Document RJpaeE7o2dJoa75LzB2n61yrE

More TECHNICAL BRIEFS Thi reduced die perolure. by proriding 'rau"ck,'"1r tjft (orm ventilnlion Ilian had viously obtained. ^en r** When Iheio Improved remi|lti,, JV: nlquee .were combined win, , legee of high proasure hydro... cooling medium, ihe met ingle factor in both the .Into, temperature rine became the thj^c i drop through the inlulatlon. I., "^',! as no aubatantlal improvement In * thermal conductivity of insulation foreseen, the next logical step was th ree! ventilation of the winding conoeri within the insulation. This wii ceasfully accomplished with the Intro.' duction of supercharged cooling in 1951' The application of supercharged hy drogen cooling to high speed generators has added enormously to the economi.' cal utilisation of raw materials in theift manufacture. Fig 2. It conserves power plont space and affords the mer other important economies in foundation! switchgear and bus structure supports. Because of its -favorable operation at elevated pressures, the supercharged machine is especially cool at its over load ratings. Its higher saturation proves its steady state stability andlu shorter length makes accurate baling ing easy and differential eipansion'fi'r less serious. 3. The compressor lias no wetting parts is of heavy plate steel construction sad requires no attention whatever. Bear' ings and seals are smaller, requiring leas oil and less maintenance. .And die quantity of gao required to fill the ma chine is greatly reduced. APC Paper, no number. v-J fr. Oporallng Eaparianco with Lorpo Otrv orating Units. By P Lioertide, Philddtl Trouble-Free mi: J-i WMBiim WwMitm phia Electric Co. <f\ Our experience has shown that Uu availability of the large turbo-gcaert- tors is, (or all practical purposes, sentially the same as for small uoitk An examination of the records on. lHh *1 Sihromin', alts. . . kl-ior;r'al*'f tooled .i { " .I 0 mpt 11 or t' , jr * equipped 'w.llh - ," 'lvy.o0 Cioilmingr'CCooon.- ,-1u; ^i j1l . *>.Shh,. no.ieeiiournaamneendft-. . a' ;i ' '(l -MM . I subject revealed that for seven low-prej sure 30,000 kw units covering forty** turbine years, the availability was P: proximotely 95.0 per cent. Correjpoftdingly, for our four Jorge units compofcd 01.'"the flmVdt rji I of three 182,000 kw and one 165.000]k? bt lotw'cct^r'tMOWK y i covering twenty-three turbine years, t ''V aata'iolcl b;,lhel.'l5i^ Jy'.t availability was 93.6 per cent. ,*< ' |V*utorida to luund'lei'i The 165,000 kw machine at Kichtnona, ! ` ^^Af V 1/1 /I Stotion, grand-daddy of large units,..;., tooliro !<oniroti.IwT.f.' now been In service for ciightcen^ This machine was originally lin'd . j 135,000 except through on emergen*!! Dli0vars; , luVVo tlreinc't P`- & yP. - ffy. Tfi'n.'jaVguluiur.. DtVurrawt, In rtfir/tg po9*'t 60 * :* Cooling Controls Endorsed by Equipment Manufacturers Sarco dependable, self-opcrated temperature regu lators with reverse acting valves regulate the flow of cooling water to air compressors, still condensers and heat exchangers in various industries. Because of the low cost, sturdy construction and trouble-free operation of these liquid expansion instru ments, many original equipment manufacturers sell their machines "Sarco equipped." This adds a valuable selling point, lifting (heir products out of the commonplace. Sarco cooling controls, designed to meet the specifi cations of such equipment manufacturers may now be had by individual users at prices possible only because of this quantity production. Sarco rigid stem cooling controls are now factoryinstalled by many manufacturers of stationary air com pressors, solvent recovery stills, condensers, injection . molding machines, hydraulic testing equipment, de greasers, lime slakers and many other types of equipment. Write for Bulletin No. 7oO-l4 for complete infor* motion. No obligation, of course! Sarco Company, Inc., Umpire State Blog., New York 1, N. Y. Represented in principal cities. Sarco Canada Ltd., Toronto 8, Ontario. improves product quality ond output POWi, WNE '?S J M: .ssT-;