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)

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 1555-1, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 1: General EN 1555-2, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 2: Pipes EN 1555-3, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 3: Fittings EN 1555-4, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 4: Valves EN 1555-5, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 5: Fitness for purpose of the system EN 12327, Gas infrastructure - Pressure testing, commissioning and decommissioning procedures - Functional requirements.

Gasinfrastruktur - Rohrleitungen mit einem maximal zulässigen Betriebsdruck bis einschließlich 16 bar - Teil 2: Besondere funktionale Anforderungen für Polyethylen (MOP bis einschließlich 10 bar)

Diese Europäische Norm beschreibt, in Ergänzung zu den allgemeinen funktionalen Anforderungen von EN 12007-1, die besonderen funktionalen Anforderungen an Rohrleitungen aus Polyethylen, einschließlich der Verbindungen zwischen PE und anderen Werkstoffen, für:
a)   einen maximal zulässigen Betriebsdruck (MOP) bis zu 10 bar;
b)   und einer Betriebstemperatur von 20 °C bis 40 °C.
Diese Europäische Norm gilt für die folgenden drei Rohrarten:
-   PE-Rohre einschließlich etwaiger Identifikationskennzeichnung;
-   PE-Rohre mit auf der Rohraußen- oder Innenseite oder außen und/oder innen aufgebrachten co-extrudierten Schichten; und
-   PE-Rohre mit einer abziehbaren, thermoplastischen Zusatzschicht auf der Rohraußenseite.
Diese Europäische Norm enthält allgemeine Grundsätze der Gasinfrastruktur. Anwender dieser Europäischen Norm sollten sich dessen bewusst sein, dass detailliertere nationale Normen und/oder 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 2: Recommandations fonctionnelles spécifiques pour polyéthylène (MOP inférieure ou égale à 10 bar)

La présente Norme européenne décrit, en complément des exigences fonctionnelles générales de l’EN 12007-1, les exigences fonctionnelles spécifiques applicables aux canalisations en polyéthylène (PE) 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.
La présente Norme européenne couvre trois types de tubes :
-   les tubes en PE, y compris toutes bandes d’identification éventuelles ;
-   les tubes en PE comportant des couches co-extrudées soit sur leur surface externe ou interne, soit sur leurs deux surfaces
-   les tubes en PE comportant une couche supplémentaire thermoplastique contiguë pelable sur leur surface externe.
La présente Norme européenne spécifie les principes de base communs pour les infrastructures gazières. Il convient que les utilisateurs de la présente Norme européenne gardent à l'esprit l'existence éventuelle, dans les pays membres du CEN, de codes de pratique et/ou de normes nationales plus détaillées. La présente Norme européenne est destinée à s'appliquer conjointement avec ces normes nationales et/ou codes de pratique, qui détaillent les principes de base précités.
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 l’emporte, 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 - 2. del: Posebne funkcionalne zahteve za polietilen (najvišji delovni tlak do vključno 10 bar)

Ta dokument se v celoti ali v delih normativno sklicuje na naslednje dokumente, ki so nepogrešljivi pri njegovi uporabi. Pri datiranih sklicevanjih se uporablja samo navedena izdaja. Pri nedatiranih sklicevanjih se uporablja zadnja izdaja referenčnega dokumenta (vključno z morebitnimi dopolnili). EN 1555-1, Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi – Polietilen (PE) – 1. del: Splošno EN 1555-2, Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi – Polietilen (PE) – 2. del: Cevi EN 1555-3, Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi – Polietilen (PE) – 3. del: Fitingi EN 1555-4, Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi – Polietilen (PE) – 4. del: Ventili EN 1555-5, Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi – Polietilen (PE) – 5. del: Ustreznost sistema namenu EN 12327, Infrastruktura za plin – Tlačni preskus, postopki za začetek in prenehanje obratovanja – Funkcionalne zahteve.

