Gas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar - Part 1: General functional requirements

This European Standard describes the general functional requirements for pipelines up to the point of delivery, and also for buried sections of pipework after the point of delivery, for maximum operating pressures up to and including 16 bar for gaseous fuels in accordance with EN 437:1993+A1:2009, Table 1. It applies to their design, construction, commissioning, decommissioning, operation, maintenance, renovation, extension and other associated works. This European Standard does not apply to the materials, design, construction, testing and commissioning of gas infrastructures in use prior to the publication of this European Standard. However, this European Standard does apply to the operation, maintenance, renovation and extension of all gas infrastructures. Specific functional requirements for polyethylene pipelines are given in EN 12007-2, for steel pipelines in EN 12007-3 and for the renovation of pipelines in EN 12007-4. Functional recommendations for pipework for buildings are given in EN 1775. Functional requirements for service lines are given in prEN 12007-5. Functional requirements for pressure testing, commissioning and decommissioning are given in EN 12327. Functional requirements for measuring systems are given in EN 1776. Functional requirements for pressure regulating stations are given in EN 12186. Functional requirements for pressure regulating installations are given in EN 12279. Functional requirements for gas transmission are given in EN 1594. 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 code 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, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts).

Gasinfrastruktur - Rohrleitungen mit einem maximal zulässigen Betriebsdruck bis einschließlich 16 bar - Teil 1: Allgemeine funktionale Anforderungen

Diese Europäische Norm beschreibt die allgemeinen funktionalen Anforderungen für Rohrleitungen bis zur Übergabestelle, sowie für unterirdische Leitungsabschnitte nach der Übergabestelle, für maximal zulässige Betriebsdrücke bis einschließlich 16 bar für gasförmige Brennstoffe entsprechend Tabelle 1 von EN 437:1993+A1:2009. Sie gilt für Planung, Bau, Inbetriebnahme, Außerbetriebnahme, Betrieb, Instandhaltung, Sanierung, Erweiterung und andere dazugehörende Arbeiten.
Diese Europäische Norm ist nicht anwendbar auf Werkstoffe, Planung, Bau, Prüfung und Inbetriebnahme von Gasinfrastruktursystemen, die vor der Veröffentlichung dieser Europäischen Norm betrieben wurden. Diese Europäische Norm gilt jedoch für Betrieb, Instandhaltung, Sanierung und Erweiterung von allen Gasinfrastruktursystemen.
Besondere funktionale Anforderungen für Rohrleitungen aus Polyethylen sind in EN 12007-2 enthalten, für Rohrleitungen aus Stahl in EN 12007-3 und für die Sanierung von Rohrleitungen in EN 12007-4. Funktionale Empfehlungen für Leitungsanlagen für Gebäude sind in EN 1775 enthalten. Funktionale Anforderungen für Anschlussleitungen sind in prEN 12007-5 enthalten.
Funktionale Anforderungen zur Druckprüfung, In- und Außerbetriebnahme sind in EN 12327 enthalten.
Funktionale Anforderungen für Messanlagen sind in EN 1776 gegeben.
Funktionale Anforderungen für Druckregelanlagen sind in EN 12186 gegeben.
Funktionale Anforderungen für Druckregeleinrichtungen sind in EN 12279 enthalten.
Funktionale Anforderungen für Gastransport werden in EN 1594 gegeben.
Diese Europäische Norm enthält allgemeine Grundsätze der Gasversorgung. Anwender dieser Europäischen Norm sollten sich dessen bewusst sein, dass detailliertere nationale Normen bzw. technische Regeln in den CEN-Mitgliedsländern existieren können.
Diese Europäische Norm soll in Verbindung mit diesen, die oben erwähnten allgemeinen Grundsätze darlegenden Nationalen Normen und/oder Technischen Regeln angewendet werden.
Für den Fall eines Konflikts zwischen strengeren nationalen gesetzlichen Anforderungen/Bestimmungen und den Anforderungen dieser Europäischen Norm ist den nationalen gesetzlichen Anforderungen/Bestimmungen wie in CEN/TR 13737 (alle Teile) ausgeführt Vorrang einzuräumen.
CEN/TR 13737 (alle Teile) enthält:
-   eine Klarstellung aller geltenden Rechtsvorschriften/Bestimmungen eines Mitgliedstaats;
-   ggf. weitergehende, strengere nationale Anforderungen;
-   einen nationalen Ansprechpartner für die Weitergabe neuester Informationen.

