1、February 2016 English price group 15No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 23.040.40!%LFa“2413562www.din.d
2、eDIN EN 448District 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;English version EN 448:2015,English translation of DIN EN 448:2016-02Fernwrmerohre Wer
3、kmig gedmmte Verbundmantelrohrsysteme fr direkt erdverlegte Fernwrmenetze Verbundformstcke, bestehend aus Stahl-Mediumrohr, Polyurethan-Wrmedmmung und Auenmantel aus Polyethylen;Englische Fassung EN 448:2015,Englische bersetzung von DIN EN 448:2016-02Tuyaux de chauffage urbain Systmes bloqus de tuya
4、ux prisols pour des rseaux deau chaude enterrs directement Raccords prisols pour tubes de service en acier, isolation thermique en polyurthane et tube de protection en polythylne;Version anglaise EN 448:2015,Traduction anglaise de DIN EN 448:2016-02SupersedesDIN EN 448:2009-07www.beuth.deDTranslatio
5、n by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.Document comprises 32 pages 01.16 DIN EN 448:2016-02 2 A comma is used as the decimal marker. National foreword This document (EN 448:2015) has been prepared by Technical Committee CEN/TC 107 “Pr
6、efabricated district heating and district cooling pipe systems” (Secretariat: DS, Denmark). The responsible German body involved in its preparation was DIN-Normenausschuss Heiz- und Raumlufttechnik (DIN Standards Committee Heating and Ventilation Technology), Working Committee NA 041-01-12 AA Werksm
7、ig gedmmte Mantelrohre fr Fernwrme (SpA CEN/TC 107). The DIN Standard corresponding to the International Standard referred to in this document is as follows: ISO 2859-2 DIN ISO 2859-2 Amendments This standard differs from DIN EN 448:2009-07 as follows: a) the standard has been harmonized with EN 488
8、; b) in Clause 4, certification of the material of steel parts in accordance with EN 10204 has been specified; c) the standard has been editorially revised. Previous editions DIN EN 448: 1994-12, 2003-05, 2009-07 National Annex NA (informative) Bibliography DIN ISO 2859-2, Sampling procedures for in
9、spection by attributes Part 2: Sampling plans indexed by limiting quality (LQ) for isolated lot inspection EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 448 November 2015 ICS 23.040.40 Supersedes EN 448:2009English Version District heating pipes - Preinsulated bonded pipe systems for directly
10、 buried hot water networks - Fitting assemblies of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene Tuyaux de chauffage urbain - Systmes bloqus de tuyaux prisols pour des rseaux deau chaude enterrs directement - Raccords prisols pour tubes de service en acier, is
11、olation thermique en polyurthane et tube de protection en polythylne Fernwrmerohre - Werkmig gedmmte Verbundmantelrohrsysteme fr direkt erdverlegte Fernwrmenetze - Verbundformstcke, bestehend aus Stahl-Mediumrohr, Polyurethan-Wrmedmmung und Auenmantel aus Polyethylen This European Standard was appro
12、ved by CEN on 5 September 2015. 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 nationa
13、l 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
14、 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, Hu
15、ngary, 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 COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CE
16、NELEC Management Centre: Avenue Marnix 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 448:2015 EEN 448:2015 (E) 2Contents Page European foreword . 4 Introduction 5 1 Scope 6 2 Normative references 6 3 Term
17、s and definitions . 8 4 Requirements 10 4.1 Steel parts . 10 4.1.1 General . 10 4.1.2 Quality 10 4.1.3 Wall thickness and diameter . 10 4.1.4 Bends 10 4.1.5 T-pieces 11 4.1.6 Reducers 12 4.1.7 Anchors 12 4.1.8 Single use compensators . 12 4.1.9 Caps . 12 4.1.10 Fusion welding of steel fittings . 12
18、4.1.11 Surface condition . 14 4.2 Casing . 15 4.3 Polyurethane rigid foam insulation (PUR) . 15 4.4 Fitting assemblies 15 4.4.1 Fitting ends . 15 4.4.2 Angle between casing segments of bend and minimum length . 15 4.4.3 Requirements of polyethylene welding . 16 4.4.4 Leak-tightness of the welded cas
19、ing pipe 17 4.4.5 Diameter and wall thickness of the casing 18 4.4.6 Minimum insulation thickness in bends 18 4.4.7 Tolerances of the main fitting dimensions . 18 4.5 Surveillance system . 18 5 Test methods . 18 5.1 General . 18 5.2 Test specimens 19 5.3 Steel parts . 19 5.3.1 Visual surface examina
20、tion of welds . 19 5.3.2 Leak-tightness test with water 19 5.3.3 Leak-tightness test with air 19 5.3.4 Non-destructive examination of welds 19 5.3.5 NDT of welds 20 5.4 Casing . 20 5.5 Polyurethane rigid foam insulation (PUR) . 20 5.6 Fitting assemblies 20 5.6.1 Centre line deviation and angular dev
21、iation 20 5.6.2 Visual examination of welds on casing pipes . 20 5.6.3 Bending test . 20 5.6.4 Minimum insulation thickness 21 5.7 Surveillance system . 21 DINEN 448:2016-02EN 448:2015(E)3 6 Marking 21 6.1 General . 21 6.2 Steel service pipe 21 6.3 Casing 22 6.4 Fitting assembly 22 6.5 Single use co
22、mpensators 22 Annex A (informative) Guidelines for inspection and testing . 23 A.1 General . 23 A.2 Manufacturers type test 23 A.3 Manufacturers quality control 23 A.4 External inspection 23 A.5 Extent of inspection . 23 A.6 Manufacturers responsibility . 23 Annex B (informative) Procedures for poly
