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eLibrary >
BS EN 1776:2025 - TC Tracked Changes. Gas infrastructure. Gas measuring systems. Functional requirements >
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BS EN 1776:2025 - TC Tracked Changes. Gas infrastructure. Gas measuring systems. Functional requirements, 2026
- 30552050
- A-30483612 [Go to Page]
- undefined
- European foreword
- Introduction
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- Figure 1 — Illustration of gas measuring system
- 4 General requirements [Go to Page]
- 4.1 General
- 4.2 Safety and environment
- 4.3 Quality and measurement management system
- 5 Basic requirements for gas measuring systems [Go to Page]
- 5.1 General
- 5.2 Classification of the gas measuring system [Go to Page]
- 5.2.1 General
- 5.2.2 Minimum requirements Class A and Class B
- 5.2.3 Minimum requirements Class C and Class D
- 5.3 Gas measuring system modules
- 6 Energy Determination [Go to Page]
- 6.1 General
- 6.2 Requirements for measurements used in energy determination [Go to Page]
- 6.2.1 Base conditions
- 6.2.2 Flow measurement
- 6.2.3 Gross calorific value (GCV) [Go to Page]
- 6.2.3.1 General considerations
- 6.2.3.2 Calorific value determination device (CVDD)
- 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
- 6.9 Gas pressure conversion
- 6.10 Compressibility conversion
- 6.11 PTZ-conversion
- 6.12 Uncertainty of energy determination
- 7 Design of gas measuring system [Go to Page]
- 7.1 General
- 7.2 Safety provision
- 7.3 Housing
- 7.4 Gas measuring station
- 7.5 Gas measuring installation [Go to Page]
- 7.5.1 General
- Figure 2— Example of the process diagram for the gas measuring system [Go to Page]
- 7.5.2 Continuity of supply
- 7.5.3 Gas meters
- 7.5.4 Gas meters with additional functionalities and remotely operated valve
- 7.6 Calorific value determination system [Go to Page]
- 7.6.1 General
- 7.6.2 Sampling
- 7.6.3 Provisions for calibration
- 7.7 Gas pressure measurement [Go to Page]
- 7.7.1 General
- 7.7.2 Gas pressure measurement Class A and Class B
- 7.7.3 Gas pressure determination Class C and Class D
- 7.8 Gas temperature measurement
- 7.9 Conversion device
- 7.10 Compression factor
- 7.11 Pipework requirements [Go to Page]
- 7.11.1 For Class A and Class B measuring installation
- 7.11.2 For Class C and Class D measuring installation
- 7.12 Valves [Go to Page]
- 7.12.1 General
- 7.12.2 By-pass
- 7.13 Parallel meter runs
- 7.14 Pulsations and vibrations [Go to Page]
- 7.14.1 General
- 7.14.2 Pulsating effects related to specific flow meter types [Go to Page]
- 7.14.2.1 Turbine meter
- 7.14.2.2 Rotary displacement meter
- 7.14.2.3 Ultrasonic meter (non-domestic)
- 7.15 Filter
- 7.16 Gas conditioning, hydrate protection
- 7.17 Duplication/redundancy of measuring instruments
- 7.18 Venting
- 7.19 Ventilation
- 7.20 Odorants and/or additives
- 7.21 Electromagnetic compatibility (EMC)
- 7.22 Documented provisions [Go to Page]
- 7.22.1 General
- 7.22.2 Data handling (Security)
- 8 Construction of a gas measuring installation [Go to Page]
- 8.1 General
- 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
- 8.6 Equipment in hazardous area
- 9 Testing of the gas measuring installation/station [Go to Page]
- 9.1 Strength and tightness test [Go to Page]
- 9.1.1 General
- 9.1.2 Test report
- 9.2 Purging
- 10 Pre-commissioning and commissioning of the gas measuring installation [Go to Page]
- 10.1 General
- 10.2 Pre-commissioning checks [Go to Page]
- 10.2.1 General
- 10.2.2 Electrical or electronic system
- 10.3 Commissioning and re-commissioning [Go to Page]
- 10.3.1 General
- 10.3.2 Gas meters [Go to Page]
- 10.3.2.1 General
- 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 [Go to Page]
- 10.3.3.1 General
- 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
- 11 Operation and maintenance [Go to Page]
- 11.1 General
- 11.2 Reference equipment
- 11.3 Gas meters [Go to Page]
- 11.3.1 General
- 11.3.2 Rotary displacement meters
- 11.3.3 Turbine meters
- 11.3.4 Vortex meters
- 11.3.5 Ultrasonic meters
- 11.3.6 Orifice Meters
- 11.4 Conversion devices
- 11.5 Calorific value determination device
- 11.6 Sensors
- 11.7 Calibration/verification and maintenance records
- 12 Decommissioning