Infrastructures gazières - Canalisations pour pression maximale de service inférieure ou égale à 16 bar - Partie 1: Recommandations fonctionnelles générales

La présente Norme européenne décrit les exigences fonctionnelles générales pour les canalisations jusqu'au point de livraison, ainsi que pour les tronçons enterrés de tuyauterie en aval du point de livraison, pour des pressions maximales de service inférieures ou égales à 16 bar, et pour des combustibles gazeux conformes au Tableau 1 de l'EN 437:1993+A1:2009. Elle s’applique à leur conception, construction, mise en service, mise hors service, exploitation, maintenance, rénovation, extension et aux autres travaux associés.
La présente Norme européenne ne s’applique pas aux matériels, à la conception, à la construction, aux essais et à la mise en service de systèmes d’alimentation en gaz en service avant la publication de la présente Norme européenne. Cependant, la présente Norme européenne s’applique bien à l’exploitation, la maintenance, la rénovation et l'extension de toutes les infrastructures gazières.
Des exigences fonctionnelles spécifiques pour les canalisations en polyéthylène sont données dans l’EN 12007-2, dans l’EN 12007-3 pour les canalisations en acier et dans l’EN 12007-4 pour la rénovation des canalisations. Des exigences fonctionnelles concernant les tuyauteries dans les bâtiments sont données dans l'EN 1775. Les prescriptions fonctionnelles pour les branchements sont données dans le prEN 12007-5.
Les prescriptions fonctionnelles relatives pour les essais de pression, modes opératoires, de mise en service et de mise hors service sont données dans l’EN 12327.
Les prescriptions fonctionnelles relatives aux postes de comptage sont données dans l’EN 1776.
Les prescriptions fonctionnelles relatives aux postes de détente-régulation de pression sont données dans l’EN 12186.
Les prescriptions fonctionnelles relatives aux installations de détente-régulation de pression de gaz faisant partie des branchements sont données dans l’EN 12279.
Les prescriptions fonctionnelles relatives au transport de gaz sont données dans l’EN 1594.
La présente Norme européenne spécifie les principes de base communs pour les systèmes d'alimentation en gaz. 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.
En cas de conflits en termes d’exigences plus restrictives dans la réglementations/législation nationale vis-à-vis des exigences de cette Norme européenne, la réglementation/législation nationale s’applique comme illustré dans le CEN/TR 13737 (toutes parties).
Le CEN/TR 13737 (toutes parties) donne :
-   la clarification de toutes les législations/règlements applicables dans un état membre ;
-   si approprié, des exigences nationales plus restrictives ;
-   un point de contact national pour une information ultérieure.

Infrastruktura za plin - Cevovodni sistemi za najvišji delovni tlak do vključno 16 bar - 1. del: Splošne funkcionalne zahteve