General Information

Status
Published
Public Enquiry End Date
19-Mar-2011
Publication Date
27-Dec-2012
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
12-Nov-2012
Due Date
17-Jan-2013
Completion Date
28-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 2: Besondere funktionale Anforderungen für Polyethylen (MOP bis einschließlich 10 bar)Infrastructures gazières - Canalisations pour pression maximale de service inférieure ou égale à 16 bar - Partie 2: Recommandations fonctionnelles spécifiques pour polyéthylène (MOP inférieure ou égale à 10 bar)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)91.140.40Sistemi za oskrbo s plinomGas supply systemsICS:Ta slovenski standard je istoveten z:EN 12007-2:2012SIST EN 12007-2:2013en,fr,de01-januar-2013SIST EN 12007-2:2013SLOVENSKI

STANDARDSIST EN 12007-2:20001DGRPHãþD
SIST EN 12007-2:2013
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12007-2
August 2012 ICS 23.040.20 Supersedes EN 12007-2:2000English Version

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) Infrastructures gazières - Canalisations pour pression maximale de service inférieure ou égale à 16 bar - Partie 2: Exigences fonctionnelles spécifiques pour le polyéthylène (MOP inférieure ou égale à 10 bar)

Gasinfrastruktur - Rohrleitungen mit einem maximal zulässigen Betriebsdruck bis einschließlich 16 bar - Teil 2: Spezifische funktionale Anforderungen für Polyethylen (MOP bis einschließlich 10 bar) 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 12007-2:2012: ESIST EN 12007-2:2013

EN 12007-2:2012 (E) 2 Contents Page Foreword ..............................................................................................................................................................41 Scope ......................................................................................................................................................52 Normative references ............................................................................................................................53 Terms, definitions, symbols and abbreviations .................................................................................64 Design .....................................................................................................................................................74.1 General ....................................................................................................................................................74.2 Materials and components ...................................................................................................................74.3 Maximum operating pressure ...............................................................................................................74.3.1 General ....................................................................................................................................................74.3.2 Verification of the overall service (design) coefficient ......................................................................84.3.3 Verification of the RCP criterion ..........................................................................................................84.4 Assembly techniques ......................................................................................................................... 104.5 Material properties for flow stopping by squeeze-off ..................................................................... 104.6 Pipework inside buildings ................................................................................................................. 105 Construction ........................................................................................................................................ 105.1 Storage, handling and transportation............................................................................................... 105.2 Jointing ................................................................................................................................................ 115.2.1 General ................................................................................................................................................. 115.2.2 Fusion jointing .................................................................................................................................... 115.2.3 Mechanical joints ................................................................................................................................ 125.3 Laying .................................................................................................................................................. 125.4 Connection to existing systems ........................................................................................................ 135.4.1 Static electricity .................................................................................................................................. 135.4.2 Squeeze-off .......................................................................................................................................... 136 Quality control ..................................................................................................................................... 146.1 Inspection prior to installation .......................................................................................................... 146.2 Inspection during laying .................................................................................................................... 146.2.1 Laying .................................................................................................................................................. 146.2.2 Joint integrity ...................................................................................................................................... 147 Pressure testing .................................................................................................................................. 14Annex A (informative)

Storage, handling and transportation ...................................................................... 16A.1 General ................................................................................................................................................. 16A.2 Storage ................................................................................................................................................. 16A.2.1 Storage conditions ............................................................................................................................. 16A.2.2 Bundles ................................................................................................................................................ 16A.2.3 Stacking loose straight pipes ............................................................................................................ 17A.2.4 Drums and coils .................................................................................................................................. 17A.2.5 Storing ................................................................................................................................................. 17A.2.6 First in − first out ................................................................................................................................ 18A.3 Handling ............................................................................................................................................... 18A.3.1 General ................................................................................................................................................. 18A.3.2 Handling in cold weather ................................................................................................................... 18A.3.3 Straight pipes ...................................................................................................................................... 18A.3.4 Coils ..................................................................................................................................................... 18A.3.5 Drums ................................................................................................................................................... 18A.3.6 Uncoiling .............................................................................................................................................. 19A.4 Transportation ..................................................................................................................................... 19A.4.1 Straight pipes ...................................................................................................................................... 19SIST EN 12007-2:2013

EN 12007-2:2012 (E) 3 A.4.2 Coiled pipe ........................................................................................................................................... 19A.4.3 Drums ................................................................................................................................................... 19Annex B (informative)

Fusion joint integrity .................................................................................................. 20B.1 General ................................................................................................................................................. 20B.2 Visual inspection criteria .................................................................................................................... 20B.2.1 General ................................................................................................................................................. 20B.2.2 Butt fusion guidelines for the visual examination of butt fusion joints ........................................ 20B.2.3 Electrofusion ........................................................................................................................................ 23B.2.4 Ancillary tooling .................................................................................................................................. 26Annex C (informative) Technical changes between this European Standard and EN 12007-2:2000 ........ 27Bibliography ...................................................................................................................................................... 28 SIST EN 12007-2:2013

