Document a1DRqqkeeOpBVoL9N4Nz7jyKB

RVI N N AT I P0W TS More TECHNICAL BRIEFS years. Fig. 2. The author discusses their use and limitations. The most recent (both about 15 yra old) are the ``controlled scale depositionM method band on the LangHer Sat* urollon Index and the "threshhold treatment" employing a glassy phos* phate. The Langller system depends on es tablishing o thin but dense coaling ol calcium carbonate to protect metal sur faces against corrosion but not cut down loo greatly on heat transfer. But be cause there are wide variations of water temperature within a single cooling sys tem, the job of laying down the most desirable uniform layer is often compli cated. The glassy phosphate method is held to be simpler in application. It must be remembered, however, that there is a definite limit to the ampunt of hardness you can stabilize with glossy phosphates, and supplementary treatment methods are often in order. E5IFP Paper. No number. A Review of Testing Techniques in Cool ing Towers. By J K Rice, Cyrus IVm Rice & Co. Testing procedures for determining the effectiveness of cooling water treat ment may be classified as: (l) coupon (2) sample unit (3) full scale. Any one of these procedures may be used singly or in conjunction with one or both of the other two depending on completeness of desired information. Coupon procedures are the most fa miliar. They are the ones in which a relatively small sample of the material is subjected to a given environment for testing purposes. Results, though, can not be token as relative to results in actual full scale operation unless and until a direct correlation Is obtained in each particular environment. A sample unit Is a small portion of a full scale system wherein the samplo Is dimensionally similar and subjected to the identical'environment of the full scale unit. As an example, the sample unit might be a section of pipe, tubing, valve or fitting. Chief disadvantages are cost of sample, job of removing and inserting them in the full' scale en vironment, and cost of operating them. Full scale unit procedures are the final, Bnd for a given environment, the only aecurale procedures. The measure ments you take with a full scale unit are operating data, costa, hours be tween cleanouts, oosl of cleanouts, tube life, changes in water side heat trans fer. ESPP Paper. No number. Water Treatment Deionisation vs Evaporation of Hard Water Suppllee Per Boiler Makeup. By T C Nappe and R A Russell, Black & Yeatch Co. The authors feel that the subject ol deionization of waters with less than 150 ppm of dissolved solids has been widely discussed and its advantages well known. There is, though, a scarcity of data on delonizAtion of waters ol 500 ppm of total dissolved solids ami above. Makeup water of acceptable quality for the higher ranges of boiler operat ing pressures can be produced hy evap orators or compression distillation. For the lower ranges-the choice may be hot lime-soda, hot lime-phosphate, hot or cold lime-zeolite. Deionization, though, is available to both. Economic consid erations, then, are frequently the de ciding faeior. Proper selection of the' pre-treatment process, as well, can re sult in'reduced operating costs for the boiler makeup water conditioning equip ment. The authors set down the following analysis of the evaporator end the deionization methods. The evaporator has these advantages: the method is a conventional one, well understood by plant operators and boiler water consultants; operating TO OBTAIN COMPLETE TEXT Material far these abstracts cornea from the following sources unless otherwise staled. Order complete paper from source, not Powcn. Engineers Society of I?estern Pennsylvania, annual meeting, Pm Penn Hotel, Pittsburgh, Pa, Oct 20-22, 1952, identified by ini tials ESPP. Obtainable through H M Porter, sec. ESPP, Hotel Pm Penn, Pittsburgh, Pa. American Society of Mechani cal Enginters, Industrial Instru ment and Regulator Division, Seventh National Instrument Con ference, Cleveland, Ohio, Sept 9-10, 1952. Identified by initials IIRD and ASME, Fall meeting held in conjunction with Centen nial of Engineering, Chicago, HI. Sept 9-10,1952. Available through ASME, 29 W 39th St, New York 18, N. Y. costs are independent of varla:ioatj water analysis and chemical PROFITABLE POWER space requirement ere small since" chemical storage is needed. On opposite side of the ledger as diiO vantages ore: rate of makeup proj^ tion frequently depends on plant *FJ_ irieal load, the equipment can't be In advance of plant start-up; T bicarbonate makeup the evaporator!)* 1 from WOOD REFUSE por carries off COa which requirtfl deaerator for reduction; periodic crtL ing and scale removol are needed^] best operation unless makeup U-pb treated; if ammonia Is present li U]j^ properly removed. Deionization has these advsntsgei!j| serves as a sourco of high quality vtii for starl-up and refilling boiler t(j9 scheduled outages; operation is IiSFpendent of electrical produciion ondftL produce high quality water at tilA rates to satisfy any unusual deauijK that may develop; makeup quiljfl stays consistently better ihsn vinT evaporators; equipment can be puijtJ any place in the plant with piping et}] nectlons few and simple. In the deionization disadvantage tyl umn the authors state: It requin] periodic shutdown for regeneration with FAIRFIELD handling systems exchange resins and close attention the operator during regeneration; pij ncnd additionel storage apace for che| , 'i', Economical power from wood waste hoe become a reality for many wood produeta industries who have icala. worked with Falrfiotd Engineering to develop proper The authors sum up their story wifi -.wood refuse handling systems to feed boilers. the expression that the trend seemih be to greater use of deionizstl*] i.`Illustrated hero are scenes of such an installation ESPP Paper. No number. profitably at work for a large southern Kraft pulp ^ and paper mill. The Fairfield system consists of a Experiences with Chloride Anion fj| t r- series of belt conveyors which transport bark from the debarking mill; through b&rk hogs and up to the top changers for Reducing Alkalinity. of the boiler house where It is stored in a Fairfield S B Applebaum, Cochrane Corp. [p;--., "live-bottom" bin. The bottom of the bin contains a You can reduce alkalinity by oae.. f.series of screw conveyors which properly feed the bark three standard methods: lime with tj* ;to stokers directly below tha bin. Plant officials say h iwott ov*r cWoilnd pIMroUcVeSsMs;, swuiilifuuiriwic aocwidn Ray*|-- .,UthMat tUhWo perifOorimmuannCce oOfl tUhIi1s8 Froamirfrieeilud s..y..s...t.e...m......h..as been lowed by aeration or deaeration;-^1^. ^ery satlsfdctory and has lived up to all expec On. oil*. mor .ncM.d f.WWd CeovoyaM berk into the "Mvo-boltom" bin *>P ,h* ** drogen zeolite, again followed by scniB|* Lion, each deaeration and repumping. of these methods carry with B<{1\ lh| ` Investigate this potential power from your wood waato .'now--an engineering treatise on wood waste systems and a eopy of Bulletin 862 is available, write us today. certain distinct drawbacks where ara*ik[ plonts arc concerned. The author,' h*t| ever, describes an answer to these jectjves involving use of a relatival new method of alkalinity control means of the chloride anion. Thera are five -major advantage* FAIRFIELD the author sees it: (I) No acid needed at all. (2) No acid-proof lift*?! shells, piping and valves are requir^L^ (3) Salt 1. employe') and 1, rafljjK, FAIRFIELD available nt low cost. (4) Aeration _ eliminated for COa removal. (5) Rt| pumping is avoided because chlorf^, (Continued on page 188) ENGINEERING COMPANY 333 chkogo A*#*** MARION, OHIO Set** <*'<*< bJft Mo boHoo of the foMaM *`lf*o-boMo" bin food the berk Into ko riokort. 1ST READER SERVICE SECTION fe. i