Document r7737jzXxM5aVx7aonjV4ajq

^DllNG EQU"'f/vr tome four feet from ilie shell and eater by way of a reversed swing so torqu in'tlte horizontal pijw can absorbdii sionaf changes in exchanger itgli length. V- Ute of flange joints im the water' cuit and slip joints on the oil ]$'ds permits a shell to be withdrawn ffen service in a minimum of lime by looSea- mg only a few bolts. This work dot*'aft disturb the main control valves and'. second section of the beat cachin' installation, permitting operation^ continue during maintenance work! Elton Sterrett Houston, Tutu SLIP JOINTS PREVENT EXPANSION TROUBLES Heat exchangers must be mounted flexibly to expansion of the unit will not crsmp or distort connections and fitting* for either circuit passing through the shell. On the crude-oil pipeline, right, the flow of oil through the line cools the engine jacket-cooling water. Here the heat exchanger shells are mounted with slip joints on the downslreom end.' Three sets of restraining links set across' the slip joint take any end thrust that develops and prevents the line pressure from forcing the^unil apart. The links are set up when the unit is cold, thus allowing for expansion above that (mini without binding. The lines carrying the eooting water (A the coils within the exchanger are jet Tbe Editors invite Contnbnton^ Here's your chance to caih Id^ on one of those profesiioasl'i tricks yoo have used in yom plant. I'pwn payi |M for etch { item pabllihed her on prob.'jj lems in design, operation and^f maintenance. Your contriboiioaif need lie in rough form only-^ Jni set down nil fact* wfif3 ikelchsi in pencif. We will dag any editing that is needed. -1 AUTOMATIC SWITCH CONTROLS ALARM CIRCUIT I'Cot'Oa avs/np 00O i(e* ptato 1)4 (643) Cot-off Oosftfoff end t/c* ` pfoft A plant burning hogged fuel moved its wood from the storage vault by a belt conveyor. Frequently the wood would arch over at the vault discharge leaving the conveyor empty. Since this fuel fed three boilers it was important that the fireman know about the stoppage as soon as it occurred. The author de veloped the meehenical switch, at left, to operate a bell alarm. A swinging gate in tbe conveyor trough operates this switch. With a clean belt the gate hangs vertically, bui when loaded with fuel ihe belt pushes the gate to a horizontal position. The gate shaft extends through the switchmounting plate. Two brass bushings mounted on the end of the shaft ere locked In position with setscrews. Each bushing carries a kick plate and cu readily positioned in respect to tha*fd and theJgate, and adjust the al*rtj$ on and euf-o/7 points. The spring gives the switch action and locks it In position.4'% gate can swing to ond fro s eerj*! amount before causing an either direction. The sprml^PJ^ construction of the moving wjji-t points ouures a good contact switch closes. The angular arrsaifi?! causes a wiping action th points. The awltch raijr b either a circuit-opening or cit ing setup, depending on the the alarm circuit selected. ` Dehard L Gusler (Continued on pot* 136) ` POWER 0c^ PROBLEMS SOLVED at . MINIMUM of COST When obsolescence and a critical labor short* 9e "leant up" oa coal and ash handling, costa Qro bound to go "sky high". When Troy Sun* shade saw these costs were getting out oi band, It colled in Fairfield Engineers to study tbe probIsm and make a rocommendatloo. What Fairfield did recommend and Install makes Interesting reading to everyone with a desire to hold coal and ash handling costs lo a minimum. All of tbe facts ., . comparative costs . .actual photos al tbo Installation . . . Installation diagrams aro given In CASE STUDY 153. Send for your copy today. FAIRFIELD ENGINEERING COMPANY BUILDERS OF DEPENDABLE COAL AMD ASH HANDLING IQUIPMINT l: chicago avenue 5 MARION,-' OHIO. U. S.. A. Ociobor 1948 ' 1)8