May 28, 2015
The requirement for low exhaust noise in emergency power systems continues to be a hot topic for facility managers (and code enforcement officers). In light of this demand, exhaust silencer manufacturers have designed ever-quieter solutions to abate noise, but a lack of consistency has remained in how silencers are rated for sound attenuation performance, according to a recent post from On-site Power Advisor.
The Electrical Generating Systems Association (EGSA), the world’s largest organization exclusively dedicated to on-site power generation, through a newly-published Standard, has now provided guidelines to address this issue.
As stated by EGSA, the purpose of their new Guide for Rating Generator Exhaust Silencers is to provide a uniform noise reduction rating system for exhaust silencers used on reciprocating internal combustion engines that are utilized for the purpose of generating electrical power.
Historically, EGSA says, there were four silencer “grades” that were very non-specific to performance, but simply reflected metro zoning that was common at the time. These were “industrial, commercial, residential, and hospital” grades. While these grades were useful at the time, a more precise criteria to express exhaust silencer performance is needed to meet the demands of today’s market.
The assumption was that if a manufacturer “labeled” their silencers one of these grades, then the silencer performance would be sufficient to meet a given metropolitan zoning area and provide normally acceptable noise levels. However, there were no quantitative numerical sound reduction criteria. With no performance standard for reduction criteria, these grades were not necessarily consistent. The amount of noise reduction for a given grade could vary between models and manufacturers.
The EGSA Guide for Rating Generator Exhaust Silencers was developed to provide quantitative, consistent silencer ratings that can be used by EGSA members, specification writers, acoustical consultants and facilities engineers with confidence that they get the noise reduction expected from a silencer labeled with a particular grade. This guide provides criteria for the classification of exhaust silencers that are equipped on reciprocating internal combustion engines.
The table at right defines the normally expected range of Dynamic Insertion Loss (DIL) for the EGSA silencer grade classification when installed in the exhaust system of a stationary reciprocating engine. Note: DIL is the change in sound level at a specific point in space when a silencer is inserted into the exhaust system. It includes the effects of raw engine exhaust noise, exhaust flow, temperature and self-noise.
EGSA’ Standard is available for download at no cost – Download now.
What this means to you
EGSA’s Guide for Rating Generator Exhaust Silencers provides a uniform noise reduction rating system for exhaust silencers used on reciprocating internal combustion engines that are utilized for the purpose of generating electrical power.
MIRATECH can help
Contact MIRATECH to learn more about MIRATECH Engine Silencers – reliable, high-performance products with superior mechanical and thermal durability. A variety of silencers are available to satisfy a multitude of applications that are suitable for diesel, gasoline, and gaseous fueled engines ranging from 20 to 20,000+ HP.