1、BS ISO15970:2008ICS75.060;75.180.30NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWBRITISH STANDARDNaturalgas Measurementof properties Volumetric properties:density, pressure,temperature andcompressionfactorBS EN ISO 15970:2014BS EN ISO 15970:2014ISBN 978 0 580 83400 4Amendments/corrigen
2、da issued since publicationDate Comments31 May 2014 This corrigendum renumbers BS ISO 15970:2008 as BS EN ISO 15970:2014This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2008 The British Standards Institution 2014. Published by BSI S
3、tandards Limited 2014National forewordThis British Standard is the UK implementation of EN ISO 15970:2014. It is identical to ISO 15970:2008. It supersedes BS ISO 15970:2008 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PTI/15, Natural Gas and Gas An
4、alysis.A list of organizations represented on this committee can be obtained on request to its secretary.The publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity
5、 from legal obligations.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 15970 March 2014 ICS 75.060; 75.180.30 English Version Natural gas - Measurement of properties - Volumetric properties: density, pressure, temperature and compression factor (ISO 15970:2008) Gaz naturel - Mesurage des c
6、aractristiques - Caractristiques volumtriques: masse volumique, pression, temprature et facteur de compression (ISO 15970:2008) Erdgas - Messung der Eigenschaften - Volumetrische Eigenschaften: Dichte, Druck, Temperatur und Kompressibilittsfaktor (ISO 15970:2008) This European Standard was approved
7、by CEN on 16 February 2014. 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 st
8、andards may be obtained on application to the CEN-CENELEC 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
9、 notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungar
10、y, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELE
11、C Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 15970:2014 EEN ISO 15970:2014 (E) 3 Foreword The text of ISO 15970:2008 has been prepared by Technical Committee ISO/TC
12、 193 “Natural gas” of the International Organization for Standardization (ISO) and has been taken over as EN ISO 15970:2014. 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 September 2014, and con
13、flicting national standards shall be withdrawn at the latest by September 2014. 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. Accord
14、ing to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,
15、Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 15970:2008 has been approved by CEN as EN ISO 15970:2014 w
16、ithout any modification. BS EN ISO 15970:2014EN ISO 15970:2014 (E)BS ISO 15970:2008ISO 15970:2008(E) ISO 2008 All rights reserved iiiContents PageForeword. vIntroduction. vi1Scope. 12Normative references. 13Terms and definitions. 23.1 Terms and definitions for density at reference conditions 23.2 Te
17、rms and definitions for density at operating conditions 23.3 Terms and definitions for pressure 33.4 Terms and definitions for temperature. 43.5 Terms and definitions for compression factor 44Symbols and units 44.1 Symbols and subscripts for density at reference conditions 44.2 Symbols and subscript
18、s for density at operating conditions 54.3 Symbols and subscriptsfor compression factor 55Density at reference conditions 65.1 Principle of measurement65.2 Performance assessment and acceptance tests. 105.3 Sampling and installation guidelines . 115.4 Calibration. 115.5 Verification 115.6 Maintenanc
19、e 125.7 Quality control. 126Density at operating conditions 126.1 Principle of measurement 126.2 Performance assessment and acceptance tests. 136.3 Sampling and installation guidelines . 166.4 Calibration. 206.5 Verification 206.6 Maintenance 216.7 Quality control. 217Pressure. 217.1 Principle of me
20、asurement 227.2 Performance assessment and acceptance tests. 247.3 Sampling and installation guidelines . 247.4 Calibration. 277.5 Verification 287.6 Maintenance 287.7 Quality control. 298Temperature 298.1 Principle of measurement 298.2 Performance assessment and acceptance tests. 308.3 Installation
21、 guidelines 318.4 Calibration. 338.5 Verification 348.6 Maintenance 348.7 Quality control. 349Compression factor 34BS ISO 15970:2008ISO 15970:2008(E) ISO 2008 All rights reserved iiiContents PageForeword. vIntroduction. vi1Scope .2Normative references. 13Terms and definitions. 23.1 Terms and definit
22、ions for density at reference conditions 23.2 Terms and definitions for density at operating conditions 23.3 Terms and definitions for pressure 33.4 Terms and definitions for temperature. 43.5 Terms and definitions for compression factor4Symbols and units 44.1 Symbols and subscripts for density at r
23、eference conditions 44.2 Symbols and subscripts for density at operating conditions 54.3 Symbols and subscriptsfor compression factor 55Density at reference conditions 65.1 Principle of measurement65.2 Performance assessment and acceptance tests. 105.3 Sampling and installation guidelines . 115.4 Ca
24、libration. 115.5 Verification 115.6 Maintenance 125.7 Quality control.6Density at operating conditions 126.1 Principle of measurement 126.2 Performance assessment and acceptance tests. 136.3 Sampling and installation guidelines . 166.4 Calibration. 206.5 Verification 206.6 Maintenance 216.7 Quality
25、control.7Pressure. 217.1 Principle of measurement 227.2 Performance assessment and acceptance tests. 247.3 Sampling and installation guidelines . 247.4 Calibration. 277.5 Verification 287.6 Maintenance 287.7 Quality control.8Temperature 298.1 Principle of measurement 298.2 Performance assessment and
26、 acceptance tests. 308.3 Installation guidelines 318.4 Calibration. 338.5 Verification 348.6 Maintenance 348.7 Quality control.9Compression factor 34l BS EN ISO 15970:2014ISO 15970:2008(E)BS ISO 15970:2008ISO 15970:2008(E)iv ISO 2008 All rights reserved9.1 Principle of measurement349.2 Working princ
27、iple359.3 Performance assessment and acceptance tests.389.4 Sampling and installation guidelines389.5 Calibration399.6 Verification.409.7 Maintenance.409.8 Quality control.40Annex A (informative) Guidance for instrument selection, instrument test and operational procedures.41Annex B (informative) In
