1、January 2010DEUTSCHE NORM English price group 17No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 75.060!$Tl“1564973www.
2、din.deDDIN EN ISO 12213-3Natural gas Calculation of compression factor Part 3: Calculation using physical properties (ISO 12213-3:2006)English version of DIN EN ISO 12213-3:2010-01Erdgas Berechnung von Realgasfaktoren Teil 3: Berechnungen basierend auf physikalischen Stoffeigenschaften alsEingangsgr
3、en (ISO 12213-3:2006)Englische Fassung DIN EN ISO 12213-3:2010-01SupersedesDIN EN ISO 12213-3:2005-09www.beuth.deDocument comprises pages43DIN EN ISO 12213-3:2010-01 National foreword This standard has been prepared by Technical Committee ISO/TC 193 “Natural gas”, Subcommittee SC 1 “Analysis of natu
4、ral gas” (Secretariat: NEN, Netherlands). The responsible German body involved in its preparation was the Normenausschuss Materialprfung (Materials Testing Standards Committee), Working Committee NA 062-05-73 AA Gasanalyse und Gasbeschaffenheit. The DIN Standards corresponding to the International S
5、tandards referred to in this document are as follows: ISO 6976 DIN EN ISO 6976 ISO 12213-1 DIN EN ISO 12213-1 Amendments This standard differs from DIN EN ISO 12213-3:2005-09 as follows: a) Subclause 4.4.1 “Pipeline quality gas” has been revised. b) Annex E “Specification for pipeline quality natura
6、l gas” has been added. Previous editions DIN EN ISO 12213-3: 2005-09 National Annex NA (informative) Bibliography DIN EN ISO 6976, Natural gas Calculation of calorific values, density, relative density and Wobbe index from composition DIN EN ISO 12213-1, Natural gas Calculation of compression factor
7、 Part 1: Introduction and guidelines 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 12213-3 September 2009 ICS 75.060 Supersedes EN ISO 12213-3:2005English Version Natural gas - Calculation of compression factor - Part 3: Calculation using physical properties (ISO 12213-3:2006) Gaz natur
8、el - Calcul du facteur de compression - Partie 3: Calcul partir des caractristiques physiques (ISO 12213-3:2006) Erdgas - Berechnung von Realgasfaktoren - Teil 3: Berechnungen basierend auf physikalischen Stoffeigenschaften als Eingangsgren (ISO 12213-3:2006) This European Standard was approved by C
9、EN on 13 August 2009. 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. Up-to-date lists and bibliographical references concerning such national standard
10、s may be obtained on application to the CEN Management Centre 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 under the responsibility of a CEN member into its own language and notified to t
11、he CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Neth
12、erlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation
13、 in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 12213-3:2009: EContents Page Foreword 3 1 Scope . 4 2 Normative references . 4 3 Terms and definitions. 4 4 Method of calculation. 5 4.1 Principle. 5 4.2 The SGERG-88 equation 5 4.3 Input variables. 6 4.4 Rang
14、es of application. 6 4.5 Uncertainty 8 5 Computer program . 9 Annex A (normative) Symbols and units. 10 Annex B (normative) Description of the SGERG-88 method. 13 Annex C (normative) Example calculations 24 Annex D (normative) Conversion factors 25 Annex E (informative) Specification for pipeline qu
15、ality natural gas . 28 Annex F (informative) Performance over wider ranges of application . 31 Annex G (informative) Subroutine SGERG.FOR in Fortran . 36 Bibliography . 41 EN ISO 12213-3:2009 (E) DIN EN ISO 12213-3:2010-01 2.Foreword The text of ISO 12213-3:2006 has been prepared by Technical Commit
16、tee ISO/TC 193 “Natural gas” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 12213-3:2009. 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 March 2010,
17、 and conflicting national standards shall be withdrawn at the latest by March 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. Th
18、is document supersedes EN ISO 12213-3:2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany
19、, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 12213-3:2006 has been approved by CEN as a EN ISO 12213-3:2009 w
20、ithout any modification. EN ISO 12213-3:2009 (E) DIN EN ISO 12213-3:2010-01 31 Scope ISO 12213 specifies methods for the calculation of compression factors of natural gases, natural gases containing a synthetic admixture and similar mixtures at conditions under which the mixture can exist only as a
