Document B86B6Ov1kYja4w1qbz5ErqvXX

The tremendous power developed by the new ROTOJET enobles it to clean tubes at unbclicvablcipecd. On one recent job, a ROTOJET Model SOS cleaned badly scaled 2" boiler tubes ot tho rote of 5 minutes per tube in one pass, while ordinary tube cleaners required two passes and 20 minutes. The time and lobor soved on this one job alone, more than paid for the ROTOJET. New ROTOJET models for operation with air, water or steam are. stocked for most tube sizes. Send for new bulletin. ROTOJET /iit-diUveit TUBE CLEANERS Af Air Voht fai carrn) fub* liMMd- Rota Air Valve Saves Labor By installing on inexpensive Roto Air Valve directly behind the motor, tube cleaning becomes a one-man job, eliminating a helper and speed ing up the cleaning. Mode for all straight and curved air-driven tube. cleaners. ELllOTTCOiVIPANY-ROTO DIVISION 153 Sussex Avenue Newark 1, N. J. .econdnry .olloje of (rid trin.fjfijg A phase-shift network, Fig. 7, derH mines phase angle ol voltage im'prv--* on grid translormer. ; Electronic regulators act on d*e9 citation of a saturable reictor.'fflf standard voltage, which Is the'dnSv across a speed-setting potentiometers! compared to speed signal from tilj&H meter generator. Differentia) 'olliefl a then fed into an amplifier, wfcjgS . passes current through dc poi) of &f able reactor. This regulates Gnjft angle of thyrairons ond maintaining! sired speed. Current-limit eonUol'&fij be superimposed by feeding drop motor and generator commutstirfnj 'fields into amplifier. Applicotions. 'Industrial drives iSsvea successfully used both ampfidyheffijl thyratron exciter systems. As farYSfl performance is concerned, they'-unP equivalent. Choice of one or other, tern is largely governed by requlremwtf of drive, size of rotating maebmP range and accuracy of required ip. control. A detailed study of a pahfbK lar application should be made to deterS mine which system is more economical? Talleyrand Condenser! (Continued from page 81) '<v Through the efforts of the TslicTrEdL Engineering Laboratory detailed plsSB were completed Nov 20, 1947 to repl*< the hydraulic control features (!;{-- chlorinator with a simple sir-operstadj set designed to eliminate many festorejf of water-operated control. Foulinifofl ports and passages along with ccmsicSJ oi important parts was inherent Ww water controls. * Air operation tfop&| fies design, reduces the number of.wjjH trols giving smooth, reliable operiljjjw with an increased safety factor, Corrosion RodueHon. ChIorin>d@| also leads to reducing condenie/^jS corrosion. When porous deposits, .MJ4 as hilt of decomposing wood, paper, fish, algae growths or products, are in contact with a j$jg formty filmed surface of tubing, beneath the deposit may break doWMj and permit highly localized corranffij The extreme variation in ail concerning condensers often time limit on the value of tolutle?^! given problems. Records ol connWWRfl operating and maintenance facts be kept in detail to enable any situation with an informed stu -.Jb At Talleyrand we started this 25 years ago with profitable resul Acknowledgments. Tho autho AOWIA Novowbof^g With the Llunestrom Air Preheater, it is practical to teach low exit-gas temperatures. , While plans tor stearn generalion plants jmr under consideration. Investigate the possibilities oi the Ljungstrom. The speciolircd experience of Air Preheater engineers >5 ot your disposal, to aid in effecting the most economic heat recovery from flue gases.