Gas infrastructure - Gas measuring systems - Functional requirements

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.

Gasinfrastruktur - Gasmesssysteme - Funktionale Anforderungen

Diese Europäische Norm legt funktionale Anforderungen an die Planung, den Bau, die Prüfung, die In- und Außerbetriebnahme, den Betrieb und die Instandhaltung sowie gegebenenfalls die Kalibrierung in Verbindung mit geeigneten Dokumentationspflichten für alle neuen Gasmesssysteme und für erhebliche Veränderungen an bestehenden Systemen, die für den eichpflichtigen Verkehr verwendet werden, fest.
Diese Europäische Norm legt außerdem Genauigkeitsklassen für Messsysteme und Schwellenwerte für diese Klassen fest. Der Übereinstimmungsnachweis erfolgt durch Auswahl, Einbau und Betrieb geeigneter Mess-instrumente in Verbindung mit Dokumentationspflichten für die durchzuführenden Berechnungen. Für jede Genauigkeitsklasse werden Beispiele für den Übereinstimmungsnachweis gegeben, dies sind jedoch keine vorgeschriebenen Lösungen.
Diese Europäische Norm gilt für Gase der zweiten Gasfamilie nach EN 437. Sie gilt außerdem für behandelte unkonventionelle Brenngase nach EN 437, für die eine gründliche technische Beurteilung der funktionalen Anforderungen (wie z. B. eingespeistes Biomethan) durchgeführt wird, um sicherzustellen, dass die Integrität der Messsysteme nicht durch andere Bestandteile oder Eigenschaften der Gase beeinträchtigt werden kann.
Diese Europäische Norm kann auch als Leitfaden für Gase der ersten und dritten Gasfamilie nach EN 437 herangezogen werden, in diesem Falle sind aber möglicherweise weitere Betrachtungen erforderlich.
Diese Europäische Norm ist nicht auf Roh- oder Sauergase anwendbar.
Diese Europäische Norm enthält Leitlinien für die Auslegung, die Installation und den Betrieb von Gaszählern mit zusätzlichen Funktionen (intelligente Zähler). Sofern nicht anders festgelegt, sind sämtliche der in dieser Europäischen Norm angegebenen Drücke Überdrücke.
Für angeschlossene Druckregelsysteme gelten die Anforderungen von EN 12186 und/oder EN 12279.
Für die in den Anwendungsbereich der vorliegenden Europäischen Norm fallenden Anforderungen an die Planung, die Einhausung, die Anordnung, die Werkstoffe für die einzelnen Komponenten, den Bau, die Be- und Entlüftung sowie die Sicherheit der Gasmesssysteme insgesamt, gelten zusätzlich, je nach Anwendbar-keit, die Normen EN 15001, EN 12186, EN 12279 und/oder EN 1775.
Diese Europäische Norm legt allgemeine Grundsätze für die Gasinfrastruktur fest. Die Anwender dieser Europäischen Norm sollten sich darüber im Klaren sein, dass detailliertere Nationale Normen und/oder Anleitungen für die Praxis in den CEN-Mitgliedsländern existieren können.
Diese Europäische Norm ist für die Anwendung in Verbindung mit diesen die oben erwähnten allgemeinen Grundsätze darlegenden Nationalen Normen und/oder Anleitungen für die Praxis vorgesehen.
Beim Auftreten von Widersprüchen aufgrund restriktiverer Anforderungen in den nationalen Gesetzen/Vor-schriften im Vergleich zu den in der vorliegenden Europäischen Norm enthaltenen Anforderungen haben die nationalen Gesetze/Vorschriften Vorrang, wie in CEN/TR 13737 (alle Teile) dargestellt.
CEN/TR 13737 (alle Teile) enthält:
   Darstellung der in den Ländern zu beachtenden Gesetze/Vorschriften;
   wenn notwendig, darin enthaltene restriktivere nationale Anforderungen;
   eine nationale Kontaktstelle für die aktuellsten Informationen.

