1、BSEN253:2009ICS23.040.10NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAWBRITISHSTANDARDDistrictheatingpipesP reinsulatedbondedpipesystemsfordirectlyburiedhotwaternetworksP ipeassemblyofsteelservicepipe,polyurethanethermalinsulationandoutercasingofpolyethyleneBS EN 253:2009 +A1:2013+A2:20
2、15BS EN 253:2009+A2:2015ISBN 978 0 580 84650 2Amendments/corrigenda issued since publicationDate Comments30 April 2013 Implementation of CEN amendment A1:201331 October 2015 Implementation of CEN amendment A2:2015This British Standard was published under the authority of the Standards Policy and Str
3、ategy Committee on 31 January 2009 The British Standards Institution 2015. Published by BSI Standards Limited 2015National forewordThis British Standard is the UK implementation of EN 253:2009+A2:2015. It supersedes BS EN 253:2009+A1:2013 which is withdrawn.The start and finish of text introduced or
4、 altered by amendment is indicated in the text by tags. Tags indicating changes to CEN text carry the number of the CEN amendment. For example, text altered by CEN amendment A1 is indicated by The UK participation in its preparation was entrusted to Technical Committee RHE/9, Insulated underground p
5、ipelines.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.Compliance with a British Standard cannot confer immun
6、ity from legal obligations.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 253:2009+A2 October 2015 ICS 23.040.10 Supersedes EN 253:2009+A1:2013English Version District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assembly of steel service pipe,
7、 polyurethane thermal insulation and outer casing of polyethylene Tuyaux de chauffage urbain - Systmes bloqus de tuyaux prisols pour les rseaux deau chaude enterrs directement - Tube de service en acier, isolation thermique en polyurthane et tube de protection en polythylne Fernwrmerohre - Werkmig g
8、edmmte Verbundmantelrohrsysteme fr direkt erdverlegte Fernwrmenetze - Verbund-Rohrsystem, bestehend aus Stahl-Mediumrohr, Polyurethan-Wrmedmmung und Auenmantel aus Polyethylen This European Standard was approved by CEN on 14 December 2012 and includes Amendment 2 approved by CEN on 17 July 2015. CEN
9、 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 appl
10、ication 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 Ma
11、nagement 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, Lat
12、via, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marn
13、ix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 253:2009+A2:2015 EEN 253:2009+A2:2015 (E) 2 Contents Page European foreword 5 Introduction . 6 1 Scope . 7 2 Normative references . 7 3 Terms and definitio
14、ns 8 4 Requirements . 10 4.1 General 10 4.2 Steel service pipe . 11 4.2.1 Specification 11 4.2.2 Diameter . 11 4.2.3 Wall thickness 12 4.2.4 Surface condition 13 4.3 Casing. 14 4.3.1 Material properties 14 4.3.2 Casing properties 14 4.4 Polyurethane rigid foam insulation (PUR) 16 4.4.1 Composition 1
15、6 4.4.2 Cell structure 16 4.4.3 Compressive strength 16 4.4.4 Foam density . 16 4.4.5 Water absorption at elevated temperature . 16 4.5 Pipe assembly . 17 4.5.1 General 17 4.5.2 Pipe ends 17 4.5.3 Diameter and wall thickness of the casing . 17 4.5.4 Centre line deviation 18 4.5.5 Expected thermal li
16、fe and long term temperature resistance 18 4.5.6 Thermal conductivity in unaged condition 18 4.5.7 Thermal conductivity at artificially aged condition . 19 4.5.8 Impact resistance 19 4.5.9 Long term creep resistance and modulus 19 4.5.10 Surface conditions at delivery 19 4.5.11 Measuring wires for s
17、urveillance systems . 19 5 Test methods 19 5.1 General conditions and test specimens 19 5.1.1 General conditions 19 5.1.2 Test specimens . 19 5.2 Casing. 20 5.2.1 Appearance and surface finish . 20 5.2.2 Elongation at break 20 5.2.3 Carbon black dispersion, homogeneity . 21 5.2.4 Stress crack resist
18、ance test . 21 5.3 Polyurethane rigid foam insulation (PUR) 22 5.3.1 Composition 22 5.3.2 Cell structure 22 BS EN 253:2009+A2:2015EN 253:2009+A2:2015 (E) 3 5.3.3 Compressive strength 22 5.3.4 5.3.4 Foam density 23 5.3.5 5.3.5 Water absorption 23 5.4 Pipe assembly . 23 5.4.1 Axial shear strength 23 5