21、gas. This part of ISO 12213 specifies a method for the calculation of compression factors when the superior calorific value, relative density and carbon dioxide content are known, together with the relevant pressures and temperatures. If hydrogen is present, as is often the case for gases with a syn
22、thetic admixture, the hydrogen content also needs to be known. NOTE In principle, it is possible to calculate the compression factor when any three of the parameters superior calorific value, relative density, carbon dioxide content (the usual three) and nitrogen content are known, but subsets inclu
23、ding nitrogen content are not recommended. The method is primarily applicable to pipeline quality gases within the ranges of pressure p and temperature T at which transmission and distribution operations normally take place, with an uncertainty of about 0,1 %. For wider-ranging applications the unce
24、rtainty of the results increases (see Annex F). More detail concerning the scope and field of application of the method is given in ISO 12213-1. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition ci
25、ted applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 6976:1995, Natural gas Calculation of calorific values, density, relative density and Wobbe index from composition ISO 12213-1, Natural gas Calculation of compression factor Par
26、t 1: Introduction and guidelines ISO 80000-4, Quantities and units Part 4: Mechanics ISO 80000-5, Quantities and units Part 5: Thermodynamics 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 12213-1 apply. EN ISO 12213-3:2009 (E) DIN EN ISO 12213-3:20
27、10-01 44 Method of calculation 4.1 Principle The method recommended uses equations which are based on the concept that pipeline quality natural gas may be uniquely characterized for calculation of its volumetric properties by an appropriate and distinctive set of measurable physical properties. Thes
28、e characteristics, together with the pressure and temperature, are used as input data for the method. The method uses the following physical properties: superior calorific value, relative density and carbon dioxide content. The method is particularly useful in the common situation where a complete m
29、olar composition is not available, but may also be preferred for its relative simplicity. For gases with a synthetic admixture, the hydrogen content needs to be known. 4.2 The SGERG-88 equation The calculation method using physical properties is based on the standard GERG 88 (SGERG-88) virial equati
30、on for natural gases1, 2, 3. The standard GERG 88 virial equation is derived from the master GERG 88 (MGERG-88) virial equation, which is a method of calculation based on a molar-composition analysis4. The SGERG-88 virial equation from which the compression factor Z is calculated may be written as 1
31、ZBC =+ +2mm(1) where B and C are functions of the input data comprising the superior calorific value HS, the relative density d, the contents of both inert and combustible non-hydrocarbon components of the gas mixture (CO2and H2) and the temperature T; mis the molar density given by ( )p ZRT =m(2) w
32、here Z = f1(p, T, HS, d, xCO2, xH2) (3) However, the SGERG-88 method treats the natural-gas mixture internally as a five-component mixture consisting of an equivalent hydrocarbon gas (with the same thermodynamic properties as the sum of the hydrocarbons present), nitrogen, carbon dioxide, hydrogen a
33、nd carbon monoxide. To characterize the thermodynamic properties of the hydrocarbon gas adequately, the hydrocarbon heating value HCHis also needed. Therefore, the calculation of Z uses Z = f2(p, T, HCH, xCH, xN2, xCO2, xH2, xCO) (4) In order to be able to model coke oven gas mixtures, the mole frac
34、tion of carbon monoxide is taken to have a fixed relation to the hydrogen content. If hydrogen is not present (xH20,55 0,97 0,45dxx+22CO H(B.43)b) The intermediate calculated value for the mole fraction of nitrogen shall satisfy the following conditions: 0,01 0,5x uu2N(B.44) 0,5xx+ u22NCO(B.45) c) F
35、urthermore, the internal consistency of the input data for the third iteration loop shall satisfy the condition: 0,55 0,4 0,97 0,45dxxx+ + 222NCOH(B.46)EN ISO 12213-3:2009 (E) DIN EN ISO 12213-3:2010-01 23Annex C (normative) Example calculations The following example calculations shall be used for t
