SIST EN ISO 13443:2005

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Erdgas - Standardbezugsbedingungen (ISO
13443:1996)Gaz naturel - Conditions de référence standard (ISO 13443:1996, Corrigendum 1:1997 inclus)Natural gas - Standard reference conditions (ISO 13443:1996 including Corrigendum 1:1997)75.060Zemeljski plinNatural gasICS:Ta slovenski standard je istoveten z:EN ISO 13443:2005SIST EN ISO 13443:2005en01-julij-2005SIST EN ISO 13443:2005SLOVENSKI
STANDARD



SIST EN ISO 13443:2005



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN ISO 13443May 2005ICS 75.060English versionNatural gas - Standard reference conditions (ISO 13443:1996including Corrigendum 1:1997)Gaz naturel - Conditions de référence 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 national 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 other 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, France,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 STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 13443:2005: ESIST EN ISO 13443:2005



EN ISO 13443:2005 (E)
2
Foreword
The text of ISO 13443:1996 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 text 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 Standard: 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 text of ISO 13443:1996 has been approved by CEN as EN ISO 13443:2005 without any modifications.
SIST EN ISO 13443:2005



INTERNATIONAL STANDARD IS0 13443 First edition 1996-l 2-l 5 Natural gas - Standard reference conditions Gaz nature/ - Conditions de r@f&-ence standard Reference number IS0 13443:1996(E) SIST EN ISO 13443:2005



IS0 13443:1996(E) Contents Page Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*. iv 1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Normative reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 Standard reference conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Annexes A Factors for conversion between reference conditions. . 3 B Equations for conversion between reference conditions. . 5 C Symbols . 7 D Example calculations . 8 E National usage of reference conditions . 10 F Bibliography . 11 0 IS0 1996 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland ii SIST EN ISO 13443:2005



@ IS0 IS0 13443:1996(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 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 ISO, also take part in the work. IS0 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 International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 13443 was prepared by Technical Committee lSO/TC 193, Natural gas. Annexes A and C form an integral part of this International Standard. Annexes B, D, E and F are for information only. . . . III SIST EN ISO 13443:2005



IS0 13443:1996(E) @ IS0 Introduction The multiplicity of so-called “standard reference conditions” of tempera- ture, pressure and humidity (state of saturation) used in the measurement of natural-gas quality and quantity can cause 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 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 IS0 stan- dard reference conditions. IV SIST EN ISO 13443:2005



INTERNATIONAL STANDARD 0 IS0 IS0 13443:1996(E) Natural gas - 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 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, through 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 applying the most recent edition of the standard indicated below. Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 6976: 1995, Natural gas - Calculation of calorific values, density, relative density and Wobbe index from composition. 3 Standard reference conditions 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 physical properties to which these IS0 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 IS0 6976:1995. In the cases of calorific value and Wobbe index, both the volume of gas burned and the energy released by combustion shall relate to the IS0 standard reference conditions. It is recognized, however, that in certain circumstances it may be impracticable or even unallowable to use the IS0 standard reference conditions. For example, 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 of properties (relating to any other known reference conditions) to be converted to values for the IS0 SIST EN ISO 13443:2005



IS0 13443:1996(E) 0 IS0 standard r ,eferen ce conditio ns. Ann ex D gives some conditions which I at present tim e, ar .e bel eved t o be th example ose In m calcu lations. Annex E ost co mmon usage in t gi he ves the m etric cou ntrie sl isted. reference NOTES 1 Among other considerations, the IS0 standard reference conditions have been chosen to conform with those standardized in IS0 5024f~~ for use in the measurement of petroleum liquids and gases. 2 288,15 K = 15 “C = 59 “F 101,325 kPa = 1 ,013 25 bar = 14,695 9 psia = 1 standard atmosphere (atm) 3 In IS0 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. 4 The conditions 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-64[41, lGU/G-73 151 and lGU/G-76 [61). This usage should not be confused with “NTP” (normal temperature and pressure) and “STP” (standard temperature and pressure), both of which conventionally refer to the former conditions. The definitions of “normal” and “standard” given in IS0 7504[*1 conflict with the usage given above, and are incorrect. 5 Good 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 2(273,15 K, 101,325 kPa) or Z(t/“C = 0, p/atm = I), not Z,, for compression factor at “normal” conditions; - use V(273,15 K, 101,325 kPa) ms for the volume of gas in cubic metres at “normal” conditions, not m,s, ms(n), nms or Nms, and certainly not simply ms; - use V(t/OC = 15, p/kPa= 101,325) m3 for the volume of gas in cubic metres at “standard” conditions, not ms(st), sms or m,J. Abbrevia ted versions such as Z(O), V(O)/m3 and V(l5)/ms, respectively, are acceptable when no misinterpretation is possible. In the latter case, V(ISO)/m3 is probably the best designation. SIST EN ISO 13443:2005



IS0 13443:1996(E) 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 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,Ol % for all natural gases. For the real-gas volumetric properties (volume per unit amount, density, relative density, compression factor), the expected accuracy is - 0,02 %, and for the real-gas combustion properties (calorific v
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