Brochure
Accurate Noise Prediction
The Silent Treatment | 7
A top-down look at flow through Fisher WhisperFlo trim (left) using
computational fluid dynamics illustrates the independence of fluid
jets as they exit the cage. In contrast, the exit jets of some tortuous
path trims (right) impinge upon one another in pairs, creating an
additional noise source.
Emerson Innovation
You can get a larger selection of noise solutions from Emerson
because we spend more time studying control valve noise
than anyone else. Emerson studies the major sources of
control valve noise and has determined not only how to
predict noise, but also how to minimize it.
Emerson utilizes IEC 60534-8-3 for noise prediction and
is actively involved in developing the standard. The most
recent version of the IEC standard has sanctioned the use
of experimental data. We leverage our flow lab to provide
accurate aerodynamic noise data, validated through tests in
compliance with the IEC standard.
Aerodynamic noise testing is performed using real-world plant
conditions. We utilize a 3,500 psi air source and line sizes up to
NPS 36 pipe for noise testing. Control valves are flow tested in
the pipe, the aerodynamic noise is measured, and attenuation
concepts are studied to maximize noise reduction.
Noise testing of an NPS 12 vent diffuser.
There are many environmental factors that affect noise, so
isolating a test valve from other noise sources is important.
Emerson uses an acoustic test chamber to do exactly that.
The mobile, acoustic test chamber is placed around the
control valve being studied and noise measurements are taken
as defined by the IEC noise test standards.
Utilizing our world-class noise test room, we can accurately
quantify noise from devices in real-world installations. This
room allows Emerson to test a wide variety of configurations
at conditions well beyond the IEC standard.
Fisher control valve designs undergo thorough and extensive flow
testing in the 2,323 m
2
(25,000 ft
2
) flow lab in the Emerson Innovation
Center—the largest, most comprehensive control valve development
center in the world.