Gas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar - Part 5: Service lines - Specific functional requirements

This standard describes the specific functional recommendations for service lines in addition to the general functional recommendations of EN 12007-1 for: a) a maximum operating pressure (MOP) up to and including 16 bar; b) an operating temperature between -20 °C and +40 °C. The service line is the physical asset comprising of the pipeline from the gas main Branch Saddle or Top Tee to the outlet of the Distribution Operator’s nominated point(s) of delivery (for example: isolation valve, regulator, meter connection or combination of regulator and isolation valve). The ownership and operation responsibility may vary between member states. Consult Figure 1 (A/B/C) and member state regulations and standards. This standard includes technical recommendations in relation to design, construction, operation, maintenance and abandonment of the service line asset. Detail in relation to buried pipework, gas pressure regulating installations and gas metering systems are addressed in other standards. NOTE 1 For more information on buried pipework, see EN 12007-1, EN 12007-2 and EN 12007-3. NOTE 2 For more information on gas pressure regulating installations, see EN 12186 and EN 12279. NOTE 3 For more information on gas metering systems, see EN 1776.

Gasinfrastruktur - Rohrleitungen mit einem maximal zulässigen Betriebsdruck bis einschließlich 16 bar - Teil 5: Hausanschlussleitungen - Spezifische funktionale Anforderungen

Diese Europäische Norm beschreibt die spezifischen funktionalen Anforderungen für Anschlussleitungen zusätzlich zu den allgemeinen funktionalen Anforderungen nach EN 12007 1 für:
a)   einen maximalen Betriebsdruck (MOP) bis einschließlich 16 bar;
b)   eine Betriebstemperatur zwischen 20 °C und 40 °C.
Die Anschlussleitung ist die Anlage, die aus der Verbindungsleitung vom Anschlussstück der Hauptgasleitung bis zum Anschluss an die vom Netzbetreiber benannte(n) Übergabestelle(n) besteht (zum Beispiel: Absperrventil, Gasdruckregelgerät, Gaszähleranschluss oder eine Kombination von Gasdruckregelgerät und Absperrventil).
Die Eigentümerschaft und die Verantwortung für den Betrieb können sich zwischen den Mitgliedstaaten unterscheiden. Der Umfang der Anschlussleitung kann in jedem Mitgliedstaat verschieden sein. Zur Verdeut-lichung sind die verschiedenen Übergabestellen in Bild 1 dargestellt. Bild 1 (A/B/C/D/E) sowie die Vorschriften und Normen der Mitgliedstaaten sind heranzuziehen.
ANMERKUNG 1   Das Ventil an Punkt A wird nicht notwendigerweise in jedem Mitgliedstaat verwendet.
ANMERKUNG 2   Nationale Präferenzen für Übergabestellen sollten im nationalen Vorwort angegeben werden.
Diese Europäische Norm beinhaltet technische Anforderungen für Planung, Bau, Betrieb, Instandhaltung und Außerbetriebnahme der Anschlussleitungsanlage.
Spezifische funktionale Anforderungen für Polyethylen-Rohrleitungen sind EN 12007 2 zu entnehmen.
Besondere funktionale Anforderungen für Stahlrohrleitungen sind EN 12007 3 zu entnehmen.
Funktionale Empfehlungen für Leitungsanlagen für Gebäude sind EN 1775 zu entnehmen.
Funktionale Anforderungen für Druckregeleinrichtungen sind EN 12279 zu entnehmen.
Funktionale Anforderungen für Messanlagen sind EN 1776 zu entnehmen.
Funktionale Anforderungen für Druckprüfung, In- und Außerbetriebnahme sind EN 12327 zu entnehmen.

Infrastructures gazières - Canalisations pour pression maximale de service inférieure ou égale à 16 - Partie 5: Branchements - Recommandations fonctionnelles spécifiques

La présente Norme européenne décrit les exigences fonctionnelles spécifiques applicables aux branchements, en complément des exigences fonctionnelles générales de l’EN 12007-1, pour :
a)   une pression maximale de service (MOP) inférieure ou égale à 10 bar;
b)   une température de service comprise entre - 20 °C et + 40 °C.
Le branchement est l’élément physique comprenant la canalisation depuis une selle de raccordement ou un raccord en T sur la conduite de desserte de gaz jusqu’à la sortie du système de distribution de l’exploitant, désigné (par exemple: vanne d'isolement, régulateur, compteur de connexion ou combinaison de régulateur et vanne d'isolement).
La propriété et la responsabilité de l'exploitation peuvent varier entre les Etats membres. L'étendue du branchement peut différer dans chaque Etat membre. Pour illustrer cela, les différents points de livraison sont indiqués à la Figure 1. Consultez la Figure 1 (A/B/C/D/E) et les réglementations et normes des États membres.
NOTE 1   Le robinet  au point A n'est pas nécessairement utilisé par chaque Etat membre.
NOTE 2   La préférence nationale pour les points de livraison doit être indiquée dans l'avant-propos national.