Ta evropski standard določa splošne funkcionalne zahteve za cevovodne sisteme do točke dobave in tudi za zakopane dele cevovoda za točko dobave za najvišje delovne tlake do vključno 16 bar za plinasta goriva v skladu s preglednico 1 iz standarda EN 437:1993+A1:2009. Uporablja se za projektiranje, konstrukcijo, začetek in prenehanje obratovanja, delovanje, vzdrževanje, obnovo, razširitev ter druga povezana dela. Ta evropski standard se ne uporablja za materiale, projektiranje, konstrukcijo, preskušanje in začetek obratovanja infrastruktur za plin, ki so se uporabljale pred objavo tega evropskega standarda. Vendar se ta evropski standard uporablja za delovanje, vzdrževanje, obnovo in razširitev vseh infrastruktur za plin. Posebne funkcionalne zahteve za polietilenske cevovodne sisteme so navedene v standardu EN 12007-2, za jeklene cevovodne sisteme v standardu EN 12007-3 in za obnovo cevovodnih sistemov v standardu EN 12007-4. Funkcionalna priporočila za cevovodne sisteme za stavbe so navedena v standardu EN 1775. Funkcionalne zahteve za priključne vode so navedene v standardu prEN 12007-5. Funkcionalne zahteve za tlačni preskus, začetek in prenehanje obratovanja so navedene v standardu EN 12327. Funkcionalne zahteve za merilne sisteme so navedene v standardu EN 1776. Funkcionalne zahteve za postaje za regulacijo tlaka so navedene v standardu EN 12186. Funkcionalne zahteve za naprave za regulacijo tlaka so navedene v standardu EN 12279. Funkcionalne zahteve za prenos plina so navedene v standardu EN 1594. Ta evropski standard določa splošna osnovna načela za infrastrukturo za plin. Uporabniki tega evropskega standarda se morajo zavedati, da lahko v državah članicah CEN obstajajo podrobnejši nacionalni standardi in/ali kodeks ravnanja. Ta evropski standard je namenjen uporabi v povezavi s temi nacionalnimi standardi in/ali kodeksi ravnanja, ki določajo zgoraj navedena osnovna načela. Kadar so strožje zahteve v nacionalni zakonodaji/predpisu v nasprotju z zahtevami iz tega evropskega standarda, ima prednost nacionalna zakonodaja/predpis, kot je navedeno v standardu CEN/TR 13737 (vsi deli).

General Information

Status
Published
Public Enquiry End Date
19-Mar-2011
Publication Date
26-Dec-2012
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
12-Nov-2012
Due Date
17-Jan-2013
Completion Date
27-Dec-2012

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Gasinfrastruktur - Rohrleitungen mit einem maximal zulässigen Betriebsdruck bis einschließlich 16 bar - Teil 1: Allgemeine funktionale AnforderungenInfrastructures gazières - Canalisations pour pression maximale de service inférieure ou égale à 16 bar - Partie 1: Recommandations fonctionnelles généralesGas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar - Part 1: General functional requirements91.140.40Sistemi za oskrbo s plinomGas supply systemsICS:Ta slovenski standard je istoveten z:EN 12007-1:2012SIST EN 12007-1:2013en,fr,de01-januar-2013SIST EN 12007-1:2013SLOVENSKI

STANDARDSIST EN 12007-1:20001DGRPHãþD
SIST EN 12007-1:2013
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12007-1
August 2012 ICS 23.040.01 Supersedes EN 12007-1:2000English Version

Gas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar - Part 1: General functional requirements

Infrastructures gazières - Canalisations pour pression maximale de service inférieure ou égale à 16 bar - Partie 1: Exigences fonctionnelles générales

Gasinfrastruktur - Rohrleitungen mit einem maximal zulässigen Betriebsdruck bis einschließlich 16 bar - Teil 1: Allgemeine funktionale Anforderungen This European Standard was approved by CEN on 24 May 2012.

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. 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 Standard 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 national 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12007-1:2012: ESIST EN 12007-1:2013