19、.4.2 Tangential shear strength 25 5.4.3 Shear strength of the pipe assembly after ageing 27 5.4.4 Thermal conductivity in unaged condition 27 5.4.5 Thermal conductivity at artificially aged condition . 27 5.4.6 Impact resistance. 27 5.4.7 Long term creep resistance and modulus at 140 C 27 6 Marking
20、. 30 6.1 General 30 6.2 Steel service pipe . 30 6.3 Casing . 30 6.4 Pipe assembly . 31 Annex A (informative) Relation between actual continuous operating conditions and accelerated ageing test conditions 32 Annex B (informative) Calculation of the minimum expected thermal life with operation at vari
21、ous temperatures with respect to PUR foam performance 34 Annex C (normative) !Calculated Continuous Operating Temperature (CCOT)“ 35 C.1 General 35 C.2 Principle 35 C.3 Symbols . 35 C.4 Ageing and shear strength determinations . 36 C.5 Calculations . 36 C.5.1 Determination of the thermal life at dif
22、ferent ageing temperatures . 36 C.5.2 Adoption to the Arrhenius relation. 36 C.5.3 Calculated continuous operating temperature, CCOT 37 Annex D (informative) Guidelines for inspection and testing 38 D.1 General 38 D.2 Manufacturers type test . 38 D.3 Manufacturers quality control . 38 D.4 External i
23、nspection . 38 D.5 Manufacturers responsibility 38 Annex E (informative) Radial creep behaviour of the polyurethane foam (PUR) . 42 Annex F (normative) Thermal conductivity of pre-insulated pipes - Test procedure 43 F.1 Scope 43 F.2 Requirements (EN ISO 8497:1996, Clause 5) . 43 F.2.1 Test specimen
24、(EN ISO 8497:1996, 5.1) . 43 F.2.2 Operating temperature (EN ISO 8497:1996, 5.2) . 43 F.2.3 Types of apparatus (EN ISO 8497:1996, 5.5) . 43 BS EN 253:2009+A2:2015EN 253:2009+A2:2015 (E) 4 F.3 Apparatus (EN ISO 8497:1996, Clause 7) 43 F.3.1 Guarded end apparatus 43 F.3.2 Calibrated end apparatus . 43
25、 F.3.3 Dimensions (EN ISO 8497:1996, 7.2) . 44 F.3.4 Heater pipe surface temperature 44 F.4 Test specimens (EN ISO 8497:1996, Clause 8). 44 F.4.1 Conditioning (EN ISO 8497:1996, 8.4) . 44 F.4.2 Dimension measurement (EN ISO 8497:1996, 8.5) 44 F.4.3 Surface temperature measurement . 44 F.4.4 Location
26、 of temperature sensors (EN ISO 8497:1996, 8.6) 44 F.5 Procedure (EN ISO 8497:1996, Clause 9) 44 F.5.1 Test length (EN ISO 8497:1996, 9.1.1) . 44 F.5.2 Diameter (EN ISO 8497:1996, 8.5) 44 F.5.3 Thickness of casing . 44 F.5.4 Ambient requirements (EN ISO 8497:1996, 9.2) . 45 F.5.5 Test pipe temperatu
27、re (EN ISO 8497:1996, 9.3) 45 F.5.6 Power supply (EN ISO 8497:1996, 7.9) 45 F.5.7 #Axial heat loss$ 45 F.5.8 Test period and stability (EN ISO 8497:1996, 9.5.3) . 45 F.6 Calculations (EN ISO 8497:1996, Clause 11). 45 F.6.1 Thermal conductivity (EN ISO 8497:1996, 3.5) 45 F.7 Symbols and units (EN ISO
28、 8497:1996 Clause 4) 46 Annex G (informative) National A-deviations 48 G.1 Swedish national legislative deviations on steel service pipes 48 Annex H (informative) Main changes from the previous edition of EN 253 . 49 Annex I (informative) Waste treatment and recycling . 52 Bibliography 53 BS EN 253:
29、2009+A2:2015EN 253:2009+A2:2015 (E) 5 European foreword This document (EN 253:2009+A2:2015) 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 standa
30、rd, either by publication of an identical text or by endorsement, at the latest by April 2016, and conflicting national standards shall be withdrawn at the latest by April 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN
31、and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document includes Amendment 1, approved by CEN on 2012-12-14, and Amendment 2, approved by CEN on 2015-07-17. The start and finish of text introduced or altered by amendment is indicated in the text by t
32、ags !“ and #$. This document supersedes #EN 253:2009+A1:2013$. Annex H provides details of significant technical changes between this European Standard and the previous editions. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bo
33、und 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, Portug
34、al, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 253:2009+A2:2015EN 253:2009+A2:2015 (E) 6 Introduction This specification is part of the standards for bonded systems using polyurethane foam thermal insulation applied to bond to a steel service pipe a
