Document 3N6Ln2E4BQQEg0G83djRV8a5D

APPLICATION CHECKS NEATER SHELL must b flaage-quatity <td, cl (oil 16 IneH tfc'uk. Ho the equipment VtueJ Cod* meet tha A$Ml Pressure UNINO meferlol Las to resist corrosion, Imtd op undvr spsrollpg tvmptralurvi. Whet#tr fOB cttQQM for lias' *<--tomont or <opp*r--kBo* (hot It'* applied right, Is free l ueckt ond bulges, has right thickness to withstand tsmperofera. pressure change OUTSIDE. Be certain yes giro the heeler o good (ululating coot--at licit 3 inches o! tS96 mopnvi/o block, troweled *m with cn*enf TUBS BUNDLE must be mode op ol hard capper with a support of toiler moral, usually brati. Annealed copper used for the tehas In the handle will develop togs MATERIAL HIGHLIGHTS PIPING. Moke steam sopply ond refers lines as short os possible. If steam line bos te be. long, pet In traps before going Into the heeter MOUNT heater as high os pouihle to giro a substantial hood on tho receiving took, plus o good hydrostatic head on tho trap. Be sera the hooter's supports sot solid. See thof it It eioctiy level. You may host to btoco the support leg* to prevent ivoy OPERATION. Blow dawn a few gallons from the mud-blow every morning, surety once a week, to keep the heating eeil fren el dirt accomutofions MAINTENANCE. Drain and examine heater interior ovary' sis months for first few years, once o year thereafter. Check lin ing and tuba' condition, bundle support CH"'ZN'*` ^"',7'"' h"'"' "01u,al * *<"' demand, or. laf VIITlCM wok be., .her. Ih. door .pace I. Hah., Iho hed roa CO Ham. na, continuous With u-opot control! thoy gl.e iho decl.ed tempmtml "t,,',|u|. Tube bundle 1, very ihort ond petmili eoiy handling and molmonon. t Lick Your Storage-Heater Problem By Proper Application, Auxiliaries By P P IANKOW, Pattema-Kolloy Co The Hot-wATtn stoiiacc hcater enjoys a basically simple design. With this start In life, you cen look for and should get long, troubleftee service. Problems you run into usually result from poor application, improper mater ials or faulty selection of auxiliaries like traps, check valves, thermostatic tem perature-regulating valves. Horizontal storage heater, photo obove, la the most common design. AH it consists ef la a shell and a removable heating section, made up ol a nest or buodle of copper tubes formed into a horisonta) U* or hairpin-shaped ele ment. The lower you can spot a colt Into this shell, the belter the beater performance. Here's why: When unit is operating, cold water entera the shell beneath, but preferably vary elose to, the tube bundle, ft picks up heat from the tube surfaces ond then lighter water, end soon the hottest water appears at lop of shell. The ideal plaee to drew oA hot water is at thU level and that it exactly how It la done, photo above. So, with a tube bundle set at lowest practical point in the shell, you supply heat where you need it moat-- to coldest water. This tuba bundle in Itself presents special engineering problems. At you could expect, you want steam and steam alone to enter the coil. Then you must be sure any condenaato that forms in the bundle gets out as fast is possible. These jobs should definitely be part of the original engineering. They entail, an understanding of right trap sins, value ol a vacuum breaker, and so on. These auxiliaries and their problems could make an article by themselves. For the time being, lei's, slick to the heater. storage beattr. Where demands in sudden, and you'vo a heavy process er heating load as well, these hasten *r* vital to good operation. With them j can pull a relatively smalt, steady slew supply sod heat a large volume of wsta over period of time. With proper cco- trots, such as a thermostatic temper* lure-regulating valve, you can hold tfk' water at almost any temperature. Whai't more, with the right-sized storage f should never have to put any strain ts boiler output. ' Inslallollon follows these basic rote*- (1) Put in hot-water storogo heater - ils steam supply and return lines t1' short as possible, even at the expensed extending your water lines. (2) Moos' heater as high as possible. (ThU giro a substantial head to receiving tank std a good hydrostatic head on trap.) (3) \ natural convection currents take over. Cold, denser water by sheer weight shoves aside and replaces warmer, Hooter Application. Any plant where hot-water demands are net constant and continuous la a natural for a hot-water Be sure heater supports are solidly **: Over ond above tho simple rob* above are these expected precaution**' (1) Cheek that heater Is absolute!? >08 PLANT OPERATION AND MAINTENANCE SECTION POWE* 'i level.: (2) See thst insulation is applied --it'lust 3 in. ol B5% magnesia block troweled over with cement. (If heater tj e'tpoted to the elements, give it an additional canvai-duek covering, several easts ol paint. 0e sure, though, you lav# nameplate of heater exposed.) Propor Mottrloli. Heating element, or eoiC should be hard copper (for example, 1%-in. OD, No. 16 DWG seamlest drawn copper tubing, mill tested ts 1000 pii with just the bends onnailed ot time of fabrication). H's our experience shot soft or annealed tubing exgt between supports shortly after teing'lnio operation. These tags cause Packets to lorm; condensate collects in them to upset heater operation. flat usually you find no severe problemi'frora tubing materials. More often tksn net, h's additions and attachments to ihs'heater that act up. Tho. shell may b of many different febstances--carbon steel, copper alii- stainless sieel--and supplied, for steel, with special linings of copper, aluminum or cement, depending on the application. Steel is by far the most widely used shell material. It should be flsnge quality, of sufficient thickness (never less than % in.) to allow for corrosion, usually fabricated in keeping with ASME Pressure Vessel Codo (par U-69). But, even so, nagging corrosion ond electrolysis problems keep cropping up. Avoid Electrolysis. It's never good practice to install a steel shell and hook It up with nonferrous piping, particu larly when hoi water circulates through a system and back through the heater. What you'va got is just like a big stor age battery with the steel shell as one terminal and the dissimilar nonferrous piping as the other. The water acting ns an electrolyte, gets better each time it moves oround the system. Pretty soon inside surface of steel shell is plating off (ost. We've run Into healers suffering from this cause. If you catch them soon enough, putting in a cement lining sal vages them. Olten this answers another complaint--rusty or red water. There ore definite limitations, though. Never use a cement liniog where stor age temperatures ab^ve 180 F are con sidered. Cement tends to break down at temperatures above this point. Cop per linings or copper siileoa prove better materials lor this service. The sili con compound has the tensile' strength of steel combined with high corrosionresisting properties., ft works particu larly well with solutions that hove a corrosive action commercially pure cop per cannot withstand. Copper lining, properly installed, with seams electrically welded and the lin ing extended to nozzle and manhole openings, gives excellent service. By spinning the copper lining Into tube holes and expanding the tubes against this lining you get watertight joints, a further operating advantage. AUOtW 19M PLANT OPERATION AND MAINTENANCE SECTION tap