Document jgnRBx948OLOoJz4MpqYk7ZbN

anglogold EVALUATION OF THE 104 LEVEL RABSON DUST FILTER UNIT MPONENG MINE 9 MAY 2003 JJ Dekker O-ESH Manager Occupational Hygiene South African Region Central O-ESH Team PURPOSE To evaluate the dust filtering efficiency of the 104 level Rabson dust filter unit. Both dust mass filtering efficiency and dust particle filtering efficiency was evaluated. METHODOLOGY Project was conducted at the 104 Level Dust Filter installation on Mponeng Mine. This unit is currently installed at the 104 Level station tips. Two AEROCET 531 particle mass and count instruments were utilised to determine the filtering efficiency of the Bona Dust Filter. Samples were collected at both the intake and the return of the dust filter unit. FINDINGS The detailed results of the particle filtrating efficiency tests and the mass filtrating efficiency tests are depicted in Appendix A. The negative efficiencies are mainly due to inward leakage's into the dust filter chamber. Visual leakage's were observed at: The intake inspection hole (This door must be fitted with sealing material and be kept locked at all times), The front wall (Cracks in wall, opening between wall and fan columns, and electrical cable inlet hole must be sealed), Filter chamber access door (door must be fitted with sealing material and kept locked at all times), Openings between base-plate and concrete foundation (these openings must be sealed). It was also observed that "clean side" of the base-plate and the inside chamber area was full of mud and dry dust. CONCLUSION No meaning full project results (filter efficiency values) could be obtained. RECOMMENDATIONS All leakage's (as discussed under "findings") must be addressed and the filter chamber properly cleaned. The determination of filtrating efficiency project must be re-conducted after completion of the above. Location 104 Level Stn. Dust Filter 104 Level Stn. Dust Filter 104 Level Stn. Dust Filter 104 Level Stn. Dust Filter Average APPENDIX A - Test Results 104 LEVEL F LTER UNIT (Particle Count Evaluation) INTA KE RETU RN EFFICIEN CY 0.5 u > 5.0 u > 0.5 u > 5.0 u > 0.5 u > 5.0 u > Overall Litre /Litre /Litre /Litre /Litre /Litre /Litre 412470 27461 187845 6695 54.5 98.4 56 410234 20544 155162 6056 62.2 98.5 63 372803 19511 160786 6507 56.9 98.3 57 228873 8462 147175 3029 35.7 98.7 37 356095 18995 162742 5572 52 98 53 Location 104 Level Stn. Dust Filter 104 Level Stn. Dust Filter Average 104 LEVE _ FILTER UNIT (Particle Mass Evaluation) I NTAKE RETUR N EF -ICIEN CY PM PM PM PM TSP PM PM PM PM TSP PM PM PM PM 1.0 2.5 7.0 10.0 1.0 2.5 7.0 10.0 1.0 2.5 7.0 10.0 mg/m3 0.009 0.151 0.895 1.092 1.244 0.017 0.215 1.37 1.765 3.051 -89 -42 -53 -62 TSP -145 0.008 0.07 0.615 0.753 0.868 0.006 0.102 0.424 0.486 0.557 25 -46 31 35 36 0.009 0.111 0.755 0.923 1.056 0.012 0.159 0.897 1.126 1.804 -35 -43 -19 -22 -71