Infrastructure gazière - Systèmes de mesurage du gaz - Prescriptions fonctionnelles

La présente Norme européenne spécifie les prescriptions fonctionnelles pour la conception, la construction, la mise en service/mise en service, l'exploitation, la maintenance et le cas échéant, l'étalonnage approprié, ainsi que les dispositions documentées appropriées pour tous les nouveaux systèmes de mesure de gaz et toutes les modifications majeures des systèmes existants utilisés pour les transactions commerciales.
La présente Norme européenne spécifie également les classes d'exactitude des systèmes de mesure et les seuils applicables à ces classes. La démonstration de la conformité est obtenue par la sélection, l'installation et l'exploitation d'instruments de mesure appropriés, ainsi que par l'utilisation de dispositions documentées appropriées pour les calculs. Des exemples de démonstration de la conformité sont fournis pour chaque classe d'exactitude ; il ne s'agit toutefois pas de solutions prescriptives.
La présente Norme européenne s'applique aux gaz de la 2ème famille conformément à l'EN 437. Elle s'applique également aux gaz combustibles non conventionnels traités conformes à l'EN 437 et pour lesquels une évaluation technique détaillée des prescriptions fonctionnelles (telles que le biométhane injecté) est effectuée en veillant à ce qu'aucun autre constituant ou aucune autre propriété des gaz ne puisse affecter l'intégrité des systèmes de mesure.
La présente Norme européenne peut également servir de guide pour les gaz de la 1ère et de la 3ème famille, conformément à l'EN 437 ; des considérations supplémentaires peuvent toutefois être nécessaires en ce qui concerne les différents constituants et les caractéristiques physiques de la famille des gaz.
La présente Norme européenne ne s'applique pas aux gaz bruts ou corrosifs.
La présente Norme européenne n’est pas applicable pour la mesure de gaz dans une station de remplissage GNC.
La présente Norme européenne fournit des lignes directrices pour la conception, l'installation et l'exploitation des compteurs de gaz comportant des fonctionnalités supplémentaires (compteurs de gaz intelligents).
Les protocoles et les interfaces de communication pour les compteurs de gaz et le télé relevé des compteurs de gaz ne relèvent pas du domaine d'application de la présente Norme européenne et sont couverts par les parties appropriées de l'EN 13757, qui fournissent un certain nombre de protocoles pour les communications relatives aux compteurs. Les protocoles de télésurveillance et d'acquisition de données (SCADA) ne sont pas non plus couverts par la présente Norme européenne.
Sauf indication contraire, toutes les pressions utilisées dans la présente norme sont des pressions effectives.
Pour les systèmes de détente-régulation de pression, les prescriptions de l’EN 12186 et/ou de l’EN 12279 s'appliquent.
Pour les prescriptions relatives à la conception, à l’armoire, à la disposition, aux matériaux des composants, à la construction, à la ventilation, à la mise à l'atmosphère et à la sécurité globale des systèmes de mesure de gaz relevant du domaine d'application de la présente Norme européenne, les normes EN 15001, EN 12186, EN 12279 et/ou EN 1775 s'appliquent également, selon le cas.
La présente Norme européenne spécifie les principes de base communs pour les infrastructures gazières. Il convient que les utilisateurs de la présente Norme européenne gardent à l'esprit l'existence éventuelle, dans les pays membres du CEN, de codes de pratique et/ou de normes nationales plus détaillées.
La présente Norme européenne est destinée à s'appliquer conjointement avec ces normes nationales et/ou codes de pratique, qui détaillent les principes de base précités.
.....

Infrastruktura za plin - Merilni sistemi - Funkcionalne zahteve

Ta evropski standard določa funkcionalne zahteve za načrtovanje, izgradnjo, pregled, delovanje in vzdrževanje novih plinskih merilnih postaj za nedomači prenos skrbništva naravnega plina, kot je opisano v standardu ISO/DIS13686, z zmogljivostjo 500 m3/h ali več (pri osnovnih pogojih, glejte točko 4.1) in za delovni tlak 1 bar ali več (parni tlak). OPOMBA: Naprave, ki uporabljajo mehovne plinomere kot primarne merilne instrumente, niso zajete v tem standardu.

General Information

Status
Published
Public Enquiry End Date
28-Feb-2014
Publication Date
27-Jan-2016
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
07-Jan-2016
Due Date
13-Mar-2016
Completion Date
28-Jan-2016

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Infrastruktura za plin - Merilni sistemi - Funkcionalne zahteveGasinfrastruktur - Gasmesssysteme - Funktionale AnforderungenInfrastructure gazière - Systèmes de mesurage du gaz - Prescriptions fonctionnellesGas infrastructure - Gas measuring systems - Functional requirements91.140.40Sistemi za oskrbo s plinomGas supply systems75.180.30Oprema za merjenje prostornine in merjenjeVolumetric equipment and measurementsICS:Ta slovenski standard je istoveten z:EN 1776:2015SIST EN 1776:2016en,fr,de01-marec-2016SIST EN 1776:2016SLOVENSKI

