EN 60534-8-4-2015 en Industrial-process control valves - Part 8-4 Noise considerations - Prediction of noise generated by hydrodynamic flow.pdf

1、BSI Standards PublicationIndustrial-process control valvesPart 8-4: Noise considerations Prediction of noise generated by hydrodynamic flowBS EN 60534-8-4:2015National forewordThis British Standard is the UK implementation of EN 60534-8-4:2015. It isidentical to IEC 60534-8-4:2015. It supersedes BS

2、EN 60534-8-4:2005 whichis withdrawn.The UK participation in its preparation was entrusted by TechnicalCommittee GEL/65, Measurement and control, to Subcommittee GEL/65/2,Elements of systems.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publicat

3、ion does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2016.Published by BSI Standards Limited 2016ISBN 978 0 580 82833 1ICS 17.140.20; 23.060.40; 25.040.40Compliance with a British Standard cann

4、ot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 29 February 2016.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 60534-8-4:2015EUROPEAN STANDARD NORME EUROPENNE EUR

5、OPISCHE NORM EN 60534-8-4 December 2015 ICS 17.140.20; 23.060.40; 25.040.40 Supersedes EN 60534-8-4:2005 English Version Industrial-process control valves - Part 8-4: Noise considerations - Prediction of noise generated by hydrodynamic flow (IEC 60534-8-4:2015) Vannes de rgulation des processus indu

6、striels - Partie 8-4: Considrations sur le bruit - Prvisions du bruit gnr par un coulement hydrodynamique (IEC 60534-8-4:2015) Stellventile fr die Prozessregelung - Teil 8-4: Geruschbetrachtungen - Vorausberechnung der Geruschemission fr flssigkeitsdurchstrmte Stellventile (IEC 60534-8-4:2015) This

7、European Standard was approved by CENELEC on 2015-10-20. 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 standard without any alteration. Up-to-date lists and bibliographical refer

8、ences concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a

9、 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yug

10、oslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Sta

11、ndardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 6053

12、4-8-4:2015 E BS EN 60534-8-4:2015EN 60534-8-4:2015 2 European foreword The text of document 65B/1005/FDIS, future edition 3 of IEC 60534-8-4, prepared by SC 65B “Measurement and control devices“, of IEC/TC 65 “Industrial-process measurement, control and automation“ was submitted to the IEC-CENELEC p

13、arallel vote and approved by CENELEC as EN 60534-8-4:2015. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2016-07-20 latest date by which the national standards conflict

14、ing with the document have to be withdrawn (dow) 2018-10-20 This document supersedes EN 60534-8-4:2005. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held responsible for identifying any or all su

15、ch patent rights. Endorsement notice The text of the International Standard IEC 60534-8-4:2015 was approved by CENELEC as a European Standard without any modification. BS EN 60534-8-4:2015EN 60534-8-4:2015 3 Annex ZA (normative) Normative references to international publications with their correspon

16、ding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any a

17、mendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu. Publication Y

18、ear Title EN/HD Year IEC 60534-1 - Industrial-process control valves - Part 1: Control valve terminology and general considerations EN 60534-1 - IEC 60534-2-3 - Industrial-process control valves - Part 2-3: Flow capacity - Test procedures EN 60534-2-3 - IEC 60534-8-2 - Industrial-process control val

19、ves - Part 8-2: Noise considerations - Laboratory measurement of noise generated by hydrodynamic flow through control valves EN 60534-8-2 - IEC 60534-8-3 - Industrial-process control valves - Part 8-3: Noise considerations - Control valve aerodynamic noise prediction method EN 60534-8-3 - BS EN 6053

20、4-8-4:2015 2 IEC 60534-8-4:2015 IEC 2015 CONTENTS FOREWORD . 3 INTRODUCTION . 5 1 Scope 6 2 Normative references 6 3 Terms and definitions 6 4 Symbols 7 5 Preliminary calculations . 9 5.1 Pressures and pressure ratios 9 5.2 Characteristic presssure ratio xFz. 9 5.3 Valve style modifier Fd10 5.4 Jet

21、diameter Dj. 10 5.5 Jet velocity 10 5.6 Mechanical power Wm10 6 Noise predictions . 10 6.1 Internal sound pressure calculation . 10 6.2 Transmission loss . 13 6.3 External sound pressure calculation 14 7 Multistage trim . 14 7.1 General . 14 7.2 Preliminary calculations 15 7.3 Prediction of noise le

22、vel 15 7.3.1 General criteria 15 7.3.2 Multistage devices (see Figures 1 and 3) . 15 7.3.3 Fixed multistage devices with increasing flow areas (see Figure 2) 16 Annex A (informative) Examples of given data . 21 Bibliography 31 Figure 1 Examples of multistage trim in globe and rotary valves 16 Figure