- Annex A (informative) Guideline for the selection of meters
- Table A.1 — Guidelines for the selection of meters
- 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”
- 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
- 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 Hydrogen test
- B.4.1.5 Calculation method
- B.4.2 Density sensors for base conditions
- 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
- C.3 Calculation of mass
- C.4 Calculation of energy
- Annex D (informative) Determination of the acceptance criteria for the uncertainty of the energy determination
- D.1 General
- D.2 Measurement Systems
- D.3 Energy Determination Systems
- Annex E (informative) Specific national examples of the assessment of conformity of the metrological performance of a gas measuring system
- E.1 Introduction
- Table E.1 — Summary of overall accuracy of the examples provided
- E.2 Example 1
- Table E.2 — Example 1
- Table E.3 — Explanation and justification of Example 1
- E.3 Example 2
- Table E.4 — Example 2
- Table E.5 — Explanation and justification of Example 2
- E.4 Example 3
- Table E.6 — Example 3
- Table E.7 — Explanation and justification of Example 3
- E.5 Example 4
- Table E.8 — Example 4
- Table E.9 — Explanation and justification of Example 4
- E.6 Example 5
- Table E.10 — Example 5
- Table E.11 — Explanation and justification of Example 5
- E.7 Example 6
- Table E.12 — Example 6
- Table E.13 — Explanation and justification of Example 6
- E.8 Example 7
- Table E.14 — Example 7
- Table E.15 — Explanation and justification of Example 7
- Annex F (informative) Documentation and records
- F.1 Documentation
- F.2 Records
- F.3 Responsibilities for documentation and records
- Annex G (informative) Typical examples of positions of gas measuring installations
- Figure G.1 — Typical examples of positions of gas measuring installations
- Annex H (informative) Significant technical changes from the last edition of this standard, EN 1776:2015
- Table H.1
- Annex I (informative) Hydrogen and its blends with natural gas
- I.1 General
- I.2 5.2.2 Minimum requirements Class A and Class B
- Table I.1 — flow meter calibration, gas analysis and the use of EOS for conversion and energy determination for four gas types
- I.3 6.2.2 Flow measurement
- I.4 6.2.3.1 Gross calorific value (GCV)/ General conciderations
- I.5 6.2.3.2 Calorific value determination device (CVDD)
- I.6 6.3 Calculation method of energy using assigned GCV and P, T, Z values
- I.7 6.4 Calculation method of energy using an on-site CVDD and on-site PTZ-Conversion
- I.8 6.5 Calculation method of energy using an assigned GCV and PTZ-conversion
- I.9 6.6 Calculation method of energy using PT-Conversion and assigned GCV and Z value
- I.10 6.7 Calculation method of energy using T-Conversion and assigned GCV, and P, Z values
- I.11 6.10 Compressibility conversion
- I.12 6.11 PTZ-conversion
- I.13 6.12 Uncertainty of energy determination
- I.14 7.2 Safety provision
- I.15 7.5.3 Gas meters
- I.16 7.11. Compression factor
- I.17 7.11.1 Pipework requirements
- Table I.2 — Risk levels and mitigation measures for high velocity of hydrogen
- Table I.3 — Risk and risk level with hydrogen in existing natural gas grids originating from high flow velocities
- I.18 7.15.1 General
- I.19 7.15.2.1 Turbine meter
- I.20 7.15.2.2 Rotary displacement meter
- I.21 7.15.2.3 Ultrasonic meter (non-domestic)
- I.22 8.1 General
- I.23 8.2 Specific requirements for thermowells
- I.24 8.6 Electrical equipment in hazardous area
- I.25 9.1.1 General
- I.26 10.2.1 General
- I.27 10.2.2 Electrical or electronic system
- I.28 10.3.1 General
- I.29 10.3.2. Gas meters
- Table I.4 — List of product standards for gas meters
- I.30 10.3.2.2 Non-domestic ultrasonic meters
- I.31 10.3.2.3 Orifice plate meter
- I.32 10.3.2.4 Coriolis meter
- I.33 11.2 Reference equipment
- I.34 11.3.1 General
- I.35 11.3.4 Vortex meters
- I.36 11.5 Calorific value determination device
- I.37 B 4.1.4 Hydrogen test
- Table I.5 — Test gases according to the gases in the measuring system
- I.38 G Typical examples of positions of gas measuring installations
- Figure I.1 Typical examples of positions of hydrogen/gas measuring installations
- Bibliography [Go to Page]
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