A device for noise reduction in gas-piping applications
Most approaches to reducing pipe noise involve pressure drop or reduced flow. The WhisperTube Modal Attenuator (photo) addresses these issues as a drop-in solution that improves worker safety and regulatory compliance, while reducing the risk of damage to downstream equipment due to high noise levels. The modal attenuator is a full-bore device offering 15-decibel sound suppression to reduce noise inside pipes produced by sources upstream. Leading applications include those where upstream process flows are changed by control valves, pressure-relief valves, pumps, compressors and other devices that generate noise. The WhisperTube is installed downstream of these types of devices in place of a pipe spoolpiece. The WhisperTube device generates no additional pressure drop and has no impact on process flow. WhisperTubes are offered in sizes from 2 to 12 in., with ASME flange ratings of Class 150, 300 and 600. — Emerson, St. Louis, Mo.