1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Gas meters - Turbine gas metersBS EN 12261:2018National forewordThis British Standard is the UK implementation of EN 12261:2018. It supersedes BS EN 12261:2002, which is withdrawn.The UK participation in its preparation
2、 was entrusted to Technical Committee GSE/25, Gas Meters.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The B
3、ritish Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 97643 8ICS 17.120.10Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 Ap
4、ril 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 12261:2018EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12261March 2018ICS 91.140.40 Supersedes EN 12261:2002EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR N
5、ORMUNGCEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CEN Ref. No. EN 12261:2018: EAll rights of exploitation in any form and by any means reserved worldwide for CEN national MembersGas meters - Turbine gas metersCompteurs de gaz - Compteurs de gaz turbine Gaszhler - Turbinenra
6、dgaszhlerThis European Standard was approved by CEN on 9 November 2017.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 bibliograph
7、ical references concerning such national standards 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
8、 of a CEN member into its own language and 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 M
9、acedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.English VersionEN 12261:2018 (E)European foreword 41 Scope . 52
10、 Normative references 53 Terms, definitions and symbols 63.1 Terms and definitions . 63.2 Symbols . 84 Meter classification 94.1 Flange pressure ratings . 94.2 Gas meter sizes, rangeability and connection diameter sizes 94.3 Connections and dimensions . 114.4 Temperature ranges 114.5 Climatic enviro
11、nment . 115 Metrological performance requirements 115.1 General 115.2 Type testing 125.2.1 Error of indication .125.2.2 Metrological stability 135.2.3 Linearity . 135.2.4 Endurance .145.2.5 Meter position .145.2.6 Temporary overload 155.2.7 Temperature range .155.2.8 Installation conditions .165.2.9
12、 Maximum permissible pressure loss .165.2.10 Output shaft (where fitted) 176 Design and material requirements 176.1 General 176.2 Robustness 186.2.1 General. 186.2.2 Meter casing 186.2.3 Resistance to internal pressure 186.2.4 External leak tightness 196.2.5 Bending and torsional moment . 206.2.6 Re
13、sistance to impact 226.2.7 Transportation and storage . 226.3 Resistance to environmental conditions . 226.3.1 General. 226.3.2 Resistance to ultra-violet radiation 226.3.3 Resistance to external corrosion .236.4 Removable meter mechanisms 256.4.1 Integrity 256.4.2 Performance . 266.5 Indicating dev
14、ices and accessories . 266.5.1 General. 266.5.2 Magnetic drive units 276.6 Pressure and temperature tappings 276.6.1 Pressure tappings 276.6.2 Temperature tappings 286.7 Lubrication 286.7.1 Requirements 286.7.2 Type test . 287 Meter output 292Contents PageBS EN 12261:2018EN 12261:2018 (E)7.1 General
15、 297.2 Indicating device 297.2.1 General. 297.2.2 Capacity 297.2.3 Unit of indication 297.2.4 Readability . 297.2.5 Adjustment .307.3 Pulse generator 307.3.1 General. 307.3.2 Electrical specifications for pulse generators 307.3.3 Electrical connections 317.4 Output shaft 317.5 Test element . 327.5.1
16、 General provisions.327.5.2 Test element in case of mechanical indicating device 327.5.3 Pulse generator used as test element .328 Marking .328.1 General 328.2 Data plate 328.3 Direction of flow . 338.4 Working position 338.5 Other connections . 338.5.1 General. 338.5.2 Pressure tappings 338.5.3 Pul
17、se generators 338.5.4 Output shafts 339 Documentation 349.1 General 349.2 Declaration of conformity. 349.3 Instruction manual . 34Annex A (normative) Test facility specifications 35Annex B (normative) Perturbation testing .36Annex C (informative) Recommendations for use .41Annex D (normative) Indivi
18、dual factory testing 42Annex E (normative) Metrological requirements and tests for each meter prior to dispatch (Individual meter testing) .43Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2014/32/EU Measuring Instruments Directive a
19、imed to be covered 47Bibliography .52 ISO ISO pub-date year All rights reserved 3BS EN 12261:2018EN 12261:2018 (E)European forewordThis document (EN 12261:2018) has been prepared by Technical Committee CEN/TC 237 “Gas meters“, the secretariat of which is held by BSI.This European Standard shall be g
20、iven the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2018, and conflicting national standards shall be withdrawn at the latest by September 2018.Attention is drawn to the possibility that some of the elements of this documen
21、t may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.This document supersedes EN 12261:2002.This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports
22、essential requirements of EU Directive(s).For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.In the preparation of this European Standard, the content of ISO 9951, the content of OIML Publication, “International Recommendation 6“ and “Internat
23、ional Recommendation 32“ and the content of member bodies national standards on turbine meters have been taken into account.The metrological aspects of this European Standard may be subject to amendments to bring it into line with the proposed Measuring Instruments Directive (MID).Electronic Indexes
24、 are not specifically covered by this standard, however, work to produce a standard covering these devices is in progress under CEN/TC 237.According to the CEN-CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard:
25、 Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia,
26、 Spain, Sweden, Switzerland, Turkey and the United Kingdom.4BS EN 12261:2018EN 12261:2018 (E)1 ScopeThis document specifies the measuring conditions, requirements and tests for the construction, performance and safety of class 1,0 axial and radial turbine gas meters with mechanical indicating device
27、s, herein after referred to as a meter(s), having in-line pipe connections for gas flow measurement.This document applies to turbine gas meters used to measure the volume of fuel gases of the 1stand 2ndgas families, the composition of which is specified in EN 437, at maximum working pressures up to
28、420 bar, actual flow rates up to 25 000 m3/h over a gas temperature range of at least 40 K and for a climatic environmental temperature range of at least 50 K.This document applies to meters that are installed in locations with vibration and shocks of low significance and in closed locations (indoor
29、 or outdoor with protection as specified by the manufacturer) with condensing or with non-condensing humidityor, if specified by the manufacturer, open locations (outdoor without any covering) with condensing humidity or with non-condensing humidityand in locations with electromagnetic disturbances.
