IEC IEC60534-8-3 Edition3.02010-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Industrial-processcontrolvalves- Part 8-3: Noise considerations - Control valve aerodynamic noise prediction method Vannesderegulationdesprocessusindustriels. Partie 8-3: Considerations sur le bruit -Methode de prediction du bruit aerodynamiquedesvannesderegulation IEC 60534-8-3:2010 Copyright Inter cal Commission y IHS under li Natil Uni of Singapore/5 otfor IEC IEC60534-8-3 Edition 3.02010-11 INTERNATIONAL STANDARD NORME INTERNATIONALE Industrial-processcontrolvalves- Part 8-3: Noise considerations - Control valve aerodynamic noise prediction method Vannes de regulation des processus industriels - Partie 8-3:Considérations sur le bruit-Methodede predictiondubruit aerodynamiquedesvannesderégulation INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE PRICECODE X CODEPRIX ICS 17.140.20; 23.060.40; 25.040.40 ISBN 978-2-88912-241-7 ?Reqi tional Electrotec Copyright Intermafional Electri nmission de la Co ise with IEC rovided by IHS under lic 60534-8-3@IEC:2010 2 CONTENTS FOREWORD INTRODUCTION. .6 Scope 2 Normativereferences. 3 Terms and definitions. .8 4 Symbols. 5 Valves with standard trim .12 5.1 Pressures and pressure ratios. 12 5.2 Regime definition.. 13 5.3 Preliminary calculations 14 5.3.1 Valve style modifier Fd 5.3.2 Jet diameter D. 5.3.3 Inlet fluid density P1 . 5.4 Internal noise calculations. 5.4.1 Calculations common to all regimes. 5.4.2 Regime dependent calculations 16 5.4.3 Downstream calculations. 5.4.4 Valve internal sound pressurecalculationatpipe wall 19 5.5 Pipetransmissionloss calculation. 20 5.6 External sound pressure calculation. 21 5.7 Calculation flow chart 22 Valves with special trim design. 22 6 6.1 General ..22 6.2 Single stage, multiple flow passage trim.... .22 6.3 Single flowpath,multistagepressure reductiontrim(two ormorethrottling steps).... 6.4 Multipath, multistage trim (two or more passages and two or more stages)......25 Valves with higher outlet Mach numbers ... .27 7.1 General . .27 7.2 Calculationprocedure. .27 8 Valveswithexperimentallydeterminedacoustical efficiencyfactors .28 9 Combination of noise produced by a control valvewith downstream installed two or more fixed area stages.. 29 AnnexA(informative)Calculationexamples. ..31 Bibliography ... Figure1-Single stage,multipleflowpassagetrim.. .23 Figure 2-Single flow path,multistage pressure reduction trim. ..24 Figure 3 -Multipath, multistage trim (two or more passages and two or more stages)...... 26 Figure4-Control valvewithdownstream installedtwofixed area stages. ..30 Table 1-Numerical constants N.. Table 2 - Typical values of valve style modifier Fa (full size trim). 15 Table3-Overviewof regimedependent equations.