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1、BRITISH STANDARD BS EN 253:2003 Incorporating Amendment No. 1 District heating pipes Preinsulated bonded pipe systems for directly buried hot water networks Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene The European Standard EN 253:2003, with t
2、he incorporation of amendment A1:2005, has the status of a British Standard ICS 23.040.99 ? BS EN 253:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 27 February 2003 BSI 16 March 2006 ISBN 0 580 41319 5 National foreword This British St
3、andard is the official English language version of EN 253:2003 including amendment A1:2005. It supersedes BS EN 253:1995 which is withdrawn. The start and finish of text introduced or altered by CEN amendment is indicated in the text by tags ?. Tags indicating changes to CEN text carry the number of
4、 the CEN amendment. For example, text altered by CEN amendment A1 is indicated by ?. The UK participation in its preparation was entrusted by Technical Committee RHE/9, Thermal insulating materials, to Subcommittee RHE/9/3, Insulation of underground pipelines, which has the responsibility to: A list
5、 of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “ International Stan
6、dards Correspondence Index” , or by using the “ Search” facility of the BSI Electronic Catalogue or of British Standards Online. 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 Stand
7、ard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European de
8、velopments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 51 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publicati
9、on Amd. No. DateComments 16014March 2006See national foreword EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 253 November 2005 ICS 23.040.99 Supersedes EN 253:2003 +A1 English version District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assemb
10、ly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene Tuyaux de chauffage urbain - Systmes bloqus de tuyaux pr-isols pour les rseaux deau chaude enterrs directement - Tube de service en acier, isolation thermique en polyurthane et tube de protection en polythylne
11、 Fernwrmerohre - Werkmig gedmmte 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 28 November 2002. Amendment A1 was approved by CEN on
12、 7 October 2005. 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
13、 be obtained on application to the 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 Manage
14、ment Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden,
15、Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2003 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Re
16、f. No. EN 253:2003 + A1: 2005 E February 2003 (includes amendment A1:2005) (inclut lamendement A1:2005) (enthlt nderung A1:2005) EN 253:2003 (E) 2 Contents page Foreword5 Introduction.6 1Scope 8 2Normative references 8 3Terms and definitions9 4Requirements.10 4.1General10 4.2Steel service pipe.11 4.
17、2.1Quality.11 4.2.2Diameter11 4.2.3Wall thickness11 4.2.4Surface condition.13 4.3Casing.13 4.3.1Material properties.13 4.3.2Casing properties 14 4.4Polyurethane rigid foam insulation (PUR).16 4.4.1Composition.16 4.4.2Cell structure17 4.4.3Foam density17 4.4.4Compressive strength.17 4.4.5Water absorp
18、tion at elevated temperature17 4.5Pipe assembly17 4.5.1Pipe ends17 4.5.2Increase in diameter of the casing pipe 17 4.5.3Centre line deviation18 4.5.4Expected thermal life and long term temperature resistance.19 4.5.5Thermal conductivity in unaged condition .19 4.5.6Impact resistance.19 4.5.7Creep be
19、haviour.19 4.5.8Surface conditions at delivery20 5Test methods20 5.1General20 5.1.1Test specimens20 5.2Casing.20 5.2.1Material density20 5.2.2Dimensions.20 5.2.3Appearance and surface finish.21 5.2.4Heat reversion21 5.2.5Long-term mechanical properties21 5.2.6Constant load tensile test (CLT).21 5.2.
20、7Elongation at break21 5.2.8Carbon black dispersion, homogeneity 22 5.2.9Notched constant load test.22 5.3Polyurethane rigid foam insulation (PUR).23 5.3.1Composition.23 5.3.2Cell structure23 5.3.3Foam density23 5.3.4Compressive strength.24 5.3.5Water absorption .24 ? EN 253:2003 (E) 3 5.4Pipe assem
21、bly24 5.4.2Axial shear strength 24 5.4.3Tangential shear strength.26 5.4.4Shear strength of the pipe assembly after ageing.27 5.4.5Thermal conductivity.27 5.4.6Impact resistance.28 5.4.7Creep behaviour at 140 C28 6Marking.31 6.1General31 6.2Steel service pipe.31 6.3Casing.31 6.4Pipe assembly31 Annex
22、 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 various temperatures with respect to PUR foam performance 34 Annex C (normative) Calculated cont
23、inuous operating temperature (CCOT).35 C.1General35 C.2Symbols35 C.3Ageing and shear strength determinations 35 C.4Calculations36 C.4.1Determination of the thermal life at different ageing temperatures.36 C.4.2Adoption to the Arrhenius relation36 C.4.3Calculated continuous operating temperature, CCO
24、T.36 Annex D (informative) Guidelines for inspection and testing38 D.1Manufacturers type test .38 D.2Manufacturers quality surveillance.38 D.3External inspection38 D.4Manufacturers responsibility.38 Annex E (informative) Change of blowing agent and influence on thermochemical and thermomechanical pr
25、operties of polyurethane rigid foam (PUR).41 Annex F (normative) Radial creep behaviour of the polyurethane foam (PUR) 42 Annex G (normative) Thermal conductivity of pre-insulated pipes - Test procedure 44 G.1Scope 44 G.2Requirements (EN ISO 8497:1994, Clause 5).44 G.2.1Test specimen (EN ISO 8497:19
26、94, 5.1).44 G.2.2Operating temperature (EN ISO 8497:1994, 5.2).44 G.2.3Types of apparatus (EN ISO 8497:1994, 5.5).44 G.3Apparatus (EN ISO 8497:1994, Clause 7).44 G.3.1Guarded end apparatus.44 G.3.2Calibrated end apparatus45 G.3.3Dimensions (EN ISO 8497:1994, 7.2)45 G.3.4Heater pipe surface temperatu
