Document 3Q0x5QYRX2wxeQ5B8XYkrJoja

^aWCOPPER Alloy Bulletin w,f*'<ipWw ___________________________________________ :_____ ______________________ 'V' MARINE AND POWER EDITION ggpOUTWa NEWS AND TECHNICAL DEVELOPMENTS OP COPPER AND COPPER.BASE ALLOYS. Prepared by Bridgeport Brat* Company Headquarters for BRASS. BRONZE, and COPPER can be a reality ... if you logically consider the problem. Too few dollars can easily buy disappointing efficiency while it Is fust as possible to over invest with the same result. That's where the Buell von Tongeren Cyclone comes in. With o patented u$have-Off" to overcome the "double eddy" evil, it can be big enough to overcome' plugging hazards. Individually engineered for each specific application Buell is in a class apart in achieving high fractional efficiencies. There's convincing data in the 1948 Buell catalog. Write tot BUELL ENGINEERING COMPANY, 10 Cedar Street, New York 5, N. Y. See our exhibit o> the tfith National exposition of Power and Mecfcarucof Engineering Greed Central Pokrce, New York Nor. it to Dee. 4, BOOTH No. 77 Engineered EMI.Ienc, In jjyjj COLLECTION ISO (726o) fCondenser Tube Problems toon absorbed through longer service life, fewer shut-downs, leu frequent re-tubihg, etc. However a certain amount of cleaning Is absolutely necessary. at Consolidated Edison Today's units, with modem high pres 1 sure boilers and Improved turbines, ere Lubricator Valve MH. Haw da tho largo power plents sotva , ibtir many condenser tube problems? i gngimera of Consolidated Edison, New > Ytek, kindly consented to bo interviewed ' n the Coppor Alloy Bulletin and sup- 2sd some interesting facta. Known as thi CcuKNxn UrcticiTQK, itti' Wator Conditions Poorer' device dispenses aU lubricants .'from iljfcj . ff{. Continued increased pollution from oils to heavy peases ibroojb the am ' L-J awt|B end industrial wastes has made tohe wfehoat change. ' The through-fl** >v the waters in New York harbor more and 'valve has so pockets or crericci to rctud.>i| mere corrosive to condenser tubes. Con- lubrication flow. Valve U. complete b-|; jv closed to prevent leakage ood to eliaioua possibilitr of contamination of labriciaisi * from outside sources. Lubricator Is installed dlreetlr late bear* 'j log and does not require special gaai is - :7 Introduce lubricant into the system. LdW1'. Tsalidsted Edison has, for a number of .. ` |ers, msda o practice of trying out now f/.illoys and changing to better, more corr>> mion-rotisting ones as they ere developed , by the brer* industry. ; About twenty-five yoors ago, Admiralty !' vis the best available alloy end Consoli` gstsd Edison standardLied on it eator functions either with hand-operated When Aluminum Bren was developed guas or Irom a coarplelelj iirtomttje eet-v n England about eighteen years ego, to operate at any desired Interval. SulliUs CosioUdatod Edison tried It out and for ose with road machinery, mining equip'''., .1 - found it to b superior to Admiralty in meat, machine tools and other prodseties'.' t \] ' misting inlet end impingement corro- machinery, this lubricator handles op t*'M '.``i don. A few years later this alloy wet 500 bearings or more in leas lbs* cor j| minute, while machine U in epeniiia.Hi > (applied by domestic brass mills. For most of the Consolidated Edison plants Aluminum Brats has replaced Admiralty Titeflex, Inc, 595 Frellnghu/ien ArwVaff/ ad lasts considerably longer. Newark 5, fl. J. E/ Dovolnpmonl oJ Although the merits of Aluminum Bionae had been known for many yean, only experimental quantities had been produced because el tho difficulties en countered in manufacture. However, through special catting techniques and the use of new and more powerful mill equipment, Bridgeport introduced Duronxe IV0, (Arsenical Aluminum Bronte) In 1938 es a standard alloy. Advanfogoa of Sorvicg Tests Consolidated hat learned that the most practical way of finding out whether e certain alloy it-aatisfactory Is to Lnstell a number of tubes in certain pieces in the condenser which give the most trouble. Careful records era kept of their service life under actual operating conditions. Naturally It costs money to maintain such tests but they more than pay for them selves In voluable knowledge acquired. It is not necessary to make a largo invest ment'in tubing to try out a new alloy since only a limited number will suffice. Consolidoted Edison has also tested other ottoya. Red Brats (85% Copper, 15% Zinc) gave an unsatisfactory performance, as it stood up for only about