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Sisteme de transport pneumatic
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  B ulky materials such as those shown in Table 1, page 7, can be conveyed pneumatically using a Cincinnati Fan “RBE” series exhauster. Followthe steps below to determine the fan best suited for your application.EXAMPLE: Assume a requirement to move 2400 pounds per hour of barley through 200 feet of straight, horizontal, round duct.NOTE:For each 90˚ elbow in your duct system, add 20 feet of straight duct to determine total equivalent straight duct length.For each 10 feet of vertical duct, add 10 feet to your total straight duct length.I.Convert pounds per hour to pounds per minute: 2400 lbs/hr ÷60 = 40 lbs/minII.Refer to Table 1, page 7. Find “barley” under material (column A) and read horizontally. Barley weighs 38 pounds per cubic foot(column B), requires 38 CFM of air per pound of material (column C) and a minimum of 5000 feet per minute conveying veloc-ity (column D).III.Determine the minimum cubic feet per minute (CFM) requirements:CFM/LB of Material38(from column C)xlbs/Minute=x 40(from step 1)1520Total minimum CFM required @ 5000 ft/min conveying velocity (column D)IV.Determine the system duct size and system static pressure requirements from Table 2, page 7. Read across the 5000 ft/minvelocity line to the 8” duct size column since this is the first (smallest) duct size column over 1520 CFM.We have selected 8” duct size with 1745 CFM (actual) and a velocity of 5000 ft/min.The friction loss is 6.02” SP per 100’ x 2 = 12.04” plus 3.5” SP suction pickup (column E, Table 1) = 15.54” total system staticpressure for 200 feet of straight 8” duct.V.Check fan rating tables for 1745 CFM at 15.54” SP at the lowest horsepower. From the RBE Industrial Exhauster catalog, we sug-gest a Model RBE-9. Interpolate 3499 RPM, 7.59 BHP.VI.If material being conveyed will be going through the fan, the fan BHP can be significantly increased. The approximate increaseis calculated as: 6 VII. MATERIAL CONVEYINGYOUR MATERIAL CONVEYING CALCULATIONS NOTES: 1. For each 10 feet of vertical duct, add 10 feet to your total straight duct length.2. For equivalent losses through elbows, see chart on page 9.3. Make sure you use correct density for location of fan. See note 3 NOTE: If conveying long,stringy material,be sure to specifyopen type wheel.Consult factory.  7 2600280030003200340035003600370038004000420044004500480050005200550056005800600070002040 1.082200 1.262355 1.442510 1.642670 1.852747 1.962825 2.082904 2.202985 2.323142 2.573300 2.833456 3.113532 3.253770 3.693925 4.014080 4.344317 4.854400 5.054553 5.404710 5.765500 7.822780 .932990 1.073210 1.243420 1.413630 1.593741 1.683840 1.783955 1.884060 1.994280 2.204400 2.434700 2.664810 2.785130 3.175345 3.445560 3.725879 4.175980 4.326200 4.636420 4.957470 6.743630 .813910 .934180 1.084470 1.234750 1.434886 1.495025 1.565165 1.655300 1.745580 1.925870 2.126140 2.336282 2.446700 2.776980 3.017260 3.257678 3.647820 3.788096 4.058360 4.339770 5.904600 .724950 .835310 .965660 1.096020 1.246184 1.316370 1.386537 1.466720 1.547080 1.717430 1.887780 2.067951 2.168480 2.468835 2.679200 2.899718 3.229900 3.3510248 3.6010620 3.8512380 5.245680 .656110 .756550 .866980 .967430 1.117637 1.187860 1.258073 1.328300 1.398740 1.549170 1.709620 1.859819 1.9410460 2.2210910 2.4111360 2.6112001 2.9112220 3.0212655 3.2413100 3.4615300 4.72227 3.26245 3.76262 4.33279 4.93297 5.56304 5.89314 6.23322 6.59332 6.95350 7.69367 8.48384 9.26392 9.70418 11.05435 12.02454 13.00479 14.68490 15.25505 16.27524 17.30611 23.60355 2.60382 3.01409 3.46437 3.94464 4.45476 4.71492 4.98503 5.26518 5.55546 6.15573 6.78600 7.41612 7.77654 8.85680 9.67710 10.50748 11.64764 12.05789 12.95818 13.85955 18.90511 2.17550 2.52588 2.88628 3.28668 3.71686 3.93707 4.15725 4.38746 4.62796 5.13825 5.65864 6.18882 6.48944 7.38980 8.021022 8.661078 9.681100 10.051137 10.781176 11.521375 15.65695 1.86748 2.15802 2.47855 2.82910 3.18935 3.37962 3.56988 3.761018 3.971070 4.401125 4.851176 5.301202 5.551284 6.321335 6.881390 7.441469 8.311496 8.611549 9.251604 9.891873 13.50909 1.63977 1.891048 2.081118 2.471188 2.781222 2.951258 3.121291 3.301327 3.481396 3.851467 4.251536 4.631571 4.861676 5.551745 6.021818 6.501920 7.281954 7.552024 8.102096 8.662445 11.801420 1.301530 1.611638 1.731748 1.971855 2.221908 2.351965 2.492017 2.632070 2.782184 3.082290 3.492400 3.712453 3.892620 4.432725 4.822840 5.212997 5.813060 6.033161 6.473276 6.923820 9.41 Ashes, CoalBarleyBeans, SoyBranCement, PortlandCinders, CoalCoal, PowderedCoffee, BeansCork, GroundCorn, CobsCorn, MealCorn, ShelledCotton, DryDust, GrindingFruit, DriedHair or Feathers, DryLime, HydratedMalt, DryOatsPlastic, GranulatedRags, DrySalt, CoarseSand, DrySawdust, DryWheat, DryWood Chips, HeavyWood Shavings, LightWool, Dry 403847161004530481525404530160-17530553-643526353048997-154815-247-155423836563536423659443836944242944239444242363563374573943.03.54.02.05.04.03.03.01.52.53.53.52.03.03.01.53.03.03.03.02.54.05.02.54.03.02.02.04500500052003500700060004000350035005000550055004000500040003000500048004500540045005500700037005800450034005000 WARNING Whereas fans are used inthousands of materialconveying applicationsaround the world, care mustbe used in their selection andlocation within each materialconveying system. Thematerial should be crushed,shredded or pulverized before  it passes through thefan to eliminate premature fanhousing, fan wheel and/orbearing failure which couldcause severe personal injuryand/or complete systemfailure. Please contact aCincinnati Fan sales engineerin your area for correct, safeselection for your specificapplication.
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