Page 255 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition
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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
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