Bsi bs en 12007 2 2012

BS EN 12007-2:2012 BSI Standards Publication 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) BS EN 12007-2:2012 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 12007-2:2012 It supersedes BS EN 12007-2:2000 which is withdrawn The UK participation in its preparation was entrusted to Technical Committee GSE/33, Gas supply A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2012 Published by BSI Standards Limited 2012 ISBN 978 580 68891 ICS 75.200 Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2012 Amendments issued since publication Date Text affected BS EN 12007-2:2012 EN 12007-2 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM August 2012 ICS 23.040.20 Supersedes EN 12007-2:2000 English 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 16 bar - Partie 2: Exigences fonctionnelles spécifiques pour le polyéthylène (MOP inférieure ou égale 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: E BS EN 12007-2:2012 EN 12007-2:2012 (E) Contents Page Foreword 4 Scope 5 Normative references 5 Terms, definitions, symbols and abbreviations 6 4.1 4.2 4.3 4.3.1 4.3.2 4.3.3 4.4 4.5 4.6 Design .7 General 7 Materials and components 7 Maximum operating pressure .7 General 7 Verification of the overall service (design) coefficient 8 Verification of the RCP criterion 8 Assembly techniques 10 Material properties for flow stopping by squeeze-off 10 Pipework inside buildings 10 5.1 5.2 5.2.1 5.2.2 5.2.3 5.3 5.4 5.4.1 5.4.2 Construction 10 Storage, handling and transportation 10 Jointing 11 General 11 Fusion jointing 11 Mechanical joints 12 Laying 12 Connection to existing systems 13 Static electricity 13 Squeeze-off 13 6.1 6.2 6.2.1 6.2.2 Quality control 14 Inspection prior to installation 14 Inspection during laying 14 Laying 14 Joint integrity 14 Pressure testing 14 Annex A (informative) Storage, handling and transportation 16 A.1 General 16 A.2 Storage 16 A.2.1 Storage conditions 16 A.2.2 Bundles 16 A.2.3 Stacking loose straight pipes 17 A.2.4 Drums and coils 17 A.2.5 Storing 17 A.2.6 First in − first out 18 A.3 Handling 18 A.3.1 General 18 A.3.2 Handling in cold weather 18 A.3.3 Straight pipes 18 A.3.4 Coils 18 A.3.5 Drums 18 A.3.6 Uncoiling 19 A.4 Transportation 19 A.4.1 Straight pipes 19 BS EN 12007-2:2012 EN 12007-2:2012 (E) A.4.2 A.4.3 Coiled pipe 19 Drums 19 Annex B (informative) Fusion joint integrity 20 B.1 General 20 B.2 Visual inspection criteria 20 B.2.1 General 20 B.2.2 Butt fusion guidelines for the visual examination of butt fusion joints 20 B.2.3 Electrofusion 23 B.2.4 Ancillary tooling 26 Annex C (informative) Technical changes between this European Standard and EN 12007-2:2000 27 Bibliography 28 BS EN 12007-2:2012 EN 12007-2:2012 (E) 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 To be published BS EN 12007-2:2012 EN 12007-2:2012 (E) 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 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 BS EN 12007-2:2012 EN 12007-2:2012 (E) 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 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 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 BS EN 12007-2:2012 EN 12007-2:2012 (E) Note to entry: R10 and R20 series are the Renard number series conforming to ISO 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 to entry: Reference temperature is °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 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 applications New products include thinner wall pipes for renovation and products for trenchless techniques 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 4.3.1 Maximum operating pressure 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 BS EN 12007-2:2012 EN 12007-2:2012 (E) 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 shall be greater than or equal to This coefficient C takes into consideration service conditions as well as the properties and components of a pipeline C≥ 20 × MRS MOP × ( SDR − 1) × DF 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 °C Where pipe temperature decreases below °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 BS EN 12007-2:2012 EN 12007-2:2012 (E) Annex A (informative) Storage, handling and transportation A.1 General PE pipes are available in coils, drums or in straight lengths in accordance with EN 1555-2 The correct storage, handling and transportation of the PE pipes and fittings should be ensured at all times, to fulfil the specified conditions when they are used The PE pipes and fittings should be correctly stored, handled and transported to ensure continued fitness for purpose Reference is made to Clause 5.1 A.2 Storage A.2.1 Storage conditions PE pipes and fittings should be stored so as to minimize the possibility of the material being damaged by crushing, piercing or extended exposure to direct daylight Straight pipes should be stacked on a reasonably flat surface, free from sharp objects, stones or projections likely to deform or damage them Special care should be taken under site conditions Fittings should be stored in their original packing, until ready for use Contact with aggressive chemical