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SILENCERSCombining emission control withsilencing gen-sets & cogen packagesWhether you require a simple dropover gen-set housing or a cogeneration package in anacoustically-treated container, Silex will design to a client’s specific requirements in-house on its stateof-the-artengineering software programs and manufacture the finished product at its own plant.US-based Weatherford GlobalCompression, one of the world'stop three gas compressioncompanies, turned to Silex when itrequired a customised retrofit installationat a new Dolni Bojanovice facility. Thiswas located near the town of Hodonin inthe Czech Republic - where noise andemission standards are among the toughestof any nation.Silex began by analyzing on-handdetailed specs for the engine in question:Caterpillar's G3612 TALE Lean Burn Unit.Next, objectives were established forcarbon monoxide (CO), total hydrocarbons(THC) and non-methane hydrocarbon(NMHC) emission levels, that could meetall government regulations with acomfortable safety margin.Effective sound reduction levels wereespecially critical, so db(A) goals also hadto be determined - again, based ongovernment requirements and the engine'sknown characteristics.Finally, before silencer customisationcould begin, onsite and nearby residentialnoise factors had to be considered, aswell as any anticipated 24-hour variationin engine usage that might ultimatelySILEX PROJECT AT AGLANCEFacility: Dolni Bojanovice, CzechoslovakiaEngine: Caterpillar G-3612 TALE Lean BurnSilencer Type: Customized Hospital Grade2-Way SileNOXSileNOX Model: SC-JDDS-30-S16Length: 944.8 cm (372")Diam: 198.1 cm (78")Wt: 3,774.9 kg. (8,322 lbs)CO Output: .19 g/bhp/hrCO Reduction: 90%THC output: 2.975 g/bhp/hrTHC Reduction: 50%NMHC output: .35 g/bhp/hrNMHC Reduction: 50%Insertion Loss (Sound): 70 db(A)max @ 1.5m (4.9 ft)affect engineeringdesign."One of the early issueswe had to face,"commented Len Morris,Application SalesEngineer for Silex, "wasbalancing our virtuallylimitless capability forsound and emissionreduction, with costeffectivenessand practicality.We actually havethe potential here toreduce noise and emissions by almost100% if required, but in terms ofeconomics that would simply be overkill."Silex then began applying its engineeringexpertise towards customising itspatented Hospital Grade 2-way SileNOX -a state-of-the-art combination unit thatintegrates a number of advancedtechnologies to produce combinedemission control and silencing.Silex has the broadest range of silencersavailable from one supplier, says thecompany. It designs and manufacturesstandard silencers for general purposeapplications and custom models to fitmost OEM engines including dual-inlettypes for engines with dual exhausts.Silencers are manufactured fromaluminised steel, stainless steel or carbonsteel depending upon the application andsize. Its standard silencers cover a broadrangeof models:—Standard Reactive Silencers inSingle-Inlet/Single-Outlet andDual-Inlet/Single-Outlet Configurations—Combination Catalytic ConverterSilencers—Spark Arrestor Silencers—Absorptive Silencers for both Dischargeand Inlet Applications—Combination Reactive/AbsorptiveSilencers—Compressor/Blower Silencers—Gas Turbine SilencersSilencers size and capacity range from1-½” to 60” silencer inlets with varyinginsertion performance capabilities. Theyare used on engines from 5 to 15,000horsepower and for up to 60 dBA insertionloss.Most engine installations require that allpiping to and from the engine be suppliedwith flexible connectors. Silex says it hasa full range of connector products tomeet these needs.WIPInternet linkwww.silex.comTypical engineexhaust system.Silex Reactive Silencer: moreeffective at lower frequencies thanat high frequencies, and are mostwidely used.W ORLDWIDE I NDEPENDENT P OWER • MARCH 201231