28、strument documentation45Bibliography.47BS EN ISO 15970:2014ISO 15970:2008(E)BS ISO 15970:2008ISO 15970:2008(E) ISO 2008 All rights reserved vForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of prepa
29、ring International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has beenestablished has the right to be represented on that committee. International organizations, governmental and non-governmental, in li
30、aison with ISO, also take part in the work. ISO collaborates closelywith the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.The main task of t
31、echnical committees is to prepare International Standards. Draft International Standardsadopted 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. Attention is dr
32、awn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 15970 was prepared by Technical Committee ISO/TC 193, Natural gas. BS ISO 15970:2008ISO 15970:2008(E)vi ISO 2008
33、 All rights reservedIntroduction The transmission of natural gas can involve passage across national boundaries; at border stations and elsewhere, knowledge of the physicochemical properties of the fluid is of great operational and economicimportance. The energy flow and properties of the gas are re
34、quired at several stages of the overall productioand custody transfer process: production, blending, transmission, metering, distribution and supply. International standardization of the performance specifications for various types ofmeasuring instruments canfacilitate comparison of, and increase co
35、nfidence in, measurement results for contracting partners. In manycases, it is possible to calculate the properties of natural gaswith sufficient accuracy, given the composition. However, it is often also possible to measure the property using techniques that do not require acompositional analysis f
36、or their implementation. This International Standard considers only those methods for determining physical properties of natural gas that do not rely upon a detailed component analysis of the gas. Such measurements consider the “whole”sample of the gas. This International Standard defines performanc
37、e characteristics necessary to specifyinstrumentation formeasurement of some natural gas properties. It provides guidelines for the installation, traceable calibration,performance, operation, maintenance and acceptance testing of these measurement instruments.The principle ofmeasurement of various p
38、roperties included in this International Standard is typical for anumber of applications. It is required that the calibration of the instruments dealt with in this International Standard be traceable tonational standards orInternational Standards. It is required that the measuring instruments, inclu
39、ding their installation and the devices used for fieldcalibration, verification and maintenance comply with local legal regulations on application in hazardous areas.Annex A presents general guidelines for instrument selection, instrument test and operational procedures of the instruments considered
40、 in this International Standard. Annex B lists the data of particular importance for the instrument documentation. BS EN ISO 15970:2014ISO 15970:2008(E)blankBS ISO 15970:2008INTERNATIONAL STANDARD ISO 15970:2008(E) ISO 2008 All rights reserved 1Natural gas Measurementofproperties Volumetric properti
41、es: density, pressure, temperature and compression factor 1 Scope This international Standard gives requirements and procedures for the measurement of the properties ofnatural gas that are usedmainly for volume calculation and volume conversion: density at reference andat operating conditions, press
42、ure, temperature and compression factor. Only those methods and instruments are considered that are suitable for field operation under the conditionsof natural gas transmission and distribution, installed either in-line or on-line, and that do not involve thedetermination of the gas composition. Thi
43、s International Standard gives examples for currentlyused instruments that are available commerciallyand of interest to the natural gas industry.NOTE Attention is drawn to requirements for approval of national authorization agencies and to national legalregulations for the use of these devices for c
44、ommercial or official trade purposes. The densityat reference conditions (sometimes referred to as normal, standard or even base density) isrequired for conversion of volume data and can be used for other physical properties. Density at operating conditions is measured formass-flow measurement and v
45、olume conversion using the observed line density and can be used for other physical properties. This International Standard coversdensity transducers based on vibrating elements, normally suitable for measuring ranges of 5 kg/m3to 250 kg/m3. Pressure measurement deals with differential, gauge and ab
46、solute pressure transmitters. It considers bothanalogue and smart transmitters (i.e. microprocessor based instruments) and, if not specified otherwise, the corresponding paragraphs refer to differential, absolute and gauge pressure transmitters without distinction. Temperature measurements in natura
47、l gas are performed within the range of conditions under whichtransmission and distribution are normally carried out (253 K 99,95 %) or reference gas mixtures. One of the gases shall have a densityat reference conditions which is in the range of that of the operating gasand, for vibrating elements,
48、the same applies for Zn/Z and the velocity of sound. Balance systems, which are very sensitive to environmental influences, shall be carefullytested and calibratedon site. Vibrating element systems, which are relatively robust, may be calibrated in a laboratory or on site.However,as the calibration
49、curve constants for vibrating elements depend on the gas in the referencechamber, for those reference chambers that are refilled on site, a recalibration on site is required. A minimum calibration interval is one year, but shall not exceed five years. The user shall consider theinstruments accuracy during operations and its financial impact on the results.5.5 Verification Verification of the correct operation and accuracy shall be performed at regular intervals by connecting the system to a reference gas that has operating properties similar to those
