This document discusses how to select and size a rotary airlock feeder. Key factors to consider include the size and displacement required, the valve's intended function, and application pressure and temperature. Sizing depends on the volumetric capacity needed and the opening size. A chart lists volumetric capacities for different airlock models. Proper sizing examples are provided to determine the required displacement based on application feed rate and product density. A 12" airlock at 14 RPM or 14" airlock at 9 RPM would work for a sample application requiring 38,000 lbs/hr of sugar.
This document discusses how to select and size a rotary airlock feeder. Key factors to consider include the size and displacement required, the valve's intended function, and application pressure and temperature. Sizing depends on the volumetric capacity needed and the opening size. A chart lists volumetric capacities for different airlock models. Proper sizing examples are provided to determine the required displacement based on application feed rate and product density. A 12" airlock at 14 RPM or 14" airlock at 9 RPM would work for a sample application requiring 38,000 lbs/hr of sugar.
This document discusses how to select and size a rotary airlock feeder. Key factors to consider include the size and displacement required, the valve's intended function, and application pressure and temperature. Sizing depends on the volumetric capacity needed and the opening size. A chart lists volumetric capacities for different airlock models. Proper sizing examples are provided to determine the required displacement based on application feed rate and product density. A 12" airlock at 14 RPM or 14" airlock at 9 RPM would work for a sample application requiring 38,000 lbs/hr of sugar.
This document discusses how to select and size a rotary airlock feeder. Key factors to consider include the size and displacement required, the valve's intended function, and application pressure and temperature. Sizing depends on the volumetric capacity needed and the opening size. A chart lists volumetric capacities for different airlock models. Proper sizing examples are provided to determine the required displacement based on application feed rate and product density. A 12" airlock at 14 RPM or 14" airlock at 9 RPM would work for a sample application requiring 38,000 lbs/hr of sugar.
Choosing the proper type of rotary airlock feeder depends
on many factors, including:
The size and displacement required
The valves intended function (airlock, feeder, or both) Pressure and temperature of your application The characteristics of the product being handled
VOLUMETRIC CAPACITIES @ 80% POCKET FILL
Sizing MODEL 6" 8" 10" 12" 14" 16" 1420 1824 2830 Proper size depends on the volumetric capacity C.F.R 0.12 0.24 0.42 0.76 1.18 1.84 1.04 2.40 7.76 required and the physical dimensions of the DISPLACEMENT IN CUBIC FEET/ HR opening to which the airlock will attach. 5 36 72 126 228 354 552 312 720 2328 The chart on the right lists volumetric capacities 6 43 86 151 274 425 662 374 864 2794 for Prater Airlocks, assuming 80% pocket fill 7 50 101 176 319 496 773 437 1008 3259 efficiency. 8 58 115 202 365 566 883 499 1152 3725 9 65 130 227 410 637 994 562 1296 4190 In practice, pocket filling can vary depending on certain application variables: 10 72 144 252 456 708 1104 624 1440 4656 VALVE RPM
11 79 158 277 502 779 1214 686 1584 5122
Dense, fluidized, free-flowing powders 12 86 173 302 547 850 1325 749 1728 5587 (can result in 90-100% pocket fill) 13 94 187 328 593 920 1435 811 1872 6053 Lighter density, sluggish powders (can 14 101 202 353 638 991 1546 874 2016 6518 result in 60-80% pocket fill) 15 108 216 378 684 1062 1656 936 2160 6984 Pressure differential across the valve, 16 115 230 403 730 1133 1766 998 2304 7450 moving countercurrent to product flow 17 122 245 428 775 1204 1877 1061 2448 7915 (can reduce pocket fill efficiency to as 18 130 259 454 821 1274 1987 1123 2592 8381 little as 50%) 19 137 274 479 866 1345 2098 1186 2736 8846 20 144 288 504 912 1416 2208 1248 2880 9312 To determine the displacement required for your application, divide rate (lbs/ hr) by product density (lbs/ cu ft). Solution
Sizing Example In this application, a 12 airlock at 14 RPM or a 14 airlock at 9
RPM will work. If a valve is required to move 38,000 lbs/ hr of sugar with a bulk density of 55 lbs/ cu ft, the The larger 14 airlock would permit better mass flow of product displacement would be: whereas the 12 airlock might be selected based on economy, smaller height/ footprint, and higher operating speed. (35,000 lbs/hr 55 lbs/ cu ft = 636 cu ft/ hr) Note: For feeding applications, 10-15 RPM typically provides the most uniform discharge of product at the greatest fill efficiency.