tlx months. Cupro Nickel (70% Copper, 30% Nickel), which gives an outstanding performance for fast ocean-going ships, wot not entirety much more efficient than the'older de signs. Consequently the tendency is to opereto the newer units on t continuous basisi The older ones ere used for peek loods and os standbys and generally oper ate lor about ten hours a day, being idle the rest of the tiroo. Since uninterrupted eervice of tbe most modem units leads to greatest economy, every effort is medo to keep tKora in oper ation. About once e dey chlorine com pounds ere Introduced in the circulating water for e short period to prevent or re move slime deposits which interfere with heat transfer. When It Is necessary to hut down those units for maintenance the condenser Is cleaned manually. Consolidated Edison has found from long experience that keeping the con denser tubes as clean as possible prolongs their service life. However, they still have the problem of impingement corrosion which takes ploce at the Inlet ends of the tubes. It is true that Aluminum Bronxa withstands tide attack .better then the other alloys. However, protection can be obtained by painting the inlet ends of the tubes end the tube sheet with a special paint. Unfortunately, this method is time consuming since the paint hot to bo ap plied very carefully and evenly. It also has to be dried for e number of hours be Alunslnum Brottxo As esrty as 1913 Consolidated Edison y ** Intsrestsd in trying out Aluminum 7. Brenix (95% Copper, 5% Aluminum). satisfactory under existing polluted harbor water conditions. - Tho High Cost ol Moiatonaneo With greatly increased tabor costs, fore using. Since shut-down time is vary expensive, other methods of reducing Inlet Ond corrosion ere also being tried such as Inserts which ere secured In the tuba. .J* 'tsperimental Installation of about overy effort Is made to keep maintenance Conditions Vary h*bei was mode at that time in their Creek plant then operated by b umted Electric Light and Power Com- down to a minimum. Experience has shown, first of all, that It is most economi cal to use the best alloys available regard Experience of a successful power com pany such es Consolidated Edison can be Pny. These tubes were romoved in 1933 - e period of 20 yeare, less of the higher initial costs, which are helpful to other power plants interested In efficient and economical operation, "though their useful had not been ox- Bridgeport recognises that each . pbwer plant hot Its own problems as to water ; hsutted. Compare this conditions end operation of the turbinea ! [*TMd with Admiralty end condensers. An alloy which proves v- u!leh *" *d In ad- successful In one location may ba unsatis K Re,nt condensers of factory in another. Por this reason Bridge * design and mDIbioI-Electric Plant! Mom 20SDSP 2S00.watt die*l-e)(ctri.<j ' -*w ` rstublng. a- *"">!>- int lot ol plant ia powered by an air-cooled linglw-y cylinder deyefe engine, dutomaila ., preuion release makes possible tk&ri* j | starting. Plant has Inherently refuUw',^, j generator that providea good voltage Bdlran at Hud2L*"- ln l8M W B,o.cd it. --P--tartly ova. aluml- port will be glad to'cooperate with engi neers by suggesting alloys to bo tried out end by discussing the faults of tats made under actual operating conditions. Bridgeport's Corrosion Laboratory carries on e consistent program of corro sion research with the objective of under standing the properties of available elloys, improving existing alloys end developing new and better oees. Mueh information lotion without use of rheostats or other\ external equipment. All engine *td-lgayi>*!j erator controls are conveniently loested -*<th.pta.B *Aluminum Sy- '> "oi o( ih. on ths properties of available condenser tube alloys is.given lo Bridgeport's Cot>denser Tube Manuel. Contact the nearest the steel bote. Available in 60^7*1* *VfV'`j models for US or 230 v, single-phM#! 41e*and is now * Mmri ,Uoy, 101,000 (Outre feel Wattbingten surface wrfww Unit No 7.. Capacity 100,000 O-P.N. end 1,590,000 tbs. pn hr. condensate. Bridgeport District for condenser tube service. -u. a. r*tr*i n>, itutu 115/230 v, single-phase fl-wire; of ByJwS 3-phato 3-wire. Standard equip*8*/?* eludes two heavy.duly 6-v aMrtJxf W'J teries ia series, oil Alter, oil-h<A "J. Bridgeport brass hOIPOtf 3*455 COJH3ANT, *ID0|?OT 7, CONN. tSTABlttHiO t Milh at Bridgeport. Conrwttlcut, exd (ndionopofil, fodlens In Cenadei Nerande Copper end Ireu limited, Menlrsef POWSI '7J November 1948