Document 2g2kbrb6Jr7r0qD6v1DLNB36

More PRACTICAL IDEAS. Enameled Coal Screw* Save Oollar* Our TUftce 450-Kt* and two 250-hp boil er* bum coal- We had a troublesome corrosion problem a law years back In conveying con) from storage hopper to boilers. Suitor in wet coal iortned sul* furle acid, attacking the screw convey were sent to the Erie Enameling Co. They applied a hfgh-glost, acfd- and Impact-resistant enamel. Screws have been in service lor years. Besides, less horsepower Is needed to operate ors and housings. Screws lasted only three momhs. First, we used jobber costing. Hot although life of spirals was extended, coat was high and friction increased. Then we tried industrial porcelain en amel. Both the spirals and housings conveyors. AU new conveyors are row enameled before installation. And, when bare alee) begins to show, we taka con veyor out and send It to Erie hr a new cool. Thus we get the equivalent of a new conveyor for one-third the cost of a new one. And with less outage lime. Bob fftoccs New York, N. Y. Drilling Info Lines Under P. .ressureV Hcne arb plant-tested method* l ing Into lines or vessels under p Moat adapter parts are from sc Top sketch shows adapter. Hi this for putting a 2-in. connectlt 12-in. gas-oil line. Actual drilllt Stops Water Hammer in Blowdown Line 10 minutes. Drill was 1 47/64 , trouble of chips getting under vs cause 1-in, flushing connection is boiler water after -frequent open-and,closing. Lines with leaking valves were rid of chips. Drill Vk in. smaller than ID ol Pressure drop across orifice open much hotter than others. Load condition was such that wa didn't have chance te regrind valves last season. As we were short of valves, neither could we replace them nor could negligible even in high-pressure v To make adapter in top sketch Veld nettle to pipe that's to be ts 12) Fasten gate valve and drill t ment shown. we install new sea) valves beyond them. Inspecting' blowdown system, we found trouble. Blowdown line of each boiler wo* connected to a common head Second sketch shews adapter k< up, ready for drilling. To drill: Open gate valve, then drain Una. Start drilling. 13} Alter drilling thr We iiao troubles with boiler blow* down system. Each time that any one of er and common header vent to top of blowdown tank. System thus made a . pipe, pul) drill clear of goto vab* shut off. (4) Remove drilling < large U-tube working as dead pocket for condensate. So repeated Bushing and ment, and hook up piping. Bottom sketch shows method of cl condensing cycle* ol leaking boiler wa Ing out plugged-up feed noules in out boiler* was shut down before midnight, there was water hammer in blow lines early next morning. Water ham ter pushed, then drew back water col umn in deed pocket. Result was a series of water hammers, sketch. reactor of our fluid catalytic reft unit.* (1) Close valves 3 and 4. Remove blind flange at 5 and U' mer was not severe at first, but became louder and louder until it was pretty bad. Boiler blow-valves are. old-fashioned, gear-lift, solid-disk, single-valve type and We cut a hole in bottom of common header, welded a piece of pipe, installed a 14-In. valve, and ltd the. pipe to ash trench. By opening this small valve to drain common header, water hammer* drilling equipment. {3} Insert drill open valve 5. (4) Drill out pM* noule and flush out as necessary 1 velve connection 6, (5} Pull drill d out of valve 3 and thtit valve 6* l11 were no linger tight enough to sea) eventually stopped bothering us. blind flange at 5, open valves 1 ood If C Wtt Taipei, Free China S B Mono Montreal, Qoeb*t >34 [Continued on page !2fl) nAm 'tM"0N tN0 HmNc8 SrctlON ijtepless, Wide Range Speed Control ^riplrect Coupled Draft Fans 257 Liquid Rheostats rontrol the speed of boiler by wound rotor motors you get: jpt/jmnjediata response to varying draft conditions. fwSrtooth; continuous, ttophti speed control. WiEquol-iaflsJfiVity over the entire operating range. BhL; ng&lf WORK*. Motor speed is varied by increasing and resistance. This is accomplished by raising and lowering and the level of current-carrying electrolyte. A pilot S^t^fansmits'draft condition to a lifting mechanism which Electrode position and electrolyte level. A full resistance P^ded in only 10 inches of electrode travel. The basic of liquid rheostat operation plus the utilization of spefc^?/-fogintcrtd electrodes gives a linear relationship between ' and electrode travel over the complete rheostat range. *** not mechanically connected to the motor it located to suit the most convenient plant layout. For com* '***!!*. contact your Allis-Chalmers representative or write 14S7544. ALLIS-CHALMERS ill Milwaukee 1, Wiseontiit mywbfi-'-' 1953 fACI