EN 12007-1:2012 (E) 2 Contents Page Foreword ..............................................................................................................................................................41 Scope ......................................................................................................................................................52 Normative references ............................................................................................................................53 Terms, definitions and abbreviations ..................................................................................................63.1 General terminology ..............................................................................................................................63.2 Pressure related terminology ...............................................................................................................74 Quality .....................................................................................................................................................84.1 Quality and safety management ...........................................................................................................84.2 Competence ...........................................................................................................................................85 Gas characteristics ................................................................................................................................95.1 Gas quality and family ...........................................................................................................................95.2 Odorization .............................................................................................................................................95.3 Toxicity and lack of oxygen ..................................................................................................................96 Materials .................................................................................................................................................97 Design .................................................................................................................................................. 107.1 General ................................................................................................................................................. 107.2 Basic design data ............................................................................................................................... 107.3 Pressure relationships ....................................................................................................................... 117.4 Pipeline sections................................................................................................................................. 127.4.1 General ................................................................................................................................................. 127.4.2 Routing ................................................................................................................................................ 137.4.3 Pipework inside buildings ................................................................................................................. 137.4.4 Pipework above ground ..................................................................................................................... 137.4.5 Bridge crossings................................................................................................................................. 147.4.6 Underwater crossing .......................................................................................................................... 147.4.7 Limiting interference from external causes ..................................................................................... 147.5 Service lines ........................................................................................................................................ 167.6 Pressure regulating stations and installations ................................................................................ 167.7 Measuring stations ............................................................................................................................. 167.8 Valves ................................................................................................................................................... 167.9 Corrosion protection .......................................................................................................................... 168 Limiting environmental impact .......................................................................................................... 189 Transportation, storage and handling of materials ......................................................................... 1810 Construction ........................................................................................................................................ 1810.1 General ................................................................................................................................................. 1810.2 Connections to existing systems ...................................................................................................... 1911 Pressure testing .................................................................................................................................. 2012 Commissioning and decommissioning ............................................................................................ 2013 Operation, survey and maintenance ................................................................................................. 2013.1 General ................................................................................................................................................. 2013.2 Record system and traceability ......................................................................................................... 2113.3 Operation centres ............................................................................................................................... 2113.4 Pipeline operator’s work .................................................................................................................... 2113.5 Third party work .................................................................................................................................. 2213.6 Pipeline maintenance ......................................................................................................................... 22SIST EN 12007-1:2013

EN 12007-1:2012 (E) 3 13.7 Emergency record system.................................................................................................................. 2314 Emergency plan or intervention plan ................................................................................................ 23Annex A (informative)

Areas with high seismic risk ..................................................................................... 25A.1 General ................................................................................................................................................. 25A.2 Procedure ............................................................................................................................................. 25A.3 Strength calculation ............................................................................................................................ 26A.3.1 Vibratory ground motion (shaking) ................................................................................................... 26A.3.2 Permanent ground movement ........................................................................................................... 26A.3.3 Possible action to prevent the allowable/limit values being exceeded ......................................... 27Annex B (informative) Technical changes between this European Standard and EN 12007-1:2000 ........ 28Bibliography ...................................................................................................................................................... 29 SIST EN 12007-1:2013

EN 12007-1:2012 (E) 4 Foreword This document (EN 12007-1:2012) 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 February 2013, and conflicting national standards shall be withdrawn at the latest by February 2013. 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 12007-1:2000. Annex B provides details of significant technical changes between this European Standard and the previous edition. EN 12007 Gas infrastructure

Pipelines for maximum operating pressure up to and including 16 bar consists of the following parts: Part 1: General functional requirements Part 2: Specific functional requirements for polyethylene (MOP up to and including 10 bar) Part 3: Specific functional requirements for steel Part 4: Specific functional requirements for renovation Part 5: Specific functional recommendations of new service lines1 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.

1 To be published. SIST EN 12007-1:2013

EN 12007-1:2012 (E) 5 1 Scope This European Standard describes the general functional requirements for pipelines up to the point of delivery, and also for buried sections of pipework after the point of delivery, for maximum operating pressures up to and including 16 bar for gaseous fuels in accordance with EN 437:1993+A1:2009, Table 1. It applies to their design, construction, commissioning, decommissioning, operation, maintenance, renovation, extension and other associated works. This European Standard does not apply to the materials, design, construction, testing and commissioning of gas infrastructures in use prior to the publication of this European Standard. However, this European Standard does apply to the operation, maintenance, renovation and extension of all gas infrastructures. Specific functional requirements for polyethylene pipelines are given in EN 12007-2, for steel pipelines in EN 12007-3 and for the renovation of pipelines in EN 12007-4. Functional recommendations for pipework for buildings are given in EN 1775. Functional requirements for service lines are given in prEN 12007-5. Functional requirements for pressure testing, commissioning and decommissioning are given in EN 12327. Functional requirements for measuring systems are given in EN 1776. Functional requirements for pressure regulating stations are given in EN 12186. Functional requirements for pressure regulating installations are given in EN 12279. Functional requirements for gas transmission are given in EN 1594. 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 code 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, the national legislation/regulation takes precedence as illustrated in CEN/TR 13737 (all parts). CEN/TR 13737 (all parts) give:  clarification of all legislations/regulations applicable in a member state;  if appropriate, more restrictive national requirements;  a national contact point for the latest information. 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 1776, Gas supply systems

