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1、BRITISH STANDARD BS EN 448:1995 Preinsulated bonded pipe systems for underground hot water networks Fitting assemblies of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene The European Standard EN 448:1994 has the status of a British Standard Licensed Copy: sheffi
2、eldun sheffieldun, na, Sat Nov 04 07:47:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 448:1995 This British Standard, having been prepared under the direction of the Refrigeration, Heating and Air Conditioning Standards Policy Committee, was published under the authority of the Standards Board
3、 and comes into effect on 15 March 1995 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference RHE/9 Draft for comment 91/71640 DC ISBN 0 580 23370 7 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this Eu
4、ropean Standard was prepared, comprises the national standards organizations of the following countries: AustriaOesterreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standard FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation Germany
5、Deutsches Institut fr Normung e.V. GreeceHellenic Organization for Standardization IcelandTechnological Institute of Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-ins
6、tituut NorwayNorges Standardiseringsforbund PortugalInstituto Portugus da Qualidade SpainAsociacin Espaola de Normalizacin y Certificacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since pu
7、blication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 448:1995 BSI 01-2000i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Text of EN 4483 National annex NA (informative
8、) Committees responsibleInside back cover National annex NB (informative) Cross-referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 448:1995 ii BSI 01-2000 National foreword This British Standard has been prepar
9、ed under the direction of the Refrigeration, Heating and Air Conditioning Standards Policy Committee and is the English language version of EN 448:1994 Preinsulated bonded pipe systems for underground hot water networks Fitting assemblies of steel service pipes, polyurethane thermal insulation and o
10、uter casing of high density polyethylene, published by the European Committee for Standardization (CEN). EN 448 was produced as a result of international discussion in which the UK took an active part. A British Standard does not purport to include all the necessary provisions of a contract. Users o
11、f British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 14, an inside
12、back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:35 GMT+00:00 2006, Uncontrolled Copy, (c) B
13、SI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 448 October 1994 ICS 23.040.90 Descriptors: Water pipelines, buried pipes, hot water, heating water pipes, pipe fittings, steels, thermal insulation, thermal insulation materials, polyurethane, polyethylene, specifications, tests, marking Engli
14、sh version Preinsulated bonded pipe systems for underground hot water networks Fitting assemblies of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene Systmes bloqus de tuyaux prisols pour les rseaux enterrs deau chaude Raccords prisols, tubes de service en acier,
15、 isolation thermique polyurthane et tube de protection en polythylne Werkmig gedmmte Verbundmantelrohrsysteme fr erdverlegte Fernwrmenetze Verbund-Formstcke bestehend aus Stahl-Mediumrohr, Polyurethan-Wrmedmmung und Auenmantel aus Polyethylen This European Standard was approved by CEN on 1994-10-14.
16、 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 be obtained on
17、application to the Central Secretariat 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 Central Secretariat
18、has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for St
19、andardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN 448:1994 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:35 GMT+00:00 2006, Uncontrolled Copy, (c) BS
20、I EN 448:1994 BSI 01-2000 2 Foreword This European Standard was drawn up by CEN/TC 107/WG 5, Fittings, under the Technical Committee CEN/TC 107, Prefabricated district heating pipe systems, the Secretariat of which is held by the Danish Standards Association. This European Standard shall be given th
21、e status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 1995, and conflicting national standards shall be withdrawn at the latest by April 1995. This specification is part of the standards for bonded systems using polyurethane foam therma
22、l insulation applied by injecting (pouring), to bond to a steel service pipe and a polyethylene casing pipe. The other standards from TC 107 are: EN 253:1994, Pipes. EN 488:1994, Valves. EN 489:1994, Joints. In compiling this document WG 5 has made use of results of research carried out by system ma
23、nufacturers, raw material suppliers, users, universities and research institutes. In accordance with the CEN/CENELEC Common Rules, the following CEN members are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxemburg,
24、 Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4Requirements3 4.1Steel parts3 4.2Casing pipes5 4.3Polyurethane rigid foam insulation (PUR)6 4.4Fitting assemblies6 5Test methods7 5.1Test specimens7 5.