products like liquid hydrocarbons should be avoided A.2.2 Bundles Pipe bundles should not be stacked unless the supporting frames are equally spaced to transfer safely the load from bundle to bundle through the corresponding frame and to avoid distortion of the pipe and facilitate safe lifting of bundles The supporting frames in stacks should not be nailed together, (see section A-A, Figure A.1) The distance X should be agreed between manufacturer and pipeline operator and should not exceed 2,5 m (see Figure A.1) 16 BS EN 12007-2:2012 EN 12007-2:2012 (E) Key A-A x section A to A cut A to A supporting frame Figure A.1 — Pipe bundles in supported frames A.2.3 Stacking loose straight pipes Where individual straight pipe lengths are stacked in pyramidal fashion, deformation can occur in the lower layers, particularly in warm weather Therefore, such stacks should not exceed a height of m The maximum height for stacking PE straight pipes depends on many factors such as material, size, wall thickness and ambient temperatures However, at no time should the loading cause the pipe section to be forced out of shape The manufacturer’s stacking recommendations should always be followed For long periods of storage at high ambient temperatures consideration should be given to fitting end caps to minimize pipe end distortion for large diameter thin wall thickness pipes EXAMPLE dn > 250 mm, SDR 26 A.2.4 Drums and coils PE pipes may be coiled or packed on drums Consideration should be given to avoiding single point contact of the coils Attention should be paid to the weight of loaded drums which can usually be from 000 kg to more than 000 kg A.2.5 Storing In case of outside storage, the cumulative exposure period should be determined with reference to the Pipe Production Code marked on the pipe which includes the date of manufacture Using this date and the received UV radiation levels at the storage site checks can be made for total UV exposure, see 5.1 Storage time may be extended by protecting the pipe from UV radiation NOTE Covering of the pipe to protect it against UV exposure can sometimes create excessive heat which can also be detrimental to the pipe performance 17 BS EN 12007-2:2012 EN 12007-2:2012 (E) For more exact assessment radiation instrumentation can be employed especially for long-term storage sites under strong UV-conditions A.2.6 First in − first out In managing storage sites the exposure time should be minimized by issuing from store on a “first in − first out“ rotation with the date of manufacture used as control The pipe with the earliest date of manufacture should be issued first for installation The same "first in − first out" principle should also be used for fittings A.3 Handling A.3.1 General Care should be taken to avoid excessive damage If handling equipment is used in contact with the pipes, a protection to avoid damage should be provided If handling equipment is not used, techniques which are not likely to damage the pipes and/or fittings should be chosen Metal chains or slings should not be used in direct contact with the pipe EXAMPLE During loading and unloading operations When pipes are dragged along the ground, roller units or skids should be employed to minimize damage A.3.2 Handling in cold weather At low temperatures, flexibility and fracture resistance are reduced and more care should be taken when handling PE pipes and components, especially fittings with fusion joints A.3.3 Straight pipes Initial handling and storage of straight pipes should be made with the pipe in packaged form, thus minimizing damage during this phase When loading, unloading or handling, mechanical equipment should be used to move or stack the packs A.3.4 Coils Coils of pipe stacked on pallets can easily be handled using a forklift truck Individual coils should not be rolled off the edge of the loading platforms or trailers These coils should be slung individually when off-loading with a crane A.3.5 Drums Taking account of their weight, handling of drums should be helped by mechanical equipment Special trailers make it easier and safer Before installing the pipe in the trench or by insertion it should be ensured that the drum is placed correctly and that its axle is steady during the unrolling operation 18 BS EN 12007-2:2012 EN 12007-2:2012 (E) A.3.6 Uncoiling Especially at low temperatures particular care should be taken during uncoiling operations to protect the operator against effects of uncontrolled spring back of the pipe While unrolling from drums the rotation rate should be checked and care should be taken that the pipe is not damaged If PE pipes have been unrolled, care should be exercised when cutting the required length at its bending part situated near the drum or the coil A.4 Transportation A.4.1 Straight pipes When transporting straight pipes, the vehicle bed should be free from nails and other protuberances likely to damage the pipe The pipes should have sufficient support to minimize bending stresses likely to damage the pipe and to avoid pipe deformation The vehicles should have side supports and the pipes should be secured effectively during transportation