23、 2 Example of fixed multistage device with increasing flow area . 17 Figure 3 Example of multistage trim in globe valve . 17 Figure 4 Globe valve (Cage trim, V-port plug) 18 Figure 5 Globe valves (parabolic-plug) . 18 Figure 6 Multihole trims 19 Figure 7 Eccentric rotary valves . 19 Figure 8 Butterf

24、ly valves 20 Figure 9 Segmented ball valve 90travel . 20 Figure A.1 The influence of the xFzvalue on prediction accuracy 30 Table 1 Numerical constants N 9 Table 2 Typical values of A 11 Table 3 Indexed third octave center frequencies and “A” weighting factors. 13 Table A.1 Calculation: Examples 1 t

25、o 3 22 BS EN 60534-8-4:2015IEC 60534-8-4:2015 IEC 2015 3 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ INDUSTRIAL-PROCESS CONTROL VALVES Part 8-4: Noise considerations Prediction of noise generated by hydrodynamic flow FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide orga

26、nization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities,

27、 IEC publishes International Standards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt

28、with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by

29、 agreement between the two organizations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3)

30、 IEC Publications have the form of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are

31、 used or for any misinterpretation by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and th

32、e corresponding national or regional publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsib

33、le for any services carried out by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committ

34、ees and IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications

35、. 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent

36、rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60534-8-4 has been prepared by subcommittee 65B: Measurement and control devices , of IEC technical committee 65: Industrial-process measurement, control and automation. This third edi

37、tion cancels and replaces the second edition published 2005. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) Hydrodynamic noise is predicted as a function of frequency. b) Elimination of the aco

38、ustic power ratio BS EN 60534-8-4:2015 4 IEC 60534-8-4:2015 IEC 2015 The text of this standard is based on the following documents: FDIS Report on voting 65B/1005/FDIS 65B/1017/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the

39、above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts in the IEC 60534 series, published under the general title Industrial-process control valves, can be found on the IEC website. The committee has decided that the contents of this pub

40、lication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. BS EN 60534-8-4:2015IEC 60534-

41、8-4:2015 IEC 2015 5 INTRODUCTION It is valuable to predict the noise levels that will be generated by valves. Safety requirements, such as the occupational health standards require that human exposure to noise be limited. There is also data indicating that noise levels above certain levels could lea

42、d to pipe failure or affect associated equipment. See IEC 60534-8-3. Earlier hydrodynamic noise standards relied on manufacturer test data and were neither generic nor as complete as desired. The method can be used with all conventional control valve styles including globe, butterfly, cage type, ecc

43、entric rotary, and modified ball valves. A valve restricts flow by converting pressure energy into turbulence, heat and mechanical pressure waves in the fluid contained within the valve body and piping. A small portion of this mechanical vibration is converted into acoustical energy. Most of the noi

44、se is retained within the piping system with only a small portion passing through the pipe wall downstream of the valve. Calculation of the mechanical energy involved is straightforward. The difficulties arise from determining first the acoustic efficiency of the mechanical energy to noise conversio

45、n and then the noise attenuation caused by the pipe wall. This part of IEC 60534 considers only noise generated by normal turbulence and liquid cavitation. It does not consider any noise that might be generated by mechanical vibrations, flashing conditions, unstable flow patterns, or unpredictable b

46、ehaviour. In the typical installation, very little noise travels through the wall of the control valve body. The noise predicted is that which would be measured at the standard measuring point of 1 m downstream of the valve and 1 m away from the outer surface of the pipe in an acoustic free field. I

47、deal straight piping is assumed. Since an acoustic free field is seldom encountered in industrial installations, this prediction cannot guarantee actual results in the field. This prediction method has been validated with test results based on water covering a majority of control valve types, in the

48、 DN 15 to DN 300 size range, at inlet pressures up to 15 bar. However, some types of low noise valves may not be covered. This method is considered accurate within 5 dB(A), for most cases, if based on tested values of xFZusing the method from IEC 60534-8-2. The applicability of this method for fluid

49、s other than water is not known at this time. BS EN 60534-8-4:2015 6 IEC 60534-8-4:2015 IEC 2015 INDUSTRIAL-PROCESS CONTROL VALVES Part 8-4: Noise considerations Prediction of noise generated by hydrodynamic flow 1 Scope This part of IEC 60534 establishes a method to predict the noise generated in a control valve by liquid flow and the resulting noise level measured downstream of the valve and outside of the pipe. The noise may be generated both by normal