1、 IEC 60534-2-1 Edition 2.0 2011-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Industrial-process control valves Part 2-1: Flow capacity Sizing equations for fluid flow under installed conditions Vannes de rgulation des processus industriels Partie 2-1: Capacit dcoulement Equations de dimensionnemen
2、t pour lcoulement des fluides dans les conditions dinstallation IEC 60534-2-1:2011 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2011 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, e
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16、sur cette publication ou si vous avez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60534-2-1 Edition 2.0 2011-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Industrial-process control valves Part 2-1: Flow capaci
17、ty Sizing equations for fluid flow under installed conditions Vannes de rgulation des processus industriels Partie 2-1: Capacit dcoulement Equations de dimensionnement pour lcoulement des fluides dans les conditions dinstallation INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE
18、INTERNATIONALE XA ICS 23.060.40; 25.040.40 PRICE CODE CODE PRIX ISBN 978-2-88912-399-5 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 60534-2-1 IEC:2011 CONTENTS FOREWORD . 4 1 Scope . 6 2 Normative references . 6
19、 3 Terms and definitions . 7 4 Symbols . 8 5 Installation 9 6 Sizing equations for incompressible fluids 10 6.1 Turbulent flow . 10 6.2 Pressure differentials 11 6.2.1 Sizing pressure differential, p sizing. 11 6.2.2 Choked pressure differential, p choked. 11 6.2.3 Liquid critical pressure ratio fac
20、tor, F F. 11 6.3 Non-turbulent (laminar and transitional) flow . 11 7 Sizing equations for compressible fluids . 11 7.1 General . 11 7.2 Pressure differentials 12 7.2.1 Sizing pressure drop ratio, x sizing. 12 7.2.2 Choked pressure drop ratio, x choked12 7.3 Specific heat ratio factor, F . 12 7.4 Ex
21、pansion factor, Y . 13 7.5 Compressibility factor, Z 13 7.6 Non-turbulent (laminar and transitional) flow . 14 8 Correction factors common to both incompressible and compressible flow . 14 8.1 Piping geometry correction factors 14 8.2 Estimated piping geometry factor, F P14 8.3 Estimated combined li
22、quid pressure recovery factor and piping geometry factor with attached fittings, F LP. 15 8.4 Estimated pressure differential ratio factor with attached fittings, x TP. 16 9 Reynolds Number, Re V16 Annex A (normative) Sizing equations for non-turbulent flow 18 Annex B (normative) Sizing equations fo
23、r fluid flow through multistage control valves 21 Annex C (informative) Piping factor computational considerations . 28 Annex D (informative) Engineering Data 34 Annex E (informative) Reference calculations 41 Bibliography 54 Figure 1 Reference pipe section for sizing . 10 Figure B.1 Multistage mult
24、ipath trim . 23 Figure B.2 Multistage single path trim 24 Figure B.3 Disk from a continuous resistance trim The complete trim consists of a number of these disks stacked together. . 25 Figure B.4 Sectional view of continuous resistance trim with multiple flow passages having vertical undulations 25
25、Figure C.1 Determination of the upper limit of the flow coefficient by the iterative method . 32 60534-2-1 IEC:2011 3 Figure C.2 Determination of the final flow coefficient by the iterative method . 33 Figure D.1 Piping geometry factors 37 Figure D.2 Pressure recovery factors . 39 Figure D.3 Liquid
26、critical pressure ratio factor F F. 40 Table 1 Numerical constants N 17 Table B.1 Values of the stage interaction factors, k, and the reheat factors, r for multistage single and multipath control valve trim . 27 Table B.2 Values of the stage interaction factors, k, and the reheat factors, r for cont
27、inuous resistance control valve trim . 27 Table C.1 Incompressible flow . 31 Table C.2 Compressible flow . 31 Table D.1 Typical values of valve style modifier F d , liquid pressure recovery factor F Land pressure differential ratio factor x T at full rated travel a). 35 4 60534-2-1 IEC:2011 INTERNAT
28、IONAL ELECTROTECHNICAL COMMISSION _ INDUSTRIAL-PROCESS CONTROL VALVES Part 2-1: Flow capacity Sizing equations for fluid flow under installed conditions FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotech
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39、r all such patent rights. International Standard IEC 60534-2-1 has been prepared by subcommittee 65B: Measurement and control devices, of IEC technical committee 65: Industrial-process measurement, control and automation. This second edition cancels and replaces the first edition published in 1998.
40、This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: the same fundamental flow model, but changes the equation framework to simplify the use of the standard by introducing the notion of p sizing ; chang
41、es to the non-turbulent flow corrections and means of computing results; multi-stage sizing as an Annex. The text of this standard is based on the following documents: 60534-2-1 IEC:2011 5 FDIS Report on voting 65B/783/FDIS 65B/786/RVD Full information on the voting for the approval of this standard
42、 can be found in the report 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 the parts of the IEC 60534 series, under the general title Industrial-process control valves, can be found on the IEC website. The co
43、mmittee has decided 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 ed
44、ition, or amended. 6 60534-2-1 IEC:2011 INDUSTRIAL-PROCESS CONTROL VALVES Part 2-1: Flow capacity Sizing equations for fluid flow under installed conditions 1 Scope This part of IEC 60534 includes equations for predicting the flow of compressible and incompressible fluids through control valves. The
45、 equations for incompressible flow are based on standard hydrodynamic equations for Newtonian incompressible fluids. They are not intended for use when non-Newtonian fluids, fluid mixtures, slurries or liquid-solid conveyance systems are encountered. The equations for incompressible flow may be used
46、 with caution for non-vaporizing multi-component liquid mixtures. Refer to Clause 6 for additional information. At very low ratios of pressure differential to absolute inlet pressure (p/p 1 ), compressible fluids behave similarly to incompressible fluids. Under such conditions, the sizing equations
47、for compressible flow can be traced to the standard hydrodynamic equations for Newtonian incompressible fluids. However, increasing values of p/p 1result in compressibility effects which require that the basic equations be modified by appropriate correction factors. The equations for compressible fl
48、uids are for use with ideal gas or vapor and are not intended for use with multiphase streams such as gas-liquid, vapor-liquid or gas-solid mixtures. Reasonable accuracy can only be maintained when the specific heat ratio, , is restricted to the range 1,08 0,84 (e.g. some multistage valves), greater
49、 inaccuracy of flow prediction can be expected. Reasonable accuracy can only be maintained for control valves if: 047 , 0 2 18 d N CNote that while the equation structure utilized in this document departs radically from previous versions of the standard, the basic technology is relatively unchanged. The revised equation format was adopted to simplify presentation of the va
