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prEN 1776

(Main)

Gas infrastructure - Gas measuring systems - Functional requirements

Gas infrastructure - Gas measuring systems - Functional requirements

This document 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 document 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 document is applicable for gases of the 2nd gas family as classified in EN 437 and for hydrogen and its blends with gases of the 2nd gas family. This document 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 document is not applicable for:
- raw or sour gases.
- gas measurement in CNG and hydrogen fuelling stations.
This document gives guidelines when installing and operating gas meters with additional functionalities (smart meters).
Unless otherwise specified all pressures used in this document 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 document, EN 15001, EN 12186, EN 12279 and/or EN 1775 apply additionally, where relevant.
This document 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 can 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.

Gasinfrastruktur - Gasmesssysteme - Funktionale Anforderungen

Infrastructures gazières - Systèmes de mesure de gaz - Exigences fonctionnelles

Infrastruktura za plin - Merilni sistemi - Funkcionalne zahteve

General Information

Status
Not Published
Publication Date
18-Mar-2025
ICS
75.180.30 - Volumetric equipment and measurements
Technical Committee
CEN/TC 234 - Gas infrastructure
Drafting Committee
CEN/TC 234/WG 5 - Gas measuring
Current Stage
4060 - Closure of enquiry - Enquiry
Start Date
21-Nov-2024
Due Date
09-Jul-2024
Completion Date
21-Nov-2024
Mandate
M/017 - Standardization mandate to CEN in the field of equipment and installation for the transmission and distribution of gas
Ref Project
oSIST prEN 1776:2024 - Gas infrastructure - Gas measuring systems - Functional requirements

Relations

Revises
EN 1776:2015 - Gas infrastructure - Gas measuring systems - Functional requirements
Effective Date
28-Jan-2023

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Standards Content (Sample)


SLOVENSKI STANDARD
01-oktober-2024
Infrastruktura za plin - Merilni sistemi - Funkcionalne zahteve
Gas infrastructure - Gas measuring systems - Functional requirements
Gasinfrastruktur - Gasmesssysteme - Funktionale Anforderungen
Infrastructures gazières - Systèmes de mesure de gaz - Prescriptions fonctionnelles
Ta slovenski standard je istoveten z: prEN 1776
ICS:
75.180.30 Oprema za merjenje Volumetric equipment and
prostornine in merjenje measurements
91.140.40 Sistemi za oskrbo s plinom Gas supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2024
ICS 75.180.30 Will supersede EN 1776:2015
English Version
Gas infrastructure - Gas measuring systems - Functional
requirements
Infrastructures gazières - Systèmes de mesure de gaz - Gasinfrastruktur - Gasmesssysteme - Funktionale
Prescriptions fonctionnelles Anforderungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 234.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1776:2024 E
worldwide for CEN national Members.

Contents
European foreword . 7
Introduction . 8
1 Scope . 9
2 Normative references . 10
3 Terms and definitions . 12
4 General requirements . 19
4.1 General. 19
4.2 Safety and environment . 20
4.3 Quality and measurement management system . 20
5 Basic requirements for gas measuring systems . 20
5.1 General. 20
5.2 Classification of the gas measuring system . 21
5.2.1 General. 21
5.2.2 Minimum requirements Class A and Class B . 22
5.2.3 Minimum requirements Class C and Class D . 23
5.3 Gas measuring system modules . 23
6 Energy Determination . 24
6.1 General. 24
6.2 Requirements for measurements used in energy determination . 24
6.2.1 Base conditions . 24
6.2.2 Flow measurement . 24
6.2.3 Gross calorific value (GCV) . 25
6.3 Calculation method of energy using assigned GCV and P, T, Z values . 26
6.4 Calculation method of energy using an on-site CVDD and on-site PTZ-Conversion . 26
6.5 Calculation method of energy using an assigned GCV and PTZ-conversion . 27
6.6 Calculation method of energy using PT-Conversion and assigned GCV and Z value . 27
6.7 Calculation method of energy using T-Conversion and assigned GCV, and P, Z values
................................................................................................................................................................... 27
6.8 Gas temperature conversion . 27
6.9 Gas pressure conversion . 27
6.10 Compressibility conversion . 27
6.11 PTZ-conversion . 28
6.12 Uncertainty of energy determination . 28
7 Design of gas measuring system . 29
7.1 General. 29
7.2 Safety provision . 29
7.3 Housing . 29
7.4 Gas measuring station . 30
7.5 Gas measuring installation . 30
7.5.1 General. 30
7.5.2 Continuity of supply . 33
7.5.3 Gas meters . 33
7.5.4 Gas meters with additional functionalities and remotely operated valve . 34
7.6 Calorific value determination system . 34
7.6.1 General. 34
7.6.2 Sampling . 35
7.6.3 Provisions for calibration . 35
7.7 Gas pressure measurement . 35
7.7.1 General . 35
7.7.2 Gas pressure measurement Class A and Class B . 35
7.7.3 Gas pressure determination Class C and Class D . 36
7.8 Gas temperature measurement . 36
7.9 Conversion device . 37
7.10 Compression factor . 37
7.11 Pipework requirements . 37
7.11.1 For Class A and Class B measuring installation . 37
7.11.2 For Class C and Class D measuring installation . 38
7.12 Valves . 38
7.12.1 General . 38
7.12.2 By-pass. 38
7.13 Parallel meter runs . 38
7.14 Pulsations and vibrations . 39
7.14.1 General . 39
7.14.2 Pulsating effects related to specific flow meter types: . 40
7.15 Filter . 40
7.16 Gas conditioning, hydrate protection . 40
7.17 Duplication/redundancy of measuring instruments . 40
7.18 Venting. 41
7.19 Ventilation . 41
7.20 Odorants and/or additives . 41
7.21 Electromagnetic compatibility (EMC) . 41
7.22 Documented provisions . 41
7.22.1 General . 41
7.22.2 Data handling (Security) . 42
8 Construction of a gas measuring installation . 43
8.1 General . 43
8.2 Specific requirements for thermowells . 43
8.3 Specific requirements for (differential) pressure transducers . 43
8.4 Specific requirements for sampling systems for CVDD’s . 44
8.5 Corrosion protection . 44
8.6 Electrical equipment in hazardous area . 44
9 Testing of the gas measuring installation/station. 44
...

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