Natural gas measuring stations
Functional requirements EN 12007-3, Gas supply systems
Pipelines for maximum operating pressure up to and including 16 bar

Part 3: Specific functional recommendations for steel prEN 12007-5, Gas infrastructure

Pipelines for maximum operating pressure up to and including 16 bar

Part 5: Specific functional recommendations for new service lines 1 SIST EN 12007-1:2013

EN 12007-1:2012 (E) 6 EN 12186, Gas supply systems
Gas pressure regulating stations for transmission and distribution
Functional requirements 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 3 Terms, definitions and abbreviations For the purposes of this document, the following terms, definitions and abbreviations apply. 3.1 General terminology 3.1.1 gas infrastructure pipeline systems including pipework and their associated stations or plants for the transmission and distribution of gas 3.1.2

pipeline

system of pipework with all associated equipment and stations up to the point of delivery Note 1 to entry: This pipework is mainly below ground but includes also above ground parts. 3.1.3

gas

gaseous fuel which is in gaseous state at a temperature of 15 °C under atmospheric pressure (1,013 25 bar absolute) 3.1.4 point of delivery point of a gas network where the gas is transferred to the user Note 1 to entry: This can be at a means of isolation (e.g. at the outlet of a LPG storage vessel) or at a meter connection. Note 2 to entry: For this European Standard, the point of delivery is typically nominated by the distribution system operator and can be defined in National Regulations or Codes of Practice. 3.1.5 pipeline operator private or public organization authorized to design, construct and or operate and maintain the gas infrastructure 3.1.6 competent person person who is trained, experienced and approved to perform activities relating to gas infrastructures Note 1 to entry: Means of approval, if any, will be determined within each member country. 3.1.7 lower explosive limit LEL concentration of flammable gas or vapour in air, below which the gas atmosphere is not explosive SIST EN 12007-1:2013

EN 12007-1:2012 (E) 7 3.1.8 pipeline components elements from which the pipeline is constructed Note 1 to entry: The following are distinct pipeline elements:  pipes, including cold formed bends;  fittings; EXAMPLE 1

Reducers, tees, factory-made elbows and bends, flanges, caps, welding stubs, mechanical joints.  ancillaries; EXAMPLE 2 Valves, expansion joints, insulating joints, pressure regulators, pumps, compressors.  pressure vessels. 3.1.9 gas main pipework in a gas infrastructure to which service lines are connected 3.1.10 service line pipework from the gas main to the point of delivery of the gas into the installation pipework 3.1.11 installation pipework pipework downstream of the point of delivery terminating at the appliance inlet connection Note 1 to entry: This pipework is normally the property of the customer. 3.1.12 sleeve purposely installed length of protective pipe through which a gas pipe passes 3.1.13 casing protection by means of a construction around the pipeline in order to prevent external loads, or third party interference 3.1.14 carrier pipe existing pipework in which a renovation system is installed Note 1 to entry: The carrier pipe can be either a conduit pipe or a support pipe. 3.1.15 competent authority body authorized by the member country to ensure that the pipeline operator fulfils the requirements of this and other relevant standards 3.2 Pressure related terminology 3.2.1 pressure gauge pressure of the fluid inside the system, measured in static conditions SIST EN 12007-1:2013

