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BS EN 1776:2015

BS EN 1776:2015

$215.11

Gas infrastructure. Gas measuring systems. Functional requirements

Published By Publication Date Number of Pages
BSI 2015 90
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This European Standard specifies functional requirements for the design, construction, testing, commissioning/decommissioning, operation, maintenance and, where appropriate, calibration, together with suitable documented provisions for all new gas measuring systems and any major changes of existing systems.

This European Standard also specifies accuracy classes of measuring systems and thresholds applicable to these classes. Demonstration of compliance is achieved through the selection, installation and operation of appropriate measurement instruments, together with suitable documented provisions for calculations. Examples of demonstration of compliance are provided for each accuracy class; however, they are not prescriptive solutions.

This European Standard is applicable for gases of the 2nd family as classified in EN 437 . It is also applicable for treated non-conventional combustible gases complying with EN 437 and for which a detailed technical evaluation of the functional requirements (such as injected biomethane) is performed ensuring there are no other constituents or properties of the gases that can affect the metrological and physical integrity of the measuring systems.

This European Standard can also be used as a guideline for 1st and 3rd family gases as classified in EN 437 ; however additional considerations should be taken with regard to the different constituents and physical characteristics of the gas family.

This European Standard is not applicable for raw or sour gases.

This European Standard is not applicable for gas measurement in CNG filling station.

This European Standard gives guidelines when designing, installing and operating gas meters with additional functionalities (smart gas meters).

Communication protocols and interfaces for gas meters and remote reading of gas meters are outside the scope of this European Standard and are covered by the appropriate parts of EN 13757 , which provide a number of protocols for meter communications. Supervisory control and data acquisition protocols (SCADA) are also not covered by this European Standard.

Unless otherwise specified all pressures used in this European Standard are gauge pressures.

For associated pressure regulating systems the requirements of EN 12186 and/or EN 12279 apply.

For requirements on design, housing, lay-out, materials for components, construction, ventilation, venting and overall safety of gas measuring systems within the scope of this European Standard, EN 15001 , EN 12186 , EN 12279 and/or EN 1775 apply additionally, where relevant.

This European Standard specifies common basic principles for gas infrastructure. Users of this European Standard should be aware that more detailed national standards and/or codes of practice may exist in the CEN member countries.

This European Standard is intended to be applied in association with these national standards and/or codes of practice setting out the above mentioned basic principles.

In the event of conflicts in terms of more restrictive requirements in national legislation/regulation with the requirements of this European Standard, national legislation/regulation takes precedence as illustrated in CEN/TR 13737‑1 and CEN/TR 13737‑2 .

CEN/TR 13737 (all parts) gives:

  • clarification of all legislation/regulations applicable in a member state;

  • if appropriate, more restrictive national requirements;

  • a national contact point for the latest information.