EN 12007-2:2012 (E) 4 Foreword This document (EN 12007-2:2012) 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 12007-2:2000. Annex C 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 12007-2:2013

EN 12007-2:2012 (E) 5 1 Scope This European Standard describes the specific functional requirements for polyethylene (PE) pipelines in addition to the general functional requirements of EN 12007-1 for: a) a maximum operating pressure (MOP) up to and including 10 bar; b) an operating temperature between -20 °C and +40 °C. This European Standard covers three types of pipe:  PE pipes including any identification stripes;  PE pipes with co-extruded layers on either or both the outside and/or inside of the pipe;  PE pipes with a peelable, contiguous thermoplastics additional layer on the outside of the pipe. 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 1555-1, Plastics piping systems for the supply of gaseous fuels

Polyethylene (PE)

Part 1: General EN 1555-2, Plastics piping systems for the supply of gaseous fuels

Polyethylene (PE)
Part 2: Pipes EN 1555-3, Plastics piping systems for the supply of gaseous fuels
Polyethylene (PE)

Part 3: Fittings EN 1555-4, Plastics piping systems for the supply of gaseous fuels

Polyethylene (PE)

Part 4: Valves EN 1555-5, Plastics piping systems for the supply of gaseous fuels

Polyethylene (PE)
Part 5: Fitness for purpose of the system EN 12327, Gas infrastructure

Pressure testing, commissioning and decommissioning procedures — Functional requirements SIST EN 12007-2:2013

EN 12007-2:2012 (E) 6 ISO 12176-1, Plastics pipes and fittings
Equipment for fusion jointing polyethylene systems
Part 1: Butt fusion ISO 12176-2, Plastics pipes and fittings

Equipment for fusion jointing polyethylene systems — Part 2: Electrofusion 3 Terms, definitions, symbols and abbreviations For the purposes of this document, the following terms, definitions, symbols and abbreviations apply. 3.1

nominal outside diameter dn specified outside diameter
3.2
nominal wall thickness en

numerical designation of the wall thickness of a component, which is a convenient round number, approximately equal to the manufacturing dimension in millimetres 3.3

standard dimension ratio SDR number approximately equal to the quotient of the nominal outside diameter and the nominal wall thickness 3.4

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: no fault in any device or stream. 3.5

maximum incidental pressure MIP maximum pressure which a system can experience during a short time limited by the safety devices 3.6

butt fusion joint

method of jointing PE pipes and fittings where the two pipe ends are heated and brought together to be fused without the use of a separate fitting or filler material 3.7

electrofusion joint method of jointing PE pipes, using fittings which have an integrated electric heating element 3.8

squeeze-off act of squeezing a pipe to prevent the flow of gas 3.9

minimum required strength MRS value of the lower confidence limit rounded down to the next lower value of the R10 series when the lower confidence limit is below 10 MPa, or to the next lower value of the R20 series when the lower confidence limit is 10 MPa or greater SIST EN 12007-2:2013

EN 12007-2:2012 (E) 7 Note 1 to entry: R10 and R20 series are the Renard number series conforming to ISO 3 and ISO 497. 3.10 lower confidence limit LCL quantity, expressed in MPa, which can be considered as a material property, representing the 97,5 % lower confidence limit of the predicted long term hydrostatic strength for water at 20 °C for 50 years 3.11 critical rapid crack propagation pressure PRCP pressure level at which a rapid crack propagation (RCP) can occur in a PE pipeline, defined at a reference temperature Note 1 to entry: Reference temperature is 0 °C. 3.12 peelable pipe PE pipes with a peelable, contiguous thermoplastics additional layer on the outside of the pipe for the purpose of marking and colour identification and intended to be removed for the purposes of making welds or fusing pipe and fittings 4 Design 4.1 General The PE 80 an PE 100 products are covered by CEN/TC 155, Plastics piping systems and ducting systems. Purchasing products to CEN standards can be part of a quality programme to ensure the safety and integrity of gas systems over their design life in service. Developments in the gas market have required new kinds of PE pipe products in addition to the original PE 80 and PE 100 materials. EXAMPLE New products include thinner wall pipes for renovation and products for trenchless techniques applications. The selection of materials, SDR series, dimensions and assembling techniques shall be the responsibility of the pipeline operator. 4.2 Materials and components PE materials and components used shall comply with EN 1555-1, EN 1555-2, EN 1555-3, EN 1555-4 and EN 1555-5. Other components not covered by EN 1555-1, EN 1555-2, EN 1555-3, EN 1555-4 and EN 1555-5 shall conform to the relevant European Standards and International Standards or, in their absence, to national or other established standards and shall be fit for their purpose. 4.3 Maximum operating pressure 4.3.1 General The MOP should be selected on the basis of the gas infrastructure operating requirements provided that the MOP does not exceed 10 bar and the conditions in 4.3.2 and 4.3.3 are satisfied. SIST EN 12007-2:2013