EN 12007-1:2012 (E) 8 3.2.2 design pressure DP pressure on which design calculations are based 3.2.3 maximum operating pressure MOP maximum pressure at which a system can be operated continuously under normal operating conditions Note 1 to entry: Normal operating conditions means no fault in any device or stream. 3.2.4 temporary operating pressure TOP pressure at which a system can be operated temporarily under control of the regulating devices 3.2.5 maximum incidental pressure MIP maximum pressure which a system can experience during a short time, limited by the safety devices 3.2.6 strength test pressure STP pressure applied to a system during strength testing 3.2.7 combined test pressure CTP pressure applied to a system during combined testing 4 Quality 4.1 Quality and safety management To provide a consistent and appropriate standard of quality management the pipeline operator shall have organizational, operational and administrative procedures to ensure that activities can be undertaken in a safe and technically sound manner. The pipeline operator shall have suitable systems for technical audit, safety audit and performance review to ensure that established procedures and training programmes continue to meet the obligations of the pipeline operator to users. These should take into account experiences gained. EXAMPLE 1 Operational incidents or other relevant dangerous occurrences.

This system should include, for each activity:  adequate numbers of competent persons; and  adequate other resources. EXAMPLE 2 Vehicles, communication systems and appropriate tools. 4.2 Competence The qualification of competent persons involved in the design, construction, operation and maintenance of a gas infrastructure, or parts of it, shall be in accordance with the characteristics of the pipeline system they are working on. These characteristics include, but are not limited to the following: SIST EN 12007-1:2013

EN 12007-1:2012 (E) 9  family of gas;  local conditions;  design or operating pressure;  materials used in the system;  jointing techniques; and  emergency procedures. 5 Gas characteristics 5.1 Gas quality and family The quality and family of gas supplied through a gas infrastructure shall be specified so that its characteristics are known to system designers and pipeline operators. This specification includes all relevant characteristics which contribute to safe operation and combustion. Changes in the properties of the gas which fall outside pre-determined operating limits shall be notified to pipeline operators in advance. Gas may also be treated or conditioned for operational and maintenance reasons. EXAMPLE 1 For the control of leakage. EXAMPLE 2 For the control of icing conditions at pressure regulating stations and installations. Safe operating procedures for systems supplying gases heavier than air shall recognize the tendency for these gases to settle downwards should they escape from the system. 5.2 Odorization Gas supplied to end users should possess a distinctive odour. Where gas is to possess a distinctive odour its presence in the atmosphere shall be readily detectable at all gas concentrations of 20 % of the lower explosive limit and above. Where the gas does not possess a natural distinctive odour one shall be added for the purpose. The odorant, where added, shall be non-toxic and harmless for the concentrations employed in normal applications, and the odour shall disappear after combustion. An odorant may be omitted in gas delivered specifically for further processing or other special purposes. In this case alternative means shall be available to detect leaks. 5.3 Toxicity and lack of oxygen The potential toxic effects of gas constituents and the potential lack of oxygen shall be considered to ensure safety in all work practices undertaken on the gas infrastructure, in using the gas and in dealing with escaping gas. 6 Materials The characteristics of materials of pipes, fittings and components and the mode of construction of pipelines shall be appropriate to the types of gas being supplied and the conditions under which they are operated. SIST EN 12007-1:2013

EN 12007-1:2012 (E) 10 Materials and products shall conform to the relevant European Standards or, in their absence, to the national or other established standards and shall be of a quality fit for purpose. Consideration shall be given to the effects of climatic conditions on material behaviour and its consequential influence on performance. Materials can give a different technical performance in risk or long term behaviour when exposed to or stored under extreme climatic conditions. EXAMPLE 1 At lower temperatures the critical pressure for rapid crack propagation in polyethylene pipe is reduced. EXAMPLE 2 At low temperatures in steel pipes loss of resilience can occur, and at high temperatures disbondment of coatings on steel pipes can occur. NOTE The critical pressure for rapid crack propagation in polyethylene pipe is tested and verified according to product standards, e.g. EN 1555. For further information, reference should be made to the specific standards for the materials concerned. 7 Design 7.1 General Gas infrastructures are designed to provide a safe and continuous supply of gas. This design considers technical aspects and procedures together with environmental and safety aspects. The gas infrastructure consists of pipeline components arranged in networks or single lines, with associated pressure regulating stations or installations and connections to consumers via service lines. NOTE During the design phase these parts of the system may be considered separately. Basic data and design principles should be documented together with the actual data as the gas infrastructure is built. Data such as the diameter, material, design pressure, family of gas and routing maps should be available as long as the gas infrastructure is in operation, see 13.2. 7.2 Basic design data The design of any gas infrastructure, or part thereof, should commence with a study collecting relevant basic data for the part of the gas infrastructure to be installed. This basic data shall include, but are not limited to the following:  the family of gas;  anticipated gas flow;  design pressure;  diameter(s);  construction materials;  layout of the existing gas infrastructure;  the need for pressure regulation; and  provisional routing of pipeline sections. The design of the gas infrastructure for flow rate capacity shall as a minimum take account of, but not be limited to the following: SIST EN 12007-1:2013

