1、BS EN 13941:2009ICS 91.140.10NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDDesign and installationof preinsulated bondedpipe systems fordistrict heatingIncorporatingcorrigendumNovember 2009+A1:2010 National forewordThis British Standard is the UK implementatio
2、n of EN 13941:2009+A1:2010, incorporating corrigendum November 2009. It supersedes BS EN 13941:2009 which is withdrawn.The start and finish of text introduced or altered by amendment is indicated in the text by tags. Tags indicating changes to CEN text carry the number of the CEN amendment. For exam
3、ple, text altered by CEN amendment A1 is indicated by !“.The UK participation in its preparation was entrusted to Technical Committee RHE/9, Insulated underground pipelines.A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not pu
4、rport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.BS EN 13941:2009+A1:2010This British Standard waspublished under the authorityof the Standards Policy andStr
5、ategy Committee on31 July 2009 BSI 2010Amendments/corrigenda issued since publicationDate Comments 31 January 2010 Implementation of CEN corrigendum November 2009; Inclusion of Annex E31 August 2010 Implementation of CEN amendment A1:2010ISBN 978 0 580 69522 3EUROPEAN STANDARD NORME EUROPENNE EUROPI
6、SCHE NORM EN 13941:2009+A1 July 2010 ICS 23.040.10; 91.140.10 Supersedes EN 13941:2009 English Version Design and installation of preinsulated bonded pipe systems for district heating Conception et installation des systmes bloqus de tuyaux prisols pour les rseaux enterrs deau chaude Auslegung und In
7、stallation von werkmig gedmmten Verbundmantelrohren fr die Fernwrme This European Standard was approved by CEN on 23 May 2009 and includes Corrigendum 1 issued by CEN on 11 November 2009 and Amendment 1 approved by CEN on 15 May 2010. CEN members are bound to comply with the CEN/CENELEC Internal Reg
8、ulations 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 Management Centre or to any CEN member. Thi
9、s 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 Management Centre has the same status as the official versions. CEN members are
10、the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,
11、 Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref
12、. No. EN 13941:2009+A1:2010: EEN 13941:2009+A1:2010 (E) 2 Contents Page Foreword . 5Introduction . 61 Scope 82 Normative references 83 Terms and definitions, units and symbols . 103.1 Terms and definitions . 103.2 Units and symbols 153.2.1 Units 153.2.2 Symbols 164 General considerations for system
13、design 184.1 General requirements . 184.2 Service life 184.3 Preliminary investigations 184.4 Determination of project class . 194.4.1 Risk assessment . 194.4.2 Project classes 204.5 Design documentation 224.5.1 General . 224.5.2 Operational data 224.5.3 Data related to the pipeline 224.5.4 Specific
14、ations for quality control 245 Components and materials 255.1 Basic requirements . 255.1.1 !General“ 255.1.2 !Non standardised components“ . 255.2 Steel pipe components . 255.2.1 General . 255.2.2 Technical delivery conditions and documentation . 265.2.3 Characteristic values for steel . 265.2.4 Spe
15、cific requirements for bends and tees 275.2.5 Specific requirements for reducers and extensions . 285.2.6 Specific requirements for other components 285.3 Polyurethane foam insulation 285.4 PE casing . 295.5 Expansion cushions . 295.6 Valves and accessories 295.6.1 General requirements . 295.6.2 Mar
16、king and documentation 296 Actions and limit states 306.1 General . 306.2 Simplified analysis procedure . 326.3 Actions . 326.3.1 General . 326.3.2 Classification of actions . 326.4 Limit states. 346.4.1 General . 346.4.2 Limit states for service pipes of steel . 346.4.3 Composite stress conditions
17、. 42BS EN 13941:2009+A1:2010EN 13941:2009+A1:2010 (E) 3 6.4.4 Limit states for PUR and PE . 436.4.5 Limit state for PE . 436.4.6 Limit states for valves 447 Installation . 447.1 General . 447.2 Transportation and storage . 457.3 Excavation of pipe trench 457.4 Installation of pipes and components. 4
18、57.4.1 General . 457.4.2 Steel pipes . 467.4.3 PUR-PE Joints . 467.4.4 Accessories . 467.4.5 Expansion zones . 467.5 Welding of the steel pipe and testing of the steel welds 467.5.1 General . 467.5.2 Quality system for the different project classes 477.5.3 Qualification of the welding procedures 497