Infrastruktura za plin - Cevovodni sistemi za najvišji delovni tlak do vključno 16 bar - 5. del: Priključni cevovodi - Posebne funkcionalne zahteve

Ta evropski standard opisuje posebne funkcionalne zahteve za plinske priključke poleg splošnih funkcionalnih zahtev iz standarda EN 12007-1 za:
a) najvišji obratovalni tlak (MOP) do vključno 16 barov,
b) obratovalno temperaturo med -20 °C in +40 °C.
Uporablja se za projektiranje, konstruiranje, začetek in prenehanje obratovanja, delovanje, vzdrževanje, obnovo, razširitev ter druga povezana dela. Plinski priključek je fizična dobrina, sestavljena iz plinovoda, ki vodi iz nosilnega razvejitvenega priključka T glavnega plinovoda ali vrhnjega priključka T do odvodnih točk dobave, ki jih izbere upravljavec distribucijskega sistema: (na primer: ločilni ventil, regulator, povezava s števcem ali kombinacija regulatorja in ločilnega ventila). Odgovornost za lastništvo in delovanje se med državami članicami lahko razlikuje. Obseg servisne linije se med državami članicami lahko razlikuje. To je prikazano z različnimi točkami dobave, kot je označeno na sliki 1. Glejte sliko 1 (A/B/C/D/E) ter preverite predpise in standarde države članice. OPOMBA: posamezne države članice morda ne predpisujejo uporabe ventila na točki A. Nacionalne preference za točke dobave morajo biti navedene v nacionalnem predgovoru.

General Information

Status
Published
Public Enquiry End Date
19-Feb-2013
Publication Date
02-Jun-2014
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
20-May-2014
Due Date
25-Jul-2014
Completion Date
03-Jun-2014

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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 5: Hausanschlussleitungen - Spezifische funktionale AnforderungenInfrastructures gazières - Canalisations pour pression maximale de service inférieure ou égale à 16 - Partie 5: Branchements - Recommandations fonctionnelles spécifiquesGas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar - Part 5: Service lines - Specific functional requirements91.140.40Sistemi za oskrbo s plinomGas supply systemsICS:Ta slovenski standard je istoveten z:EN 12007-5:2014SIST EN 12007-5:2014en,fr,de01-julij-2014SIST EN 12007-5:2014SLOVENSKI

STANDARD
SIST EN 12007-5:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12007-5
April 2014 ICS 23.040.01 English Version

Gas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar - Part 5: Service lines - Specific functional requirements

Infrastructures gazières - Canalisations pour pression maximale de service inférieure ou égale à 16 bar - Partie 5: Branchements - Recommandations fonctionnelles spécifiques

Gasinfrastruktur - Rohrleitungen mit einem maximal zulässigen Betriebsdruck bis einschließlich 16 bar - Teil 5: Hausanschlussleitungen - Spezifische funktionale Anforderungen This European Standard was approved by CEN on 8 February 2014.

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
CEN-CENELEC Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12007-5:2014 ESIST EN 12007-5:2014