EN 12007-1:2012 (E) 11 a) the family of the gas; b) the location and number of actual or anticipated customers, the predicted customer type, consumption patterns and climatic conditions in the area to be served. Due account should be taken of the diversity of demand in establishing design flow rates; c) the technical operating values to be applied such as: 1) the pressure, which is required to be maintained within values that permit correct functioning of pressure regulators and specific user appliances, at all parts of the system; 2) the requirement to maintain a minimum pressure in the supply system according to the rules of the member countries and the normal pressure range for the system concerned to ensure the safe use of gas; 3) the gas velocity in the pipes, which should be sufficiently low as to limit excessive movement of any impurities and the generation of unacceptable noise phenomena; d) the diameter sizing formulas, elected from those generally used according to pressure ranges. In the case of complex networks, appropriate computer calculation procedures may be used. The parameters identified above should be explicitly indicated in the design process; e) the dynamic variations in gas flow due to special industrial applications. EXAMPLE On-off burners. 7.3 Pressure relationships The relationship between pressures is given in Table 1. SIST EN 12007-1:2013

EN 12007-1:2012 (E) 12 Table 1

Pressure relationships MOP a (bar) TOP ≤ MIP≤ STP/CTP > 5 < P ≤ 16 1,2 MOP 1,30 MOP MIP 2 < P ≤ 5 1,3 MOP 1,40 MOP MIP 0,1 < P ≤ 2 1,5 MOP 1,75 MOP MIP P ≤ 0,1 1,5 MOP 2,50 MOP b MIP a These relations are only valid when DP = MOP. b When gas appliances, tightness tested at 150 mbar, are directly connected to installation pipework, the MIP downstream of the regulator shall be limited to 150 mbar.

MOP shall be equal to or less than the design pressure of the system, including its components. The maximum set value of the active pressure regulator in the working stream shall not exceed MOP. NOTE Where MOP is less than DP, the pressure relationships given in Table 1 may be related to DP.

EXAMPLE Where DP is equal to 0,1 bar and MOP equal to 0,075 bar TOP can reach 1,5 × 0,1 bar and MIP can reach 2,5 × 0,1 bar. For information on specific pressure settings reference should be made to EN 12186 and EN 12279. 7.4 Pipeline sections 7.4.1 General Pipeline sections shall be supported, anchored or buried in such a way that, during their lifetime the pipeline sections will not move with respect to their installed position, except for the foreseen permitted displacements. Submerged pipes shall have enough own weight or outside loading during the construction and operation phases to guarantee horizontal and vertical stability. The pipe wall thickness selection should be based on sufficient resistance to internal pressure and also the forces expected during handling and transportation. Additional measures should be provided as necessary to protect the pipe against third party damage, these measures include, but are not limited to the following:  increased depth of cover;  a control zone along the pipeline route;  increased wall thickness;  additional mechanical protection; and  increased frequency of surveillance. SIST EN 12007-1:2013

EN 12007-1:2012 (E) 13 7.4.2 Routing 7.4.2.1 Public area Pipelines routed along public streets should comply with legal requirements concerning consent, location and distances. Where there is a choice, gas mains should be laid preferably in footways or verges. 7.4.2.2 Private area Where it is necessary to lay gas mains, or associated plant in private land, the agreement document between the landowner and the pipeline operator shall include all necessary precautions to be taken to ensure full safety of operation

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