1、BS EN 448:2009ICS 23.040.40NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDDistrict heating pipes Preinsulated bondedpipe systems fordirectly buried hotwater networks Fitting assemblies ofsteel service pipes,polyurethane thermalinsulation and outercasing of poly
2、ethyleneCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-This British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 31 March2009 BSI 200
3、9ISBN 978 0 580 58891 4Amendments/corrigenda issued since publicationDate CommentsBS EN 448:2009National forewordThis British Standard is the UK implementation of EN 448:2009. Itsupersedes BS EN 448:2003 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee R
4、HE/9, Insulated underground pipelines.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British S
5、tandard cannot confer immunityfrom legal obligations.Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 448:2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 448February 2
6、009ICS 23.040.40 Supersedes EN 448:2003 English VersionDistrict heating pipes - Preinsulated bonded pipe systems fordirectly buried hot water networks - Fitting assemblies of steelservice pipes, polyurethane thermal insulation and outer casingof polyethyleneTuyaux de chauffage urbain - Systmes bloqu
7、s de tuyauxprisols pour des rseaux deau chaude enterrsdirectement - Raccords prisols pour tubes de service enacier, isolation thermique en polyurthane et tube deprotection en polythylneFernwrmerohre - Werkmig gedmmteVerbundmantelrohrsysteme fr direkt erdverlegteFernwrmenetze - Verbundformstcke, best
8、ehend ausStahl-Mediumrohr, Polyurethan-Wrmedmmung undAuenmantel aus PolyethylenThis European Standard was approved by CEN on 3 January 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a nation
9、al standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any
10、other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia
11、, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES
12、KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 448:2009: ECopyright European Committee for Standardization Provided by IHS under license with CENNot for Res
13、aleNo reproduction or networking permitted without license from IHS-,-,-BS EN 448:2009EN 448:2009 (E) 2 Contents Foreword 4 1 Scope 6 2 Normative references 6 3 Terms and definitions . 7 4 Requirements . 9 4.1 Steel parts . 9 4.1.1 Quality . 9 4.1.2 Wall thickness and diameter 9 4.1.3 Bends 10 4.1.4
14、 T-pieces 11 4.1.5 Reducers . 11 4.1.6 Anchors 11 4.1.7 Single use compensators . 11 4.1.8 Dish or end caps 11 4.1.9 Fusion welding of steel fittings 11 4.1.10 Surface condition. 15 4.2 Casing . 15 4.3 Polyurethane rigid foam insulation (PUR) 15 4.4 Fitting assemblies 15 4.4.1 Fitting ends . 15 4.4.
15、2 Angle between casing segments of bend and minimum length . 16 4.4.3 Requirements of polyethylene welding . 16 4.4.4 Leak-tightness of the welded casing pipe 18 4.4.5 Diameter and wall thickness of the casing . 19 4.4.6 Minimum insulation thickness in bends . 19 4.4.7 Tolerances of the main fitting
16、 dimensions . 19 4.5 Surveillance system 19 5 Test methods 20 5.1 General 20 5.2 Test specimens 20 5.3 Steel parts . 20 5.3.1 Visual surface examination of welds . 20 5.3.2 Leak-tightness test with water . 20 5.3.3 Leak-tightness test with air 20 5.3.4 Non-destructive examination of welds 20 5.3.5 N
17、DT of welds 21 5.4 Casing . 21 5.5 Polyurethane rigid foam insulation (PUR) 21 5.6 Fitting assemblies 21 5.6.1 Centre line deviation and angular deviation . 21 5.6.2 Visual examination of welds on casing pipes 21 5.6.3 Bending test . 21 5.6.4 Minimum insulation thickness . 22 5.7 Surveillance system
18、 23 6 Marking . 23 6.1 General 23 6.2 Steel service pipe. 23 6.3 Casing . 23 6.4 Fitting assembly. 23 6.5 Single use compensators . 23 Annex A (informative) Guidelines for inspection and testing. 25 A.1 General 25 A.2 Manufacturers type test . 25 A.3 Manufacturers quality control . 25 A.4 External i
19、nspection 25 A.5 Extent of inspection. 25 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 448:2009EN 448:2009 (E) 3 A.6 Manufacturers responsibility 25 Annex B (informative
20、) Procedures for polyethylene welding . 28 B.1 General 28 B.2 Recommendations for site, machine and equipment 28 B.3 Items 28 B.4 Butt fusion welding . 28 B.4.1 Equipment 28 B.4.2 Welding procedure 29 B.5 Extrusion welding 30 B.5.1 Equipment 30 B.5.2 Welding procedure 31 Annex C (informative) Main c
21、hanges from EN 448:2003 . 32 Bibliography 34 Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 448:2009EN 448:2009 (E) 4 Foreword This document (EN 448:2009) has been prepare
22、d 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 publication of an identical text or by endorsement, at the latest by August 2009, and conflict
23、ing national standards shall be withdrawn at the latest by August 2009. 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
24、supersedes EN 448:2003. The main changes from EN 448:2003 have been listed in the informative Annex C. 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, Cyprus,
25、 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, Switzerland and the United Kingdom. Copyright European Committee for Standar
26、dization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 448:2009EN 448:2009 (E) 5 Introduction The first edition of EN 448 was approved in 1994. A completely revised standard was published in 2003. The main areas of the