EN 12007-5:2014 (E) 2 Contents Page

Introduction .........................................................................................................................................................5 1 Scope ......................................................................................................................................................6 2 Normative references ............................................................................................................................7 3 Terms and definitions ...........................................................................................................................8 3.1 General terminology ..............................................................................................................................8 3.2 Pressure related terminology ............................................................................................................ 10 4 Design .................................................................................................................................................. 10 4.1 General ................................................................................................................................................. 10 4.2 Protection ............................................................................................................................................ 11 4.3 Materials and components ................................................................................................................ 12 4.3.1 General ................................................................................................................................................. 12 4.3.2 Isolation valve ..................................................................................................................................... 12 4.3.3 Flow limiting device ............................................................................................................................ 13 4.3.4 Venting devices................................................................................................................................... 13 4.3.5 Regulators and meters ....................................................................................................................... 13 4.4 Service line routing............................................................................................................................. 13 4.4.1 External routing .................................................................................................................................. 13 4.4.2 Wall and floor transition ..................................................................................................................... 13 4.4.3 Internal routing .................................................................................................................................... 14 4.5 Pipe sizing ........................................................................................................................................... 15 4.6 Identification ........................................................................................................................................ 15 5 Construction ........................................................................................................................................ 15 5.1 General ................................................................................................................................................. 15 5.2 Storage, handling and transportation............................................................................................... 16 5.3 Service line installation ...................................................................................................................... 16 5.4 Connections to existing gas infrastructure ..................................................................................... 17 6 Quality control ..................................................................................................................................... 17 6.1 Quality management system ............................................................................................................. 17 6.2 Inspection prior to installation .......................................................................................................... 17 6.3 Inspection during installation ............................................................................................................ 17 6.3.1 Ground conditions .............................................................................................................................. 17 6.3.2 Joint integrity ...................................................................................................................................... 18 6.4 Competence ........................................................................................................................................ 18 7 Pressure testing .................................................................................................................................. 18 7.1 General ................................................................................................................................................. 18 7.2 Safety during pressure testing .......................................................................................................... 19 7.3 Prior to testing .................................................................................................................................... 19 7.4 Test mediums ...................................................................................................................................... 19 7.5 Measurement equipment ................................................................................................................... 19 7.6 Strength test ........................................................................................................................................ 19 7.7 Tightness test ...................................................................................................................................... 20 7.8 Failed pressure test ............................................................................................................................ 20 8 Commissioning and decommissioning ............................................................................................ 21 8.1 General ................................................................................................................................................. 21 8.2 Purging ................................................................................................................................................ 21 9 Operation and maintenance .............................................................................................................. 21 9.1 General ................................................................................................................................................. 21 SIST EN 12007-5:2014

EN 12007-5:2014 (E) 3 9.2 Record system and traceability ......................................................................................................... 22 Annex A (normative) Jointing methods ........................................................................................................... 23 A.1 General ................................................................................................................................................. 23 A.2 Threaded joints .................................................................................................................................... 23 A.3 Fusion, welded, brazed and soldered joints ..................................................................................... 23 A.4 Mechanical joints ................................................................................................................................. 23 A.5 Pressed joints ...................................................................................................................................... 23 A.5.1 General ................................................................................................................................................. 23 A.5.2 Pressed joints for copper pipe ........................................................................................................... 24 Bibliography ...................................................................................................................................................... 25

SIST EN 12007-5:2014

EN 12007-5:2014 (E) 4 Foreword This document (EN 12007-5:2014) 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 October 2014 and conflicting national standards shall be withdrawn at the latest by October 2014. 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 has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). This European Standard is part of the series EN 12007 "Gas infrastructure — Pipelines for maximum operating pressure up to and including 16 bar" which comprises 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 lines. 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 12007-5:2014

EN 12007-5:2014 (E) 5 Introduction This European Standard describes the general functional requirements for gas supply through service line pipe systems and covers the pressure range up to and including 16 bar maximum operating pressure (MOP). It gives normative and informative references for safe and secure gas infrastructures. It applies to their design, construction, operation and the related aspects of safety, environment and public health, all in order to provide a safe and secure supply of gas. This European Standard is intended to be used in addition to the EN 12007 series of European Standards. The requirements of this European Standard are based on safe gas engineering practice under conditions normally encountered in the gas industry. Requirements for all unusual conditions cannot be specifically provided for, nor are all engineering and construction details prescribed. Existing industrial safety regulations applying to work areas, safety devices and safe work practices are not intended to be supplanted by this European Standard. Persons responsible for the design, construction and operation of gas infrastructures should have regard to the guidance given in this European Standard, the EN 12007 series of European Standards and to other relevant standards. It is the responsibility of these persons to apply these functional requirements, supplemented with other proven good practice to the particular circumstances of each gas infrastructure. The recommendations in this European Standard are intended to be applied by competent persons who have suitable knowledge and experience. Notes in the text are informative. The designer, constructor or operator of service line and pipeline systems is cautioned that this European Standard is not a design handbook or code of practice. Additional national or company standards describing the details are needed. These detailed standards should be in line with the basic principles of this European Standard. All pressures are gauge pressure unless stated otherwise. In preparing this European Standard it was recognised that the suite of relevant European Standards is incomplete. Reference may be made where appropriate to international, national or other standards until relevant European Standards are available. SIST EN 12007-5:2014

EN 12007-5:2014 (E) 6 1 Scope This European Standard describes the specific functional requirements for service lines in addition to the general functional requirements of EN 12007-1 for: a) a maximum operating pressure (MOP) up to and including 16 bar; b) an operating temperature between -20 °C and +40 °C. It applies to their design, construction, commissioning, decommissioning, operation, maintenance, extension and other associated works. The service line is the physical asset comprising of pipework from the gas main branch saddle or top tee to the outlet of the distribution system operator’s nominated point(s) of delivery (for example: isolation valve, regulator, meter connection or combination of regulator and isolation valve). The ownership and operation responsibility can vary between member states. The extent of the service line can differ in each member state. To illustrate this, the various points of deliveries are indicated in Figure 1. Consult Figure 1 (A/B/C/D/E) and member state regulations and standards. NOTE The valve at point A is not necessarily utilised by each member state. National preference for points of deliveries should be stated in the national foreword.