25、2Steel parts8 5.3Casing pipes8 5.4Polyurethane rigid foam insulation (PUR)8 5.5Fitting assemblies8 6Marking9 6.1Casing pipes9 6.2Fitting assemblies9 Annex A (informative) Guidelines for inspection 10 Annex B (informative) Guidelines for welding polyethylene casing12 Annex C (informative) Bibliograph
26、y13 Figure 1 Examples4 Figure 2 Adaption of inside diameter5 Figure 3 Preparations of set-on branches6 Figure 4 Segmental casing pipe bends7 Figure 5 Main fitting dimensions9 Table 1 Tolerances4 Table 2 Centre line deviation7 Table 3 Main dimensions tolerances8 Table A.1 Steel parts inspection11 Tab
27、le A.2 Polyethylene casing, polyurethane and fitting assembly inspection12 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 448:1994 BSI 01-20003 1 Scope This European Standard specifies requirements and test methods for fittings of prefab
28、ricated thermally insulated pipe-in-pipe assemblies, comprising a steel service fitting from DN 20 to DN 600, rigid polyurethane foam insulation and an outer casing of polyethylene. However the quality requirements can be applied for larger dimensions. In this standard, fittings are defined as bends
29、, T-pieces, reducers and anchors. This standard applies only to injected (poured) insulated fitting assemblies for continuous operation with hot water at various temperatures in accordance with clause 1 of EN 253:1994. The estimation of expected life with continuous operation at various temperatures
30、 is outlined in Annex B of EN 253. Guidelines for quality inspection are given in Annex A of this standard. Guidelines for PE-HD-welding are given in Annex B of this standard. NOTEThis standard does not include rules for calculation of loads and stresses in the prefabricated thermally insulated pipe
31、-in-pipe assemblies. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent am
32、endments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 253:1994, Preinsulated bonded pipe systems for underground hot water netwo
33、rks Pipe assembly of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene. EN 287-1:1992, Approval testing of welders Fusion welding Part 1: Steels. EN 288-1:1992, Specification and qualification of welding procedures for fusion welding Part 1: General rules. EN 2581
34、7:1992, Arc-welded joints in steel Fusion welding Guidance on quality levels for imperfections. (ISO 5817:1991) ISO 1106-3:1984, Recommended practice for radiographic examination of fusion welded joints Part 3: Fusion welded circumferential joints in steel pipes of up to 50 mm wall thickness. ISO 34
35、19:1981, Non-alloy and alloy steel butt welding fittings. ISO 6761:1981, Steel tubes Preparation of ends of tubes and fittings for welding. INTERNATIONAL INSTITUTE OF WELDING (IIW) Collection of reference radiographs of welds 3 Definitions For the purposes of this standard, the following definitions
36、 apply, together with the definitions given in EN 253. 3.1 cold formed bend manufactured by cold bending of steel pipes 3.2 butt welding bend manufactured either by hot bending of steel pipes or by hot forming of steel plates which are subsequently welded together 3.3 bending angle- the deviation in
37、 direction of the steel pipe centre lines 3.4 forged T-piece manufactured by hot forming of either steel pipes or steel plates which are subsequently welded together 3.5 welding saddle a butt welding fitting to be welded into the main pipe for the welded connection between the main pipe and the bran
38、ch pipe in a T-piece 3.6 welded T-piece manufactured by welding together pieces of steel pipes with or without the use of a welding saddle or a drawn collar on the main pipe 3.7 reducer a butt welding fitting to be welded between two steel pipes of different diameters 3.8 anchor a steel construction
39、 used to transfer the axial load from the steel service pipe through the insulation and the casing to a fixed point 4 Requirements 4.1 Steel parts 4.1.1 Material The material shall be in accordance with 4.1.1 of EN 253:1994. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:35 GMT+00:00 2
40、006, Uncontrolled Copy, (c) BSI EN 448:1994 4 BSI 01-2000 4.1.2 Wall thickness and diameter The minimum nominal wall thickness of pipes and butt welding fittings shall prior to processing be at least the same as for the straight pipes. The nominal and the outside diameter shall be the same as the st
41、raight pipes in accordance with Table 1 of EN 253:1994. 4.1.3 Bends 4.1.3.1 Butt welding bends The dimensions shall be in accordance with 6.1.2 of ISO 3419:1981 with the exception that the bend radius can be larger, but not smaller. 4.1.3.2 Cold formed bends After bending, the minimum wall thickness
42、 of the bent pipe shall be not less than 85 % of the nominal wall thickness of the straight pipe (see Table 1 of EN 253:1994). The maximum ovality o in the bent area shall not exceed 6 %. The formula for the calculation of the ovality is: There shall be no folding in the bent area. Waves can be acce
43、pted, when the maximum height between trough and crest of the wave does not exceed 25 % of the nominal wall thickness of the bent pipe. 4.1.3.3 Tolerances of bending angles The deviation from the nominal bending angle shall not exceed the tolerances given in Table 1. Table 1 Tolerances 4.1.4 T-piece
44、s 4.1.4.1 Forged T-pieces The wall thicknesses T and T1 see Figure 4 of ISO 3419 shall be at least the same as those for the straight pipes (see Table 1 of EN 253). The other dimensions shall be in accordance with 6.1.4 of ISO 3419:1981. 4.1.4.2 Welding saddles Welding saddles shall be of the type w
45、hich shall be welded into the wall of the main pipe. The wall thicknesses of the welding saddles shall be at least the same as the wall thicknesses of the main pipes and the branch pipes which shall be welded to the saddles. Figure 1 Examples where dmaxis the maximum diameter; and dminis the minimum
46、 diameter in the same cross section in the bent area. o 2 dmaxdmin() dmaxdmin+ -100 %= Nominal diameter of service pipe Deviation tolerance u DN 200 2,0 DN 200 1,0 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 04 07:47:35 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 448:1994 BSI 01-20005 4.1.
47、4.3 Welded T-pieces Welded T-pieces shall be manufactured either by using welding saddles or by drawing a collar on which the branch pipe is welded or by welding the branch pipe directly to the main pipe. The wall thickness of the collar shall be at least the same as that for the branch pipe (see Ta
48、ble 1 of EN 253:1994). The collar shall be drawn opposite the welding seam in the main pipe. 4.1.4.4 Tolerances of angles between branch pipes and main pipes The branch pipes shall be perpendicular to the main pipes within a tolerance of 2,0. 4.1.5 Reducers Reducers shall be in accordance with 6.1.3
49、 of ISO 3419:1981, except for the wall thicknesses T and T1 see Figure 3 of ISO 3419:1981 which shall be at least the same as for the straight pipes (see Table 1 of EN 253:1994) to be welded to the fittings. 4.1.6 Anchors The wall thickness of the pipe shall be at least the same as for the straight pipe (see Table 1 of EN 253:1994). 4.1.7 Fusion welding of steel fittings 4.1.7.1 Material Filler metals shall after welding have mechanical cha
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