When extreme, it threatens employee's safety and wellbeing. It causes "bad-neighbour" situations. And potentially, it warns of valve instability and pipeline vibration that can shorten equipment life. In answer to these valve noise problems, control valve manufacturers now offer special-design valve trims that employ various mechanisms to reduce gas, steam or vapour flow noise levels. While these special-design noise abatement trims may prove effective, their maximum performance levels fall short of that demanded by high-pressure drop and high flow rate installations.
Alpret claim to have a solution that meets these needs: Whisperflo trim is said to be "a new concept in multipath, multistage, acoustic energy management". It reduces valve-caused aerodynamic noise by as much as 40 dBA. The performance capability of Whisperflo trim surpasses conventional noise trims by 5 to 10 dBA. The attenuation ability that delivers predicted noise levels consistently, avoiding the costly need to recalculate product offers a noise and retrofit valves in order to meet performance promises.
Six techniques were used in order to achieve this performance, these being:
* Unique passage shape.
* Multistage pressure reduction.
* Frequency spectrum shift.
* Exit jet independence.
* Velocity management.
* Complementary body design.
Now customers can bring aerodynamic flow applications, existing or proposed, into compliance with mandated noise limitations. Plants or installations can be "good neighbours" to adjacent, populated areas. Employees' hearing safety can be enhanced. Another benefit would be the gaining of improved control of severe service, high pressure, high flow control loops.
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