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12 POWER COMBINATIOJ available with NORDBEteggl DIESELS .. a offl -a But' 1*3 and 3-cylinder modal* for 4 types of service 1. Fh MIN er SUSIIT (limit ItlVItt . . . lee* rteke *1 I. I *4 mIn, f<MR I I* 39 t.W. (I.OM H M.WS It Olrttl ** Slltf* Mlbf 1C * M -1. f*i StIAItHf fWII UIMFI ...* <Wct ef I, t ete I- ifHater Hdh. ellt (It* tSefl (* lete-eff ' ami (* ttWi Ireo 10 te 4J hr- 1 I. f* auroiweii iiK-orr... 1m ttekt il I, t id t-iyUnSM tin, Itm 10 It 41 Of, vtr* IwWOiw <lhk (e*t* leke-elf. c. * iwm mviti 1t*4 VfflMx Mill ft* iniiiItaf It ;*l| ihefft--4* tltclrll (topt-- till (Ihmm|IiI lailrlftftl tp-4e I'M too It MM ir *1 It It 340 ll. Mel See*. 'With 13 basic power combination*, Nordbtri Diesel-units offer you an e* uinil)) wide (election to tiilp tod get eaectlji the riahi kind of power to meet your specific requirements. NOIBftltO MOO. CO., Milwoakee, Wit. p-MAU THIS COUPON TODAY----- , | Norrfbe'Q Mlg. Co., MHwttlit, Wli, I I )tt4 catalog (ovtrlng Nordberp lypt ] i 4f$ Oltttli. I an Inlereited In o wnSt * | for Ike following tereice, AM J Year None............ ............................. . Canpotty Nona......................................... Addreit ...................................................... City................. Zone.... Slate....' 4-4tJ More TECHNICAL BRIEFS . ffeg/M aa me /JO setno total solid* content as zeolite soft* ening but containing substantially noth* Ing but sodium chloride. This process of treatment is consid ered to be particularly adaptable to the small power plant because It provides the advantage of both softening and ' alkalinity.reduction at a lower invest* ment cost than hot process water soft ener without the need -of maintaining proportional feeding devices, inlet level controls, vent condensers sod spray heal ers associated with the hot process water softener, without the use of acid or the requirement of blending devices, the need o( breaking pressure to deaerate or the need of feeding caustic lor pH control, one or more of which are asso ciated with any other method of doalkalization following zeolite softening. These advantages are weighed against the disadvantage of higher chemical costs and Ihe disadvantage of. no solids reduction as compared to hot process and split stream deslkaiisation methods. APC Paper, aa number. Add Regeneration of Codon ixehong- r*. By F K Undeay, Notional Alami nate Corp, There are two factors that are largely responsible for the choice of scid lo be used in any operation: (1) tho avail ability of the acid under consideration and.(2) the comparative cost of tho acids for the particular installation in volved. Sulfuric aeid Is most commonly used in Urge installations, for In most parts of the country it is more cconomi- eol. Hydrochloric acid is, generally se lected for the smaller installations for its greater ease of application as well as for the higher exchange capacities that ean usually be obtained. In the application of sulfuric acid for the regeneration of high capacity cation exchange resins, the ratio of each In dividual cation to the total cations In the raw water is very important. If there is a large preponderance of cal cium in the influent, tbtTt will b the same relative preponderance in the ex hausted resin bed. Because of the much greater capacity of the current poly styrene resins si compared to the older, low capacity hydrogen exchangers, the possibility of encountering calcium sul fate precipitation during regeneration is therefore greatly, increased- If, on the other band, there is a high percent age of sodium In the raw water, the sodium will predominate in the ex hausted bed sod. If not thoroughly elim- /nstod by the regeneration process, will result In sodium leakage during the operating cycle that follows. 1 (Continued on page 216) 114 llbowi hare thexe longer fangentt (dotted linei Indkate their length beyond ond< of ASA f/bowi). Tangent* are V* at ncminol diameter; a 12* elbow hot tongentt 3* long. This young man's dod olio saves money. But he does it by specifying Midwest LONG-TANGENT Elbows whenever he needs welded piping. Those elbows (see above) can be lined up with pipe more quickly and accurately, less pipe is re* qulred ond o short nipple (with Its extra dr* cumferentlal weld) Is frequently eliminated. Slip-on welding Benges ore easily used with minimum change in either flange or fitting. And then . , . Midwest "Long-Tangent" Elbows cost no more than ASA Pbows. You, too, can save money by specifying them on your next weld* fng fittings order. MIDWEST PIPING COMPANY# INC. Mete Offlcoi 1490 Wvtfc iMMd brW, U. Uel 4, Mo. Steev B. tek teak, lee Anffcs mi SeWee WhOKw Nne TeA r-SO Owrek Si. CM**** S-r* W#l Mem St. lot Aagain IS--Itfl I nOiwm U Wiwlw S-I1U CepiMl Am. TWm S--T14 Wright SM. U-4U Rfr B. srocxfNo omtfsuross m mmcimi cirm