27、current revision have been listed in Annex C. The main reason for drafting the EN 448:2009 is the aligning with EN 13941 and with other relevant recent European standards. For information on the minimum expected thermal life with operation at various temperatures with respect to PUR foam performance
28、 see EN 253:2009, Annex B. The other standards from TC 107 are: EN 253, 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; EN 488, District heating pipes
29、 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 hot water networks Joint assemb
30、ly 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 buried hot water networks Surveilla
31、nce systems; EN 15632 (all parts), District heating pipes Pre-insulated flexible pipe 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 c
32、asing of polyethylene. Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 448:2009EN 448:2009 (E) 6 1 Scope This European Standard specifies requirements and test methods for
33、fittings of prefabricated thermally insulated pipe-in-pipe assemblies comprising a steel service fitting from DN 20 to DN 1200, rigid polyurethane foam insulation and an outer casing of polyethylene for use in directly buried hot water networks with preinsulated pipe assemblies in accordance with EN
34、 253. This European Standard covers the following fittings: bends, T-pieces, reducers, single use compensators and anchors. This European Standard applies only to insulated fitting assemblies and single use compensators for continuous operation with hot water at various temperatures in accordance wi
35、th EN 253:2009, Clause 1. This European Standard applies to fitting assemblies with a minimum design pressure of 16 bar (overpressure) complying with EN 13941. Guidelines for quality inspection are given in Annex A of this European Standard. Procedures for PE-welding are given in Annex B of this Eur
36、opean Standard. NOTE This European Standard does not include rules for calculation of loads and stresses. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, th
37、e latest edition of the referenced document (including any amendments) applies. EN 253:2009, 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 EN 287
38、-1, Qualification test of welders - Fusion welding Part 1: Steels EN 489:2009, District heating pipes Preinsulated bonded pipe systems for directly buried hot water networks Joint assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene EN 571-1, Non destruc
39、tive testing Penetrant testing Part 1: General principles EN 1289, Non-destructive examination of welds - Penetrant testing of welds Acceptance levels EN 1290, Non-destructive examination of welds Magnetic particle examination of welds EN 1291, Non-destructive examination of welds Magnetic particle
40、testing of welds Acceptance levels EN 1418, Welding personnel Approval testing of welding operators for fusion welding and resistance weld setters for fully mechanized and automatic welding of metallic materials EN 1435, Non-destructive examination of welds Radiographic examination of welded joints
41、EN 10253-2:2007 Butt-welding pipe fittings Part 2: Non alloy and ferritic alloy steels with specific inspection requirements EN 12517-1, Non-destructive testing of welds Part 1: Evaluation of welded joints in steel, nickel, titanium and their alloys by radiography Acceptance levels EN 12814-1, Testi
42、ng of welded joints of thermoplastics semi-finished products Part 1: Bend test EN 13941, Design and installation of preinsulated bonded pipe systems for district heating Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking
43、 permitted without license from IHS-,-,-BS EN 448:2009EN 448:2009 (E) 7 EN 14419:2009, District heating pipes Preinsulated bonded pipe systems for directly buried hot water networks Surveillance systems EN 14870-1, Petroleum and natural gas industries - Induction bends, fittings and flanges for pipe
44、line transportation systems Part 1: Induction bends (ISO 15590-1:2001 modified) EN ISO 5817, Welding Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) Quality levels for imperfections (ISO 5817:2003, corrected version:2005, including Technical Corrigendum 1:200
45、6) EN ISO 8501-1, Preparation 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
46、 ISO 9692-1:2003, Welding and allied processes - Recommendations for joint preparation - Part 1: Manual metal-arc welding, gas-shielded metal-arc welding, gas welding, TIG welding and beam welding of steels (ISO 9692-1:2003) EN ISO 15607, Specification and qualification of welding procedures for met
47、allic materials General rules (ISO 15607:2003) ISO 17636, Non-destructive testing of welds - Radiographic testing of fusion-welded joints 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 253:2009 and the following apply. 3.1 anchor steel construction u
48、sed to transfer the axial load from the steel service pipe through the insulation and the casing to a fixed point 3.2 bending angle deviation in direction of the steel pipe centre lines 3.3 butt welded bend bend manufactured either by hot bending of steel pipe or by hot forming of steel plates which are subsequently welded together 3.4 cold formed bend bend manufactured by cold bending of steel pipe 3.5 dish or end cap not pre-insulated butt welded fitting to be welded on the end of a pipe or pipe element 3.6 fitting pipe element 3.7 forged T-piece T-