35、nd a polyethylene casing. The other standards from CEN/TC 107 covering this subject are: EN 448, District heating pipes Preinsulated bonded pipe systems for directly buried hot water networks Fitting assemblies of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene;
36、 EN 488, District heating pipes Preinsulated bonded pipe systems for directly buried hot water networks Steel valve assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene; EN 489, District heating pipes Preinsulated bonded pipe systems for directly buried
37、hot water networks Joint assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene; EN 13941, Design and installation of preinsulated bonded pipe systems for district heating; EN 14419, District heating pipes Preinsulated bonded pipe systems for directly buri
38、ed hot water networks Surveillance systems; EN 15698-1, District heating pipes Preinsulated bonded twin pipe systems for directly buried hot water networks Part 1: Twin pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene BS EN 253:2009+A2:2015EN 253:
39、2009+A2:2015 (E) 7 1 Scope This European Standard specifies requirements and test methods for straight lengths of prefabricated thermally insulated pipe-in-pipe assemblies for directly buried hot water networks, comprising a steel service pipe from DN 15 to DN 1200, rigid polyurethane foam insulatio
40、n and an outer casing of polyethylene. The pipe assembly may also include the following additional elements: measuring wires, spacers and diffusion barriers. This standard applies only to insulated pipe assemblies, for continuous operation with hot water at various temperatures up to 120 C and occas
41、ionally with a peak temperature up to 140 C. The estimation of expected thermal life with continuous operation at various temperatures is outlined in Annex B. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only
42、the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 489, District heating pipes Preinsulated bonded pipe systems for directly buried hot water networks Joint assembly for steel service pipes, polyurethane thermal ins
43、ulation and outer casing of polyethylene EN 728, Plastics piping and ducting systems Polyolefin pipes and fittings Determination of oxidation induction time EN 10204, Metallic products Types of inspection documents EN 10216-2, Seamless steel tubes for pressure purposes Technical delivery conditions
44、Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties EN 10217-1, Welded steel tubes for pressure purposes Technical delivery conditions - Part 1: Non-alloy steel tubes with specified room temperature properties EN 10217-2, Welded steel tubes for pressure purposes Te
45、chnical delivery conditions Part 2: Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties EN 10217-5, Welded steel tubes for pressure purposes Technical delivery conditions Part 5: Submerged arc welded non-alloy and alloy steel tubes with specified elevated t
46、emperature properties EN 10220, Seamless and welded steel tubes Dimensions and masses per unit length EN 13941, Design and installation of preinsulated bonded pipe systems for district heating EN 14419, District heating pipes Preinsulated bonded pipe systems for directly buried hot water networks Su
47、rveillance systems EN ISO 1133:2005, Plastics Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of thermoplastics (ISO 1133:2005) EN ISO 2505, Thermoplastics pipes Longitudinal reversion Test methods and parameters (ISO 2505:2005) EN ISO 3126, Plastics piping systems
48、 Plastics components Determination of dimensions (ISO 3126:2005) BS EN 253:2009+A2:2015EN 253:2009+A2:2015 (E) 8 EN ISO 8497:1996, Thermal insulation Determination of steady-state thermal transmission properties of thermal insulation for circular pipes (ISO 8497:1994) EN ISO 8501-1:2007, Preparation
49、 of steel substrates before application of paints and related products Visual assessment of surface cleanliness Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings (ISO 8501-1:2007) EN ISO 9080, Plastics piping and ducting systems Determination of the long-term hydrostatic strength of thermoplastic materials in pipe form by extrapolation (ISO 9080:2003) EN ISO 9692-1, Welding and allied processes
