Universal is a global engineer and manufacturer in acoustic, emission and filtration systems. Since 1959, Original Equipment Manufacturers, packagers and end-users in the industrial process, power generation, marine, oil & gas, locomotive and waste water markets have relied on Universal. Our systems portfolio includes a vast complement of silencers, catalysts and filters for blowers, vacuum pumps, vents / blow offs, diesel & gas engines, gas turbines and compressors.
Blower silencers are required in many applications such as industrial processing and waste water treatment. With a resume that includes over 100,000 blower silencers sold to date, it is safe to say Universal is an industry expert in blower silencing needs.
There is little question that silencers are a necessity on any blower installation. Regardless of the size or speed of the blower, silencers of some type are nearly always used. In the selection of blower silencers, there are two basic considerations:
- the silencer must be the correct size
- the silencer must be the proper type for the application
The nominal silencer size need only be based on the gas volume. However, the silencer design must be selected with consideration of the blower size and operating speed.
In a closed blower discharge system, structure-borne noise such as that radiated by pipe wall and silencer shell may be a consideration, particularly where a strict, close-proximity noise specification applies. For these applications, various solutions are available to treat the pipe and shell radiated noise, such that most reasonable specifications may be met. For instance, it is possible to lag the silencer shell externally and reduce any shell noise contribution to below the casing and mechanical noise of the blower and driving machinery.
Is an absorptive silencer right for your application? The answer: it depends. That is why Universal is uniquely positioned in the industry, because we can take you through the process of selecting the right silencer for your needs. A global network of business offices and a large team of experienced acoustical system experts are at your disposal.
The absorptive silencer is the classic dissipative design, obtaining its noise control properties from the basic fact that noise energy is effectively “absorbed” by various types of fibrous packing materials. More technically, as sound waves pass through the spaces between the tightly-packed small diameter fibers of the absorptive material, the resulting viscous friction dissipates the sound energy as small amounts of heat.
Good Silencers for High Noise Frequencies
Absorptive silencers are very effective on high noise frequencies (500-8,000 Hz). At frequencies above and below this range, attenuation performance progressively diminishes. Since noise is absorbed by the packing material, absorptive silencers do not rely on internal baffles, tubes or other restrictive devices to achieve noise reduction. Consequently, absorptive silencers generally employ a “straight-through” or similar internal designs which inflicts very little air flow restriction.
Vent silencers are used in conjunction with systems that utilize a pressure relief valve. Typical applications for vent silencers are in oil and gas processing, industrial processing, chemical processing, heat recovery systems, and steam boilers. Universal’s vent silencers are used all over the globe on many applications.
HV Series vent silencers effectively silence high-velocity air, steam, and gas vents and blowdowns to atmosphere where sonic or critical conditions exist in the valve. Typical applications include: steam boiler relief valves superheater header relief valves boiler startup and purge high-pressure air vents natural gas blowdowns switch valves compressor blowoffs autoclaves steam ejectors.
A Complete Solution
Universal’s extensive in-house engineering, manufacturing, and testing facilities ensure an optimized process, mechanical and acoustic solution for any application.
Easy To Specify and Order
Vent and blowdown silencers are seldom a simple catalog selection. Usually, the purchaser provides detailed specifications and a system description that enables Universal to design a custom solution. An even easier way is to simply send the valve manufacturer’s data sheet for a vent to Universal and the experienced sales staff will recommend a silencer best suited for the application.
Industrial Fan Silencers
Fans are found in many applications. A fan may be used in industrial, HVAC and processing functions. However, in any mechanical device requires components to rotate at high speeds, noise can become an issue. Throughout Universal’s 50 year history, they have added new products to their offering to address this age old problem.
Primary air fans, forced draft fans and induced draft fans generally require some form of acoustical treatment. Most applications require inlet and/or outlet silencers to meet OSHA and other noise requirements. For continuous exposure, a maximum of 90 dBA is generally specified to avoid hearing damage. When conversation near the fan is desired, levels of 80 dBA and less are often needed.
Vacuum Pump Liquid Silencers
Separator-silencers are used to remove liquid from gas flow vacuum systems using either liquid-sealed rotary positive blowers or liquid ring vacuum pumps. Separator-silencers may be required for both the inlet (vacuum) and the discharge (atmospheric) of a vacuum system. Only the most stringent acoustical environments require significant inlet silencing. An inlet separator provides corrosion protection for the vacuum pump by removing most, if not all, of the process liquid before it enters the vacuum pump. The vacuum pump or blower discharge is normally extremely noisy and requires a high-performance separator-silencer.
Engine Exhaust Silencers
Universal brand exhaust silencers provide the most favorable performance for all applications by offering silencers crafted for four different attenuation grades. Due to the variability of different applications, performance levels are most accurately shown as broad range “expected attenuation bands,” which are based upon typical conditions. These bands will not define the exact insertion loss for a specific application, since insertion loss is influenced by engine size, type, speed and untreated noise levels.
Silencers for Small Spaces and Critical Applications
“Puck”-style silencers are low-profile silencers that not only fit in the smallest enclosures, but are also ideal for portable power, marine, or other applications where a “tight fit” is a concern. The single inlet models are available in residential, critical and hospital attenuation grades. Critical and hospital models also offer a low skin temperature (LST) design for exceptionally small compartments and enclosures to keep radiant heat to a minimum. The LST configuration incorporates an extra layer of packed acoustic/thermal insulation that reduces heat and noise, eliminating the need for expensive external wraps. The aluminized steel designs far outperform the comparably priced carbon steel competition by offering higher corrosion resistance, greater maximum operating temperatures, less weight and an overall longer silencer life.
Puck silencers are available in single-inlet, and four types of duel inlet models.