Document vypq9kaqLVRk3mQ8xDEKaoKkR

OIL-FlRIO BOILERS of the fntogrof-fumoce type wore selected B0IIER-FCID PUMPS In foreground, with toollto tottener ant to provide 100% standby and capacity for load growth phoiphote-feed pump In reor and feedwater storage tank, abow FORCED-DRAFT FANJ, ot rear of bollert, ora mofor-driven; olr volume li reguloted by automatically controlled dampen fUCUOIl HANOLINQ SBT consists of motor-driven centrifugol pump end a duplex unit, ll-hibe heaters, strainers end volvas Careful Planning Pays Big Dividends in Layout of Laundry Boiler Plant Putting "big-plant thinking" into the design of the smaller installation results in simplified, low-cost arrangement and efficient operation at the American linen Supply Co, Seattle By A F COMBS, Chief fngfoeer, American linen Supply Co * With the nnw conviction that an efficient well-coordinated boiler plant need -not be complicated, or full of "frills," we began preliminary studies in 1945 for new steam-generating equipment et American Linen Supply Co, Seattle,' Wash. The plant, which went into operation recently, proves' our point, we believe, and shows again that smaller plants need not lag be hind the parade. American Linen Supply furnishes freshly laundered uniforms, linens nod towels to hotels, restaurants, stores and similar businesses on a rental basis. In addition to the extensive laundry, there era facilities for manufacturing uniforms. Under direction and own ership of C W and R L Maryuit, this business has grown from the small laun dry of 27 years ago, employing 12 people, to today's plant with 230. Preliminary Study, Since laundryplant production depends on an ade quate supply of steam, the boiler room together with its equipment has always been a matter of great concern. Thus when growth of the business necessi tated an increase In steam-generating capacity for the third lime, we coaid not afford half measures. Experience has taught us that it always pays to make detailed studies; with present costs of labor and materials, we ore convinced that such studies are more profitable than ever. Among the many questions to be answered by our study were: 1. IThat tail future steam demand be? 2. Should toe supplement exifting equipment, or build an entirely new plant? 3. What sue and type of equipment should he Installed: Which fuel? Wkp type of boiler? What kind of aid iariej? How much control and metjt> ing equipment? $ 4. How thould equipment he h- ranged? i The existing boiler plant, which tul one 1500-sq-fl return tubular boBh, hod been extended a number of yew ago by the addition of a 75fl*<jd Scotch marine unit, and hogged-ftd firing had been replaced by oil barniai It was found that determination jd steam demand on the existing plant vn practically impossible. Proposed p tension of the laundry facilities fottbe complicated the picture ao we decud that future steam demand would M* to be established by Independent esiev. lotion. f.l estimating Steam. Laud. Amerip* Unen Supply is e member American Institute of LeundtrijtL whose research department has OR piled data an steam consumption o(<Pj various laundry machines and Idv? recommendations oo boller-plaBIV*t quiremonta. We thus predicted demand, from the proposed equipment, using the steam coatf# lions in the American Irutfuttjjj Laundering Guide. The table gf***.- tobulsied calculation. This estimate showed an average stand of about 17,000 lb per hr. To oteet this figure, we selected two units each having a maximum continuous ca pacity of 19,500 lb* per hr and a 2-hr peak capacity of 20,500. This left setae 'room to grow, and provided for 100% standby so maintenance and in spection can be earHed out during the oonnal work week instead of on over time. bssemebt of the main building. Thought was given to retaining existing boilers tot standby end adding only one new boiler. As the old units had seen al most 20 years of hard service and were occupying valuable space, we decided to Install all new equipment After looking into the many (acton involved, ** could see that the equipment should be boused in new addition to the main building rather than in a separate holler house. Fuel lelsctloa. Wartime fuel-shortMs experiences were stiU fresh In eut hds. Thus type of fuel to bo burned kt the new plant was of primary con- 'f*0' .In Seattle and throughout the "orthwew, many plants burn wood '^(bagged fuel) and sawdust, uso- on Bat grates {n dutch evens. Our . J*at did this et one time but was con- H firing. During the war it bed os If we would have to go hack *?Wig **! .1040 to hogged fuel, but fortunately the oil situation changed before this heavy'ex pense became necessary. After considering'the' relative econ omies of hogged fuel, coal and oil, we decided to stick with oil firing for thenew units even though It could be shown that on a Btu basis other fuels were cheaper. Lower first cost and operating-labor cost swung the final decision to oil Boiler Installation. In selecting the boifera it was determined that modem steel-encased higb-efficiency waterlube units of the integral-furnace type were most suitable. Even though steam was to be produced at 135 psi, 250-psl boil ers were chosen. The very small In crease In capital investment was war ranted In view of possible future use of generating. equipment, .changes in laundry techniques, sod better resale value. Although the initial installation In volved oil firing with wide-range burn ers, foundations for the boilers were ESTIMATED PUNT STUM LOAD Fgirfpmeitf Steam consumption, lb. par hr .. feeft unit Total UTS CMiMaaitM taw Sod| orwtov. Jftfrt anti ......................................... JOilJO-to. 2-cylMtr floTtwk Inoo OSto-nrell*!tc1M20t4m*. .ft.a.tw.o.r.k.t.m.w..r....... Stocking form .................. ........ hN-Oint form ........................ Mlthe ................ Olnct ottos la vetonon.. SalMIng (watlM mA Iter Into* >9X00 ed-ptr-ki flS-dos F ..... fcv**Mr er SuOtor from rectolmr to Totot Mmo c**>*rplto*,,,,,,,,, 15 SO tm. SS5 10000 00 LCmotaesOllrcrefofwnwB-MjBfrotrfmoaolWlo*nmrtmtotil,mAfmofrrofcmCnSInpttclltaol ttliowf UttntNooo.rtIoAoS/, the Oetvmteetlon et (45)} 49