1、g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BRITISH STANDARDBS EN ISO 13443:2005IncorporatingAmendment No. 1 (renumbers BS ISO 13443:1996 as BS
2、EN ISO 13443:2005)Natural gas Standard reference conditionsThe European Standard EN ISO 13443:2005 has the status of a British StandardICS 75.060BS EN ISO 13443:2005This British Standard, having been prepared under the direction of the Sector Board for Materials and Chemicals, was published under th
3、e authority of the Standards Board and comes into effect on 15 April 1997 BSI 21 March 2006ISBN 0 580 27240 0National forewordThis 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
4、 its preparation was entrusted to Technical Committee PTI/15, Natural gas and gas 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 int
5、erests informed; monitor related international and European developments and promulgate them in the UK.A list of organizations represented on this committee can be obtained on request.Cross-referencesThe British Standards which implement international or European publications referred to in this doc
6、ument may be found in the BSI Catalogueunder the section entitled “International 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.
7、Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.Summary of pagesThis 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
8、 page, pages ii and iii, a blank page, pages 1 to 9 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date Comments16149 March 2006 Renumbers BS ISO 13443:1996 as BS EN ISO 13443:2005BS EN ISO
9、13443:2005 BSI 21 March 2006 iContentsPageNational foreword Inside front coverForeword iiiText of ISO 13443 1iiblankEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 13443May 2005ICS 75.060English versionNatural gas Standard reference conditions (ISO 13443:1996including Corrigendum 1:1997)Gaz na
10、turel Conditions de rfrence standard (ISO13443:1996, 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 EuropeanStandard the status of a nationa
11、l standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 oth
12、er language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, Fran
13、ce,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManage
14、ment Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 13443:2005: EForeword The text of ISO 13443:1996 has been prepared by Technical Committee ISO/TC 193, Natural gas, of the Inter
15、national 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 text or by endorsement, at the latest by November 2005, and conflicting national standar
16、ds 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 Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany
17、, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 13443:1996 has been approved by CEN as EN ISO 13443:2005 without any modifica
18、tions. EN ISO 13443:2005EN ISO 13443:2005EN ISO 13443:2005ii BSI 21 March 2006ContentsPageForeword iiiIntroduction 11Scope 12 Normative reference 13 Standard reference conditions 1Annex A (normative) Factors for conversion between reference conditions 3Annex B (informative) Equations for conversion
19、between reference conditions 5Annex C (normative) Symbols 7Annex D (informative) Example calculations 7Annex E (informative) National usage of reference conditions 8Annex F (informative) Bibliography 9Table A.1 Factors for conversion between reference conditions 4Table E.1 National usage of referenc
20、e conditions 9Descriptors: Natural gas, tests, measurement, computation, testing conditions.EN ISO 13443:2005 BSI 21 March 2006 iiiForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing Intern
21、ational 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 be represented on that committee. International organizations, governmental and non-governmental, in liaison with
22、 ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an I
23、nternational 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 gas.Annex A and Annex C form an integral part of this International Standard. Annex B, Annex D, Annex E and Annex F ar
24、e for information only.blankEN ISO 13443:2005 BSI 21 March 2006 1IntroductionThe 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 cause much confusion. Failure to take
25、 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 employ identical terminology, irr
26、espective 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 ISO standard reference conditions
27、.1 ScopeThis 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 expected to be in international custo
28、dy 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 referenceThe following standard contains provisions which, through reference in this text, constitu
29、te 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 applying the most recent edition of the st
30、andard 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 conditionsThe standard reference (or base) conditi
31、ons 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 physical properties to which these ISO stan
32、dard 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 value and Wobbe index, both the volume of gas
33、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, national legislation or contractual oblig
34、ations 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 of properties (relating to any other known
35、 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 countries listed.NOTE 1 Among other consider
36、ations, the ISO standard reference conditions have been chosen to conform with those standardized in ISO 50241for use in the measurement of petroleum liquids and gases.NOTE 2 288,15 K = 15 C=59F101,325 kPa = 1,013 25 bar = 14,695 9 psia = 1 standard atmosphere (atm)NOTE 3 In ISO 6976:1995, a dry gas
37、 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 4 The conditions 273,15 K, 101,325 kPa and 288,15 K, 101,325
38、 kPa are commonly referred to as “normal” and “(metric) standard” conditions, respectively, in gas-measurement practice (see IGU/G-644, IGU/G-735and IGU/G-766). This usage should not be confused with “NTP” (normal temperature and pressure) and “STP” (standard temperature and pressure), both of which
39、 conventionally refer to the former conditions. The definitions of “normal” and “standard” given in ISO 75042conflict with the usage given above, and are incorrect.EN ISO 13443:20052 BSI 21 March 2006NOTE 5 Good practice requires that the relevant reference conditions are incorporated as part of the
40、 symbol (and not the unit) for the physical quantity represented wherever ambiguity is possible. For example: use Z(273,15 K, 101,325 kPa) or Z(t/C=0,p/atm: = 1), not Zn, for compression factor at “normal” conditions; use V(273,15 K, 101,325 kPa) m3for the volume of gas in cubic metres at “normal” c
41、onditions, not mn3, m3(n), nm3or Nm3, and certainly not simply m3; use V(t/C = 15, p/kPa = 101,325) m3for the volume of gas in cubic metres at “standard” conditions, not m3(st), sm3or ms3.Abbreviated versions such as Z(0), V(0)/m3and V(15)/m3, respectively, are acceptable when no misinterpretation i
42、s possible. In the latter case, V(ISO)/m3is probably the best designation.EN ISO 13443:2005 BSI 21 March 2006 3Annex A (normative) Factors for conversion between reference conditionsTo obtain the value of a property at the reference condition given in row b of Table A.1 from a known value in the sam
43、e units at the reference 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 (v
44、olume per unit amount, 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 t
45、hese particularly 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 Ta
46、ble 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 101,325 kPa and the gas is taken to be dry.EN ISO 13443:20054 BSI 21 March 2006Table A.1 Factors for conversion between reference conditionsMet
47、ering t2/C Combustion t1/Ca fi 20 20 15 25 25 25 20 20 15to to to to to to to to tob fi 15 00 00 20 15 00 15 00 001 Ideal volume 0,982 9 0,931 8 0,947 92 Ideal density 1,017 4 1,073 2 1,054 93 Ideal relative density 1,000 0 1,000 0 1,000 04 Compression factor 0,999 9 0,999 5 0,999 65 Real volume 0,9
48、82 8 0,931 3 0,947 66 Real density 1,017 5 1,073 8 1,055 37 Real relative density 1,000 1 1,000 3 1,000 28 Molar-basis ideal superior calorific value 1,000 5 1,001 0 1,002 6 1,000 5 1,002 1 1,001 69 Molar-basis ideal inferior calorific value 1,000 1 1,000 1 1,000 3 1,000 0 1,000 2 1,000 210 Mass-bas
49、is ideal superior calorific value 1,000 5 1,001 0 1,002 6 1,000 5 1,002 1 1,001 611 Mass-basis ideal inferior calorific value 1,000 1 1,000 1 1,000 3 1,000 0 1,000 2 1,000 212 Molar-basis real superior calorific value 1,000 5 1,001 0 1,002 6 1,000 5 1,002 1 1,001 613 Molar-basis real inferior calorific value 1,000 1 1,000 1 1,000 3 1,000 0 1,000 2 1,000 214 Mass-basis real superior calorific value 1,000 5 1,001 0 1,002 6 1,000 5 1,002 1 1,001 615 Mass-basis real inferior calorific value 1,000 1 1,000 1 1,000 3 1,00
