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BS EN 12261:2024

BS EN 12261:2024

$215.11

Gas meters .Turbine gas meters

Published By Publication Date Number of Pages
BSI 2024 80
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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, hereinafter 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 437:2021, 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. Clauses 1 to 7 and Annex B are for design and type testing only, with the exception of 6.2.4.3, 6.2.5.3, 6.7.1.2.2 and 6.7.2.2.2. Annex C can be used to provide guidance on periodic tests during use. Clause 8 and Annexes D and E are for each meter prior to dispatch. Annex A is intended to be used for both type and individual testing. Annex F is intended to be used for individual testing. Annex G is intended to be used for design.

PDF Catalog

PDF Pages PDF Title
2 undefined
10 1 Scope
2 Normative references
13 3 Terms, definitions and symbols
3.1 Terms and definitions
17 3.2 Symbols
18 4 Meter classification
4.1 General
4.2 Flange pressure ratings
4.3 Gas meter sizes, rangeability and connection diameter sizes
19 4.4 Connections and dimensions
20 4.5 Temperature ranges
4.6 Climatic environment
5 Metrological performance requirements
5.1 General
5.2 Type testing
5.2.1 Error of indication
5.2.1.1 Requirements
21 5.2.1.2 Test
22 5.2.2 Metrological stability
5.2.2.1 Requirements
5.2.2.2 Test
5.2.3 Linearity
5.2.3.1 Requirements
23 5.2.3.2 Test
5.2.4 Endurance
5.2.4.1 Requirements
5.2.4.2 Test
5.2.5 Meter position
5.2.5.1 Requirements
24 5.2.5.2 Test
5.2.6 Temporary overload
5.2.6.1 Requirements
5.2.6.2 Test
5.2.7 Temperature range
5.2.7.1 Requirements
5.2.7.2 Test
25 5.2.8 Installation conditions
5.2.8.1 Requirements
5.2.8.2 Test
5.2.9 Maximum permissible pressure loss
5.2.9.1 Requirements
26 5.2.9.2 Test
5.2.10 Output shaft (where fitted)
5.2.10.1 Requirements
5.2.10.2 Test
27 6 Design, material requirements and manufacturing
6.1 General
6.2 Robustness
6.2.1 General
6.2.2 Materials for pressurized parts
28 6.2.3 Welded joint coefficient
6.2.4 Resistance to internal pressure
6.2.4.1 Requirements
6.2.4.2 Validation method
6.2.4.3 Individual test
29 6.2.5 External leak tightness
6.2.5.1 Requirements
6.2.5.2 Type test
6.2.5.3 Individual test
30 6.2.6 Bending and torsional moment
6.2.6.1 Requirements
6.2.6.2 Type test
31 6.2.7 Resistance to impact
6.2.7.1 Requirements
6.2.7.2 Type test
6.2.8 Transportation and storage
6.2.8.1 Requirements
32 6.2.8.2 Type test
6.3 Manufacturing
6.4 Resistance to environmental conditions
6.4.1 General
33 6.4.2 Resistance to ultraviolet radiation
6.4.2.1 Requirements
6.4.2.2 Type test
6.4.3 Resistance to external corrosion
6.4.3.1 General
6.4.3.2 Penetration resistance
34 6.4.3.3 Adhesion of the protective coating
35 6.4.3.4 Resistance to external corrosive atmosphere
6.5 Removable meter mechanisms
6.5.1 Integrity
6.5.1.1 Requirements
6.5.1.2 Type test
6.5.2 Performance
6.5.2.1 Requirements
36 6.5.2.2 Type test
6.6 Indicating devices and accessories
6.6.1 General
6.6.2 Magnetic drive units
6.6.2.1 Requirements
6.6.2.2 Type test
37 6.7 Pressure and temperature tappings
6.7.1 Pressure tappings
6.7.1.1 General
6.7.1.2 Metering pressure tappings
6.7.1.3 Dimensions
6.7.2 Temperature tappings
6.7.2.1 Requirements
6.7.2.2 Tests
38 6.8 Lubrication
6.8.1 Requirements
6.8.2 Type test
7 Meter output
7.1 General
39 7.2 Indicating device
7.2.1 General
7.2.2 Capacity
7.2.3 Unit of indication
7.2.4 Readability
7.2.5 Adjustment
7.3 Pulse generator
7.3.1 General
40 7.3.2 Electrical specifications for pulse generators
7.3.2.1 General
7.3.2.2 Electrical specifications for high frequency pulse generators
7.3.2.3 Electrical specifications for voltage free contacts
41 7.3.3 Electrical connections
7.4 Output shaft
7.5 Test element
7.5.1 General provisions
7.5.2 Test element in case of mechanical indicating device
42 7.5.3 Pulse generator used as test element
8 Marking
8.1 General
8.2 Data plate
43 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
9 Documentation
9.1 General
9.2 Documentation related to the manufacturer’s tests
44 9.3 Declaration of conformity
9.4 Instruction manual
45 Annex A (normative)Test facility specifications
A.1 Test medium
A.2 Leakage
A.3 Installation conditions
A.4 Reference standards
46 Annex B (normative)Perturbation testing
B.1 General
B.2 Terms and definitions
B.3 Requirements
B.3.1 Low level perturbation
47 B.3.2 High level perturbation
B.4 Tests
B.4.1 Low level perturbations
B.4.1.1 Piping elements installed 2 D upstream of the meter inlet
49 B.4.1.2 Piping elements installed greater than 2 D upstream of the meter inlet
B.4.2 High level perturbations
B.4.2.1 Piping elements installed 2 D upstream of the meter inlet
50 B.4.2.2 Piping elements installed greater than 2 D upstream of the meter inlet
B.5 Similarity
B.6 Flow conditioner
52 Annex C (informative)Recommendations for use
C.1 Pressure loss
C.2 Spin test
53 C.3 Locations of temperature measuring devices
54 Annex D (normative)Individual factory testing
D.1 General
D.2 Meter report
55 Annex E (normative)Metrological requirements and tests for each meter prior to dispatch (Individual meter testing)
E.1 Information required from the purchaser (user)
E.2 Determination of number of tests
E.2.1 Criteria
56 E.3 Error of indication
E.3.1 Requirements
E.3.2 Test
57 E.4 Linearity
E.4.1 Requirements
E.4.2 Test
E.5 WME
E.5.1 Requirement
E.5.2 Test
E.5.3 Adjustment
E.5.3.1 Requirement
58 E.5.3.2 Test
E.6 Data plate specification
E.7 Test certificate
59 Annex F (normative)Compliance evaluation for gas meters
F.1 General
F.2 Quality Management System
F.2.1 General
F.2.2 Compliance evaluation
F.2.3 Issue of the certificate of compliance
60 Annex G (informative)Materials for pressurized parts
68 Annex ZA (informative)Relationship between this European Standard and the essential requirements of Directive 2014/32/EU Measuring Instruments Directive aimed to be covered
73 Annex ZB (informative)Relationship between this European Standard and the essential requirements of Directive 2014/68/EU aimed to be covered

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BS EN 12261:2024
$215.11