1、BSI Standards PublicationBS EN 1776:2015Gas infrastructure Gasmeasuring systems Functional requirementsBS EN 1776:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 1776:2015. Itsupersedes BS EN 1776:1999 which is withdrawn.The UK participation in its preparat
2、ion was entrusted to TechnicalCommittee GSE/33/-/5, Gas Measurement (Revision of EN 1776).A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for
3、 its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 81787 8ICS 75.180.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and
4、 Strategy Committee on 31 December 2015.Amendments issued since publicationDate Text affectedBS EN 1776:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1776 December 2015 ICS 75.180.30 Supersedes EN 1776:1998English Version Gas infrastructure - Gas measuring systems - Functional requirement
5、s Infrastructures gazires - Systmes de mesure de gaz - Prescriptions fonctionnelles Gasinfrastruktur - Gasmesssysteme - Funktionale Anforderungen This European Standard was approved by CEN on 10 October 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate t
6、he conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standar
7、d exists 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 nation
8、al standards bodies of 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, Slova
9、kia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means
10、 reserved worldwide for CEN national Members. Ref. No. EN 1776:2015 EBS EN 1776:2015EN 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 Qual
11、ity 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 measuremen
12、ts 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
13、 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 en
14、ergy 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 temp
15、erature 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 BS EN 1776:2015EN 1776:2015 (E) 3 7.17 Gas conditioning, hydrate protection 34 7.18 Duplication of
16、 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 Spec
17、ific requirements for (differential) pressure transducers . 37 8.4 Specific requirements for sampling systems for CVDDs . 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 Purgi
18、ng . 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
19、 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 A
20、nnex 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 Calcu
21、lation of mass 57 C.4 Calculation of energy . 57 Annex D (informative) Comformity assessment for the energy determination . 58 D.1 Introduction 58 BS EN 1776:2015EN 1776:2015 (E) 4 D.2 Measurement Systems 58 D.3 Energy Measurement Systems. 59 Annex E (informative) Specific national examples of the a
22、ssessment 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
23、 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 BS EN 1776:2015EN 1776:2015 (E) 5 Europe
24、an 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 la
25、test 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
26、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 expande
27、d 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)
28、 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/E
29、C 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
30、 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 ma
31、intenance 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,
32、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, Lat
33、via, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 1776:2015EN 1776:2015 (E) 6 Introduction This European Standard specifies different classes of measuring systems, each having their
34、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
35、 classes of measuring systems, the choice of which can be justified on economic grounds. BS EN 1776:2015EN 1776:2015 (E) 7 1 Scope This European Standard specifies functional requirements for the design, construction, testing, commissioning/decommissioning, operation, maintenance and, where appropri
36、ate, 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
37、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
38、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
39、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 t
40、o 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 ope
41、rating 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 m
42、eter 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
43、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 Euro
44、pean 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 nat
45、ional 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 illus
46、trated 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. BS EN 1776:2015EN 1776:2015 (E) 8 2 Nor
47、mative 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
48、) 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
49、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
