(Emerson: Marshalltown, Iowa) -- Emerson has introduced the Fisher WhisperTube Modal Attenuator for noisy gas or vapor applications in a wide range of industries. The modal attenuator is a full-bore device offering 15-decibel sound suppression to reduce pipe noise produced by sources upstream, such as control valves or other devices. It’s installed downstream of these types of devices in place of a pipe spool piece, generates no additional pressure drop, and has no effect on process flow.

Industrial users have long searched for a solution to reduce process piping noise, but until now all solutions have generated significant pressure drop, reduced flow, or introduced obstructions. This has led some users to install acoustic insulation to pipe sections to reduce noise, but this can be costly and cumbersome to install, and it does nothing to reduce internal piping noise. The modal attenuator addresses these and other issues with a drop-in solution, improving worker safety and regulatory compliance, while reducing the risk of damage to downstream equipment due to high noise levels internal to piping.

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