1、BSI Standards PublicationBS EN 448:2015District 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 polyethyleneBS EN 448:2015 BRITISH STANDARDNational forewordThis Britis
2、h Standard is the UK implementation of EN 448:2015. It supersedes BS EN 448:2009 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee RHE/9, Insulated underground pipelines.A list of organizations represented on this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
3、its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 85227 5 ICS 23.040.40 Compliance with a British Stand
4、ard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 448:2015EUROPEAN STANDARD NORME EUROPENNE EUROP
5、ISCHE NORM EN 448 November 2015 ICS 23.040.40 Supersedes EN 448:2009English Version 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 Tuyaux de
6、 chauffage urbain - Systmes bloqus de tuyaux 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 Fernwrmerohre - Werkmig gedmmte Verbundmantelrohrsysteme fr direkt erdverlegt
7、e Fernwrmenetze - Verbundformstcke, bestehend aus Stahl-Mediumrohr, Polyurethan-Wrmedmmung und Auenmantel aus Polyethylen This European Standard was approved by CEN on 5 September 2015. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for givin
8、g 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-CENELEC Management Centre or to any CEN member. This European Standard exists in three offic
9、ial 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of
10、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, Portugal, Romania, Slovakia, Slovenia, Spain, S
11、weden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for
12、 CEN national Members. Ref. No. EN 448:2015 EBS EN 448:2015EN 448:2015 (E) 2 Contents Page European foreword . 4 Introduction 5 1 Scope 6 2 Normative references 6 3 Terms 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
13、. 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 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 Fit
14、ting 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 casing 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 t
15、he 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 examination 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
16、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 deviation 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
17、Surveillance system . 21 BS EN 448:2015EN 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 compensators 22 Annex A (informative) Guidelines for inspection and testing . 23 A.1 General . 23 A.2 Manufacturers type test 23 A.3 M
18、anufacturers quality control 23 A.4 External inspection 23 A.5 Extent of inspection . 23 A.6 Manufacturers responsibility . 23 Annex B (informative) Procedures for polyethylene welding . 26 B.1 General . 26 B.2 Recommendations for site, machine and equipment 26 B.3 Items 26 B.4 Butt fusion welding 2
19、6 B.5 Extrusion welding . 28 Bibliography . 30 BS EN 448:2015EN 448:2015 (E) 4 European foreword This document (EN 448:2015) has been prepared by Technical Committee CEN/TC 107 “Prefabricated district heating and district cooling pipe system”, the secretariat of which is held by DS. This European St
20、andard 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 national standards shall be withdrawn at the latest by May 2016. Attention is drawn to the possibility that some of the elements of this d
21、ocument 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 supersedes EN 448:2009. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bo
22、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
23、al, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 448:2015EN 448:2015 (E) 5 Introduction EN 448 has been aligned with EN 488 and other relevant European Standards. Other standards from CEN/TC 107 are: EN 253, District heating pipes Preinsulated bonded
24、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 Preinsulated bonded pipe systems for directly buried hot water networks Steel valve assembly for steel service pip
25、es, polyurethane thermal insulation and outer casing of polyethylene; EN 489, 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 13941, Design and
26、installation of preinsulated bonded pipe systems for district heating; EN 14419, District heating pipes Preinsulated bonded pipe systems for directly buried hot water networks Surveillance systems; EN 15632 (all parts), District heating pipes Pre-insulated flexible pipe systems; EN 15698-1, District
27、 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; EN 15698-2, District heating pipes Preinsulated bonded pipe systems for directly buried hot
28、water networks Fitting assemblies of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene. BS EN 448:2015EN 448:2015 (E) 6 1 Scope This European Standard specifies requirements and test methods for fittings of prefabricated thermally insulated pipe-in-pipe assemblies
