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November 13, 2012 (STOUGHTON, Wis.) ‒ In December 2011, Universal Acoustic & Emission Technologies began replacing complete exhaust systems for two Westinghouse 501D5 gas turbines (103.7 MW each) for the Puget Sound Energy-Fredonia station in Mount Vernon, Washington. The scope included expansion joints, transitions, silencers, stacks, appearance siding, new ladders and platforms, as well as demolition and installation for each system. Universal offered a system design that enhanced the acoustic desi...... continue reading
From: Distributed Energy Topics: Noise Attenuation
By Lori Lovely
“There’s an amazing need for noise attenuation,” insists Lahnie “LJ” Johnson, president and founder of Acoustiblok in Tampa, FL. “People are aware of noise—and they’re not tolerant of it.” It’s one of the biggest changes he’s seen in the industry, in the 10 years Acoustiblok has been in business. An increase in the use of onsite power is another noticeable change, as is its proximity to where we live and work. People are using locomotive diesel engines for generators, placing them in 40-foot containers ...... continue reading
From: Distributed Energy Topics: Emissions, Environment, Noise Attenuation
By Carol Brzozowski On a noise level decibel scale, rustling leaves is 10 a-weighted decibels, or dB(A). A pneumatic riveter is 130 dB(A). The pain threshold is 140 dB(A). A generator set ranging from 50 kW to 1,500 kW produces noise at the level of 85 dB(A) to 103 dB(A). On a descriptive scale of “very quiet” to “uncomfortably loud,” gensets are classified as “very loud.” And, in order to comply with Occupational Safety and Health Administration (OSHA) regulations for workers exposed to genset noise ab...... continue reading
From: Distributed Energy Topics: Emissions, Genset, Noise Attenuation
By Don Talend
Noise attenuation at onsite power generation facilities is a complex subject. Several experts in this area of environmental protection indicate that only recently have power facility designers and contractors begun to use available tools and site-specific engineering to attenuate noise with the necessary precision to meet local requirements with certainty. The prevailing sentiment, based on these experts’ experience, is that older practices have been used as a one-size-fits-all approach even in the face...... continue reading
From: Distributed Energy Topics: Environment, Noise Attenuation, Noise Containment
By Penelope B Grenoble
As Larry Hansen, principle engineer for Engineered Aeroacoustics in Minneapolis, MN, describes it, there are two approaches to sound attenuation. The ideal is to proceed step by step, each step documented, beginning with due diligence and concluding with system vesting. The advantages are obvious. Sound-attenuation requirements are considered from the get-go and are included in building design. There are no surprises, such as doors left off drawings or gaping conduit openings. The sound consultant works...... continue reading
From: Distributed Energy Topics: Environment, Noise Attenuation