The client contacted a local acoustical consultant who in turn contacted the local Kinetics Noise Control, Inc. (KNC) representative. The
two groups met with the client and determined a plan of action which included: Identifying the primary and secondary noise sources; determining
the design goal dictated by the OSHA noise regulation; reviewing the process flow with respect to materials and personnel; developing conceptual
design options to present to the client.
Conceptual designs consisted of: perimeter treatment consisting of rigid, Kinetics NOISEBLOCK™ STL-4,
steel, double-wall, barrier walls; source treatment consisting of model STL-4, steel, double-wall, enclosures; and sound curtain perimeter
barrier wall and source enclosure options.
During the investigation it was determined that the predominant noise occurred in the 2000 Hz to 4000 Hz frequency range. This range is considered
the mid to high frequency range. It was determined a KNC model KNC-100BQQ sound curtain system could solve the noise issue. This product is well
suited for custom cutting and close fitting to the existing process as well as frequent and easy personnel access.
Advantages of Proposed Solution
The sound curtain panels introduced the needed attenuation, were cost effective with performance backed by independent sound tests per
applicable ASTM standards.
Kinetics Noise Control, Inc. (KNC) a recognized manufacture of noise control products and services supplied all necessary products.
- “In-plant” noise initiative
- Customer requested the KNC representative to provide product and installation
- There was a set budget
- Time Constraints governed by OSHA citation
- The target sound level of 85 dBA
- Current noise levels 110-117 dBA
- Any solution must take into account the normal traffic ofprocess and workers and not interfere
It was determined that custom curtain conveyor enclosures consisting of
close fitting conveyor covers around a main intake and discharge conveyor
path and multiple intake and discharge conveyor paths plus one large enclosure
around the main machining equipment was the best solution. This project
required KNC’s structural steel design expertise and product diversity in
order to fit and attach the proposed enclosures to the existing conveyors
and machinery. Due to the manufacturing diversity of KNC, the right products
were available to achieve the project requirements.
The conveyor covers and machine enclosure were manufactured of model KNC-100BQQ,
sound curtains. The curtain panels are constructed of a layer of 1.0 psf,
mass-loaded vinyl sandwiched between two layers of 1-inch thick fiberglass
quilt faced with aluminized vinyl cloth. The system included, clear view,
1.0 psf, mass-loaded, vinyl strip curtains for raw product entry and finished
product exit as well as personnel access.
The local KNC representative and in-house engineering team worked with
the installing mechanical contractor during the design and submittal phase
to make sure everything would fit to the existing process and not interfere.
The required noise reduction was achieved and the manufacturer continues
to operate with noise levels equal or less than the OSHA regulation. Due
to the success of this project the manufacturer ordered four more systems,
one for each of their manufacturing facilities throughout North America.