Document a1VV3eyJkvk7YxVzaGmexO0vM

The same. Only different. Elliott introduced the YR most dependable angle- single-stage steam turbine stage turbine you can buy. in 1947. It was an Imme But--we still haven't diate success, because it changed the bases that satisfied the needs of prac tically every single-stage made the YR a success in the first place. All Elliott turbine user at the time. YRs still share the same Since then, user require basic design and construc ments for single-stage tur tion. So you can take advan bines have changed. Dozens tage of the greatest possible of times. And Elliott has interchangeability of parts. improved the YR to And be assured of service meet them. continuity and depend For 1973. we've madea able operation. few more improvements. Write to us now for a copy Not to catch up. To stay of our latest bulletin on ahead. And so we can Keep the new, improved old YR on saying that the Elliott YR turbine. is the most up to date. Or call 412 527-2811. Pin'M 1947 Engines, turbines, generators Turbine helps fix itself Cutting tools and welding equipment mount on turbine runner to restore cavitation-damaged tube When Public Service Co of Indiana's hfaridand hydrostationsustainedheavy aviation damage oa three low-head Kaplan turbimes, repairs became oects- juj. Csviution in a hydraulic turbine is caused by cmaD air bobble* formed in (he Water the reduction in pte>* surethatoeeuain oonveatoo ofbead to velocity. The bubbles are suddenly farced to implode a pressure increases sgsin If they implode near a metal sur face, (be itres set op in the metal is high enough to fatigue the metal qukkly and break om metal particle*. Thiscan occur on tube* orblades. The utility! at suggestion of the ao- thcr*s company, deoried to by to speed repairs by aa assist from the turbine runner forpan ofthe work, oo the draft tube. Oo-arte inspection led to a deci sion that oinrii of the work on the sta tionary tube mold be ddne seminoto- oatically. This meant a machine boring epoation on the tube wall Although blade repairs would have to be dooe conventionally by hand-weld ing and hand-.WnUhing, overall down time seemed tifcdy to be reduced. Ifit could be rotatedat lowspeed, the turbine master would be a shady sup port for the nwwuij t.w.t;w^ bat this would be only the fim step. A special remcte-oootsolied drive umt had to be devised to revolve the turbine runnerThe controls fat the variable-speed drive plated near is. The drive sys tem included safety devices to Insure protection for the end thrust bearings. The drive system con trol also applied aad released the air brakes ofthe turbine, bypassing the tur bine's own air-brakeconsol A sotary-joim and e&p-riag arrange ment at (he ttmner bottom was neces sary to supply electric power and air to the platform f*y*n*i to the runner. Voltages were 440, 220 and 110 V ac. Ground leads were needed, too, to ground the wan area and prevent cur rent from through the thrust* StainJm steel, type 30S or 309, is the Cavttsflon en tube acafl deri) and on btadus 01^4)called tarwelddapoett Teal bolde* was rfeldly supported by rumor to permit accurate cut on wall Bypuan Goings, Engineering Systems of Indiana. Inc Uw.f4mi| IITS Tutuwed at end of osaebtatag stn showed oosAdarsbla Uapth or cavttaflan damage. HemaWng cratsrod areas were atr-oued and handwutdad bature another macMidng