19、.5.4 Welding consumables 497.5.5 Place and position of the weld . 497.5.6 Performance of welding work 497.5.7 Special procedures . 527.5.8 Documentation 547.6 Strength pressure test and leak tightness test 547.7 Assembly of casing pipes, joint installation and site insulation . 557.8 Backfilling of
20、trench 557.9 Pipe bends and other components . 567.9.1 Pipe bends . 567.9.2 Branches 567.9.3 Valves and accessories 577.10 Setting into operation . 577.10.1 General . 577.10.2 Filling with water for initial operation . 577.10.3 Surveillance system 577.11 Special constructions . 587.11.1 Special comp
21、onents . 587.11.2 Above-ground pipelines with preinsulated pipes 587.11.3 Insertion into casing pipe . 587.12 Construction work during the operation stage 58Annex A (normative) Design of piping components under internal pressure . 60A.1 General . 60A.2 Symbols . 60A.3 Straight pipe and bends . 61A.4
22、 Tees and branch connections . 61A.5 Reducers and extensions . 64A.6 Dished ends . 65Annex B (informative) Geotechnics and pipe-soil interaction . 67B.1 Scope 67B.2 Symbols and units 67B.3 Soil parameters for global analysis (pipe-soil interaction) . 68B.4 Characteristic values for soil loads and so
23、il parameters . 78B.5 Specific requirements for stability 79B.6 Specific requirements for parallel excavations . 82B.7 Requirements for soft soils and settlement areas . 82B.8 Ovalization and circumferential stresses from top load . 82Annex C (informative) Global- and cross sectional analysis . 89C.
24、1 General . 89C.2 Symbols . 89BS EN 13941:2009+A1:2010EN 13941:2009+A1:2010 (E) 4 C.3 Survey of limit states for steel . 91C.4 Locations to be assessed . 92C.5 Actions . 95C.6 Global analysis 96C.7 Calculation of stresses . 103C.8 Fatigue analysis 119C.9 Further actions 120Annex D (informative) Calc
25、ulation of heat losses . 121D.1 General . 121D.2 Heat loss per pipe pair 121D.3 Insulance of the soil 122D.4 Insulance of the insulation material 122D.5 Insulance of the heat exchange between flow and return pipe 123Annex E (informative) National A-deviations 124Bibliography 125BS EN 13941:2009+A1:2
26、010EN 13941:2009+A1:2010 (E) 5 Foreword This document (EN 13941:2009+A1:2010) has been prepared by Technical Committee CEN/TC 107 “Prefabricated district heating pipe systems”, the secretariat of which is held by DS. This European Standard shall be given the status of a national standard, either by
27、publication of an identical text or by endorsement, at the latest by January 2011, and conflicting national standards shall be withdrawn at the latest by January 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CEN
28、ELEC shall not be held responsible for identifying any or all such patent rights. This document includes Corrigendum 1 issued by CEN on 11 November 2009 and Amendment 1 approved by CEN on 15 May 2010. This document supersedes !EN 13941:2009“. The start and finish of text introduced or altered by ame
29、ndment is indicated in the text by tags!“XThe modifications of the related CEN Corrigendum have been implemented at the appropriate places in the text and are indicated by the tags . According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries ar
30、e bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Sp
31、ain, Sweden, Switzerland and the United Kingdom. BS EN 13941:2009+A1:2010EN 13941:2009+A1:2010 (E) 6 Introduction The standard has been prepared by JWG1, a joint working group with CEN/TC 267 “Industrial piping and pipelines“. According to the scope from CEN/TC 107: The task of CEN/TC 107/TC267/JWG1
32、 is to specify rules for design, calculation and installation for preinsulated bonded pipe systems for underground hot water networks with pipe assemblies co-ordinated with EN 253, EN 448, EN 488 and EN 489. CEN/TC 107/TC267/JWG1 may also specify rules for functional tests for preinsulated bonded pi
33、pe systems for underground hot water networks. The basic rules for design, calculation and installation should be based on functional requirements. The purpose of the work is to provide uniform basis for the design, construction and operation of district heating systems, to ensure that the system is
34、 reliable and efficient and safe for the surrounding area, the environment and public health. Joint assemblies for pipe systems dealt with should be co-ordinated with EN 489. This standard takes account of experience acquired, of new knowledge available, of the behaviour of material and of distribut
