ISA 75 01 01-2012 Industrial-Process Control Valves - Part 2-1 Flow capacity - Sizing equations for fluid flow under installed conditions.pdf

1、 AMERICAN NATIONAL STANDARD ANSI/ISA-75.01.01-2012 (60534-2-1 MOD) Industrial-Process Control Valves - Part 2-1: Flow capacity - Sizing equations for fluid flow under installed conditions Approved 27 August 2012 Second Printing 2 October 2013 ANSI/ISA-75.01.01-2012 (60534-2-1 MOD) Industrial-Process

2、 Control Valves Part 2-1: Flow capacity Sizing equations for fluid flow under installed conditions ISBN: 978-1-937560-61-4 Copyright 2012 by IEC and ISA. All rights reserved. Not for resale. Printed in the United States of America. No part of this publication may be reproduced, stored in a retrieval

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4、reface This preface, as well as all footnotes and annexes, is included for information purp oses and is not part of ANSI/ISA-75.01.01-2012 (60534-2-1 MOD). This Standard has been prepared as part of the service of ISA toward a goal of uniformity in the field of instrumentation. To be of real value,

5、this document should not be static but should b e subject to periodic review. Toward this end, the Society welcomes all comments and criticisms and asks that they be addressed to the Secretary, Standards and Practices Board; ISA; 67 Alexander Drive; P. O. Box 12277; Research Triangle Park, NC 27709;

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18、ISSUES. THE COMMITTEE HAS NOT YET ADDRESSED THE POTENTIAL ISSUES IN THIS VERSION. The following people served as members of ISA Subcommittee ISA75.01: NAME COMPANY T. George, Chair Richards Industries W. Weidman, Managing Director WCW Consulting H. Baumann H B Services Partners LLC H. Boger Masoneil

19、an Dresser G. Borden Consultant S. Boyle Metso Automation USA Inc. E. Bunke Badger Meter C. Crawford Consultant J. Faramarzi Control Components Inc. A. Glenn Flowserve Corp. H. Hoffmann Consultant J. Kiesbauer Samson Aktiengesellschaft J. McCaskill Expro Group A. McCauley Chagrin Valley Controls Inc

20、. V. Mezzano Fluor Corp. J. Reed Consultant J. Reid Cashco Inc. M. Riveland Emerson Process Management E. Skovgaard Control Valve Solutions F. Volpe Masoneilan Dresser J. Young The Dow Chemical Company 5 ANSI/ISA-75.01.01-2012 (60534-2-1 MOD) The following people served as members of ISA Committee I

21、SA75: NAME COMPANY J. Young, Chair The Dow Chemical Company W. Weidman, Managing Director WCW Consulting L. Al-Awami Saudi Aramco H. Baumann H B Services Partners LLC J. Beall Emerson Process Management M. Bober Copes-Vulcan H. Boger GE Energy G. Borden Consultant S. Boyle Metso Automation USA Inc.

22、J. Broyles Enbridge Pipelines Inc. F. Cain Flowserve Corp. R. Duimstra Fisher Controls Intl. Inc. J. Faramarzi Control Components Inc. T. George Richards Industries C. Hergert Kellogg Brown any IEC National Committee interested in the subject dealt with may participate in this preparatory work. Inte

23、rnational, 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 agreement between the two organizations. 2) The fo

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29、jury, 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. 8) Attention is drawn to the Normative references

30、 cited in this publication. Use of the refere nced 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 rights. IEC shall not be held responsible for iden

31、tifying any or 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 publis

32、hed in 1998. 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 Psi

33、zing; changes to the non-turbulent flow corrections and means of computing results; ANSI/ISA-75.01.01-2012 (60534-2-1 MOD) 10 multi-stage sizing as an Annex. The text of this standard is based on the following documents: FDIS Report on voting 65B/783/FDIS 65B/786/RVD Full information on the voting f

34、or the approval of this standard 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

35、found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until th e 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, wi

36、thdrawn, replaced by a revised edition, or amended. 11 ANSI/ISA-75.01.01-2012 (60534-2-1 MOD) INDUSTRIAL-PROCESS CONTROL VALVES Part 2-1: Flow capacity Sizing equations for fluid flow under installed conditions 1 Scope This standard includes equations for predicting the flow of compressible and inco

37、mpressible fluids through control valves. The 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

38、equations for incompressible flow may be used 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/P1), compressible fluids behave similarly to incompressible fluids. U

39、nder such conditions, the sizing equations for compressible flow can be traced to the standard hydrodynamic equations for Newtonian incompressible fluids. However, increasing values of P/P1 result in compressibility effects which require that the basic equations be modified by appropriate correction

40、 factors. The equations for compressible fluids 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

41、1.65. Refer to Clause 7.2 for more information. For compressible fluid applications, this standard is valid for valves with xT 0.84 (see Table D.2). For valves with xT 0.84 (e.g. some multistage valves), greater inaccuracy of flow prediction can be expected. Reasonable accuracy can only be maintaine

42、d for control valves if: 0470218 .dN C Note 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 various equations an

43、d improve readability of the document. The accuracy of results computed with the equations in this standard will be governed by the accuracy of the constituent coefficients and the process data supplied. Methods of evaluating the coefficients used in the equations presented herein are given in IEC 6

44、0534-2-1. The stated accuracy associated with the coefficients in that document is 5% when Cv /d 2 0.047 N18. Reasonable accuracy can only be maintained for control valves if Cv /d 2 0.047 N18. ANSI/ISA-75.01.01-2012 (60534-2-1 MOD) 12 2 Normative references The following referenced documents are in

45、dispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60534-1:2005, Industrial-process control valves Part 1: Control valve terminology and

46、general considerations IEC 60534-2-3:1997, Industrial-process control valves Part 2-3: Flow capacity Test procedures ANSI/ISA-75.02.01-2008 (IEC 60534-2-3 Mod), Control Valve Capacity Test Procedures ANSI/ISA-75.05.01-2000 (R2005), Control Valve Terminology 3 Terms and definitions For the purposes o

47、f this document, the terms and definitions given in IEC 60534-1, and the following apply. 3.1 valve style modifier the ratio of the hydraulic diameter of a single flow passage to the diameter of a circular orifice, the area of which is equivalent to the sum of areas of all identical flow passages at

48、 a given travel. It should be stated by the manufacturer as a function of travel (see Annex A). 3.2 standard volumetric flowrates compressible fluid volumetric flow rates in cubic meters per hour, identified by the symbol QS, refer to either a) Standard conditions, which is an absolute pressure of 1

49、,013.25 mbar and a temperature of 288.6 K, or b) Normal conditions, which is an absolute pressure of 1,013.25 mbar and a temperature of 273 K. Numerical constants for the flow equations are provided for both conventions (see Table 1). 13 ANSI/ISA-75.01.01-2012 (60534-2-1 MOD) 4 Symbols Symbol Description Unit C Flow coefficient (Kv, Cv) Various (see IEC 60534-1) (see Note 4) d Nominal valve size mm (in) D Internal diameter of the piping mm (in) D1 Internal diameter of upstream piping mm (in) D2 Internal diameter of