Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.
-
Upload
dustin-ross -
Category
Documents
-
view
214 -
download
0
Transcript of Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.
![Page 1: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/1.jpg)
Noise Control Practices in the Workplace
STEP Network MeetingAugust 17, 2005
![Page 2: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/2.jpg)
Noise
Before We Discuss Noise Control Let’s Review Some
Noise Concepts
![Page 3: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/3.jpg)
Noise Measurements
Noise Levels are Expressed as Decibels (dB)
![Page 4: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/4.jpg)
DEVICE dBAComputer 37 - 45
Refrigerator 40 - 43
Cloths Dryer 56 – 58
Garbage Disposal 76 - 83
Vacuum Cleaner 84 - 89
Lawn Mower 88 - 94
Weed Whacker 94 - 96
Leaf Blower 95 - 105
Circular Saw 100 - 104
![Page 5: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/5.jpg)
1+1+1 Does Not Equal to 3
The Decibel is a Logarithmic Unit of Measure So We Can’t
Simply Add Numbers
![Page 6: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/6.jpg)
Keep the Calculator in the Desk
We Can Use a Few Rules of Thumb
![Page 7: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/7.jpg)
“Shake, Rattle, and Roll”
How We Perceive Noise
![Page 8: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/8.jpg)
![Page 9: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/9.jpg)
High Frequency Noise
Power Tools, Saws, Grinders Other High RPM Equipment Sudden Release of Pressure
![Page 10: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/10.jpg)
High Frequency Noise
High Frequency Noises Deflect Easier, Are Easier to Shield,
Are Easier to Insulate
![Page 11: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/11.jpg)
![Page 12: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/12.jpg)
Low Frequency Noise
Power Presses Pumps, Compressors Other Low RPM Equipment
![Page 13: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/13.jpg)
Low Frequency Noise
Low frequency Noises Can Travel Around and Through Objects and Are Harder to
Shield and Absorb
![Page 14: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/14.jpg)
![Page 15: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/15.jpg)
Harmful Effects
Harmful Effects of Noise Are Related to the Noise Dose
![Page 16: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/16.jpg)
Is the Noise Harmful?
Ask Yourself:How Loud, How Long, How
Many Times?
![Page 17: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/17.jpg)
Noise Dose is a Combination
Intensity of Noise (how loud) Duration of Noise Exposure (how long) Frequency (how many times during
the day are they exposed to such a noise)
![Page 18: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/18.jpg)
Noise
Regulated as an 8 hour Time Weighted Average (TWA)
An 8 hr TWA of 90 dBA is designated as a Noise Dose of 100%
![Page 19: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/19.jpg)
First Rule of Thumb
5 dB Halving Rule
![Page 20: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/20.jpg)
5 Decibel Halving Rule
For Each 5 dB Increase in Noise, In order to be
Equivalent to the Previous Dose You Must Half the
Allowable Exposure Time
![Page 21: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/21.jpg)
Equivalent Dose of 90 dBA Over an 8 Hour TWA Period
95 dBA over 4 Hour TWA Period 100 dBA over 2 Hour TWA Period 105 dBA over 1 Hour TWA Period 110 dBA over ½ Hour TWA Period
![Page 22: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/22.jpg)
Duration (How Long)
The 5 dB Rule Can Be Useful in Estimating Whether a Noise or an Activity Would Result in Employees Being Exposed to
Noise In Excess of the PEL
![Page 23: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/23.jpg)
Example An Employee Must Enter a Pump Room
and Conduct Preventative Maintenance The Small Portable Sound Level Meter
Reads 105 dBA Inside the Pump Room How Long Could the Employee Stay in
the Pump Room Without Exceeding the Dose Equivalent Noise Exposure of 90 dBA over an 8 hour TWA?
![Page 24: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/24.jpg)
Answer
Employee Noise Exposure for 1 Hour at 105 dBA Would Be
the Dose Equivalent Exposure of 90 dBA for an 8 Hr TWA
.
![Page 25: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/25.jpg)
Administrative Controls
Likewise, Limiting Employee Exposure Time to Noise Can
Help Reduce the Possibility of Hearing Loss
![Page 26: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/26.jpg)
Watch Where You’re Standing
Employee Noise Exposures Often Depend on How Close They Are to the Noise Source
![Page 27: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/27.jpg)
Distance
Noise Quickly Decreases as You Move Away from the
Noise Source
![Page 28: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/28.jpg)
6 dB Double Distance Rule
Noise Will Decrease 6 dB Each Time You Double the
Distance (free field, point source only)
![Page 29: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/29.jpg)
![Page 30: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/30.jpg)
6 dB Rule Would Not Apply
![Page 31: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/31.jpg)
6 dB Rule Would Not Apply
![Page 32: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/32.jpg)
Distance From the Noise Source
Is It Possible to Move the Employee Workstation or the
Noise Source?
