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More TECHNICAL BRlS MbOVT "TEFLON" ------------------------------ iu&L* method of calibration involved * p| valve components of Du Pont "Teflon"* slderable number of Individual teip^l lure deflections m an tlty0<'p{j't^jfi p giving improved performance at less costsystem for E`,cn crank nglo.Tl'^fi average temperature deflection then w8 plotted against the temperature ts,fo]^i by the so-called sodium "0" Ife'ey^S venal method. 'Hie following concKi^ ........ j--* meions were advanced*. 8 (1) ImlivJduiil lemperaiure ''erVots -51 angle cycles may b phoiVy graphed. Thu makes it sible to study temperatumS variation from cycle to cye1e-< m: -rSflon" totrafluoroethylcne rosin has found illBj&ftny'uae n8 A material for valvo components-- ^gjftpaekings, scats and discs, plug valve parts Kf&phragms- It provides a unique combination of jgSftfea of particular interest to manufacturers and and to determine maximum'.#) IS^Vlves. and minimum peak cycle Un&jl peroturcs. '^jH ^CHEMICAL INERTNESS. "Teflon" is com- Escosiive wintei king condUion from on osiiling tewor of onothir mokr led to the design and installation of this United Cooling Tower. Built for on leva public utility, it feo- (2) As evidenced by performance^! on different fuels, the rtsulij^ were free of the effects ofX$ chcmi-luminescence. ny** (3) Because the method reports lo-l`* dividual cycles, overage cyltno,.* der lemperaturei must be deT*jS| termined from a great number$tf* of rondomly aelected cycles. SW* (4) As - this is not a primarj'jSi method, ihe calibration raust?J Ki^fotely unaffected by acids, alkalis, W^ftliphotics, aromatics, chlorinated hydro* BtftarbonB... all chemicals oxccpt molten fr'f'alkali metals and fluorino at elevated ^^temperaturoe. RftHIAT RESISTANCE. Givoa continuous aorvJs^iios up to 600F. P'S-IOW-TIMPIRATURB TOUGHNESS. Has l^ been used as low as --460F. VA1VI OfAPMRAGMS demonstrate the chemical inertness and thermal stability of Du Pont "Teflon." This diaphragm of puro "Toflon," abovo, was designed for continuous operating proa, aurea of 100 psi and tomperaturea of 400*F. Tho valvo ia made by Uilis-McCanna Co., Chicago. W rlaw W twnr at tap, thtvhp ate littaka , TNl I* on iionplt of how United designs to sol** four indifiduoi wottr cooling profc lures a hooted air fafoite, utilising (tot water distributed through spray nonles into the incoming oir. lesolf.--more moisture absorption, mini* mum drill, voter less and heeling. iors . . . without rigid standardisation . . . is. Write ut far defelfi. be undertaken with great eare^l Allowance must be made forltj vuriation of emissivity, for theV''& geometry of the optical system, and for the concentration of th,'.i alkaline soil. ASME Papen No. 53-S-4A. pitow cocrrieiiwr op friction. Lets the &*VvaWe operate easily. Requires no ^r-luhricution. *?# EROSION RESISTANCE. Resists erosion by jjp,"impinging fluids. %i with components of Du Pont "Teflon" ore OAfXfTB AND DAM* INOB of "Teflon" ofton outlast the valve itself. Avail* ablo in many forms for varied valvo uses. Du Pont "Toflon" resista corrosive attack, United Towers for Air Conditioning A good cooling tower Is the best protec tion for o pood oir conditioning system. Oltottbot tor orOvrfnp popsrI 00 p IS) Economic and Design Considerations fe?j large Power Plant Stocks. By H L soft ;p<Kiefly uteful lo manufacturers of; chomicals, ferjl&em, petroleum, soap, chlorine, foods, plastics, (njar;,(lyes, insecticides, rubber, textiles, explosives, jjttper,' pharmaceuticals, photographic film. insures a tight seal. Pictured iso cheml* cal porcelain valve rendo by the Lapp insulator Co., Inc., The United tower en tho left, 0 1600 Hohenieiten and R H Kent, Contolij* LeRoy, N. Y. G P.M. low hood tower with sprinkler dis tribution, serves the air conditioning eyifem of a southwestern roilrood ifetion. United also builds redwood filled, me chanical draft stool towers, J to 15 tons, end pochoge type redwood spray towers, 3 to 30 tons. UNITED COOLING TOWER COMPANY dated Gas Electric Light and Power Cs/Ij With the range of fuels, the amount^ of excess air, allowance for air leakage.) estimates of gas temperature and the; maximum cfm ef flue gas per boiler termined, we atart out by msking en^ estimate of the approximate stick di\j menilons. Until recently, the stock diameter **? j*J|}eiPolychemlcoU Department of the Du Pont Cempany supplies "Toflon" in the forms of molding powders and aqueous dispersions. Theso forms are aourted into various valve components and molded by a number of manufacturers for use in L'tomca) end allied equipment. For further informs* jymfjwrite: E. I. du Pont do Nemours & Co. (Inc.), }&!lhemicala Department, Room 261J, Du Pont 4022 Broadway, Koniot City 2, Mo. Plant! Pilot Paint, Torai chosen to give a minimum praeticalfi] IMf'/Wllmlngton 98, Delaware. fit Author-lied Representative! In Principal Cities friction loss. In many cases (his resuM vt in a stack velocity of the order ef 50^ erdiy- fps. With the necessity for higher sndl higher stacks in order to achieve propel/ dispersion of the combustion products^ ft. I UNITED the designer will find that friction lo**i is no longer the proper criterion (or Jcciion of the optimum diameter. To frik reasonable relations between stack di*] COOLING TOWERS / no ameter and height for structural conaid-j erstions, he will have to choose a mueb.f larger diameter which, in turn, will f*'#} ducc materially the flue gas vclockTj* through the stack barrel. To provid*the necessary emission velocity, notxl^ may be introduced at top of stack. POWER NOVEMBER Polychemicals ;DEPARTMENT * ' PLASTICS CHEMICALS NOVEMBER 1953 PlUO VALVI COMPONENTS (slcovca and cock waehera) utilize the low coefficient of friction and non-odheaive characteristics of "Teflon." TTiey prevent sticking or freezing in tho valvo body, often simplify design, give oxoeltent results. Tho valvo above is made by The Duriron Co., (no., Dayton, 0. H7