STANDARDSIST EN 1776:19991DGRPHãþD
SIST EN 1776:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1776
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t r s w ICS
y wä s z rä u r Supersedes EN
s y y xã s { { zEnglish Version

Gas infrastructure æ Gas measuring systems æ Functional requirements Infrastructures gazières æ Systèmes de mesure de gaz æ Prescriptions fonctionnelles

Gasinfrastruktur æ Gasmesssysteme æ Funktionale Anforderungen This European Standard was approved by CEN on

s r October
t r s wä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels

t r s w CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

s y y xã t r s w ESIST EN 1776:2016

EN 1776:2015 (E) 2 Contents Page European foreword ....................................................................................................................................................... 5 Introduction .................................................................................................................................................................... 6 1 Scope .................................................................................................................................................................... 7 2 Normative references .................................................................................................................................... 8 3 Terms and definitions ................................................................................................................................... 9 4 General requirements ................................................................................................................................ 14 4.1 General ............................................................................................................................................................. 14 4.2 Safety and environment ............................................................................................................................. 14 4.3 Quality system for gas measuring system ........................................................................................... 15 5 Basic requirements for measuring systems ....................................................................................... 15 5.1 General ............................................................................................................................................................. 15 5.2 Approach to energy measurement ........................................................................................................ 16 5.3 Classification of the measuring system ................................................................................................ 16 5.4 Gas measuring system modules .............................................................................................................. 18 6 Energy Determination ................................................................................................................................ 18 6.1 General ............................................................................................................................................................. 18 6.2 Requirements for measurements used in energy determination .............................................. 19 6.3 Calculation method of energy using assigned GCV and P, T, Z values ....................................... 21 6.4 Calculation method of energy using an on-site CVDD and on-site PTZ-Conversion ............ 21 6.5 Calculation method of energy using an assigned GCV and PTZ-conversion ........................... 21 6.6 Calculation method of energy using PT-Conversion and assigned GCV and Z value ........... 21 6.7 Calculation method of energy using T-Conversion and assigned GCV, and P, Z values ...... 21 6.8 Gas temperature conversion .................................................................................................................... 21 6.9 Gas pressure conversion ........................................................................................................................... 22 6.10 Compressibility conversion ...................................................................................................................... 22 6.11 PTZ-conversion ............................................................................................................................................. 22 6.12 Uncertainty of energy determination ................................................................................................... 22 7 Design of gas measuring system ............................................................................................................. 23 7.1 General ............................................................................................................................................................. 23 7.2 Safety provision ............................................................................................................................................ 23 7.3 Housing ............................................................................................................................................................ 24 7.4 Gas measuring station ................................................................................................................................ 24 7.5 External influences ...................................................................................................................................... 24 7.6 Gas measuring installation ....................................................................................................................... 25 7.7 Calorific value determination system ................................................................................................... 29 7.8 Gas pressure measurement ...................................................................................................................... 29 7.9 Gas temperature measurement .............................................................................................................. 30 7.10 Conversion device ........................................................................................................................................ 31 7.11 Compression factor ..................................................................................................................................... 31 7.12 Pipework requirements ............................................................................................................................ 32 7.13 Valves................................................................................................................................................................ 32 7.14 Parallel meter runs ...................................................................................................................................... 33 7.15 Pulsations and vibrations ......................................................................................................................... 33 7.16 Filter .................................................................................................................................................................. 34 SIST EN 1776:2016

