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BS EN 1776:2015 – TC:2020 Edition

BS EN 1776:2015 – TC:2020 Edition

$280.87

Tracked Changes. Gas infrastructure. Gas measuring systems. Functional requirements

Published By Publication Date Number of Pages
BSI 2020 221
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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 meters). 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 parts 1 and 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
135 Contents Page
138 European foreword
139 Introduction
140 1 Scope
141 2 Normative references
142 3 Terms and definitions
147 4 General requirements
4.1 General
4.2 Safety and environment
148 4.3 Quality system for gas measuring system
5 Basic requirements for measuring systems
5.1 General
149 5.2 Approach to energy measurement
5.3 Classification of the measuring system
5.3.1 General
150 5.3.2 Minimum requirements Class A and Class B
151 5.3.3 Minimum requirements Class C and Class D
5.4 Gas measuring system modules
6 Energy Determination
6.1 General
152 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
153 6.2.3.2 Calorific value determination device (CVDD)
154 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
155 6.9 Gas pressure conversion
6.10 Compressibility conversion
6.11 PTZ-conversion
6.12 Uncertainty of energy determination
156 7 Design of gas measuring system
7.1 General
Figure 1 — Illustration of gas measuring system
7.2 Safety provision
7.2.1 General
157 7.2.2 Hazardous area classification
7.3 Housing
7.4 Gas measuring station
7.5 External influences
158 7.6 Gas measuring installation
7.6.1 General
160 7.6.2 Continuity of supply
7.6.3 Gas meters
161 7.6.4 Gas meters with additional functionalities
7.6.5 Gas meter with remotely operated valve
162 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
163 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
164 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
165 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
166 7.14 Parallel meter runs
7.15 Pulsations and vibrations
7.15.1 General
167 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
168 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
169 7.23.2 Data handling (Security)
8 Construction of a gas measuring installation
8.1 General
170 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
171 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
172 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
173 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
174 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
175 11 Operation and maintenance
11.1 General
176 11.2 Reference equipment
11.3 Gas meters
11.3.1 General
177 11.3.2 Rotary displacement meters
11.3.3 Turbine meters
11.3.4 Vortex meters
11.3.5 Ultrasonic meters
178 11.3.6 Orifice Meters
11.4 Conversion devices
11.5 Calorific value determination device
179 11.6 Sensors
11.7 Calibration/verification and maintenance records
12 Decommissioning
180 Annex A (informative) Guideline for the selection of meters
Table A.1 — Guidelines for the selection of meters
185 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”
186 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
187 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
188 B.4.2 Density sensors for base conditions
189 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
190 C.3 Calculation of mass
C.4 Calculation of energy
191 Annex D (informative) Comformity assessment for the energy determination
D.1 Introduction
D.2 Measurement Systems
192 D.3 Energy Measurement Systems
193 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
194 E.2 Example 1
195 Table E.2 — Example 1
196 Table E.3 — Explanation and justification of Example 1
197 E.3 Example 2
199 Table E.4 — Example 2
200 Table E.5 — Explanation and justification of Example 2
E.4 Example 3
201 Table E.6 — Example 3
202 Table E.7 — Explanation and justification of Example 3
203 E.5 Example 4
204 Table E.8 — Example 4
205 Table E.9 — Explanation and justification of Example 4
E.6 Example 5
206 Table E.10 — Example 5
207 Table E.11 — Explanation and justification of Example 5
E.7 Example 6
208 Table E.12 — Example 6
209 Table E.13 — Explanation and justification of Example 6
210 E.8 Example 7
211 Table E.14 — Example 7
212 Table E.15 — Explanation and justification of Example 7
214 Annex F (informative) Documentation and records
F.1 Documentation
F.2 Records
F.3 Documentation approval
215 Annex G (informative) Typical examples of positions of gas measuring installations
Figure G.1 — Typical examples of positions of gas measuring installations
216 Annex H (informative) Significant technical changes from the last edition of this standard, EN 1776:1998
217 Bibliography

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BS EN 1776:2015 - TC
$280.87