Document 71NaBz4QqB9n0yYwGBd3G9478

diminishes, the trouble may well be coiMlis. For, downtime due lo pipe failures and'limitations can seriously delay your production flow. Switch to Platecoils', the new tonic for production, n9 revolutionary as the new wonder drugs; Platecoils lake 60% less tank space leaving more room for greater payload. They heat or cool 60% faster. They simplify maintenance and save hours of downtime. Equally Important, Platecoils cost as much as 50%. less in the first place. -Platecoils cure production troubles involving beat transfer and give production a shot in the arm. 1 .Write for Bulletin P79 today I PLATECOILS SAVE 50% IN HEAT TRANSFER COSTS PUTCCOILS ELIMINATE A 8*10*1 HQUR*A*DAY euiQDiui* ma CHimNQ JUB At Sealed Power Corp Installation of Platecoils has completely eliminated o 0-to-8 hour-o-doy chipping Job. Threo Platecoils now heat a tank that prevlously took 4 pipe colls. Ask about qthor ease histories. PkAflCOII. REPLACES PIPE COILS ColMtio -- Diagnosed 05 tank beating and cooling problems. PUtccolla -- the pro* scriptlon for solving pipe coll problems. PtATKOtL DIVISION, HOLD-HOLD MANUFACTURING CO., LANSING 4, MICHIGAN 228 WATER TREATMENT us sodium silicate, Fig. 5. The hiah the feedwater's silica content, however' the stronger the boiler water's alkalinlt ' has to be to restrain the silica |,a reacting with live hardness to produce scale. Alkalinity Restraint. The stronger the boiler water alkalinity, the greater the driving force exerted behind the above desired reactions and, therefore, the bet. ter the rcsulte. But we also have to prevent alkalinity concentrations (rom developing too high. Otherwise, luam. ing starts and a severe carryover of solids with the stesm follows. With a package boiler, alkelinitles yielding a pH value o( 11.3 are generally a sale maximum. By carrying boiter-wster alkalinities within the pH range of 10-11.3 the calcium hardness precipi tates out completely as phosphate; the magnesium hardness comes down en tirely as hydroxide; silica slays safely in solution. Blowdown. Blowdown rote depends on the boiler water's alkalinity, silica and total solids concentrations. Civo a package boiler s minimum o( two sludge btows daily as standard practice, one in early morning, the other in late after noon during relatively light loade to tako advantage of any settling out of boiler-water precipitates. When you have to increase blowdown, spsee the blows equally between these primsry two. For a packaged-type unit In par ticular, frequent abort blow# prove moio effective than several long ones. Where a high blowdown rate aeons in order, put in a continuous blowdown syetemi. Such a boiler-water bleed can connect through the aurlace blowofl lopping in upper aide of shell. Bui even with a continuous blowdown In operation, keep up the minimum two bottom blows daily. Chemical Feed. Also feed internal treatment chemicals as a dolly routine, too, but not by ohot-feedlng methods because package units are too sensitiveRather the correctives cen be drlp-W into the receiving tank to maintain un form chemical balances. But, still, pump the treatment separately o continuously Into the boiler through * continuous feed connection made ot in* crou fitting of the return line just ot*1' side the boiler shell. Control Tests. Day-hy-dty control I* a must for satisfactory internol condi tions. Where the operating pressure below 100 psi and conditions are fairly stable, you can establish a definite bio** down practice and regulate chemic* treatment feed daily by o simple ph* pliaie colorimetric lest of boiler wsterRut for pressures from 100 to 250 p POWIR JUNf 1,53 Oh, I see 0IC now offers a complete line of Lubricated Plug Valves... with two added features 1 Triple teal gives more effec tive sealing at shank with ease af turning. 2 Lubricant grooves that are never exposed to the flowing liquid. . &WU JUNE 1933 QIC Tapered Lubricated Plug Valves assure positive, leakproof control of flow. O-RIng ... under initial compression, gives extra protection against leakage past shank. Resilient Peeking... completely enclosed in nonrotating metal parts, tends to seat the plug tightly in body without excessive cover tightness. Labyrinth Seol . . . series of concentric rings on gland collar make firm contact between collar and top of plug face, providing additional seal. 2 Vertical Lubo Grooves ... 180 apart. When ptug is given quarter turn, neither of these grooves is exposed to liquid flow. Lubricant Chamber . . . under pressure from screw piston, lubricant creates up ward force during lubrication, tending to free plug for easy turning. Plug Lapped to Body... to assure per fect, leakproof.fit. Order in semisteel.or steel.. . from your local OiC Distributor. Write for literature describing the advantages of OIC Lubri cated Plug Valves. THE OHIO INJECTOR COMPANY WADSWORTH, OHIO ALVES FORGED & CAST STEEL, IRON & BRONZE, LUBRICATED PLUG VALVES 229