Figure 1.-Increases in total mill dust levels as day or shift
progresses and dust sources are not addressed using control techniques
Figure 2.-Five dust monitoring locations at mill 1
Figure 3.-Respirable dust levels at location 5 with and without total
mill ventilation system
Figure 4.-Effectiveness of total mill ventilation system at removing
smoke from mill building
Figure 5.-Six dust monitoring locations at mill
2
Figure 6.-Percent reduction of respirable dust at each monitoring
location for 2 days of testing for both two and four fans using RAM-1 devices
Figure 7.-Temperature readings at three levels in mill building
during day 1 of testing with and without total mill ventilation system
Figure 8.-Worker taking gas sample for tracer gas analysis at exhaust
fan
Figure 9.-SF6 analysis-comparing four fans (T3) versus two fans (T4)
for total mill ventilation system. W, concentration recorded at west
fan; E, concentration measured at east fan; N, concentration recorded at north
fan
Figure 10.-SF6 analysis-effectiveness
of total mill ventilation system with windows open versus closed.
Concentration recorded at exhaust fan
Figure 11.-Ventilation profile curves.
A, Theorized ventilation profile curve with total mill ventilation system; B,
ventilation profile curve for mill 2
|
Back to Top
www.osha.gov