Key P gas main Distribution system operator nominated Point(s) of Delivery: T Top Tee / Branch Saddle A outlet of below ground service line valve outside the building M/R Meter and/or Regulator B outlet of above ground service line valve outside the building

C outlet of meter/regulator outside the building
D outlet of above ground service line valve inside the building

E outlet of meter/regulator inside the building Figure 1 — Distribution system operator nominated point of delivery Specific functional requirements for: — polyethylene pipelines are given in EN 12007-2. — steel pipelines are given in EN 12007-3. — pipework for buildings are given in EN 1775. SIST EN 12007-5:2014

EN 12007-5:2014 (E) 7 — pressure regulating installations are given in EN 12279 or EN 12186. — pressure testing, commissioning and decommissioning are given in EN 12327. This European Standard represents the recommendations at the time of its preparation. It does not apply retrospectively to installations before the publication date unless specifically stated. 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) gives: — 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 751-1, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 1: Anaerobic jointing compounds EN 751-2, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 2: Non-hardening jointing compounds EN 751-3, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 3: Unsintered PTFE tapes. EN 1057, Copper and copper alloys - Seamless, round copper tubes for water and gas in sanitary and heating applications EN 1254 (all parts), Copper and copper alloys — Plumbing fittings EN 1775:2007, Gas supply - Gas pipework for buildings - Maximum operating pressure less than or equal to 5 bar - Functional recommendations EN 1776, Gas supply systems - Natural gas measuring stations - Functional requirements EN 10226-1, Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external threads and parallel internal threads - Dimensions, tolerances and designation EN 10226-2, Pipe threads where pressure tight joints are made on the threads - Part 2: Taper external threads and taper internal threads - Dimensions, tolerances and designation EN 10241, Steel threaded pipe fittings SIST EN 12007-5:2014

EN 12007-5:2014 (E) 8 EN 10242, Threaded pipe fitting in malleable cast iron EN 12007-1:2012, Gas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar - Part 1: General functional requirements EN 12007-2:2012, Gas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar - Part 2: Specific functional requirements for polyethylene (MOP up to and including 10 bar) EN 12007-3, Gas infrastructure - Pipelines for maximum operating pressure up to and including 16 bar - Part 3: Specific functional recommendations for steel 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 and definitions 3.1 General terminology For the purposes of this document, the following terms and definitions apply. 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 gas main pipework in a gas infrastructure to which service lines are connected 3.1.3 service line pipework from the gas main to the point of delivery of the gas into the installation pipework 3.1.4 casing protection by means of a construction around the pipeline in order to prevent external loads, or third party interference 3.1.5 sleeve protective pipe through which a gas pipe passes 3.1.6 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, see Figure 1. SIST EN 12007-5:2014

EN 12007-5:2014 (E) 9 3.1.7 authorised person competent person who is appointed to fulfil a given task on gas infrastructure 3.1.8 competent person person who is trained, experienced and approved to perform activities relating to gas infrastructures or installation pipework Note 1 to entry: Means of approval, if any, will be determined within each member country. 3.1.9 flow limiting device purpose manufactured self-actuating device which can limit or stop uncontrolled excess flow of gas 3.1.10 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. 3.1.11 purging process for safely removing air or inert gas from pipework and/or pipeline components and replacing it with gas, or the reverse process Note 1 to entry: A distinction is made between the following methods: — direct purging is the displacement of air by gas or vice versa; — indirect purging is the displacement of air by inert gas followed by the displacement by gas or vice versa. Note 2 to entry: Alternatively by means of a barrier (a slug of inert gas or a pig) between the air and the gas or vice versa. 3.1.12 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; — ancillaries; — pressure vessels. EXAMPLE 1 Reducers, tees, factory-made elbows and bends, flanges, caps, welding stubs, mechanical joints. EXAMPLE 2 Valves, expansion joints, insulating joints, pressure regulators, pumps, compressors. 3.1.13 strength test specific procedure to verify that the pipework and/or station meets the requirements for mechanical strength SIST EN 12007-5:2014