EN 1776:2015 (E) 3 7.17 Gas conditioning, hydrate protection .................................................................................................... 34 7.18 Duplication of measuring instruments ................................................................................................. 34 7.19 Venting .............................................................................................................................................................. 35 7.20 Ventilation ....................................................................................................................................................... 35 7.21 Odorants and/or additives ........................................................................................................................ 35 7.22 Electromagnetic compatibility (EMC) ................................................................................................... 35 7.23 Documented provisions ............................................................................................................................. 35 8 Construction of a gas measuring installation ..................................................................................... 36 8.1 General ............................................................................................................................................................. 36 8.2 Specific requirements for thermowells ................................................................................................ 37 8.3 Specific requirements for (differential) pressure transducers ................................................... 37 8.4 Specific requirements for sampling systems for CVDD’s ............................................................... 37 8.5 Corrosion protection ................................................................................................................................... 37 8.6 Electrical equipment in hazardous area .............................................................................................. 38 9 Testing of the gas measuring installation/station ............................................................................ 38 9.1 Strength and tightness test........................................................................................................................ 38 9.2 Purging ............................................................................................................................................................. 38 10 Pre-commissioning and commissioning of the gas measuring installation ............................ 38 10.1 General ............................................................................................................................................................. 38 10.2 Pre-commissioning checks ........................................................................................................................ 39 10.3 Commissioning and re-commissioning ................................................................................................ 39 10.4 Acceptance, documentation and hand-over ....................................................................................... 41 10.5 Post-commissioning checks ...................................................................................................................... 41 11 Operation and maintenance ..................................................................................................................... 42 11.1 General ............................................................................................................................................................. 42 11.2 Reference equipment .................................................................................................................................. 43 11.3 Gas meters ....................................................................................................................................................... 43 11.4 Conversion devices ...................................................................................................................................... 45 11.5 Calorific value determination device .................................................................................................... 45 11.6 Sensors ............................................................................................................................................................. 46 11.7 Calibration/verification and maintenance records ......................................................................... 46 12 Decommissioning ......................................................................................................................................... 46 Annex A (informative)

Guideline for the selection of meters .................................................................... 47 Annex B (informative)

Sensor test procedures ............................................................................................... 52 B.1 Differential pressure sensors ................................................................................................................... 52 B.2 Pressure sensors ........................................................................................................................................... 53 B.3 Temperature sensors .................................................................................................................................. 53 B.4 Density sensors ............................................................................................................................................. 54 Annex C (informative)

Set of formulae to calculate volume or mass to energy .................................. 56 C.1 General ............................................................................................................................................................. 56 C.2 Calculation of volume .................................................................................................................................. 56 C.3 Calculation of mass ...................................................................................................................................... 57 C.4 Calculation of energy ................................................................................................................................... 57 Annex D (informative)

Comformity assessment for the energy determination ................................. 58 D.1 Introduction.................................................................................................................................................... 58 SIST EN 1776:2016

EN 1776:2015 (E) 4 D.2 Measurement Systems ................................................................................................................................ 58 D.3 Energy Measurement Systems................................................................................................................. 59 Annex E (informative)

Specific national examples of the assessment of conformityof the metrological performance of a gas measuring system ................................................................... 60 E.1 Introduction ................................................................................................................................................... 60 E.2 Example 1 ........................................................................................................................................................ 61 E.3 Example 2 ........................................................................................................................................................ 64 E.4 Example 3 ........................................................................................................................................................ 67 E.5 Example 4 ........................................................................................................................................................ 70 E.6 Example 5 ........................................................................................................................................................ 72 E.7 Example 6 ........................................................................................................................................................ 74 E.8 Example 7 ........................................................................................................................................................ 77 Annex F (informative)

Documentation and records ..................................................................................... 81 F.1 Documentation .............................................................................................................................................. 81 F.2 Records ............................................................................................................................................................ 81 F.3 Documentation approval ........................................................................................................................... 81 Annex G (informative)

Typical examples of positions of gas measuring installations .................... 82 Annex H (informative)

Significant technical changes from the last edition of this standard, EN 1776:1998 ................................................................................................................................................ 83 Bibliography ................................................................................................................................................................. 84

SIST EN 1776:2016

EN 1776:2015 (E) 5 European foreword This document (EN 1776:2015) has been prepared by Technical Committee CEN/TC 234 “Gas infrastructure”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2016, and conflicting national standards shall be withdrawn at the latest by June 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1776:1998. This document has been prepared under the mandate M/017 given to CEN by the European Commission and the European Free Trade Association. This version of the standard comprises a major revision of EN 1776:1998. The scope of the standard is expanded and now includes also gas measuring systems in light industry, commercial as well as residental use. For this purpose the document has been restructured and amended. This European Standard has in part been developed in response to the work of the European Standards Organisations (CEN/CENELEC/ETSI) under the Commission Mandate M/441. The standard should be read in conjunction with CEN/CLC/ETSI TR 50572, Functional Reference Architecture for Communications in Smart Metering Systems and EN 16314, Gas meters – Additional functionalities (often referred to as a smart gas meter). Directive 2009/73/EC concerning common rules for the internal market in natural gas and the related Regulation (EC) No 715/2009 on conditions for access to the natural gas transmission networks also aim at technical safety (security) including technical reliability of the European gas system. These aspects are also in the scope of CEN/TC 234 standardization. In this respect CEN/TC 234 evaluated the indicated EU legislation and amended this technical standard accordingly, where required and appropriate. This European Standard covers the environmental aspects relevant to the design, construction, operation, and maintenance and commissioning/decommissioning of gas measuring systems, where appropriate, in accordance with CEN Guide 4 and CEN/TR 16388. In preparing this European Standard, a basic understanding of gas infrastructure by the user has been assumed. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 1776:2016

