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1、? BRITISH STANDARD BS EN ISO 13443:2005 Incorporating Amendment No. 1 (renumbers BS ISO 13443:1996 as BS EN ISO 13443:2005) Natural gas Standard reference conditions The European Standard EN ISO 13443:2005 has the status of a British Standard ICS 75.060 Licensed Copy: sheffieldun sheffieldun, na, Su
2、n Nov 19 15:55:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 13443:2005 This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under the authority of the Standards Board and comes into effect on 15 April 1997 BSI 21 Ma
3、rch 2006 ISBN 0 580 27240 0 National foreword This British Standard is the official English language version of EN ISO 13443:2005. It is identical with ISO 13443:1996, including Corrigendum 1:1997. The UK participation in its preparation was entrusted to Technical Committee PTI/15, Natural gas and g
4、as analysis, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and pr
5、omulgate them in the UK. A list of organizations represented on this committee can be obtained on request. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “Internat
6、ional Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a Briti
7、sh Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii and iii, a blank page, pages 1 to 9 and a back cover. Th
8、e BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No.DateComments 16149March 2006Renumbers BS ISO 13443:1996 as BS EN ISO 13443:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:55:31 GMT+00:00 2006, U
9、ncontrolled Copy, (c) BSI BS EN ISO 13443:2005 BSI 21 March 2006i Contents Page National forewordInside front cover Forewordiii Text of ISO 134431 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:55:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldu
10、n, na, Sun Nov 19 15:55:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 13443 May 2005 ICS 75.060 English version Natural gas Standard reference conditions (ISO 13443:1996 including Corrigendum 1:1997) Gaz naturel Conditions de rfrence standard
11、(ISO 13443:1996, Corrigendum 1:1997 inclus) This European Standard was approved by CEN on 17 April 2005. CEN 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
12、. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
13、 under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary
14、, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de St
15、assart, 36 B-1050 Brussels 2005 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 13443:2005: E Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:55:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Foreword The text of ISO 13
16、443:1996 has been prepared by Technical Committee ISO/TC 193, Natural gas, of the International Organization for Standardization (ISO) and has been taken over as EN ISO 13443:2005 by CMC. This European Standard shall be given the status of a national standard, either by publication of an identical t
17、ext or by endorsement, at the latest by November 2005, and conflicting national standards shall be withdrawn at the latest by November 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standar
18、d: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The te
19、xt of ISO 13443:1996 has been approved by CEN as EN ISO 13443:2005 without any modifications. EN ISO 13443:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:55:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 13443:2005 Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:55:31
20、 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 13443:2005 ii BSI 21 March 2006 Contents Page Forewordiii Introduction1 1Scope1 2Normative reference1 3Standard reference conditions1 Annex A (normative) Factors for conversion between reference conditions3 Annex B (informative) Equations for conver
21、sion between reference conditions5 Annex C (normative) Symbols7 Annex D (informative) Example calculations7 Annex E (informative) National usage of reference conditions8 Annex F (informative) Bibliography9 Table A.1 Factors for conversion between reference conditions4 Table E.1 National usage of ref
22、erence conditions9 Descriptors: Natural gas, tests, measurement, computation, testing conditions. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:55:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 13443:2005 BSI 21 March 2006iii Foreword ISO (the International Organization for Standar
23、dization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to
24、 be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft Internationa
25、l Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO 13443 was prepared by Technical Committee ISO/TC 193, Natural ga
26、s. Annex A and Annex C form an integral part of this International Standard. Annex B, Annex D, Annex E and Annex F are for information only. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:55:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Su
27、n Nov 19 15:55:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 13443:2005 BSI 21 March 20061 Introduction The multiplicity of so-called “standard reference conditions” of temperature, pressure and humidity (state of saturation) used in the measurement of natural-gas quality and quantity can cau
28、se much confusion. Failure to take unrecognized differences of reference conditions into account can have serious consequences in, for example, custody transfer applications. Often enough, even an experienced gas engineer may not recognize the potential for error, as the units of measurement usually
29、 employ identical terminology, irrespective of differences in the reference conditions. All of the ambiguity and its undesirable consequences may easily be removed by the adoption of a single standardized set of reference conditions. The set chosen in this International Standard will be known as the
