using enclosed cabs for reducing dpm exposures
TRANSCRIPT
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Using Enclosed Cabs for Reducing DPM Exposures
James NollNIOSH
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Equipment can have pressurized cab
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Cabs can be very efficient in reducing DPM exposures
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Two Key Components• Effective Filtration • Cab Integrity
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Effective Filtration 1. Pressurized Intake 2. Recirculated Cab Air
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Pressurized Intake (Outside) Air• Protection rills 2.5 to 84
– Bulldozers 0 to 45• Field Studies of
Refurbishing Old Cabs • Laboratory Study of
Cab Filtration systems
• 40 – 140 cfm • At least 25 cfm per worker to dilute CO2• MERV-16 mechanical filter • Powered Unit : Self-cleaning or centrifugal design
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Recirculated Cab Air
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Recirculated Cab Air
• Effectiveness is by multiple passes through filter media
• Substantial reduction in cleaning time from in-cab dust sources
• MERV 14 -16 rated filter media
• 3-4 times the intake airflow quantity (200-300 cfmtypical)
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Cab IntegrityInstalling new doors gaskets and
seals/plugging and sealing cracks and holes
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Pressure Monitoring TestingOutside tubing location
for pressure monitorData logger and Pressure Monitoring System
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Evaluation of Enclosed Cabs
Bolter Drill
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Enclosed cab design
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Cab Door Opening
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Limitations
• Maintenance– Change filters– Cab integrity
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Limitations
• Maintenance– Change filters– Cab integrity
• Not all vehicles have an effective enclosed cab– Size– Visibility
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Limitations• Maintenance
– Change filters– Cab integrity
• Not all vehicles have an effective enclosed cab
– Size– Visibility
• Not all miners can work in enclosed cabs
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James Noll
412-386-6828