BS EN 12261:2018
$198.66
Gas meters. Turbine gas meters
| Published By | Publication Date | Number of Pages |
| BSI | 2018 | 56 |
This 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 devices, 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 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 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 or outdoor with protection as specified by the manufacturer) with 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 document: – all pressures used are gauge; – all influence quantities, except the one under test, are kept relatively constant at their reference value.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | European foreword |
| 7 | 1 Scope 2 Normative references |
| 8 | 3 Terms, definitions and symbols 3.1 Terms and definitions |
| 10 | 3.2 Symbols |
| 11 | 4 Meter classification 4.1 Flange pressure ratings 4.2 Gas meter sizes, rangeability and connection diameter sizes |
| 13 | 4.3 Connections and dimensions 4.4 Temperature ranges 4.5 Climatic environment 5 Metrological performance requirements 5.1 General |
| 14 | 5.2 Type testing 5.2.1 Error of indication |
| 15 | 5.2.2 Metrological stability 5.2.3 Linearity |
| 16 | 5.2.4 Endurance 5.2.5 Meter position |
| 17 | 5.2.6 Temporary overload 5.2.7 Temperature range |
| 18 | 5.2.8 Installation conditions 5.2.9 Maximum permissible pressure loss |
| 19 | 5.2.10 Output shaft (where fitted) 6 Design and material requirements 6.1 General |
| 20 | 6.2 Robustness 6.2.1 General 6.2.2 Meter casing 6.2.3 Resistance to internal pressure |
| 21 | 6.2.4 External leak tightness |
| 22 | 6.2.5 Bending and torsional moment |
| 24 | 6.2.6 Resistance to impact 6.2.7 Transportation and storage 6.3 Resistance to environmental conditions 6.3.1 General 6.3.2 Resistance to ultra-violet radiation |
| 25 | 6.3.3 Resistance to external corrosion |
| 27 | 6.4 Removable meter mechanisms 6.4.1 Integrity |
| 28 | 6.4.2 Performance 6.5 Indicating devices and accessories 6.5.1 General |
| 29 | 6.5.2 Magnetic drive units 6.6 Pressure and temperature tappings 6.6.1 Pressure tappings |
| 30 | 6.6.2 Temperature tappings 6.7 Lubrication 6.7.1 Requirements 6.7.2 Type test |
| 31 | 7 Meter output 7.1 General 7.2 Indicating device 7.2.1 General 7.2.2 Capacity 7.2.3 Unit of indication 7.2.4 Readability |
| 32 | 7.2.5 Adjustment 7.3 Pulse generator 7.3.1 General 7.3.2 Electrical specifications for pulse generators |
| 33 | 7.3.3 Electrical connections 7.4 Output shaft |
| 34 | 7.5 Test element 7.5.1 General provisions 7.5.2 Test element in case of mechanical indicating device 7.5.3 Pulse generator used as test element 8 Marking 8.1 General 8.2 Data plate |
| 35 | 8.3 Direction of flow 8.4 Working position 8.5 Other connections 8.5.1 General 8.5.2 Pressure tappings 8.5.3 Pulse generators 8.5.4 Output shafts |
| 36 | 9 Documentation 9.1 General 9.2 Declaration of conformity 9.3 Instruction manual |
| 37 | Annex A (normative) Test facility specifications |
| 38 | Annex B (normative) Perturbation testing |
| 43 | Annex C (informative) Recommendations for use |
| 44 | Annex D (normative) Individual factory testing |
| 45 | Annex E (normative) Metrological requirements and tests for each meter prior to dispatch (Individual meter testing) |
| 49 | Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2014/32/EU Measuring Instruments Directive aimed to be covered |
| 54 | Bibliography |
