the feed water through the drain cooler and all heaters to the suction of the h-p feed pump without danger of flashing. The two rows of heaters of each unit have connections between them only at the ends, with no valves between healers in either row. During trouble in either line of Hesters, the whole faulty line I# taken out of service by closing the valves ot both ends. With only one line of heaters in service o maximum load of about 130,000 kw can be carried on the unit. Valving in the ring loop at the h-p feed pump discharge insures water supply to el least one side of each boiler should trouble develop with any pump or the piping. Steam Piping System. Main-steam- system valving allows isolating either boiler, the main unit or the house tur* Use of House Turbines Marks Design of Philadelphia's Southwark Station This plant features largest main turbines to be currently in and construction started in 1941. 6a cause of the war, it was stopped ia the stalled, They are arranged an unit system with two boilers summer of 1942 and not resumed o per turbine, low-pressure boiler feed pump partly raises feed the fall of 1944. In establishing unit capacity, ISOjOOO pressure before it flows through all heaters at constant head kw was chosen as it was felt that s up to that of the existing 165A!)Mv machine at Richmond Station wen Bp A ft PETTIT and f W MYEftS, Philadelphia f/octri* Co reasonable with a company InitiDaf capacity of over 1,200,000 kw tod interconnected regional system capsdjT % The Southwark Station of the Phil* adelphia Electric Co, in the south- rpm. Generator# are totally-enclosed hydrogen-cooled single-winding ma of about 5.000,000 kw. The 150,000' units made it possible to provide tlx most generating capacity in the inO east section of Philadelphia on the Delaware River (2501 South Delaware Ave), ho# recently been placed in op eration. The tile, ultimately accommo dating four 150,000-kw condensing tur bine-generator#, hat at present only two chines with direct-connected main and able space. pilot exciters. Generation takes place Hmii Turbinas. An independent at 13,800 v, 3 phases, and 60 cycles iliary turbine-generator for each Btfh with a 250-v field. unit will normally supply power f The cross-compound double-flow ma main station auxiliaries. This will f chine was selected after a study showed vide maximum reliability for auxilivT units. No. 1 went Into commercial operation on August 1, 1947, No. 2 will be starting about now. it to have tho lowest beat rate and the lowest price except for o single-casing machine. power by having its source free fn* outside system disturbances. Allis-Chalmers units ere 12,500 kw, Moin Units. WettlnghouM croia-oom- Throttle steam condition of 850 pslg, 3600 rpm, noncondeosing steam turbto* pound double-flow machines are rated 900 F was selected after cost com driving 0.8-pf air-cooled generators at 150,000 kw at 0.8 pf with a 65,000kw h-p element and a 85,000-kw 1-p element. The h-p ilngle-flow 19-ctage turbine turns at 3600 rpm, the 1-p double-flow 22-stage turbine at 1800 parisons with 850 pslg--925 F, and 1250 pslg---925 F showed that operat ing cost ssvingi would not be large enough to Justify the additional invest ments. These studies were made in 1940 main and pilot exciters. The flow turbine has one impulse *t*g# 29 reaction stages and operates main steam conditions of 850 pslf 900 F at the turbine throttle. [ ii^t System. This arrangement was | chosen lor (1) simplicity by omitting r rim between units, and (2) reliability i by keeping the difficulties of one unit |: iulsted from the others and the etimr nstioo of many valves. Unit parts comP pletely separated from the others are | oshi turbine, house turbine, feedwater G systems, main steam systems, sootI bbwer systems, drip systems, draft ays- $' ifipy, dust-collector systems, slacks, i icoerator cooling-water systems and L chenUtinf-water systems between river Er and condenser. | Htet BoloMa. Diagram below shows E: the best balance for a station net out s' put of about 150,000 kw, the most effi* debt load. The scheme makes best use | f bleed steam as set by turbine design R* to# producing feedwater temperatures | raitabla for the boiler design. The oux illary turbine exhaust discharges Into 1. (IFmain unit second feedwater heater i. aad bleed point (2) auxiliary conden- P *r.ud (3) auxiliary deaerator. Nor|. oaDy, with the main unit operating, the ftv nKiust passes to the second heater */ bind lines where U furnishes these If* heiter demands and discharge# the exSr *s> into the main unit turbine after P` *l*`5th stage of the low-pressure ele- |Si-' ?*w' ^Q(luc^on valves protect this It bleed point against steam flow from the ``PHlary unit after the main unit has |1. Wpped out. It fadveter System. There are three IK. *"***te pumps, three 1-p feed pumps * three b-p feed pumps. Two of each t *** * nits are needed for operation III' "** *4*ltnum load. From the con[fc/0* condensate flows through the MAIN PIPING DIAGRAM FOft ONE UMIT shows obsence ol ties with other unit. Porotlel feedwotcr circuits through heoters eon be shut off only ot feed pumps AUXILIARY TURBINE EXHAUST DISCHARGES to both No. 2 hooter ond Into the moln turbine ot 19.8 ptio, Note the location ol t-p ond h-p boiler feed pumps 64 (134) POWER M* March 1948. (I35| 69