Acoustic Absorption of Natural Gas Compression Facility Enclosures
In performing theoretical noise impact assessments on reciprocating gas compressor facilities, it is often necessary to predict the noise breakout from the compressor enclosures based on equipment manufacturer noise data, enclosure dimensions and wall construction. The prediction of the noise breakout from the enclosures is often based on the Sabine and/or Eyring room equations which are dependent on the average absorption coefficient of the room. Thus, in order to accurately predict the sound breakout from these facilities it is necessary to know the acoustic absorption of the interior of these equipment enclosures. Although the acoustic absorption data of the wall systems may be available, the absorption attributable to the non-enclosure surfaces, the equipment and fittings, is not typically known and is difficult to predict. These components, such as piping, instrumentation and mechanical equipment, often take on a typical arrangement, shape, volumetric density and material composition, and therefore it is useful to know the typical acoustic absorption attributable to these items. In order to more accurately predict the noise breakout from this type of facility, measurements were taken of the reverberation time of two typical compressor facilities in the field. Measurements and absorption calculations were performed in compliance with ASTM C 423-02a, Annex X2.