The Silent Treatment Fisher Solutions to Noise Problems ®
WHEN YOU PARTNER WITH EMERSON, YOU GET: Quality and Value Experience and Expertise Speed and Excellence n Broad solution offerings that have been tested at actual field operating conditions in the largest, most comprehensive control valve development center in the world. n Applications experience that comes from over 130 years in the process industry and Fisher® products at work in every major process.
The Silent Treatment | 3 Control Valve Noise C ontrol valve noise is a concern for plant operators and maintenance personnel because it can affect plant availability and profitability. High noise levels can cause health concerns for plant personnel and cause equipment damage, vibration, and control issues. Populated areas are moving closer to processing plants and noise attenuation is crucial to avoid complaints and potential regulatory action.
| The Silent Treatment Science of Noise Understanding the sources of noise and the nature of noisegenerating mechanisms is the foundation for designing and implementing effective measures to control noise. Aeodynamic Noise Sources Noise Definition Two locations of interest are within the control valve body. First is the throttling region where the relative fluid pressure is low and the fluid speed is high. High levels of fluid turbulence can result from the jets formed in the control valve trim.
The Silent Treatment | 5 Factors and Effects of Control Valve Noise Noise doesn’t always cause damage. The potential for noise damage and vibration are dependent on the following factors: n Pressure Drop and Pressure Drop Ratio – Greater drops in pressure and higher pressure drop ratios increase the potential for noise. The pressure drop ratio—the change in pressure divided by the inlet pressure—is an indicator used to determine the performance level required of the control valve trim.
| The Silent Treatment Control Valve Noise Technologies Two primary challenges face the control valve supplier: 1) effectively control unwanted noise and 2) accurately predict the noise levels associated with a specific control valve in a given set of operating conditions. Both of these challenges require a deep understanding of the foregoing fundamentals.
The Silent Treatment | 7 Accurate Noise Prediction 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 Silent Treatment Additional Selection Factors Quality Manufacturing Emerson is a pioneer in understanding noise-related problems in control valves. Through this understanding, Emerson leads the way in engineering and manufacturing noise control solutions that solve a variety of problems across an assortment of applications. Holding tight tolerances and selecting correct materials— which are part of a genuine Fisher solution—can extend control valve service life.
The Silent Treatment | 9 Fisher Whisper Trim I Cage ® ™ offers proven attenuation of aerodynamic noise in vapor, gas, or steam applications involving low to medium pressure drops. The Whisper Trim I cage offers economical, dependable noise attenuation in a variety of globe and angle valve bodies. It is widely used across all process industries, is incredibly effective, and offers great application flexibility.
| The Silent Treatment Fisher Whisper Trim III Cage ® ™ is a drilled hole trim available in a variety of control valve sizes and styles. It delivers excellent noise reduction for a wide range of vapor, gas, and steam applications. The design architecture allows for flexibility of size, pressure class, materials, rangeability, and attenuation.
The Silent Treatment | 11 Fisher WhisperFlo Cage ® ™ offers state-of-the-art attenuation of noise in vapor, gas, or steam applications involving large pressure drops. WhisperFlo trim is a laser cut, stacked-disk cage assembly that is available in a variety of globe and angle bodies for the most severe applications.
| The Silent Treatment Fisher Vee-Ball Control Valve with Rotary Attenuator ® ™ combines the efficiency of a rotary valve with noise control trim to provide improved performance for demanding applications. This design is used to reduce aerodynamic noise for steam, gas, and vapor applications. The Vee-Ball control valve features an attenuator welded on the back of the V-notch ball, which separates the flow into multiple smaller jets, reducing flow turbulence.
The Silent Treatment | 13 Fisher V260A Control Valve with Aerodome Attenuator ® is designed for gas and vapor service to help eliminate or reduce noise and vibration. The V260A is a full bore ball valve designed with features for optimized pressure, flow, and process control. The integral, drilled Aerodome attenuator controls noise and vibration from large pressure drop and high flow processes.
| The Silent Treatment Fisher Vent Diffuser ® offers proven noise attenuation in steam, gas, or vapor venting applications. A vent diffuser places backpressure on the control valve while venting process to the atmosphere. The Fisher vent diffuser shares the total system pressure drop with the vent valve. The benefits are: 1) the vent valve noise is reduced and 2) the noise at the atmospheric vent point is reduced.
The Silent Treatment | 15 Fisher Inline Diffuser ® offers noise attenuation in vapor, gas, or steam applications. A diffuser places back pressure on the control valve, thereby reducing the turbulence and pressure drop across the valve, which are main contributors in damaging noise and vibration. When paired with a Fisher control valve and Whisper Trim cage, the resulting solution is one that will provide the greatest level of noise attenuation for the most severe application.
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