Best Practices Noise Control

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Best Practices Noise Control

• Preparation Plant Committee

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Committee Members

• Pat Brady - District 4
• Carlos Mosley - District 3
• Erik Sherer - Arlington
• Roger Henderson - District 4
• Michael Hunt - Arlington
• James Holbrook - District 6

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(No Transcript)
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Contribution of Task to Cumulative PEL Dose
250.00
A
200.00
C
B
D
150.00
C
PEL Dose ()
100.00
B
KEY



A Walking through plant
A
B Cleaning screen floors
50.00
C Control Room
D Waiting at froth cell for
plant to restart
0.00
756 AM
816 AM
836 AM
856 AM
916 AM
936 AM
956 AM
116 PM
136 PM
156 PM
216 PM
236 PM
256 PM
316 PM
336 PM
1016 AM
1036 AM
1056 AM
1116 AM
1136 AM
1156 AM
1216 PM
1236 PM
1256 PM
5
300.00
A
250.00
C
B
E
E
200.00
D
PEL Dose ()
KEY


E
150.00
AWalking through
C
plant
B Wash floors
100.00
C Wash vibrator floor
B
D Wash basement
floor
50.00
E Control Room
A
701 AM
732 AM
803 AM
834 AM
905 AM
936 AM
113 PM
144 PM
215 PM
246 PM
317 PM
348 PM
419 PM
450 PM
521 PM
552 PM
623 PM
654 PM
1007 AM
1038 AM
1109 AM
1140 AM
1211 PM
1242 PM
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High Exposure Tasks

• Facility Clean Up
• Equipment Inspection
• Equipment Maintenance
• Plant Circuit Operators

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Exposure Reduction with Barriers/ Isolation

• Curtains

• Solid Walls
• Total Enclosure
• Cement Floors

4-7 dBA
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Equipment Controls

• Screens
• Chutes
• Crusher
• Vacuum Pumps/ compressors/ jigs
• Motors

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Screen Controls

• Media - polyurethane

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Screen Controls

• Discharge Lip

Thickness
Urethane
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Screen Controls

• Mounts (Rosta, Marshmallow, Air bags)

8-12 dBA
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Screen Controls

• Banana Screens

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Chute Controls

• Lining

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Chute Controls

• Wrapping

• Hard Plastic Slurry Pipes

5 dBA
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Chute Controls

• Damping (up to 1/4 inch thick)
• Constrained Layer Damping

• Passive Damping w/ Material Build Up (Rock Box)

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Crusher

• Primary Crusher - limited exposure

• Secondary - damping/ isolation

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Vacuum pumps/ Compressors

• Intake/ Exhaust - Relocate, Re-rout, Redirect,
  Mufflers

35-45 dBA
17-19 dBA
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Fans/ Jigs

• Intake/ Exhaust - Relocate, Re-rout, Redirect,
  Mufflers

SPARGE VALVE
EXHAUST FAN
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Motor Controls

• Redirect Intake/ Exhaust

• Silencers - Intake/ Exhaust
• Unidirectional Fan Blades (rebuild)
• Future - Buy Quiet

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Personnel Exposure Reduction

• Identify Tasks
• Essential - on-shift exams, spills, maintenance
  determination, quality control
• Flexible - washing, preventive maintenance, floor
  walking, station attending

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Personnel Controls

• Controls Rooms/ Remote Booths

20 dBA
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Other Controls

• Remote Monitoring (cameras)
• Remote Sensing (spills, quality, quantity,
  equipment, etc.)
• Control Relocation (circuit operators/ greasing)

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Administrative Controls

• Time Management (task delegation, shift length)
• Worker Rotation

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Summary

• No single control for preparation plant noise.
• A combination of controls will be needed to
  reduce overall employee exposure.
• A few controls may make impractical
  administrative controls feasible.

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Group Future Plans

• Analyze data collected last week at three
  facilities.
• Involvement with citation abatement.

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(No Transcript)