EN 12007-5:2014 (E) 10 3.1.14 tightness test specific procedure to verify that the pipework and/or station meets the requirements for tightness 3.1.15 combined test specific procedure to verify that the pipework and/or station meets the requirements for mechanical strength and tightness 3.2 Pressure related terminology 3.2.1 design pressure DP pressure on which design calculations are based 3.2.2 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 are described as no fault in any device or stream. 3.2.3 strength test pressure STP pressure applied to a system during strength testing 3.2.4 tightness test pressure TTP pressure applied to a system during tightness testing 3.2.5 combined test pressure CTP pressure applied to a system during combined testing 4 Design 4.1 General 4.1.1 Any person who is responsible for the design of service lines shall be a competent person. 4.1.2 Gas infrastructures shall be designed to provide a safe and continuous supply of gas. This design considers technical aspects and procedures together with environmental and safety aspects in accordance with Clause 7 of EN 12007-1:2012. 4.1.3 The characteristics of materials of pipes, fittings and components and the mode of construction of service lines shall be appropriate to the types of gas being supplied and the conditions under which they are operated. 4.1.4 The design of the service line under normal operational conditions shall address, at a minimum but not be limited to, the effects of: — the MOP and flow rates; SIST EN 12007-5:2014

EN 12007-5:2014 (E) 11 — ground subsidence; — temperature, and fluctuations (high or low); — loading due to depth of cover; — chemical corrosion by water, e.g. extra-ordinary acids, salts and (cyclic) hydrocarbons; — other underground infrastructures (operating under normal conditions); — mechanical impact e.g. manual digging tools, vehicles, etc.; — gas velocity causing erosion; — seismic activity; and — UV exposure. NOTE Additional considerations from external elements can also include: — traffic loading; — stray electrical currents; and — gradual growth of tree roots. 4.1.5 The design should consider additional measures based on the following factors: — location of service line e.g. outside/inside, above ground/below ground, etc; — the building usage; — the supply pressure; — the local public and traffic density; and — the response time to make safe. 4.1.6 Service lines shall be designed and constructed to facilitate maintenance. The distance to other structures and infrastructures should be considered. 4.1.7 For emergency isolation, maintenance and alteration there shall be a minimum of one manual isolation valve. The manual isolation valve shall be accessible to the distribution system operator and/or the consumer. 4.1.8 Specific additional protection measures should be considered to minimise any impact of failure of service line components where practicable. 4.1.9 Connections to the gas main shall not weaken or compromise the gas system. 4.2 Protection 4.2.1 The design shall consider protection of the service line from impact, corrosion, UV and vandalism. 4.2.2 The design shall protect against the uncontrolled release of gas, or the serious aggravation of fire and minimise the likelihood of an explosion. This can be achieved by the use of one or more of the following provisions: SIST EN 12007-5:2014

EN 12007-5:2014 (E) 12 — automatic means of isolation or flow limiting device; — manual means of isolation; — routing all or part of the service line in an area of minimum consequence; — location of all or part of the pipework in a suitable sleeve, or casing; — use of materials, components and joints that withstand high temperatures; — coating pipework with a protective material to enable the pipework to withstand high temperatures for a given period of time. Reference should be made to the national legislation/regulation. NOTE For pipework internal to the premises Annex A of EN 1775:2007 gives, as examples, two procedures (A & B) for tests on components of pipework and their jointing for resistance to high temperatures. 4.2.3 Where an electrical cable, water main or other services can potentially damage the gas service line additional protection of the service line should be considered. Where proximities required by national requirements cannot be achieved, consideration can be given to other mitigating measures. 4.2.4 Metallic service lines shall be fitted with a suitable electrical insulating joint located to fulfil this function. 4.3 Materials and components 4.3.1 General 4.3.1.1 Materials and products shall conform to the relevant European Standards and International Standards or, in their absence, to the national or other established standards and shall be of a quality fit for purpose. PE materials and components used shall comply with EN 12007-2. Steel pipes shall comply with EN 12007-3. Copper tube shall comply with EN 1057 and copper or copper alloy fittings shall comply with EN 1254 (all parts). 4.3.1.2 Characteristics such as chemical and mechanical properties or dimensions of final product or manufacturing or test procedures shall be subject to agreement between distribution system / service line operator and manufacturer subject to compliance with the relevant standard(s). 4.3.1.3 The material characteristics of pipeline components and the mode of construction of pipelines shall be a

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