30、 ISO standard reference conditions. 1 Scope This International Standard specifies the standard reference conditions of temperature, pressure and humidity to be used for measurements and calculations carried out on natural gases, natural-gas substitutes and similar fluids. The primary application is
31、expected to be in international custody transfer, where the reduction to a common basis of those physical attributes of a gas which describe both its quality and quantity will simplify the practice of world trade and commerce. 2 Normative reference The following standard contains provisions which, t
32、hrough reference in this text, constitute provisions of this International Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of app
33、lying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 6976:1995, Natural gas Calculation of calorific values, density, relative density and Wobbe index from composition. 3 Standard reference conditions
34、 The standard reference (or base) conditions of temperature, pressure and humidity (state of saturation) to be used for measurements and calculations carried out on natural gases, natural-gas substitutes and similar fluids in the gaseous state are 288,15 K and 101,325 kPa for the real dry gas. The p
35、hysical properties to which these ISO standard reference conditions apply include volume, density, relative density, compression factor, superior calorific value, inferior calorific value and Wobbe index. Full definitions of these quantities are given in ISO 6976:1995. In the cases of calorific valu
36、e and Wobbe index, both the volume of gas burned and the energy released by combustion shall relate to the ISO standard reference conditions. It is recognized, however, that in certain circumstances it may be impracticable or even unallowable to use the ISO standard reference conditions. For example
37、, national legislation or contractual obligations may demand the use of alternative reference conditions. For this reason, Annex A provides factors for conversion between several sets of metric reference conditions which are known to be in regular use, and Annex B gives equations which enable values
38、 of properties (relating to any other known reference conditions) to be converted to values for the ISO standard reference conditions. Annex D gives some example calculations. Annex E gives the metric reference conditions which, at present time, are believed to be those in most common usage in the c
39、ountries listed. NOTE 1Among other considerations, the ISO standard reference conditions have been chosen to conform with those standardized in ISO 50241 for use in the measurement of petroleum liquids and gases. NOTE 2288,15 K = 15 ?C = 59 ?F 101,325 kPa = 1,013 25 bar = 14,695 9 psia = 1 standard
40、atmosphere (atm) NOTE 3In ISO 6976:1995, a dry gas is defined as one for which the mole fraction of water vapour is less than 0,000 05, but this criterion is unnecessarily restrictive in the context of this International Standard, where a mole fraction of up to 0,001 may be allowable. NOTE 4The cond
41、itions 273,15 K, 101,325 kPa and 288,15 K, 101,325 kPa are commonly referred to as “normal” and “(metric) standard” conditions, respectively, in gas-measurement practice (see IGU/G-644, IGU/G-735 and IGU/G-766). This usage should not be confused with “NTP” (normal temperature and pressure) and “STP”
42、 (standard temperature and pressure), both of which conventionally refer to the former conditions. The definitions of “normal” and “standard” given in ISO 75042 conflict with the usage given above, and are incorrect. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov 19 15:55:31 GMT+00:00 2006, Unc
43、ontrolled Copy, (c) BSI EN ISO 13443:2005 2 BSI 21 March 2006 NOTE 5Good practice requires that the relevant reference conditions are incorporated as part of the symbol (and not the unit) for the physical quantity represented wherever ambiguity is possible. For example: use Z(273,15 K, 101,325 kPa)
44、or Z(t/?C = 0, p/atm: = 1), not Zn, for compression factor at “normal” conditions; use V(273,15 K, 101,325 kPa) m3 for the volume of gas in cubic metres at “normal” conditions, not mn3, m3(n), nm3 or Nm3, and certainly not simply m3; use V(t/?C = 15, p/kPa = 101,325) m3 for the volume of gas in cubi
45、c metres at “standard” conditions, not m3(st), sm3 or ms3. Abbreviated versions such as Z(0), V(0)/m3 and V(15)/m3, respectively, are acceptable when no misinterpretation is possible. In the latter case, V(ISO)/m3 is probably the best designation. Licensed Copy: sheffieldun sheffieldun, na, Sun Nov
46、19 15:55:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 13443:2005 BSI 21 March 20063 Annex A (normative) Factors for conversion between reference conditions To obtain the value of a property at the reference condition given in row b of Table A.1 from a known value in the same units at the ref
47、erence condition in row a, multiply by the factor indicated. To carry out the reverse conversion, divide by the factor indicated. Conversions for properties of the ideal gas are expected to be accurate to within 0,01 % for all natural gases. For the real-gas volumetric properties (volume per unit am
48、ount, density, relative density, compression factor), the expected accuracy is 0,02 %, and for the real-gas combustion properties (calorific values, Wobbe index) 0,05 %. Conversion factors for non-metric (e.g. Imperial) reference conditions are not provided, as the continued use of these particularl
49、y in international trade is discouraged. Most non-metric reference conditions use a temperature base of 60 ?F, but several distinct pressure bases have been invoked. Annex B provides equations which will allow the conversion of property values from reference conditions not shown in Table A.1 to equivalent values for the ISO standard reference conditions. In Table A.1, the pressure base for both combustion and volumetric metering is always