30、Unless otherwise specified in this document: all pressures used are gauge; all influence quantities, except the one under test, are kept relatively constant at their reference value.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their cont
31、ent constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.EN 10204, Metallic products Types of inspection documentsEN 22768-1:1993, General tolerances P
32、art 1: Tolerances for linear and angular dimensions without individual tolerance indications (ISO 2768-1:1989)EN 60079-0, Explosive atmospheres Part 0: Equipment General requirements (IEC 60079-0)EN 60079-11, Explosive atmospheres Part 11: Equipment protection by intrinsic safety “i” (IEC 60079-11)E
33、N 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529)EN 60947-5-6, Low-voltage switchgear and controlgear Part 5-6: Control circuit devices and switching elements DC interface for proximity sensors and switching amplifiers (NAMUR) (IEC 60947-5-6)EN 62246-1, Reed switches Part 1
34、: Generic specification (IEC 62246-1)EN ISO 5167-1:2003, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 1: General principles and requirements (ISO 5167-1:2003)ISO/IEC Guide 98-3, Uncertainty of measurement Part 3: Gu
35、ide to the expression of uncertainty in measurement (GUM:1995)5BS EN 12261:2018EN 12261:2018 (E)3 Terms, definitions and symbols3.1 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.ISO and IEC maintain terminological databases for use in standardizati
36、on at the following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp 3.1.1turbine gas metermeasuring device in which the dynamic forces of the flowing gas cause a turbine wheel to rotate with a speed as a function
37、of the volume flow rate. The number of revolutions of the turbine wheel is the basis for the indication of the volume passed through the meterIt is designed to measure, memorize and display the volume of a fuel gas that has passed through it3.1.2measured quantityvolume in cubic metres, at metering c
38、onditions3.1.3volume flow ratevolume at metering conditions divided by time3.1.4rangeabilityratio between Qminand Qmax, i.e. the minimum and maximum flow rate respectively for which the meter performs within the maximum permissible errors3.1.5average velocityvolume flow rate divided by the cross-sec
39、tional area of the meter connections3.1.6casingpressure containing structure of the meter3.1.7pressures and temperatures3.1.7.1metering pressure (pm)absolute gas pressure to which the indicated volume of gas is related3.1.7.2operating pressuregas pressure within the piping containing the meter3.1.7.
40、3working pressure rangeallowable pressure range over which the meter is calibrated and performs within the metrological requirements3.1.7.4operating temperature rangerange of metering temperatures over which the meter operates within the metrological requirements6 BS EN 12261:2018EN 12261:2018 (E)3.
41、1.7.5maximum design pressure (pmax)pressure on which design calculations are based3.1.8designation3.1.8.1DN-designationnumerical designation of size for components of a pipework system, which is used for reference purposesNOTE It comprises the letters DN followed by a dimensionless whole number whic
42、h is indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connections.3.1.8.2PN-designationalphanumeric term used for reference purposes related to a combination of mechanical and dimensional characteristics of a component of a pipework system with rega
43、rd to pressureNOTE It comprises the letters PN followed by a dimensionless whole number.3.1.9metering conditionsconditions of the gas prevailing at the point of the measurement (e.g.: temperature and pressure of the measured gas in the meter)3.1.10Reynolds number (Re)number referring to the flow con
44、ditions: where the value of D is given by the internal pipe diameter. The parameters (variables) in the above equation and their units are defined in Table 13.1.11error of indicationindication of a turbine meter minus the reference value of the measurandNOTE Errors (E) are expressed as relative valu
45、es (as a percentage) by the ratio of the difference between the indicated volume (Vi) and a reference volume (Vc) of the gas which has passed through the gas meter to this latter value: 3.1.12pressure lossnon-recoverable pressure drop caused by the presence of the turbine meter in the conduit3.1.13p
46、ulse valuenumber of pulses per cubic metre indicated3.1.14gas families3.1.14.11st familygas having a Wobbe index between:23,8 MJ m-3and 31,4 MJ m-3according to EN 437 related on gross calorific value7BS EN 12261:2018EN 12261:2018 (E)3.1.14.22nd familygas having a Wobbe index between:41,3 MJ m-3and 5
47、7,9 MJ m-3according to EN 437 related on gross calorific value3.1.15class 1,0 metermeter which has an error of indication between 2% an + 2% for flow rates Q where Qmin100 or 1,0 % for meters with DN 100.If a meter has been certified for one working pressure range it is deemed to be certified for an
48、y smaller working pressure range.If a meter is certified for one rangeability it is deemed to be certified for any lower rangeability.12 BS EN 12261:2018EN 12261:2018 (E)5.2.1.2 TestBefore type testing, a meter shall undergo a run-in-period of 50 hours at a flow rate of at least 0,5 Qmax.The test co
49、nsists of determining the error of indication of the complete meter at the flow rates given in Table 6.For a meter type specified for measurement in a pressure range below or equal to 4 bar the error of indication test shall be carried out with a gas at atmospheric conditions ( 100 mbar).For a meter type specified for measurement in a pressure range extended above 4 bar the error of indication test shall be carried out with a gas in the range of the specified metering conditions. The tests shall be carried out at least at the lowest a