23、ethylene welding . 26 B.1 General . 26 B.2 Recommendations for site, machine and equipment 26 B.3 Items 26 B.4 Butt fusion welding 26 B.5 Extrusion welding . 28 Bibliography . 30 DIN EN 448:2016-02 EN 448:2015 (E) 4 European foreword This document (EN 448:2015) has been prepared by Technical Committ
24、ee CEN/TC 107 “Prefabricated district heating and district cooling pipe system”, 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 May 2016, and conflicting n
25、ational standards shall be withdrawn at the latest by May 2016. 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 supersed
26、es EN 448:2009. 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 Macedo
27、nia, 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. DIN EN 448:2016-02 EN 448:2015 (E) 5 Introduction EN 448 has been align
28、ed with EN 488 and other relevant European Standards. Other standards from CEN/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
29、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 hot
30、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 buried h
31、ot water networks Surveillance 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 the
32、rmal insulation and outer casing of polyethylene; EN 15698-2, 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. DIN EN 448:2016-02 EN 448:2015 (E)
33、 61 Scope This European Standard specifies requirements and test methods for 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 buri
34、ed hot water networks with preinsulated pipe assemblies in accordance with EN 253. This European Standard covers the following fittings: bend, tee, reducer, single use compensator and anchor. This European Standard applies only to factory made prefabricated fitting assemblies and single use compensa
35、tors for continuous operation with hot water at various temperatures in accordance with EN 253. This European Standard applies to fitting assemblies with a minimum design pressure of 16 bar (overpressure) complying with EN 13941. This European Standard does not include calculation rules for loads an
36、d stresses. The design and installation rules, for the system, are given in EN 13941. 2 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
37、undated references, the latest edition of the referenced document (including any amendments) applies. EN 253:2009+A2:2015, District heating pipes Preinsulated bonded pipe systems for directly buried hot water networks Pipe assembly of steel service pipe, polyurethane thermal insulation and outer cas
38、ing of polyethylene 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 10216-2, Seamless steel tubes for pressure purposes Technical de
39、livery conditions 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 pres
40、sure purposes Technical 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 spec
41、ified elevated temperature properties EN 10253-2, Butt-welding pipe fittings Part 2: Non alloy and ferritic alloy steels with specific inspection requirements EN 12814-1, Testing of welded joints of thermoplastics semi-finished products Part 1: Bend test EN 13018, Non-destructive testing Visual test
42、ing General principles EN 13941, Design and installation of preinsulated bonded pipe systems for district heating 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 Induct
43、ion bends, fittings and flanges for pipeline transportation systems Part 1: Induction bends (ISO 15590-1:2009 modified) DINEN 448:2016-02EN 448:2015 (E) 7 EN ISO 3452-1, Non-destructive testing Penetrant testing Part 1: General principles (ISO 3452-1) EN ISO 5579, Non-destructive testing Radiographi
44、c testing of metallic materials using film and X- or gamma rays Basic rules (ISO 5579) EN ISO 5817, Welding Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) Quality levels for imperfections (ISO 5817) EN ISO 8501-1, Preparation of steel substrates before appli
45、cation 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) EN ISO 9606-1, Qualification testing of welders Fusion welding Part 1
46、: Steels (ISO 9606-1) EN ISO 9692-1:2013, Welding and allied processes Types of joint preparation Part 1: Manual metal arc welding, gas-shielded metal arc welding, gas welding, TIG welding and beam welding of steels (ISO 9692-1:2013) EN ISO 9934-1, Non-destructive testing Magnetic particle testing P
47、art 1: General principles (ISO 9934-1) EN ISO 10675-1, Non-destructive testing of welds Acceptance levels for radiographic testing Part 1: Steel, nickel, titanium and their alloys (ISO 10675-1) EN ISO 11666, Non-destructive testing of welds Ultrasonic testing Acceptance levels (ISO 11666) EN ISO 147
48、32, Welding personnel Qualification testing of welding operators and weld setters for mechanized and automatic welding of metallic materials (ISO 14732) EN ISO 15607, Specification and qualification of welding procedures for metallic materials General rules (ISO 15607) EN ISO 16810, Non-destructive
49、testing Ultrasonic testing General principles (ISO 16810) EN ISO 17636-1, Non-destructive testing of welds Radiographic testing Part 1: X- and gamma-ray techniques with film (ISO 17636-1) EN ISO 17636-2, Non-destructive testing of welds Radiographic testing Part 2: X- and gamma-ray techniques with digital detect
