1、 IEC 60534-8-4 Edition 3.0 2015-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Industrial-process control valves Part 8-4: Noise considerations Prediction of noise generated by hydrodynamic flow Vannes de rgulation des processus industriels Partie 8-4: Considrations sur le bruit Prvisions du bruit g
2、nr par un coulement hydrodynamique IEC 60534-8-4:2015-09(en-fr) THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechan
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19、77, 86 et CISPR de lIEC. Service Clients - webstore.iec.ch/csc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 60534-8-4 Edition 3.0 2015-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Industrial-process control valves Pa
20、rt 8-4: Noise considerations Prediction of noise generated by hydrodynamic flow Vannes de rgulation des processus industriels Partie 8-4: Considrations sur le bruit Prvisions du bruit gnr par un coulement hydrodynamique INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIO
21、NALE ICS 17.140.20; 23.060.40; 25.040.40 ISBN 978-2-8322-2879-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuille
22、z vous assurer que vous avez obtenu cette publication via un distributeur agr. 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 Characte
23、ristic presssure ratio x Fz. 9 5.3 Valve style modifier F d10 5.4 Jet diameter D j. 10 5.5 Jet velocity 10 5.6 Mechanical power W m10 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
24、 General . 14 7.2 Preliminary calculations 15 7.3 Prediction of noise level 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 F
25、igure 1 Examples of multistage trim in globe and rotary valves 16 Figure 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 M
26、ultihole trims 19 Figure 7 Eccentric rotary valves . 19 Figure 8 Butterfly valves 20 Figure 9 Segmented ball valve 90travel . 20 Figure A.1 The influence of the x Fzvalue on prediction accuracy 30 Table 1 Numerical constants N 9 Table 2 Typical values of A 11 Table 3 Indexed third octave center freq
27、uencies and “A” weighting factors. 13 Table A.1 Calculation: Examples 1 to 3 22 IEC 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
28、Electrotechnical Commission (IEC) is a worldwide organization 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 fie
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38、 of this IEC Publication may be the subject of patent 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-proce
39、ss measurement, control and automation. This third edition 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
40、 as a function of frequency. b) Elimination of the acoustic power ratio 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 r
41、eport on voting indicated in the 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 deci
42、ded that the contents of this publication 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 amende
43、d. IEC 60534-8-4:2015 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 lev
44、els could lead 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, c
45、age type, eccentric 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. Mo
46、st of the noise 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 no
47、ise conversion 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 un
48、predictable behaviour. 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
49、free field. Ideal 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 DN 15 to DN 300 size range, at inlet pressures up to 15 bar. However, some types of lo
