1、July 2007DEUTSCHE NORM English price group 18No 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 91.140.40!,z27“9871520www
2、.din.deDDIN EN 12261Gas meters Turbine gas meters (includes Amendment A1:2006)English version of DIN EN 12261:2007-07Gaszhler Turbinenradgaszhler (enthlt nderung A1:2006)Englische Fassung DIN EN 12261:2007-07SupersedesDIN EN 12261:2002-08www.beuth.deDocument comprises 55 pages09.07DIN EN 12261:2007-
3、07 2 National foreword This standard has been prepared by CEN/TC 237 “Gas meters”, the Secretariat of which is held by BSI (United Kingdom). The responsible German body involved in its preparation was the Normenausschuss Gastechnik (Gas Technology Standards Committee), Technical Committee AA Gasmess
4、ung. This standard was submitted to the CEN National Members for the unique acceptance procedure. Amendment A1:2006 has been integrated in this standard and is marked by a vertical line in the left margin. This document has been prepared under a mandate given to CEN by the European Commission and th
5、e European Free Trade Association, and supports essential requirements of EU Directive 2004/22, Measuring Instruments Directive (MID). For relationship with EU Directives, see informative Annex ZA, which is an integral part of this document. It is intended to include this standard in the body of Cod
6、es of practice for gas issued by the DVGW Deutsche Vereinigung des Gas- und Wasserfaches e.V. (German Association of Gas and Water Engineers). This standard includes safety requirements. Amendments This standard differs from DIN EN 12261:2002-08 as follows: a) Amendment A1:2006 has been incorporated
7、. b) The scope of the standard has been revised. c) The clauses covering terms and definitions, meter classification, metrological performance requirements, design and material requirements, impulse generators and documentation have been revised and extended. d) A new Annex ZA has been added. Previo
8、us editions DIN 33800: 1986-07 DIN EN 12261: 2002-08 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12261 April 2002 + A1 May 2006 ICS 17.120.10 Supersedes EN 12261:2002English version Gas meters Turbine gas meters Compteurs de gaz Compteurs de gaz turbine Gaszhler Turbinenradgaszhler EN 12261
9、:2002 was approved by CEN on 2001-09-02 and Amendment A1 on 2006-03-20. 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 bibliograp
10、hical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. The European Standards exist in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN m
11、ember into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
12、 Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, and the United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050
13、 Brussels 2006 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12261:2002 + A1:2006 EEN 12261:2002 + A1:2006 (E) 2 Contents Page Foreword to EN 12261:20024 Foreword to EN 12261:2002/A1:2006.4 1 Scope .5 2 Normative references.5 3 T
14、erms, definitions and symbols6 3.1 Terms and definitions 6 3.2 Symbols.9 4 Meter classification 10 4.1 Flange pressure ratings.10 4.2 Gas meter sizes, rangeability and connection diameter sizes 10 4.3 Connections and dimensions .11 4.4 Temperature ranges .12 4.5 Climatic environment .12 5 Metrologic
15、al performance requirements12 5.1 General 12 5.2 Type testing.12 6 Design and material requirements18 6.1 General 18 6.2 Robustness .19 6.3 Resistance to environmental conditions .23 6.4 Removable meter mechanisms.25 6.5 Indicating devices and accessories .26 6.6 Pressure and temperature tappings.27
16、 6.7 Lubrication 28 7 Meter output29 7.1 General 29 7.2 Indicating device.29 7.3 Pulse generator.30 7.4 Output shaft 31 7.5 Test element32 8 Marking 33 8.1 General 33 8.2 Data plate.33 8.3 Direction of flow33 8.4 Working position 33 8.5 Other connections34 9 Documentation34 9.1 General 34 9.2 Declar
17、ation of conformity 34 9.3 Instruction manual34 Annex A (normative) Test facility specifications36 A.1 Test medium36 A.2 Leakage .36 A.3 Installation conditions36 A.4 Reference standards 36 EN 12261:2002 + A1:2006 (E) 3 Annex B (normative) Perturbation testing 37 B.1 General 37 B.2 Terms and definit
18、ions 37 B.3 Requirements . 37 B.4 Tests 38 B.5 Similarity . 41 B.6 Flow conditioner 41 Annex C (informative) Recommendations for use . 43 C.1 Pressure loss 43 C.2 Spin test 43 C.3 Locations of temperature measuring devices 43 Annex D (normative) Individual factory testing 44 D.1 General 44 D.2 Meter
19、 report 44 Annex E (normative) Metrological requirements and tests for each meter prior to dispatch (Individual meter testing) 45 E.1 Information required from the purchaser (user). 45 E.2 Determination of number of tests 45 E.3 Error of indication 46 E.4 Linearity 47 E.5 Weighted mean error (WME).4
20、7 E.6 Data plate specification. 48 E.7 Test certificate 48 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2004/22 Measuring Instruments Directive . 49 Bibliography 53 EN 12261:2002 + A1:2006 (E) 4 Foreword to EN 12261:2002 This docum
21、ent (EN 12261:2002) has been prepared by Technical Committee CEN/TC 237 “Gas meters”, the secretariat of which is held by BSI. 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 October 2002, and con
22、flicting national standards shall be withdrawn at the latest by October 2002. In the preparation of this European Standard, the content of ISO 9951, the content of OIML Publication, “International Recommendation 6” and “International Recommendation 32” and the content of member bodies national stand
23、ards 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 are not specifically covered by this Standard, however, work to produ
24、ce a Standard covering these devices is in progress under CEN/TC 237. Annexes A, B, D and E are normative. Annex C is informative. This standard includes a Bibliography. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to im
25、plement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Foreword to EN 12261:2002/A1:2006 This document (EN 12261:2002/A1
26、:2006) has been prepared by Technical Committee CEN/TC 237 “Gas meters”, the secretariat of which is held by BSI. This Amendment to the European Standard EN 12261:2002 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by Nov