![Page 33: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/33.jpg)
If a Tree Falls in the Woods…
Moving the Employee or the Noise Source Doesn’t
Eliminate the Loud Noise, it Just Reduces the Employee
Exposure to it!
![Page 34: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/34.jpg)
Think Out Loud
In Moving the Source, Have You Created a Problem for
Someone Else?
![Page 35: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/35.jpg)
Isolation Methods
Can You Isolate the Noise Source or The Employee From
the Noise Source?
![Page 36: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/36.jpg)
Enclosing the Employee
The Cab of Heavy Earth Moving Equipment is a Good Example. They are Insulated
(and Air Conditioned).
![Page 37: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/37.jpg)
Isolation Methods
Install Barriers Between the Employee and Noise Source
Enclose the Noise Source Enclose the Employee
![Page 38: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/38.jpg)
Think Out LoudBe Careful When Constructing
Barriers or Enclosures. Noise May be Deflected Backwards Off the
Barriers or the Walls of the Enclosure Which Can Increase the
Noise Intensity on the Noise Source Side. Employees who Must
Service Equipment or Conduct Work in Those Areas May Now be
Exposed to Greater Noise than Before
![Page 39: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/39.jpg)
Deflection of Sound Waves in Enclosure Creates Louder Noise
![Page 40: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/40.jpg)
Noise Absorbing Material
The Good, The Bad, and The Ugly
![Page 41: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/41.jpg)
The Good
Noise is Absorbed, It’s Gone, It Wouldn’t Bother Anyone Anymore
High Frequency Noises are Easier to Absorb
![Page 42: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/42.jpg)
The Bad
Some Types Can be Fragile Some Types Can be Hard to Clean Some Can Be Expensive
![Page 43: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/43.jpg)
The Ugly
Some Types Can Be Very Expensive
Some Types Won’t Hold Up to Chemicals or Moisture
Some Types Can be Combustible
![Page 44: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/44.jpg)
![Page 45: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/45.jpg)
![Page 46: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/46.jpg)
Transmitting Vibration
Noise and Vibration Can Be Transmitted to Other Surfaces
Which Then also Transmits Noise
![Page 47: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/47.jpg)
![Page 48: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/48.jpg)
Controlling Noise Generated by Vibration Sources Dampners, Springs, or Isolation
Material under Motors and Large Equipment
Ensure Plates, Covers, Doors, and Access Panels are Securely Attached
Bent or Warped Shafts on Motors and Fans Can Create Vibration
Bad Bearings, Flywheels, Pulleys, Fan Blades, and Belts
![Page 49: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/49.jpg)
![Page 50: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/50.jpg)
By the Way
Poor Maintenance Can Be a Major Source of Noise
Exposure and One Which is Often Consider Economically
Feasible.
![Page 51: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/51.jpg)
Noise Created By Escaping Air
The Sudden Release of Air Can Be a Significant Source of
Noise Exposure
![Page 52: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/52.jpg)
Controlling Noise Created By Released Air
Muffler systems on Pneumatic Equipment When Available
Reduce Air Pressure if Possible Discourage the Use of Compressed
Air for Cleaning Purposes Only Use Approved Nozzles When
Compressed Air is Used for Cleaning
![Page 53: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/53.jpg)
You May Not Be The First
Person To Ask
Contact the Manufacturer of the Equipment and Request
Assistance in Determining Ways to Help Decrease Noise Output
of the Machines
![Page 54: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/54.jpg)
Hearing Protection
Hearing Protection is not a Noise Control Method
![Page 55: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/55.jpg)
Hearing Protection
Hearing Protection does not Reduce Employee Noise Exposure, It Reduces
the Potential Harm Which Could Otherwise Result in an Unprotected
Employee
![Page 56: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/56.jpg)
Hearing Protectors
Like Respirators, They are Only Effective if Used Properly
![Page 57: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/57.jpg)
Attenuation of Ear Plugs
The Greater the NRR Number the Greater the Protection
![Page 58: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/58.jpg)
Hearing Protectors
Ear Plugs and Other Types of Hearing Protection Have Limitations on How Much
Protection They Can Provide
![Page 59: Noise Control Practices in the Workplace STEP Network Meeting August 17, 2005.](https://reader035.fdocuments.in/reader035/viewer/2022062515/56649ccd5503460f949985b8/html5/thumbnails/59.jpg)
Attenuation of Ear Plugs
See the OSHA Web Page for Information on Calculating the
Attenuation of Ear Plugswww.osha.gov