All posts should be flat with no sharp edges During transportation, the pipes should be continuously supported to minimize movement between the pipes and their supports A.4.2 Coiled pipe Coiled pipe with dn ≤ 63 mm may be supplied on pallets The coils should be firmly secured to the pallets, which should in turn be firmly secured to the vehicle Coiled pipe with dn > 63 mm should be supplied individually There should be facilities to restrain each coil securely throughout transit and the loading process A.4.3 Drums The drum should be firmly attached to the vehicle and its height and width should be considered in planning the intended route 19 BS EN 12007-2:2012 EN 12007-2:2012 (E) Annex B (informative) Fusion joint integrity B.1 General All fusion joints should be visually inspected in the field The quality of the joint depends on the strict adherence to the written and authorized fusion procedure, the use of well maintained equipment conforming to the relevant specification and the competence of fusion operators B.2 Visual inspection criteria B.2.1 General Attention should be drawn to the following visual inspection criteria, which are suitable for quality control of fusion joints B.2.2 Butt fusion guidelines for the visual examination of butt fusion joints B.2.2.1 Bead symmetry Good quality joints should have a smooth symmetrical bead shape around the entire pipe circumference as shown in Figure B.1 The bead depression "A" should not extend below the pipe surface An unsymmetrical bead profile between the same components should initially be considered as indicative of poor joint quality and therefore an assessment by an authorized person should be undertaken Where the pipes and/or fittings have different melt mass flow rates (MMFR) the bead can be unsymmetrical but still satisfactory In assessing the results of the joint tests under standard conditions acceptable levels of symmetry should be determined Figure B.1 – Symmetrical bead shape around the entire pipe circumference 20 BS EN 12007-2:2012 EN 12007-2:2012 (E) B.2.2.2 Alignment The alignment of pipes, fittings and valves, see Figure B.2, should be as closely aligned as possible The operator should visually verify that there is no misalignment of the pipes before jointing The maximum allowable misalignment is defined in ISO 11414 Figure B.2 – Alignment of pipes, fittings and valves B.2.2.3 Bead width The bead width B, see Figure B.3, is influenced by the PE material, the production type (extruded or injection moulded), the type and temperature of the heater plate and the applied fusion cycle; consequently it is difficult to specify a single set of bead width values It is however a good indicator that the necessary fusion procedure has been followed One method of determining acceptable bead width value B is experimentally with pipe and butt fusion machines operating at the specified conditions The mean value B is determined from several joints made under the conditions defined in the written fusion procedures The measured bead width B should not exceed ±20 % of this mean value The use of GO and NO-GO gauges, manufactured to the recommended values, could facilitate the control, see Figure B.5 Variation in the bead width of a single joint, see Figure B.3 indicates a poor condition of the fusion equipment and should be strictly limited Figure B.3 – Bead width B.2.2.4 Bead removal Removal of the external fusion bead, using appropriate tooling, is possible without damage to the pipe, see Figure B.4 The removed bead is then available for inspection 21 BS EN 12007-2:2012 EN 12007-2:2012 (E) Figure B.4 – Bead removal Bead gauges can be used to assess the bead width, see Figure B.5 A visual examination of the underside of the bead can be undertaken; evidence of contamination, holes, offsets and melt damage should be cause for rejection Figure B.5 – Bead gauges The bead should be solid and rounded with a broad root as shown in Figure B.6 Hollow beads with a thin root and curled appearance could have been formed with excessive pressure or no heat soak 22 BS EN 12007-2:2012 EN 12007-2:2012 (E) Key correct thin root (incorrect) reject(incorrect) curling(incorrect) Figure B.6 – Correct and incorrect shape of beads A bend back test, see Figure B.7 every few centimetres and observation for the presence of slit defects should be made Slit defects are indicative of fine dust contamination entrained within the fusion interface, possibly arising from contact with a dirty heater plate Figure B.7 – Bend back test B.2.3 Electrofusion B.2.3.1 B.2.3.1.1 Electrofusion socket Pipe alignment It should be checked that the pipes and fittings have been properly aligned conforming to the written jointing procedures B.2.3.1.2 Scraping PE and removing the skin from peelable pipe It should be checked that an efficient scraping in accordance with the written jointing procedures over the entire circumference has been carried out, see Figure B.8 23 BS EN 12007-2:2012 EN 12007-2:2012 (E) There should be clear evidence of scraping on either side of the socket Particular attention should be given to the inspection of the bottom of the pipe Figure B.8 – Scraping The outer skin of peelable pipe shall be removed under clean conditions, according to the manufacturer's instructions for the type of joint, and using the exposure tool provided to avoid cutting into the body of the pipe B.2.3.1.3 Penetration The presence of depth of penetration marking should be checked to confirm that complete penetration of pipe or spigot ends has been achieved, see Figure B.9 Figure B.9 – Penetration marking B.2.3.1.4 Melt material It should be checked that melt from the fusion process or fusion wires have not exuded outside the confines of the fitting, see Figure B.10 Figure B.10 – Incorrect fusion criteria for melt from fusion process or fusion wires 24 BS EN 12007-2:2012 EN 12007-2:2012 (E) B.2.3.1.5 Heating indicators If the fitting is designed with heating indicators they should be in a position complying with the manufacturer’s instructions after fusion has been completed see Figure B.11 Figure B.11 – Fitting with heating indicators B.2.3.1.6 Cooling time The clamp should not be removed before the cooling time has elapsed B.2.3.1.7 Electric wire position Abnormal displacement after fusion of the electric coils should not occur B.2.3.2 B.2.3.2.1 Saddle or tapping tee Scraping It should be checked that an efficient scraping in accordance with the written jointing procedures over the entire fusion area has been carried out with the use of a suitable tool, see Figure B.12 When the fusion area includes the entire circumference of the pipe particular attention should be given to the inspection of the bottom of the pipe Figure B.12 – Scraping 25 BS EN 12007-2:2012 EN 12007-2:2012 (E) B.2.3.2.2 Visual control The stack of the saddle should be perpendicular to the central line of the main The fitting should not collapse the pipe Nowhere should melt from the fusion process exude outside the confines of the saddle, see Figure B.13 Figure B.13 – Visual control of confines of the saddle The outer skin of peelable pipe shall be removed under clean conditions, according to the manufacturer's instructions for the type of joint, and using the suitable tool provided to avoid cutting into the body of the pipe B.2.3.2.3 Heating indicators If the fitting is designed with heating indicators they should be in a position complying with the manufacturer’s instructions after fusion has been completed, see Figure B.11 B.2.3.2.4 Cooling time Clamps should not be removed nor the joints disturbed before the cooling time has elapsed B.2.4 Ancillary tooling The application of ancillary tooling should not result in significant damage to pipe surfaces adjacent to the fusion joint EXAMPLE 26 Pipe clamps BS EN 12007-2:2012 EN 12007-2:2012 (E) Annex C (informative) Technical changes between this European Standard and EN 12007-2:2000 Clause Change Title Change of "recommendation" in the title to "requirement reflecting the main character of the text General Change of recommendations in the text to requirements where technically appropriate General Update of normative references 3.13 Addition of definition for peelable layer pipe 4.1 Provision for the introduction of new PE products apart from PE 80 and PE 100 4.3 The term RCP is used instead of ROP to describe rapid crack propagation 4.4 It is clarified that acceptable jointing techniques are butt fusion and electrofusion 5.2.2 ISO 11413/4 was replaced by ISO 21307 B 2.2.2 Replacement of figure B.2 with new drawing Reference is made to ISO 11414 27 BS EN 12007-2:2012 EN 12007-2:2012 (E) Bibliography [1] CEN/TR 13737 (all parts), Implementation Guide for functional standards prepared by CEN/TC 234 Gas infrastructure [2] EN 12007-1, Gas infrastructure ― Pipelines for maximum operating pressure up to and including 16 bar — Part 1: General functional requirements [3] EN 12007-3, Gas supply systems ― Pipelines for maximum operating pressure up to and including 16 bar — Part 3: Specific functional recommendations for steel [4] EN 12007-4, Gas infrastructure ― Pipelines for maximum operating pressure up to and including 16 bar — Part 4: Specific functional recommendations for renovation [5] ISO 3, Preferred numbers ― Series of preferred numbers [6] ISO 497, Guide to the choice of series of preferred numbers and of series containing more rounded values of preferred numbers [7] ISO 10838-1, Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels ― Part 1: Metal fittings for pipes of nominal outside diameter less than or equal to 63 mm [8] ISO 10838-2, Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels ― Part 2: Metal fittings for pipes of nominal outside diameter greater than 63 mm [9] ISO 11413, Plastics pipes and fittings ― Preparation of test piece assemblies between a polyethylene (PE) pipe and an electrofusion fitting [10] ISO 11414, Plastics pipes and fittings ― Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test assemblies by butt fusion [11] ISO 21307, Plastics pipes and fittings ― Butt fusion jointing procedures for polyethylene (PE) pipes and fittings used in the construction of gas and water distribution systems 28 This page deliberately left blank NO 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