Document 4vGBLDD5DJbEenor9QdwYaydR

TECHNICAL BRIEFS ENGINEERING DEVELOPMENTS HERE AND^ ABROAD DIGESTED FOR BUSY POWER MEN REVIEWED IN THIS ISSU.E FEEDWATER Soaw Practical Aipect* of Deionisation With loa-iitfiaog* Retloi STATION CONTROL, COSTS Emergency Central el System lead Steam-Station Cost Survey a U. ). A. STEAM EQUIPMENT Superheater Tube Failvrei Repairing the Blodes el Turbines " Directions for ordering, papen are ghtn on peg* 154* 26 o 26 100%' 24 9or.-- 500 M-too X 400 an-- 300 React Ive mvo 'ir. 200 as.6%' 6.30 8:35 6*40 645 8S0 Time, pm HOLDING FREQUENCY CONSTANT, load reduced by lowering voltage. About 68% system load wos lighting and 32% power 59.0 1142 11:44 " IU46 Time, om M:48. VOLTAGE HELD CONSTANT; frequency wos varied to reduce system lood, estimated os 39% lighting and 61 % miscellaneous ' FEEDWATER Some Practical Aspects or Deioniz ation, by Joseph Thompson & Francis X McGarvey, The Resinous Products & Chemical Co. Introduction of this paper states: "In the application of ionexchange resins to plant scale proc esses, h is essential that'the equipment be planned and operoted to utilne these materials to greatest advantage. Be cause of our close cooperation with en gineering organizations throughout the past seven years, many individual fac tors hove been brought to our atten tion which very morkedly affect good unit operotion and have, in some in stances, pointed the way for 'further Investigation on our part. Some of the Incidents to be related hereafter are based upon facts, so elementary in nature to those devoting much of their time to the ion-exchange process, that very often difficulty is encountered by the operating engineer by failing to call such points to his oMeniion." . Following (hit down-to-earth line of reasoning the authora point out the vari ous pitfalls that con upset the perform ance of an ion exchanger and explain how certain factors such as backwash ing, regeneration, bumping and leak age affect the over-all performance of on ion exchanger. Presented at the En gineers' Society of Western Pennsyl vania Eighth Annual Water Conference, Nov 1947. Copies available from The Resinous products & Chemical Co, 222 IP Washington Square, Philadelphia, Pa. STATION COSTS Emergency Control or System Load, By i M Comiy and J E McCormack, The Consolidated Edison Co of New York; G B Kelley and T IF Schroeder, United Light and Railway Service Co, Iowa; H W Phillips, Pennsylvania-New Jersey Interconnection, Philadelphia, Pa. The authors' aim in this joint paper is to point out some ol the po*- J;.. sible effects of attempting to reduce v, system lood by dropping frequency sndf>j voltage. ''V' Generally speaking, reduced It*' 1 quency results in slower operation of ^ rotating equipment and consequeallyj^ less work is done, diagram at righL Op.'Vi the other hand, o reduction In voli*| generally lowers lighting intensity cute other resistive-type power loads^ but has less effect on motor loads, d**'..Va gram at left. Field tests on a partfcuw^ syetem should be made before conc'u*: lions can be drawn. Experience shows voltage reducing, cuts reactive as well a* kilowail lo*<L\ while lowering the frequency mo* ..-.f, crease reactive lood ot time w y* reactive capacity and teal power are s , a limit. Use of voltage or frequency, reduction should not be consider a permanent-basis but only as a rn to meet unusual emergency condii'0 From tests made on the Pcnn*ylv,^> New Jersey Interconnection. ,l jr* 152 1802) POWER Okm*.' They measure heat to save millions for industry ACCURATI HEAT FLOW MEASUREMENTS are being made by this man to test (he thermal conductivity of pipe insulation. He can make read ing* within 14 of 1 degree F. at 800 different points on this ap paratus in the Johns-Manville Research Laboratory--the larg est, best equipped and most modern thermal testing labora tory in the world. THIS "HEAT-EYI" UNIT was developed in the Johns* Manville Laboratory to measure the thermal reflectivity of various insulating materials. Heat Bow, in ail its forms, has been carefully studied by Johns-Manville engineer* since the turn of the century. MAN-MADE WEATHER in this machine tests the ability of insulation jackets and casings to withstand exposure to sunshine, rain and freezing temperatures. The trend toward "outdoor** equipment in many Industries makes the findings of this research invaluable. Johns-Manville Research is the proving ground for industry's insulation requirements--a place where the economic value of insulating materials is determined with mathematical accuracy. From osbettos and other basic raw materials, Johns- Manville has developed a wide selection of industrial insulations. On the thermometer, they span the entire range from 40Q* F. below zero to 2800* P. above. On the job. they provide that right combination of physi cal and thermal properties so essential for proper application and maximum fuel savings. Forming a .link between you and Johns-Manville In sulation Research is a network of contracting firms specializing in the practical use of J-M Insulations, First, their insulation engineers choose the type and thickness of material best suited to your needs. Next* sfciffed mechanics in their employ assure efficient, economical application. For complete details and answers to your special insulation problems, write Johns-Manville, Box 290, New York 16, New York. v~Johns-Manville INSULATIONS Oatnmbor 1948