BS-EN-60534-8-4-2005.pdf
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1、BRITISH STANDARD BS EN ? 60534-8-4:2005 Industrial-process control valves Part 8-4: Noise considerations Prediction of noise generated by hydrodynamic flow The European Standard EN 60534-8-4:2005 has the status of a British Standard ICS 23.060.40; 17.140.20; 25.040.40 ? Licensed Copy: London South B
2、ank University, London South Bank University, Mon Jul 16 04:08:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSI BS EN 60534-8-4:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2007 BSI 2007 ISBN 978 0 580 53751 6 National foreword T
3、his British Standard is the UK implementation of EN 60534-8-4:2005. It is identical with IEC 60534-8-4:2005, incorporating corrigendum February 2006. It supersedes BS EN 60534-8-4:1994 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee GEL/65, Measuremen
4、t and control, to Subcommittee GEL/65/2, Elements of systems. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.
5、 Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:08:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD EN
6、60534-8-4 NORME EUROPENNE EUROPISCHE NORM December 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2005 CENELEC - All right
7、s of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60534-8-4:2005 E ICS 23.060.40; 17.140.20; 25.040.40 Supersedes EN 60534-8-4:1994 English version Industrial-process control valves Part 8-4: Noise considerations - Prediction of noise generated by hyd
8、rodynamic flow (IEC 60534-8-4:2005) Vannes de rgulation des processus industriels Partie 8-4: Considrations sur le bruit - Prvision du bruit gnr par un coulement hydrodynamique (CEI 60534-8-4:2005) Stellventile fr die Prozessregelung Teil 8-4: Geruschbetrachtungen - Vorausberechnung der Geruschemiss
9、ion fr flssigkeitsdurchstrmte Stellventile (IEC 60534-8-4:2005) This European Standard was approved by CENELEC on 2005-11-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standa
10、rd without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other
11、 language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Es
12、tonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Mon Ju
13、l 16 04:08:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Foreword The text of document 65B/556/FDIS, future edition 2 of IEC 60534-8-4, prepared by SC 65B, Devices, of IEC TC 65, Industrial-process measurement and control, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
14、 EN 60534-8-4 on 2005-11-01. This European Standard supersedes EN 60534-8-4:1994. The noise prediction methods for hydrodynamic flow presented in this standard have been revised. The improvements are mainly in the acoustic efficiency factors for cavitating flow for single orifice, multi-stage and mu
15、lti-hole trims and in the determination of transmission losses. This revised standard permits the prediction of the noise pressure levels by calculation without the need for coefficients determined by testing. The following dates were fixed: latest date by which the EN has to be implemented at natio
16、nal level by publication of an identical national standard or by endorsement (dop) 2006-08-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2008-11-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC
17、60534-8-4:2005 was approved by CENELEC as a European Standard without any modification. _ EN 60534-8-4:2005 2 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:08:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSI 3 EN 60534-8-4:2005 CONTENTS INTRODUCTION.4 1Scope 5
18、 2Normative references .5 3Symbols .6 4Preliminary calculations8 4.1Pressures and pressure ratios .8 4.2Characteristic presssure ratio xFz8 4.3Valve style modifier Fd9 4.4Jet diameter Dj9 4.5Jet velocity9 4.6Mechanical power Wm.9 5Noise predictions10 5.1Internal noise 10 5.2Transmission loss11 5.3Ex
19、ternal noise .12 5.4Frequency distribution (internal and external).12 6Multistage trim.13 6.1General.13 6.2Preliminary calculations.13 6.3Prediction of noise level.14 Annex A (informative) Examples21 Annex ZA (normative) Normative references to international publications with their corresponding Eur
20、opean publications27 Bibliography .26 Figure 1 Examples of multistage trim in globe and rotary valves15 Figure 2 Example of fixed multistage device with increasing flow area.16 Figure 3 Example of multistage trim in globe valve .17 Figure 4 Globe valves (cage trim. V-port-plug)18 Figure 5 Globe valv
21、es (parabolic-plug) .18 Figure 6 Multihole trims19 Figure 7 Eccentric rotary valves .19 Figure 8 Butterfly valves 20 Figure 9 Segmented ball valve 90 travel.20 Figure A.1 Influence of xFz value on prediction accuracy25 Table 1 Numerical constants N.9 Table 2 Acoustic power ratio rW.9 Table A.1 Calcu
22、lation examples .22 Licensed Copy: London South Bank University, London South Bank University, Mon Jul 16 04:08:41 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 60534-8-4:2005 4 INTRODUCTION It is valuable to predict the noise levels that will be generated by valves. Safety requirements, such as occ
23、upational health standards, require that human exposure to noise be limited. There is also data indicating that noise levels above certain levels could lead to pipe failure or affect associated equipment (see IEC 60534-8-3). Earlier hydrodynamic noise standards relied on manufacturer test data and w
24、ere neither generic nor as complete as desired. A valve restricts flow by converting pressure energy into turbulence, heat and mechanical pressure waves in the containing valve body and piping. A small portion of this mechanical vibration is converted into acoustical energy. Most of the noise is ret
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