EN 12007-2:2012 (E) 8 4.3.2 Verification of the overall service (design) coefficient The overall service (design) coefficient C shall be calculated using the formula as given below and in Figure 1 shall be greater than or equal to 2. This coefficient C takes into consideration service conditions as well as the properties and components of a pipeline. F120DSDRMOPMRSC×−××≥)( All pressures measured in bar. NOTE Derating factor (DF) is a coefficient used in the calculation of MOP which takes into account the influence of operating temperature. Derating factors are listed in EN 1555-5. 4.3.3 Verification of the RCP criterion The ratio of critical RCP pressure to MOP shall be greater than or equal to 1,5. The RCP criterion is the critical pressure, is dependent on pipe size and material, and shall be determined in accordance with EN 1555-2. The critical RCP pressure is based on a temperature of 0 °C. Where pipe temperature decreases below 0 °C the PROP/MOP ratio should be recalculated in accordance with EN 1555-5 using a value of RCP pressure determined from the minimum expected operating temperature of the pipe. The value of MOP should be reduced so as to maintain the PRCP/MOP ratio at a value greater than or equal to 1,5. See Figure 1. SIST EN 12007-2:2013

EN 12007-2:2012 (E) 9
Key P
pressure levels; PRCP

critical rapid crack propagation pressure; STPmax maximum strength test pressure; STPmin minimum strength test pressure; MIP

maximum incidental pressure; MOP maximum operating pressure. System design F120DSDRCMRSMOP×−××≤)( 1,5RCPPMOP≤ Pressure testing 1201,5−≤≤×SDRMRSSTPMOP RCP0,9PSTPMIP≤< NOTE For RCP conditions see EN 1555-2 and EN 1555-5. Figure 1 — Pressure conditions in a PE-system SIST EN 12007-2:2013

EN 12007-2:2012 (E) 10 4.4 Assembly techniques Jointing procedures can vary depending upon the PE material and sizes used. The acceptable jointing methods that shall be used are:  fusion joints; or  mechanical joints. Joints made between new and existing PE gas pipework shall be compatible with the materials being joined. The fusion jointing techniques for the construction of PE pipelines shall be butt fusion and electrofusion. Written jointing procedures, authorized by the pipeline operator, shall be available prior to the construction of a pipeline. 4.5 Material properties for flow stopping by squeeze-off When squeeze-off techniques are considered, the suitability of pipe for squeeze-off shall be established in accordance with EN 1555-2. 4.6 Pipework inside buildings The pipework element of the gas infrastructure situated in buildings shall be designed, constructed and protected so that the effects of a fire on pipework do not lead to an explosion or significant aggravation of the fire. Further guidance is given in EN 12007-1. In accessible areas service lines shall be protected from external interference. 5 Construction 5.1 Storage, handling and transportation Care shall be taken during the transport, handling and storage of pipes, fittings and other components to ensure at all stages that their specified properties and conditions, which can be affected by environmental factors, are preserved and that physical damage and distortions are avoided. EXAMPLE At low temperatures, flexibility and fracture resistance are reduced. Pipes and fittings shall be inspected and those with surface defects deeper than 10 % of the nominal wall thickness shall not be used. PE pipes and fittings stored outside are subjected to UV degradation when exposed to direct daylight. PE materials are stabilized to give protection for a UV radiation level of 3,5 GJ/m2. National bodies should give recommendations for allowed storage times in their countries. The average radiation level for one year in European countries are given in Figure 2. SIST EN 12007-2:2013

EN 12007-2:2012 (E) 11

Figure 2 — Isobaric curves of global radiation in gigajoules per square metre per year in Europe

