Dust Control Handbook for Industrial Minerals Mining and Processing

Air Spray Manifold .................................................................................................................. 203Exhaust Ventilation .................................................................................................................. 204Safety Issues ........................................................................................................................... 205EFFECTIVENESS OF CLOTHES CLEANING TECHNOLOGY ............................................... 205CURRENT STATUS OF CLOTHES CLEANING REGULATIONS ........................................... 206HOUSEKEEPING PRACTICES ............................................................................................... 207TOTAL STRUCTURE VENTILATION DESIGN ...................................................................... 210PRINCIPLES OF TOTAL STRUCTURE VENTILATION ......................................................... 210Clean Makeup Air Supply ......................................................................................................... 211Effective Upward Airflow Pattern ............................................................................................... 212Competent Shell of Structure ...................................................................................................... 212VARIABLES AFFECTING TOTAL STRUCTURE VENTILATION .......................................... 212Costs ..................................................................................................................................... 213OPEN STRUCTURE DESIGN .................................................................................................. 213BACKGROUND DUST SOURCES .......................................................................................... 214EXAMPLES OF SECONDARY DUST SOURCES .................................................................... 215Dusts from Outside Sources Traveling Inside Structures .................................................................. 215Personal Dust Exposure from Differences in Job Function Work Practices .......................................... 215Broken Bags of Product ............................................................................................................ 217Cloth Seat Material/Worn Acoustical Material ............................................................................... 218Dirty Work Boots .................................................................................................................... 218MAINTENANCE ..................................................................................................................... 220Work Practices to Reduce Dust Exposure during Maintenance Activities ............................................ 220REFERENCES ......................................................................................................................... 221CHAPTER 9: OPERATOR BOOTHS, CONTROL ROOMS, AND ENCLOSED CABSEFFECTIVENESS TERMINOLOGY ..................................................................................... 225FILTRATION AND PRESSURIZATION SYSTEMS ................................................................ 227Field Studies ........................................................................................................................... 227Laboratory Study ..................................................................................................................... 228Mathematical Model to Determine Enclosure Protection Factor .................................................... 229RECOMMENDATIONS FOR FILTRATION/PRESSURIZATION SYSTEMS ........................... 230Ensuring Enclosure Integrity by Achieving Positive Pressurization against Wind Penetration ................. 230Keeping Doors and Windows Closed ........................................................................................... 231xi