36、he validation of computer implementations of the SGERG-88 method not cited in Annex B. The calculations have been carried out using the validated executable programme GERG-88.EXE, which incorporates the subroutine SGERG.FOR described in Annex B. Table C.1 Input data Gas 1 Gas 2 Gas 3 Gas 4 Gas 5 Gas
37、 6 xCO20,006 0,005 0,015 0,016 0,076 0,011 xH20,000 0,000 0,000 0,095 0,000 0,000 d 0,581 0,609 0,650 0,599 0,686 0,644 HS(MJm3) 40,66 40,62 43,53 34,16 36,64 36,58 Table C.2 Results (Z-values) Conditions Gas 1 Gas 2 Gas 3 Gas 4 Gas 5 Gas 6 p bar t C 60 3,15 0,840 84 0,833 97 0,794 15 0,885 69 0,826
38、 64 0,854 06 60 6,85 0,862 02 0,856 15 0,822 10 0,901 50 0,850 17 0,873 88 60 16,85 0,880 07 0,875 00 0,845 53 0,915 07 0,870 03 0,890 71 60 36,85 0,908 81 0,904 91 0,882 23 0,936 84 0,901 24 0,917 36 60 56,85 0,929 96 0,926 90 0,908 93 0,953 02 0,923 94 0,936 90 120 3,15 0,721 46 0,711 40 0,643 22
39、0,808 43 0,695 57 0,749 39 120 6,85 0,759 69 0,750 79 0,690 62 0,836 13 0,738 28 0,784 73 120 16,85 0,792 57 0,784 72 0,731 96 0,859 99 0,774 63 0,814 90 120 36,85 0,844 92 0,838 77 0,797 78 0,898 27 0,831 66 0,862 66 120 56,85 0,883 22 0,878 32 0,845 54 0,926 62 0,872 69 0,897 49 These gases are th
40、e same as the six gases in ISO 12213-2:2006, Annex C, where the complete molar compositions are given. EN ISO 12213-3:2009 (E) DIN EN ISO 12213-3:2010-01 24Annex D (normative) Conversion factors D.1 Reference conditions The reference conditions for which the standard GERG 88 virial equation was deve
41、loped and which the SGERG.FOR computer subroutine uses internally are Calorific value by combustion at T1= 298,15 K (t1= 25 C) p = 101,325 kPa gas metered at T2= 273,15 K (t2= 0 C) p = 101,325 kPa The latter set of conditions are also the reference conditions for relative density. Considerable care
42、is needed to ensure that correctly referenced inputs are used for calorific value and relative density. Several countries normally use the above conditions, but others use alternative conditions. This can easily cause confusion, particularly since the unit of calorific-value measurement in each case
43、 may still be MJm3. Table D.1 is a guide to which of the major international gas-trading countries use which reference conditions. For those using non-metric units for calorific value (i.e. Btuft3), conversion both of units and of reference conditions is required. The conversion factors used are tak
44、en from Reference 3. Table D.1 Nationally adopted metric reference conditions for the measurement of calorific value t1(C) t2(C) Australia Austria Belgium Canada Denmark France Germany Ireland Italy Japan Netherlands Russia United Kingdom United States of America 15 25 25 15 25 0 25 15 25 0 25 25 15
45、 15 15 0 0 15 0 0 0 15 0 0 0 0 or 20 15 15 NOTE 1 In all countries the reference pressure is 101,325 kPa (= 1,013 25 bar). NOTE 2 t1is the combustion reference temperature. NOTE 3 t2is the gas-metering reference temperature. EN ISO 12213-3:2009 (E) DIN EN ISO 12213-3:2010-01 25D.2 Units and conversi
46、on factors for pressure and temperature If the input variables p and t are not in the necessary units of bar and C, then conversions must be made in order to use the Fortran implementation. A selection of appropriate conversion factors is given in Table D.2. Table D.2 Conversion factors for pressure
47、 and temperature Pressure p (bar) = p(kPa)/100 p (bar) = p(MPa) 10 p (bar) = p(atm) 1,013 25 p (bar) = p(psia)/14,503 8 p (bar) = p(psig) + 14,695 9/14,503 8 Temperature t (C) = T(K) 273,15 t (C) = t(F) 32/1,8 t (C) = t(R)/1,8 273,15 D.3 Units and conversion of calorific value and density between re
48、ference conditions Because both superior calorific value and relative density are functions of the composition of a gas mixture, and because the thermophysical properties of the individual components depend upon temperature and pressure in individual ways, it is in principle impossible (without know
49、ledge of the composition) to convert the calorific value and the relative density known at one set of reference conditions to exact corresponding values for any other set of reference conditions. However, because the relevant reference conditions are always thermodynamically close together, and because natural gases do not vary in their composition to any major extent, it is possible in practice to give conversion factors which may be applied to any typical natural gas with e