Pipes shall not be used where it is considered that they have exceeded the maximum UV exposure limit, unless they have been tested to demonstrate acceptable performance in accordance with existing standards. Further guidance on storage, handling and transportation of PE pipes and fittings is given in Annex A. 5.2 Jointing 5.2.1 General Personnel shall be competent in appropriate jointing methods. Jointing procedures shall be carefully followed to obtain good quality joints. Cleanliness and the absence of stress are essential for reliable joints. 5.2.2 Fusion jointing Fusion equipment shall conform to ISO 12176-1 for butt fusion. Procedures on butt fusion jointing are given in ISO 21307. Fusion equipment shall conform to ISO 12176-2 for electrofusion. Refer to the manufacturer's instructions for electrofusion jointing. Consideration shall be given to the use of shielding, end caps or longer heating times when jointing in adverse weather conditions. NOTE Strong winds or cold weather can reduce the quality of the PE fusion joint when not protected. Pipes and/or fittings with fusion ends of different SDR values shall not be jointed by butt fusion. SIST EN 12007-2:2013

EN 12007-2:2012 (E) 12 The following are minimum requirements for the assembly of fusion joints:  cleaning of the pipe and/or fitting ends and the surface of the heated tools;  protection against dust and other contaminating influences;  clamping of the pipe and/or fitting ends;  verification of the alignment and the gap between fitting and/or pipe ends;  use of re-rounding clamps where pipe ovality exists;  preparation of the fusion surfaces;  marking for depth of penetration into the electrofusion sockets;  maintenance and correct functioning of the fusion equipment and check of its compatibility with the required parameters;  taking into account the fusion parameters as written in the jointing procedure. 5.2.3 Mechanical joints 5.2.3.1 General All mechanical joints shall be resistant to end load in accordance with EN 1555-3. All mechanical joints shall be assembled in accordance with the manufacturer’s instructions and the metallic parts of fittings shall be corrosion resistant or protected against corrosion. Satisfactory mechanical jointing procedures based upon recognized standards, manufacturers' instructions and the experience of the pipeline operator shall be utilised. In the absence of mechanical jointing procedures, ISO 10838-1 and ISO 10838-2 should be applied. 5.2.3.2 Flanged joints Flanged joints shall be made using the appropriate jointing material. 5.2.3.3 Threaded joints PE pipes shall not be threaded. 5.2.3.4 Compression joints Stiffener appropriate to the inside diameter of the PE-pipe shall be applied in joints with a compressive element. Only the stiffener supplied with a fitting shall be used for a given joint. Lubricants approved by the manufacturer shall only be used where specified. Where relative movement can occur, anti-shear-sleeves should be fitted. 5.3 Laying Care shall be taken to prevent damage to the pipes and fittings during the whole process of laying. SIST EN 12007-2:2013

EN 12007-2:2012 (E) 13 Changes of direction of a PE pipeline during construction shall be achieved by means of preformed bends or elbow fittings or by the natural flexibility of the PE pipe within limits. Natural flexing may be used for bend radii greater than or equal to 25 × dn mm, and for smaller radii dependant upon the SDR and material properties based on operational experience and good engineering practice. Machine bending of pipes or bending following the application of heat shall not be used. PE pipes, fittings and valves installed above ground shall be protected against mechanical interference and UV degradation. When using carrier pipes the gas pipe should be adequately supported. To prevent damage, contact with sharp edges should be avoided. When tightening or untightening a mechanical joint movement, shall not be transmitted to the pipe. EXAMPLE Torsion. Consideration shall be given during the laying process to the potential effects on the pipe of relative movements of the ground or adjacent constructions or from temperature variations. Pipes shall not be overstressed by tensile forces during laying. Where the PE pipe is laid by drag, care shall be taken that the drag force is not greater than the values (in newtons) given by the formula: ()SDRdforcedrag×××≤3142n All pressures measured in bar. Stresses caused by different temperatures between laying and operation shall be considered. Valves shall be installed so that they do not expose the PE pipe to unnecessary stress during opening and closing cycles. Material around the pipe shall be compacted so as to avoid excessive pipe ovality and shall be done layer by layer. Backfill materials around the pipe shall be selected to prevent damage to the pipe from contact with sharp edges during and after compaction. 5.4 Connection to existing systems 5.4.1 Static electricity Where there can be a release of gas in the working area, static charge accumulation shall be avoided. EXAMPLE Draping water soaked cloths of natural fibre over all pipes and fittings likely to be handled so that the cloths touch both the pipe and the ground. 5.4.2 Squeeze-off The squeeze-off procedure and tooling shall be specified by the pipeline operator. Squeeze-offs shall be located no closer than 3 × dn mm from joints and 6 × dn mm from other squeeze-offs. The squeeze-off position shall be permanently marked if the section of pipe is not replaced. SIST EN 12007-2:2013

EN 12007-2:2012 (E) 14 6 Quality control 6.1 Insp
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