Design & Implementation of a Sound Dampening System for an Industrial Application
A chemical manufacturing client in the Midwest was experiencing elevated noise levels due to an installation of vacuum pumps. The noise was exceeding 100 dB, posing a hazard for employees exposed to the sound and not conforming to OSHA Occupational Noise Exposure regulations. Acoustical Systems was contracted to remedy this situation, creating and implementing a custom noise abatement solution.
We monitored the existing sound levels in the workplace, analyzing the frequencies and sources of the sounds to determine an effective course of action. Our engineers were able to design a noise abatement plan, with the design goal of achieving 85 dBA TWA. We developed a sound enclosure for the pump room, procuring the materials and fabricating the components, then performing the installation. Overall dimensions of this two tiered system were 25' by 14' by 22' high. Materials used for this project include 4" two-sided metal acoustical enclosure (with 5 hinged access doors), two-sided composite acoustical curtain barrier wall, and quilted acoustical absorption blankets. The pipes penetrating the ceiling over the pump room were also treated with acoustical duct insulation.
Measurement Position Layout
A-scale Sound Level Data (Leq) Measured After Implementation
||A-scale Sound Level (dBA)|
||3' from Front Wall Right
||3' from Front Wall Center
||3' from Front Wall Left
||3' from Left Side Wall
||Aisle in Center of Room
||Aisle at Entrance of Room
After the installation was complete, performance verification testing was carried out, with measurements taken at 6 different locations in the space (see diagram above). The post installation measurements were 84 - 85 dBA around the enclosure and 77 - 81 dBA in the rest of the space results that exceeded our original design goals. The turnaround time for this project was 3 months, and the applications for such a project extends to all industrial situations where machinery like pumps, blowers, grinders, presses, and shakers are used. ASI guarantees our work and processes, creating noise control plans tailor made for each situation. For more information about this project contact us directly.
Sound Dampening System Project Highlights
||Pump Room Sound Enclosure|
||The objective of the project was to quantify the noise levels, compare the results to the project design goal of 85 dBA TWA, and develop a noise abatement plan to reduce the noise to the lowest feasible level.|
- Acoustical Engineering Studies Sound Level Monitoring
- Feasibility Studies
- Material Procurement and System Fabrication
- System Installation
- Performance Verification
- Two-sided 4 metal acoustical enclosure across the lower level of the pump room with five hinged access doors across the front wall.
- Two-sided composite acoustical curtain barrier wall above the metal above the pump room.
- Quilted acoustical absorption blankets attached to the existing CMU walls that form the rear right walls of the pump room.
- Acoustical duct insulation was applied to overhead piping penetrating the curtain tier across the front wall of the enclosure.
|Overall Part Dimensions
||25 by 14 by 22 high (two tiers)|
||The design goal of the project was to reduce the A-scale sound levels to 85 dBA TWA (Time Weighted Average).|
|In process testing/inspection performed
||Incremental Sound Level Measurements during different phases of the implementation|
||The system reduced A-scale sound levels measured during this assessment 84 - 85 dBA around the enclosure and 77 - 81 dBA in the rest of the area. These levels would result in a Time Weighted Average (TWA) levels below the project design goal of 85 dBA TWA.|
|Industry for Use
||Industrial Applications such as Pumps, Blowers, Grinders, Presses, Shakers, etc.|
||OSHA 1910.95 Occupational Noise Exposure|
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