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Modifying Existing Old Equipment

 

The most common way to reduce the noise levels of common construction equipment is through worksite modifications. Some common worksite modifications consist of retro-fitting existing equipment with damping materials and mufflers. Below are examples of ways common construction equipment and worksites can be modified to reduce noise levels.

Modifying - Front End Loader
Problem:
Not actual vehicle from study
Solutions:
Benefits:
Costs:
• Noise control cab w/ air conditioning • 82-90 dB(A) • $12-15,000, 60-140 h
• Add sound suppression to existing cab • 82-90 dB(A) • $500-1000, 30-80 h
• Replace exhaust system • 90-100 dB(A) • $200-400, 2 h
Acoustically Treated Noise Level:
• 82-90 dB(A) for the operator

Reference: U.S. Bureau of Mines, Mining Machinery Noise Control Guidelines, 1983

 

Modifying - Pneumatic Nail Gun
Problem:
Sound level from pneumatic nail guns 94.5 dB(A) (at muffler)
Solutions:
• Improving the existing muffler
• Incorporating some type of "return" or exhaust line
Acoustically Treated Noise Level:
• Avg. Sound Pressure Level With Treatment - 75.5 dB
• Avg. Sound Pressure Level Without Treatment - 94.5 dB
Costs:
Item
Retail Cost ($)
Number Required
Cost per Unit ($)
Viton O-Ring
6.50
0.02
0.13
PVC Housing
1.15
1.0
1.15
8mm Bolt
1.07
1.0
1.07
Hose Plug
1.26
2.0
2.52
Total Goods
Mass Production (1/3 Retail Cost)
Estimated Production Cost per Unit
Total Cost per Unit
4.87
1.62
0.50
2.12

Reference: NIOSH, “Student Presentations - Pneumatic Nail Guns", 2002,

http://www.cdc.gov/niosh/topics/noise/CollegeStudents/nailgun/index.html

Excavator
Problem:
A Warner and Swasey excavator, equipped with a Detroit Diesel 4-53 engine (115 hp@ 2400 rpm) had a overall noise level of 80.5 dB (A) at 50 feet.
Solution:
In the quietest configuration, with improved exhaust and intake muffling, fan disengaged, and three sound panels around the engine, the overall level was reduced to 71. 5 dB (A).
Costs:
• Approximately $200-400.00

Reference: U.S. Bureau of Mines, “Noise Abatement Techniques for Construction Equipment,” August 1979

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