PDF Catalog

PDF Pages PDF Title
4 Contents Page
7 European foreword
8 Introduction
9 1 Scope
10 2 Normative references
11 3 Terms and definitions
16 4 General requirements
4.1 General
4.2 Safety and environment
17 4.3 Quality system for gas measuring system
5 Basic requirements for measuring systems
5.1 General
18 5.2 Approach to energy measurement
5.3 Classification of the measuring system
5.3.1 General
19 5.3.2 Minimum requirements Class A and Class B
20 5.3.3 Minimum requirements Class C and Class D
5.4 Gas measuring system modules
6 Energy Determination
6.1 General
21 6.2 Requirements for measurements used in energy determination
6.2.1 Base conditions
6.2.2 Flow measurement
6.2.3 Gross calorific value (GCV)
6.2.3.1 General considerations
22 6.2.3.2 Calorific value determination device (CVDD)
23 6.3 Calculation method of energy using assigned GCV and P, T, Z values
6.4 Calculation method of energy using an on-site CVDD and on-site PTZ-Conversion
6.5 Calculation method of energy using an assigned GCV and PTZ-conversion
6.6 Calculation method of energy using PT-Conversion and assigned GCV and Z value
6.7 Calculation method of energy using T-Conversion and assigned GCV, and P, Z values
6.8 Gas temperature conversion
24 6.9 Gas pressure conversion
6.10 Compressibility conversion
6.11 PTZ-conversion
6.12 Uncertainty of energy determination
25 7 Design of gas measuring system
7.1 General
Figure 1 — Illustration of gas measuring system
7.2 Safety provision
7.2.1 General
26 7.2.2 Hazardous area classification
7.3 Housing
7.4 Gas measuring station
7.5 External influences
27 7.6 Gas measuring installation
7.6.1 General
29 7.6.2 Continuity of supply
7.6.3 Gas meters
30 7.6.4 Gas meters with additional functionalities
7.6.5 Gas meter with remotely operated valve
31 7.7 Calorific value determination system
7.7.1 General
7.7.2 Sampling
7.7.3 Provisions for calibration
7.8 Gas pressure measurement
7.8.1 General
32 7.8.2 Gas pressure measurement Class A and Class B
7.8.3 Gas pressure determination Class C and Class D
7.9 Gas temperature measurement
33 7.10 Conversion device
7.10.1 General
7.10.2 Energy conversion device
7.10.3 Volume conversion device
7.10.4 Temperature conversion device
7.11 Compression factor
34 7.12 Pipework requirements
7.12.1 For Class A and Class B measuring installation
7.12.2 For Class C and Class D measuring installation
7.13 Valves
7.13.1 General
7.13.2 By-pass
35 7.14 Parallel meter runs
7.15 Pulsations and vibrations
7.15.1 General
36 7.15.2 Pulsating effects related to specific flow meter types:
7.15.2.1 Turbine meter
7.15.2.2 Rotary displacement meter
7.15.2.3 Ultrasonic meter (non-domestic)
7.16 Filter
7.17 Gas conditioning, hydrate protection
7.18 Duplication of measuring instruments
37 7.19 Venting
7.20 Ventilation
7.21 Odorants and/or additives
7.22 Electromagnetic compatibility (EMC)
7.23 Documented provisions
7.23.1 General
38 7.23.2 Data handling (Security)
8 Construction of a gas measuring installation
8.1 General
39 8.2 Specific requirements for thermowells
8.3 Specific requirements for (differential) pressure transducers
8.4 Specific requirements for sampling systems for CVDD’s
8.5 Corrosion protection
40 8.6 Electrical equipment in hazardous area
9 Testing of the gas measuring installation/station
9.1 Strength and tightness test
9.1.1 General
9.1.2 Test report
9.2 Purging
10 Pre-commissioning and commissioning of the gas measuring installation
10.1 General
41 10.2 Pre-commissioning checks
10.2.1 General
10.2.2 Electrical or electronic system
10.3 Commissioning and re-commissioning
10.3.1 General
10.3.2 Gas meters
10.3.2.1 General
42 10.3.2.2 Non-domestic ultrasonic meters
10.3.2.3 Orifice plate meter
10.3.2.4 Coriolis meter
10.3.3 Instrumentation
10.3.3.1 General
43 10.3.3.2 Conversion device
10.3.3.3 Full functional test
10.3.4 Initial comparison check
10.4 Acceptance, documentation and hand-over
10.5 Post-commissioning checks
44 11 Operation and maintenance
11.1 General
45 11.2 Reference equipment
11.3 Gas meters
11.3.1 General
46 11.3.2 Rotary displacement meters
11.3.3 Turbine meters
11.3.4 Vortex meters
11.3.5 Ultrasonic meters
47 11.3.6 Orifice Meters
11.4 Conversion devices
11.5 Calorific value determination device
48 11.6 Sensors
11.7 Calibration/verification and maintenance records
12 Decommissioning
49 Annex A (informative) Guideline for the selection of meters
Table A.1 — Guidelines for the selection of meters
54 Annex B (informative) Sensor test procedures
B.1 Differential pressure sensors
B.1.1 General
B.1.2 High static pressure testing
B.1.3 “Footprint testing”
55 B.1.4 Atmospheric calibration
B.2 Pressure sensors
B.3 Temperature sensors
B.3.1 Platinum resistance thermometers (PRTs)
B.3.2 Other temperature sensors
56 B.4 Density sensors
B.4.1 Density sensors for operating conditions
B.4.1.1 General
B.4.1.2 Vacuum test
B.4.1.3 Nitrogen/Methane test
B.4.1.4 Calculation method
57 B.4.2 Density sensors for base conditions
58 Annex C (informative) Set of formulae to calculate volume or mass to energy
C.1 General
Table C.1 — Symbols
C.2 Calculation of volume
59 C.3 Calculation of mass
C.4 Calculation of energy
60 Annex D (informative) Comformity assessment for the energy determination
D.1 Introduction
D.2 Measurement Systems
61 D.3 Energy Measurement Systems
62 Annex E (informative) Specific national examples of the assessment of conformityof the metrological performance of a gas measuring system
E.1 Introduction
Table E.1 — Summary of overall accuracy of the examples provided
63 E.2 Example 1
64 Table E.2 — Example 1
65 Table E.3 — Explanation and justification of Example 1
66 E.3 Example 2
68 Table E.4 — Example 2
69 Table E.5 — Explanation and justification of Example 2
E.4 Example 3
70 Table E.6 — Example 3
71 Table E.7 — Explanation and justification of Example 3
72 E.5 Example 4
73 Table E.8 — Example 4
74 Table E.9 — Explanation and justification of Example 4
E.6 Example 5
75 Table E.10 — Example 5
76 Table E.11 — Explanation and justification of Example 5
E.7 Example 6
77 Table E.12 — Example 6
78 Table E.13 — Explanation and justification of Example 6
79 E.8 Example 7
80 Table E.14 — Example 7
81 Table E.15 — Explanation and justification of Example 7
83 Annex F (informative) Documentation and records
F.1 Documentation
F.2 Records
F.3 Documentation approval
84 Annex G (informative) Typical examples of positions of gas measuring installations
Figure G.1 — Typical examples of positions of gas measuring installations
85 Annex H (informative) Significant technical changes from the last edition of this standard, EN 1776:1998
86 Bibliography

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BS EN 1776:2015
$215.11