Industrial Combustion
Monroe - Wisconsin

industrial combustion

Industrial Combustion designs and manufacturers force draft high-efficiency burners for commercial, industrial and institutional applications. SSA Acoustics was contacted to assist their design team to reduce the noise and vibration levels for their new burner line; we designed the main elements in their acoustic attenuation package that customers can order with the unit.

During our initial meeting and visit to examine the prototype unit, we met with their design engineers and the company president.  They explained the operation specifications and their noise goals.  Many of their units are installed in spaces that must not exceed the OSHA (12-hour) noise limit of 85 dB(A).  We did extensive sound pressure and vibration measurements on the prototype; the unit produced sound levels of 90 dB(A) at 3-meters during high burn and 96 dB(A) at 3-meters during burner firing.  The vibration levels from combustion peaked around 7-meters per second squared on the unit.

We examined the design drawings and the components of the unit to investigate solutions with respect to the units operation and fabrication. From our measurements and engineering analysis we were able to provide a clear design package to reduce the noise level from the unit.  We provided detailed recommendations to mitigate the combustion air intake, reduce the radiated noise and control the casing vibration.  

From our analysis of the sound data and the units operation, we worked with their engineers to design an air hood inlet that would reduce the sound pressure by 15 dB(A).  Our design went through multiple iterations to meet the dimensional tolerances and equipment specifications for the unit; this included modifying the design to account for the economizer package.  In addition, we designed rigid elements that could be easily fabricated and installed on the unit to reduce the vibration levels and the radiated noise levels.

The predicted performance of the final package exceeds the design goals; the final testing to quantify the effectiveness of the attenuation solutions is expected later this year.

1. The airhood design included perforated metal faced fiberglass duct lining, modifying the air path to maintain laminar flow and an optional addition of prefabricated low pressure drop duct silencers.

Noise Control Engineers