27、ember 2006, and conflicting national standards shall be withdrawn at the latest by November 2006. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive 2004/22, Measuring In
28、struments Directive (MID). For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austr
29、ia, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 12261:2002 + A1:2006
30、(E) 5 1 Scope This European Standard 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 devices, herein after referred to as a meter(s), having in-line pipe connections fo
31、r gas flow measurement. This European Standard applies to turbine gas meters used to measure the volume of fuel gases of the 1st and 2nd gas families, the composition of which is specified in EN 437, at maximum working pressures up to 420 bar, actual flow rates up to 25 000 m3/h over a gas temperatu
32、re range of at least 40 K and for a climatic environmental temperature range of at least 50 K. This standard applies to meters that are installed in locations with vibration and shocks of low significance and in closed locations (indoor or outdoor with protection as specified by the manufacturer) wi
33、th condensing or with non-condensing humidity or, if specified by the manufacturer, open locations (outdoor without any covering) with condensing humidity or with non-condensing humidity and in locations with electromagnetic disturbances. Unless otherwise specified in this standard: all pressures us
34、ed are gauge; all influence quantities, except the one under test, are kept relatively constant at their reference value. Clauses 1 to 7 and annex B are for design and type testing only, with the exception of 6.2.2.3, 6.2.3.3, 6.6.1.1.2 and 6.6.2.2.2. Annex C may be used to provide guidance on perio
35、dic tests during use. Clause 8 and annexes D and E are for each meter prior to dispatch. Annex A shall be used for both type and individual testing. 2 Normative references This European Standard incorporates by dated or undated references provisions from other publications. These normative reference
36、s are cited at the appropriate places in the text and the publications are listed hereafter. For dated references subsequent amendments to or revisions of any of these publications apply to this European standard only when incorporated in it by amendment or revision. For undated references the lates
37、t edition of the publication referred to applies (including amendments). EN 437, Test gases Test pressures Appliance categories EN 10204, Metallic products Types of inspection documents EN 50014, Electrical apparatus for potentially explosive atmospheres General requirements EN 50020, Electrical app
38、aratus for potentially explosive atmospheres Intrinsic safety “I” EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989) EN 60947-5-6, Low-voltage switchgear and controlgear Part 5-6: Control circuit devices and switching elements DC interface for proximity sensors and swi
39、tching amplifier (NAMUR) (IEC 60947-5-6:1999) EN 12261:2002 + A1:2006 (E) 6 EN ISO 5167-1:1995, Measurement of fluid flow by means of pressure differential devices Part 1: Orifice plates, nozzles and Venturi tubes inserted in circular cross-section conduits running full (ISO 5167-1:1991) EN ISO 9001
40、, Quality management systems Requirements (ISO 9001:2000) ISO 3, Preferred numbers Series of preferred numbers ISO 2768-1:1989, General tolerances Part 1: Tolerances for linear and angular dimensions without individual tolerance indications ISO guide to the expression of uncertainty in measurement E
41、N 119000, Generic specification Dry and mercury wetted reed contact units 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1.1 turbine gas meter measuring device in which the dynamic forces of the flow
42、ing gas cause a turbine wheel to rotate with a speed as a function 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 meter It is designed to measure, memorize and display the volume of a fuel gas that has passed t
43、hrough it. 3.1.2 measured quantity volume in cubic metres, at metering conditions 3.1.3 volume flow rate volume at metering conditions divided by time 3.1.4 rangeability the ratio between Qminand Qmax, i.e. the minimum and maximum flow rate respectively for which the meter performs within the maximu
44、m permissible errors 3.1.5 average velocity volume flow rate divided by the cross-sectional area of the meter connections 3.1.6 casing pressure containing structure of the meter 3.1.7 pressures and temperatures 3.1.7.1 metering pressure (pm) absolute gas pressure to which the indicated volume of gas
45、 is related EN 12261:2002 + A1:2006 (E) 7 3.1.7.2 operating pressure gas pressure within the piping containing the meter 3.1.7.3 working pressure range allowable pressure range over which the meter is calibrated and performs within the metrological requirements 3.1.7.4 operating temperature range ra
46、nge of metering temperatures over which the meter operates within the metrological requirements 3.1.7.5 maximum design pressure (pmax) pressure on which design calculations are based 3.1.8 designation 3.1.8.1 DN-designation numerical designation of size for components of a pipework system, which is
47、used for reference purposes. It comprises the letters DN followed by a dimensionless whole number which is indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connections 3.1.8.2 PN-designation alphanumeric term used for reference purposes related to a
48、 combination of mechanical and dimensional characteristics of a component of a pipework system with regard to pressure. It comprises the letters PN followed by a dimensionless whole number 3.1.9 metering conditions conditions of the gas prevailing at the point of the measurement (e.g.: temperature a
49、nd pressure of the measured gas in the meter) 3.1.10 Reynolds number (Re) number referring to the flow conditions: v DQ= R35370,e 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 1 3.1.11 error of indication indication of a turbine meter minus the reference value of the measurand Errors (E) are expressed as relative values (as a percentage) by the ratio of the difference between the indicated volume (Vi) and a reference volume (Vc) of t