EN 1776:2015 (E) 6 Introduction This European Standard specifies different classes of measuring systems, each having their own specific requirements. By nature, a measuring system is an aggregate of several components. In this European Standard, it is assumed that each component is in full compliance with applicable CEN or ISO standards, if any. This European Standard allows the user to choose between different accuracy classes of measuring systems, the choice of which can be justified on economic grounds. SIST EN 1776:2016

EN 1776:2015 (E) 7 1 Scope 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. SIST EN 1776:2016

EN 1776:2015 (E) 8 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1359, Gas meters — Diaphragm gas meters EN 1594, Gas infrastructure — Pipelines for maximum operating pressure over 16 bar — Functional requirements EN 1775, Gas supply — Gas pipework for buildings — Maximum operating pressure less than or equal to 5 bar — Functional recommendations EN 12186, Gas infrastructure — Gas pressure regulating stations for transmission and distribution — Functional requirements EN 12261, Gas meters — Turbine gas meters EN 12279, Gas supply systems — Gas pressure regulating installations on service lines — Functional requirements EN 12327, Gas infrastructure — Pressure testing, commissioning and decommissioning procedures — Functional requirements EN 12405-1, Gas meters — Conversion devices — Part 1: Volume conversion EN 12405-2, Gas meters — Conversion devices — Part 2: Energy conversion EN 12405-3, Gas meters — Conversion devices — Part 3:Flow computers EN 12480, Gas meters — Rotary displacement gas meters EN 13463-1, Non-electrical equipment for use in potentially explosive atmospheres — Part 1: Basic method and requirements EN 15001-1, Gas Infrastructure — Gas installation pipework with an operating pressure greater than 0,5 bar for industrial installations and greater than 5 bar for industrial and non-industrial installations — Part 1: Detailed functional requirements for design, materials, construction, inspection and testing EN 15001-2, Gas infrastructure — Gas installation pipework with an operating pressure greater than 0,5 bar for industrial installations and greater than 5 bar for industrial and non-industrial installations — Part 2: Detailed functional requirements for commissioning, operation and maintenance EN 60079-10-1, Explosive atmospheres — Part 10-1: Classification of areas — Explosive gas atmospheres (IEC 60079-10-1) EN 60079-14, Explosive atmospheres — Part 14: Electrical installations design, selection and erection (IEC 60079-14) EN 60079-17, Explosive atmospheres — Part 17: Electrical installations inspection and maintenance (IEC 60079-17) EN 61000 (all parts), Electromagnetic compatibility (EMC) SIST EN 1776:2016

EN 1776:2015 (E) 9 EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 1: General principles and requirements (ISO 5167-1) EN ISO 5167-2, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full — Part 2: Orifice plates (ISO 5167-2) EN ISO 6141, Gas analysis — Contents of certificates for calibration gas mixtures (ISO 6141) EN ISO 6142-1, Gas analysis — Preparation of calibration gas mixtures — Part 1: Gravimetric method for Class I mixtures (ISO 6142-1) EN ISO 6143, Gas analysis — Comparison methods for determining and checking the composition of calibration gas mixtures (ISO 6143) EN ISO 6975, Natural gas — Extended analysis — Gas-chromatographic method (ISO 6975) EN ISO 10715, Natural gas — Sampling guidelines (ISO 10715) EN ISO 10723, Natural gas — Performance evaluation for analytical systems (ISO 10723) EN ISO 12213-1, Natural gas — Calculation of compression factor — Part 1: Introduction and guidelines (ISO 12213-1) EN ISO 15970, Natural gas — Measurement of properties — Volumetric properties: density, pressure, temperature and compression factor (ISO 15970) ISO 2186, Fluid flow in closed conduits — Connections for pressure signal transmissions between primary and secondary elements ISO 10790, Measurement of fluid flow in closed conduits — Guidance to the selection, installation and use of Coriolis flowmeters (mass flow, density and volume flow measurements) ISO 17089-1, Measurement of fluid flow in closed conduits — Ultrasonic meters for gas — Part 1: Meters for custody transfer a

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