35、ion of stresses and allowable deformations and also evolution in installation techniques. When use is made of the standard, the different sections of which it is made up must be interpreted as being interdependent and, because of this, cannot be dissociated. The standard consists of a main part and
36、four annexes. Depending on the character of the individual clauses, distinction is made in this standard between Principles and Application Rules. The principles comprise: general statements, definitions and requirements, for which there is no alternative, as well as requirements and analytical mode
37、ls for which no alternative is permitted unless specifically stated. The principles are printed in normal typeface (10 point font). The application rules are generally recognised rules, which follow the principles and satisfy their requirements. Application rule: The application rules and comments t
38、o principles and application rules are printed in a 8 point font. This is an application rule. It is permissible to use alternative design rules from the application rules given in this standard, provided that it is shown that the alternative rule accords with the relevant principles and it is at le
39、ast equivalent with regard to the resistance, serviceability and durability achieved by the system. Annex A is part of the standard (principles). Annexes B, C and D have status as application rules. BS EN 13941:2009+A1:2010EN 13941:2009+A1:2010 (E) 7 This standard contains a number of requirements a
40、imed at ensuring the sound execution of distribution networks for district heating. To the extent possible, the requirements specified in this standard are functional requirements. The requirements and regulations contained in this standard should be assessed and applied in compliance with the inten
41、tions of the standard and in due consideration of the development taking place in the field it concerns. It is therefore assumed that the user of the standard has the requisite technical insight and that the user of the standard has adequate knowledge of legal and other external regulations that are
42、 of consequence to the practical application of the standard. Special cases may occur within the scope of this standard in which its contents do not cover. An evaluation whether the contents cover shall be made in any specific case where the standard is used. Presently CEN/TC 107 “Pre-fabricated dis
43、trict heating pipe systems“ is preparing standards for preinsulated flexible pipes and surveillance systems. BS EN 13941:2009+A1:2010EN 13941:2009+A1:2010 (E) 8 1 Scope This European Standard specifies rules for design, calculation and installation for preinsulated bonded pipe systems for buried hot
44、 water distribution and transmission networks (cf. Figure 2) with pipe assemblies in accordance with EN 253, for continuous operation with hot water at various temperatures up to 120C and occasionally with peak temperatures up to 140C and maximum internal pressure 25 bar (overpressure). Application
45、rule: For larger pipe dimensions and pressures below 25 bar wall thickness bigger than specified in EN 253 can be required for straight pipes, bends and tees. The principles of the standard can be applied to preinsulated pipe systems with pressures higher than 25 bar, provided that special attention
46、 is paid to the effects of pressure. Adjacent pipes belonging to the network (e.g. pipes in ducts, valve chambers, road crossings above ground etc.) can be designed and installed according to this standard. The standard assumes use of treated water, which by softening, demineralisation, deaeration,
47、adding of chemicals, or otherwise has been treated to prevent internal corrosion and deposits in the pipes. This standard is not applicable for such units as: a) pumps, b) exchangers, c) boiler installations, tank installations, d) consumer installations. However, the full functional ability and dur
48、ability of such units should be ensured in consideration of the impacts from the district heating system and other impacts occurring from the conditions under which they have been installed. Guidelines for product quality inspection and in situ tests of joints are given in Annex A of EN 448:2009, Annex D of EN 253:2009, Annex A of EN 488:2009 and Annex B of EN 489:2009. Guidelines f
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