Noise CalculationsOctave Band Centre Frequency, HzTotaldB(A)631252505001K2K4K8KUSPWLUSSPLDesignAttenuationGuaranteed SPL atSilencer DatasheetAtmospheric Vent SilencerFlo-Dyne Controls (UK) Ltd+44(0)1494 770088www.flo-dyne.netsales@flo-dyne.netProject: Turnkey Air Projects PLCProject: Bills New Gas PlantRef: P123/123/123Drawing No.S-621700888-1Drawn ByAntony EngineerIssue1Date08/08/88© 2026 Flo-Dyne Controls (UK) Ltd, Princes Risborough, UK100110120130140150166160150921021121221321421581521421161029282747274768502203656626460701Metre and 90° to discharge85KeyUSPWL = Unsilenced Sound Power LeveldB re 10-12 WattsUSPWL = Unsilenced Sound Pressure LeveldB re20 µPaAttenuation = Reduction in Sound Pressure LeveldB re20 µPaGuaranteed SPL = Guaranteed Sound Pressure LeveldB re20 µPaProduct ConfigurationModel NumberBOS123-123-1234ServiceSteamMaterial of constructionCarbon SteelMaximum Flowrate12000 Kg/HrSilenced Noise Level85 dB(A)Inlet Connection12 Inch NB 150LB RFSOOutlet ConnectionDirect to atmosphereDrain Connection1/2 Inch NPTTotal weight1234 KgProcess ConditionsGas / FluidSteamMw = 18SilencerPressureDrop10 BarOperating Flowrate10000 Kg/HrUpstream Pressure10 BarGUpstream Temperature200°FSilencer Inlet Pressure60 BarGSilencer Inlet Temperature200°FAcoustic PerformanceUnsilenced Noise Level155 dB(A)Attenuation70 dB(A)Silenced Noise Level85 dB(A)Dimensional DataAOverall Length4500mmBBody Diameter1000mmCSupport Height500mmDShell Thickness6mmEBottom Head Thickness6mmFSupport Bolt Hole Dia28mmGSupport Bolt Hole PCD1150mmJWeather Hood Height500mmKHeatshield Height1200mmMain MaterialsMain bodyCarbon SteelInlet NozzleCarbon SteelInlet FlangeCarbon SteelInternal PackingLong Strand Glass FibreAcoustic FacingCor-Ten SteelSupportsCarbon SteelLifting LugsCarbon SteelWeatherhoodCarbon SteelCleaning & PaintingInternal CleaningStandard cleaningInternal CoatingNoneExternal CleaningShotblast to SA2.5External CoatingAP Spec. 1234-001Mechanical Design ParametersDesign CodeGEPASME B31.3Pressure15 Psig15 PsigTemperature400°F600°CCorrosion Allowance1.5mm1mmNDTDPERT & DPEPressure Test5 BarG500 PsigOptionsBirdscreenYesDrain MufflerYesWeatherhoodYesSand ShieldYesMoving InletNoHeatshieldYesLift LugsYes(2)Tailing LugYesSupport LugsYes(2)Heat LaggingNoNameplateYesApplied LoadsCodeStandardWind LoadsASCE-7 (Latest)70Km/HrSiesmic LoadsASCE-7 (Latest)Low riskDrawing Options0 - Main body1 - Bottom dished head2 - Flat Head3 - Conical Head4 - Standard inlet nozzle5 - Single small nozzle6 - Single large nozzle7 - Two small nozzles8 - One small one large nozzle9 - Two large nozzles10 - Body sized connection11 - Moving Inlet (1)12 - Moving Inlet (2)13 - Weld Neck Flange14 - RFSO Slip On Flange15 - Plate Flange16 - Half Coupling17 - Hammer Union18 - Beveled For Welding19 - Side inlet nozzle - Left20 - Side inlet nozzle - Right21 - Dished head (top)22 - Flat Head (top)23 - Conical Head (top)24 - Outlet - single small25 - Outlet - single large26 - Outlet - body sized27 - Birdscreen28 - Vertical stack/tailpipe29 - Elbow - 45° cut30 - Elbow - 75° cut31 - Elbow - 45° Lobster back32 - Elbow - 90° Lobster back33 - Weatherhood - Simple Flat34 - Weatherhood - Dished Cap35 - Weatherhood - Chinese hat36 - Sand Shield37 - Nameplate38 - Drain - with plug39 - Drain - with flange40 - Drain Muffler41 - Heatshield Perforated42 - Heatshield Insulation43 - Lift Lug - Top Bar44 - Lift Lugs - Top rim (2)45 - Lift Lugs - Top rim (4)46 - Tailing Lug - Bottom (1)47 - Side Support Lug (1)48 - Side Support Lug (2)49 - Side Support Lug (4)50 - Side Support Lug (8)51 - Support Ring52 - Main Centreline53 - Support Lug Bolt Hole Centreline54 - Bottom Inlet Nozzle Centreline55 - Side Inlet Nozzle (Left) Centreline56 - Side Inlet Nozzle (Right) Centrelinecx=113 cy=71 r=19 x1=94 y1=71 x2=113 y2=52