Page 255 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition
P. 255
Mechanical Separations 227
SCALE OF
ATMOSPHERIC IMPURITIES
B
SPECIFIC GRAVITY ONE AND THAT THE DUST CONCENTRATION IS 0.6 GRAINS PER
IiDOCB CU. FT. OF AfR, THE AVERAGE OF METROPOLlTAN DISTRICTS.
Figure 4-1A. Size and characteristics off air-borne solids. By permission, Hoffman Handy Engineering Data, Hoffman Air and Filtration Sys-
terns, Inc.
tick size in the colllector effluent. Where this line inter- A projection of this point of collector effluent vertical-
sects the horizontall line marked 2.25 grains/cu ft, a verti- ly downward shows that a second high efficiency centrifu-
cal nine through thle point will indicate the effluent mean gal will be less than 50% efficient. A wet collector, fabric
pariticle size of 6.0 microns. arrester and electro-static precipitator will be not less than