27、re45 G.4Test specimens (EN ISO 8497:1994, Clause 8)45 G.4.1Conditioning (EN ISO 8497:1994, 8.4)45 G.4.2Dimension measurement (EN ISO 8497:1994, 8.5).45 G.4.3Surface temperature measurement .45 G.5Procedure (EN ISO 8497:1994, Clause 9).45 G.5.1Test length (EN ISO 8497:1994, 9.1.1)45 G.5.2Diameter (EN
28、 ISO 8497:1994, 8.5).46 G.5.3Thickness of casing.46 G.5.4Ambient requirements (EN ISO 8497:1994, 9.2)46 G.5.5Test pipe temperature (EN ISO 8497:1994, 9.3)46 G.5.6Power supply (EN ISO 8497:1994, 7.9).46 G.5.7Axial heat loss (EN ISO 8497:1994, 5.7).46 ? EN 253:2003 (E) 4 G.5.8Test period and stability
29、 (EN ISO 8497:1994, 9.5.3)46 G.6Calculations (EN ISO 8497:1994, Clause 11)46 G.6.1Thermal conductivity (EN ISO 8497:1994, 3.5)46 G.7Symbols and units (EN ISO 8497:1994 Clause 4)47 Annex H (informative) National A-deviations .49 H.1 Swedish national legislative deviations on steel service pipes49 Bib
30、liography51 ? EN 253:2003 (E) 5 Foreword This document (EN 253:2003) 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 publicati
31、on of an identical text or by endorsement, at the latest by August 2003, and conflicting national standards shall be withdrawn at the latest by August 2003. This document supersedes EN 253:1994. Annexes A, B, D, E and H are informative. Annexes C, F and G are normative. This document includes a Bibl
32、iography. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, N
33、etherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. Foreword to amendment A1 This European Standard (EN 253:2003/A1:2005) has been prepared by Technical Committee CEN/TC 107 “ Prefabricated District Heating pipe Systems” , the secretariat of which is held by DS
34、. This Amendment to the European Standard EN 253:2003 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2006, and conflicting national standards shall be withdrawn at the latest by May 2006. According to the CEN/CENEL
35、EC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta
36、, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. ? EN 253:2003 (E) 6 Introduction The first edition of EN 253 was approved in 1990. The first edition was replaced by the second edition in 1994. The main areas of the first revision were: the
37、requirements for the PE quality have been updated; any reference to CFC has been deleted and alternative blowing agents have been taken into consideration. For further information see annex E. The main areas of this second revision are: the title has been amended by ”District heating pipes”; the ter
38、m ”underground” in the title has been changed to ”directly buried”; the mentioning in the foreword of the production method ”injected (poured)” has been deleted; the references to other standards have been changed to be in line with the latest versions of the standards; definitions have been added f
39、or terms ”batch”, ”calculated continuous operating temperature (CCOT)”, ”creep”, “foam density”, “lot“ and ”thermal life”; the definitions for the terms “overall density“, “core density“, “density of PE-raw material“, “high density polyethylene (PE-HD)“, “injected (poured) pipe assembly“, “melt flow
40、 rate, MFR 190/5“ have been deleted; the term “casing pipe“ has been changed to “casing“ to allow the use of PE casing continously extruded directly onto the insulation and the requirements and tests have been amended accordingly; the requirements for the steel quality and dimensions of the steel se
41、rvice pipe have been changed as much as possible to be in line with European Standards. This includes references to the new European Standards EN 10216-2, EN 10217-2 and EN 10217-5; requirements on tolerances on the outside diameter, Ds, of the steel service pipe at the pipe ends have been introduce
42、d; requirements on tolerances on the actual wall thickness, T, of the steel service pipe have been introduced; service pipes with nominal diameters from DN 700 up to and including DN 1200 have been added and the requirements have been amended accordingly; requirements on 3.1.B certificates for the s
43、teel service pipe have been included; requirements and test methods for the dispersion of carbon black in the casing material have been introduced; the reference temperature for testing the induction time of the casing has been changed to 210 C; casings with nominal outside diameters from 900 mm up
44、to and including 1 400 mm have been added and the requirements have been amended accordingly; the requirement on the minimum time to failure of the casing when tested for long-term mechanical properties have been extended to 2 000 h; ? EN 253:2003 (E) 7 the requirements for the cell structure of the
45、 PUR foam insulation have been extended and a test method has been introduced; the requirements for “core density“ and “overall density“ have been deleted and substituted by requirements for “foam density“ and the method for testing the “overall density“ has been omitted; the “calculated continuous
46、operating temperature (CCOT)“ has been introduced. This includes the addition of the normative annex C; the requirements for “creep resistance“ have been substituted by requirements for “creep behaviour“ and a test method for creep behaviour at 140 C has been introduced. This includes the addition o
47、f the normative annex F; requirements on “stress crack resistance“ and a “notched constant load test“ for the casing have been added; requirements for surface conditions at delivery have been added; requirements on marking of steel service pipes have been added; the former annexes C, D and E have be
48、en redesignated D, E and H respectively; a new test procedure for testing of thermal conductivity of preinsulated pipes has been introduced and included as annex G. The relevant requirements have been included in 4.5.5 and 5.4.5. This specification is part of the standards for bonded systems using p
49、olyurethane foam thermal insulation applied to bond to a steel service pipe and a polyethylene casing. The other standards from CEN/TC 107 are: EN 448:2003, 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