ไดอะแฟรม ซีล has launched the Fisher WhisperTube Modal Attenuator for noisy gas or vapour applications, which provides noise reduction in compressible fluid service for improved worker security, with no influence on course of move.
The modal attenuator is a full-bore system providing 15-decibel sound suppression to scale back noise inside pipes produced by sources upstream, such as control valves or different devices. – Image: Emerson

The modal attenuator from Emerson is a full-bore gadget providing 15-decibel sound suppression to scale back noise inside pipes produced by sources upstream, such as management valves or different units. It is put in downstream of those devices instead of a pipe spool piece, it generates no extra stress drop, and has no impression on course of flow.
Until now, all solutions have generated important pressure drop, decreased move, and/or introduced obstructions. This has led some users to install acoustic insulation to pipe sections to reduce noise, however this can be pricey and cumbersome to install, and it does nothing to reduce inside piping noise. The modal attenuator addresses these and different points with a drop-in answer, bettering worker safety and regulatory compliance, whereas reducing the danger of injury to downstream tools because of high noise levels inner to piping.
Leading purposes for the modal attenuator embrace these the place upstream process flows are modified by control valves, strain aid valves, pumps, compressors and different gadgets that generate noise. Many of those devices have to be put in in lengths of piping with no flow restrictions downstream, and the modal attenuator works well in these applications as a end result of it introduces no such restrictions.
In addition, the modal attenuator doesn’t introduce an obstruction into the piping, so it can be utilized in purposes the place particulates are suspended in course of flows, and/or the place pigging is required for cleansing and maintenance.
WhisperTube gadgets are offered in sizes from 2–12 in, with American Society of Mechanical Engineer (ASME) flange rankings of Class 150, 300 and 600. Pressure scores match the flange rating sizes, and the utmost temperature is 700°F (371° C).
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