NOISE CONTROLS NOISE CONTROLS FORFOR

PLANTS AND PLANTS AND MILLSMILLS

SOURCE PATH RECEIVERSOURCE PATH RECEIVER

NOISE EXPOSURE CAN BE NOISE EXPOSURE CAN BE REDUCED BY:REDUCED BY:

APPLYING CONTROLS TO THE APPLYING CONTROLS TO THE SOURCE (S)SOURCE (S)

BLOCKING THE PATH (S)BLOCKING THE PATH (S) ENCLOSING THE RECEIVERENCLOSING THE RECEIVER LIMITING THE EXPOSURE TIMELIMITING THE EXPOSURE TIME

RESILIENT SCREEN DECKINGRESILIENT SCREEN DECKING

TREATED HOPPERS & CHUTESTREATED HOPPERS & CHUTES

RESILIENT CRUSHER LINERRESILIENT CRUSHER LINER AND FEED PLATE AND FEED PLATE

CHUTE LINERSCHUTE LINERS

INSTALLATION OF INSTALLATION OF CHUTE DAMSCHUTE DAMS

VIBRATION ISOLATION MOUNTS

Barrier ConceptBarrier Concept

Shadow

Zone

Diffracted

PropagatedReflected

Noise Source

Barrier

ACOUSTICAL BLOCK WALLSACOUSTICAL BLOCK WALLS

STRIP CURTAIN BARRIERSSTRIP CURTAIN BARRIERSREQUIRE A 30 TO 50 % OVERLAPREQUIRE A 30 TO 50 % OVERLAP

TRACK MOUNTED PANELSTRACK MOUNTED PANELS

THE FOLLOWING DEVICES THE FOLLOWING DEVICES HELP TO REDUCE THE HELP TO REDUCE THE

AMOUNT OF TIME SPENT IN AMOUNT OF TIME SPENT IN HIGH NOISE AREAS THEREBY HIGH NOISE AREAS THEREBY LOWERING NOISE EXPOSURELOWERING NOISE EXPOSURE

CONVEYOR BELTING KEEPSCONVEYOR BELTING KEEPSMATERIAL ON THE SCREEN MATERIAL ON THE SCREEN REDUCING CLEAN-UP TIMEREDUCING CLEAN-UP TIME

SINGLE LUBE POINTS HELPSINGLE LUBE POINTS HELPREDUCE EXPOSURE TIMEREDUCE EXPOSURE TIME

REMOTE CCTV MONITORINGREMOTE CCTV MONITORING

BEARING SENSORSBEARING SENSORS

BIN LEVEL INDICATORBIN LEVEL INDICATOR

MOST OF THESE DEVICES CAN MOST OF THESE DEVICES CAN BE MONITORED BE MONITORED

INSIDE AN OPERATOR’S INSIDE AN OPERATOR’S CONTROL BOOTHCONTROL BOOTH

OPERATOR BOOTHS MUST OPERATOR BOOTHS MUST PROVIDE ADEQUATE VISIBILITYPROVIDE ADEQUATE VISIBILITY

MaintainMaintain YourYour Noise ControlsNoise Controls

Screen decking and chutes should be Screen decking and chutes should be inspected and replaced or repaired during inspected and replaced or repaired during down time if possibledown time if possible

Barriers around mills and crushing Barriers around mills and crushing equipment should be kept closedequipment should be kept closed

Windows and doors of control booths should Windows and doors of control booths should be tightly sealedbe tightly sealed

Remote sensors should be operationalRemote sensors should be operational

Additional ResourcesAdditional Resources

www.msha.gov/1999noise/Guides/MillPreptotalFinal.pdf

Your children can whisper to you now,

Don’t make them shout at you in the future