29、 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 253. This European Standard covers the following fittings: bend, tee
30、, reducer, single use compensator and anchor. This European Standard applies only to factory made prefabricated fitting assemblies and single use compensators for continuous operation with hot water at various temperatures in accordance with EN 253. This European Standard applies to fitting assembli
31、es with a minimum design pressure of 16 bar (overpressure) complying with EN 13941. This European Standard does not include calculation rules for loads and stresses. The design and installation rules, for the system, are given in EN 13941. 2 Normative references The following documents, in whole or
32、in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 253:2009+A2:2015, District heating pipes
33、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 489:2009, District heating pipes Preinsulated bonded pipe systems for directly buried hot water networks Joint assembly for
34、 steel service pipes, polyurethane thermal insulation and outer casing of polyethylene EN 10216-2, Seamless steel tubes for pressure purposes Technical delivery conditions Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties EN 10217-1, Welded steel tubes for pressu
35、re purposes Technical delivery conditions Part 1: Non-alloy steel tubes with specified room temperature properties EN 10217-2, Welded steel tubes for pressure purposes Technical delivery conditions Part 2: Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties
36、 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 temperature properties EN 10253-2, Butt-welding pipe fittings Part 2: Non alloy and ferritic alloy steels with specific inspection
37、requirements EN 12814-1, Testing of welded joints of thermoplastics semi-finished products Part 1: Bend test EN 13018, Non-destructive testing Visual testing General principles EN 13941, Design and installation of preinsulated bonded pipe systems for district heating EN 14419:2009, District heating
38、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 pipeline transportation systems Part 1: Induction bends (ISO 15590-1:2009 modified) BS EN 448:2015EN 448:2015
39、(E) 7 EN ISO 3452-1, Non-destructive testing Penetrant testing Part 1: General principles (ISO 3452-1) EN ISO 5579, Non-destructive testing Radiographic 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, ti
40、tanium and their alloys (beam welding excluded) Quality levels for imperfections (ISO 5817) 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 substrate
41、s 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: 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 meta
42、l 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 Part 1: General principles (ISO 9934-1) EN ISO 10675-1, Non-destructive testing of welds Acceptance levels for radiographic testing Part 1: Steel, nic
43、kel, titanium and their alloys (ISO 10675-1) EN ISO 11666, Non-destructive testing of welds Ultrasonic testing Acceptance levels (ISO 11666) EN ISO 14732, Welding personnel Qualification testing of welding operators and weld setters for mechanized and automatic welding of metallic materials (ISO 147
44、32) EN ISO 15607, Specification and qualification of welding procedures for metallic materials General rules (ISO 15607) EN ISO 16810, Non-destructive testing Ultrasonic testing General principles (ISO 16810) EN ISO 17636-1, Non-destructive testing of welds Radiographic testing Part 1: X- and gamma-
45、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 detectors (ISO 17636-2) EN ISO 17637, Non-destructive testing of welds Visual testing of fusion-welded joints (ISO 17637) EN ISO 17638, Non-de
46、structive testing of welds Magnetic particle testing (ISO 17638) EN ISO 17640, Non-destructive testing of welds Ultrasonic testing Techniques, testing levels, and assessment (ISO 17640) EN ISO 23277, Non-destructive testing of welds Penetrant testing Acceptance levels (ISO 23277) EN ISO 23278, Non-d
47、estructive testing of welds Magnetic particle testing Acceptance levels (ISO 23278) BS EN 448:2015EN 448:2015 (E) 8 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 253:2009+A2:2015 and the following apply. 3.1 anchor construction used to transfer the
48、loads 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
49、together 3.4 cold formed bend bend manufactured by cold bending of steel pipe 3.5 cap not pre-insulated butt welded fitting to be welded on the end of a pipe or fitting 3.6 fitting reducer, tee, factory-made elbow and bend, cap, welding stub, mechanical joint 3.7 forged T-piece T-piece manufactured by hot forming of either steel pipes or steel plates which are subsequently welded together 3.8 hot formed b
