VENT SILENCER — TECHNICAL DATASHEETSteam Service | Model: VSS-400-3000Weatherhood Type 3Lift LugsSupport BracketsInlet 4"ANSI 150# RFOutletDirect to AtmosphereWeight485 kgOverall Height: 1850mmØ 400mmInlet to Bracket: 320mmPRODUCT CONFIGURATIONModel NumberVSS-400-3000ServiceSteamMaterialCarbon Steel A36Paint FinishEpoxy Primer + Topcoat, RAL 7035Special CleaningNoLift LugsFittedSupport BracketsFittedWeatherhoodType 3Inlet Connection4" ANSI 150# RFOutlet ConnectionDirect to AtmosphereACOUSTIC PERFORMANCEUnsilenced PWL (USPWL)142 dB(A)Unsilenced SPL (USSPL)108 dB(A) at 1mDesign Silenced Level75 dB(A) at 1mDesign Attenuation33 dB(A)Predicted Performance74.2 dB(A) at 1mGuaranteed Silenced SPL75 dB(A) at 1mPROCESS FLOW DATAGas / FluidSteamMolecular Weight18.02Cp/Cv Ratio1.32Upstream Flowrate12,500 kg/hrUpstream Temperature185 °CUpstream Pressure10.5 bargInlet Pressure10.3 bargPressure Drop0.2 barOCTAVE BAND DATA (dB re 1pW)63Hz125Hz250Hz500Hz1kHz2kHz4kHz8kHzdB(A)9810510811211010610195118727068656360575275UnsilencedSilencedDrawing TitleCompany RefDrawing NumberVent Silencer DatasheetENG-2026-0142DWG-VSS-0042Customer Project RefCustomer RefDrawn ByPROJ-REFINERY-007PO-44821J. SmithDateIssueCompany Drawing No22-02-2026ADWG-VSS-0042