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1、BRITISH STANDARD BS EN 489:1995 Preinsulated bonded pipe systems for underground hot water networks Joint assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene The European Standard EN 489:1994 has the status of a British Standard BS EN 489:1995 This Brit
2、ish 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 and comes into effect on 15 March 1995 BSI 04-2000 The following BSI references relate to the work on this st
3、andard: Committee reference RHE/9 Draft for comment 91/75035 DC ISBN 0 580 23366 9 Cooperating organizations The European Committee for Standardization, under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: AustriaOest
4、erreichisches Normungsinstitut BelgiumInstitut belge de normalisation DenmarkDansk Standard FinlandSuomen Standardisoimisliito, r.y. FranceAssociation franaise de normalisation GermanyDeutsches Institut fr Normung e.V. GreeceHellenic Organization for Standardization IcelandTechnological Institute of
5、 Iceland IrelandNational Standards Authority of Ireland ItalyEnte Nazionale Italiano di Unificazione LuxembourgInspection du Travail et des Mines NetherlandsNederlands Normalisatie-instituut NorwayNorges Standardiseringsforbund PortugalInstituto Portugus da Qualidade SpainAsociacin Espaola de Normal
6、izacin y Certificacin SwedenStandardiseringskommissionen i Sverige SwitzerlandAssociation suisse de normalisation United KingdomBritish Standards Institution Amendments issued since publication Amd. No.DateComments BS EN 489:1995 BSI 04-2000i Contents Page Cooperating organizationsInside front cover
7、 National forewordii Foreword2 Text of EN 4893 National annex NA (informative) Committees responsibleInside back cover National annex NB (informative) Cross-referencesInside back cover BS EN 489:1995 ii BSI 04-2000 National foreword This British Standard has been prepared under the direction of the
8、Refrigeration, Heating and Air Conditioning Standards Policy Committee and is the English language version of EN 489:1994 Preinsulated bonded pipe systems for underground hot water networks Joint assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene, publ
9、ished by the European Committee for Standardization (CEN). EN 489 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 of British Standards are responsible for their
10、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 10, an inside back cover and a back cover. This standard has
11、 been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 489 October 1994 ICS 23.040.60; 23.040.90; 91.140.10 Descriptors: Water pipelines, buried pipes,
12、hot water, steel tubes, pipe fittings, joining, welded joints, thermal insulation, polyurethane, polyethylene, specifications, tests English version Preinsulated bonded pipe systems for underground hot water networks Joint assembly for steel service pipes, polyurethane thermal insulation and outer c
13、asing of polyethylene Systmes bloqus de tuyaux prisols pour les rseaux enterrs deau chaude Assemblage pr-isol Tube de service en acier, isolation thermique en polyurthane, tube de protection en polythylne Werksmig gedmmte Verbundmantelrohrsysteme fr erdverlegte Fernwrmenetze Rohrverbindungen fr Stah
14、lmediumvohre mit Polyurethan-Wrmedmmung und Auenmantel aus Polyethylen This European Standard was approved by CEN on 1994-10-14. 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 standar
15、d without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on 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 lang
16、uage made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat 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
17、, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members
18、Ref. No. EN 489:1994 E EN 489:1994 BSI 04-2000 2 Foreword This European Standard was prepared by CEN/TC 107/WG 4 “Joints” 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 Standa
19、rd shall be given the 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 series of standards for bonded systems
20、using polyurethane foam thermal insulation applied by injection (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 448:1994, Fittings. EN 488:1994, Valves. In compiling this document, WG 4 has made use of results of
21、research carried out by system manufacturers, raw material suppliers, users, universities and research institutes. In accordance with the Common CEN/CENELEC Rules the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Icela
22、nd, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4Requirements3 4.1General requirements3 4.2Type test requirements4 4.3Installation instructions4 5Methods for type tests4
23、 5.1Soil stress test4 5.2PUR-foam5 Annex A (normative) Fusion welding of steel service pipes7 Annex B (informative) General guidelines for inspection of the joint on site8 Annex C (informative) Assumptions made to establish functional requirements of joints9 Figure 1 Minimum dimensions of sand box5
24、Figure 2 Standard sand quality6 Figure 3 Specimen for testing ageing resistance of joint foam6 Figure C.1 Maximum expansion movements10 Table B.1 Inspection programme for the steel welds8 Table B.2 Inspection programme for insulating and sealing9 EN 489:1994 BSI 04-20003 1 Scope This standard specif
25、ies requirements for joints, made under field conditions, between adjacent preinsulated pipes and/or fittings in district heating networks. The standard covers jointing of steel service pipes by means of fusion welding, the connecting of casing pipe ends with joint casings and the thermal insulation
26、 with poured rigid PUR-foam. This standard specifies methods for type tests of complete joints and PUR-foam for joints under laboratory conditions. Field made T-branches, reducers, caps, etc. are excluded from this standard. 2 Normative references This European standard incorporates by dated or unda
27、ted 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 amendments to or revisions of any of these publications apply to this European Standard only when
28、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 networks Pipe assembly of steel pipes, polyurethane thermal insulation and outer casing of polyethyle
29、ne. 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 25817:1992, Arc-welded joints in steel materials Guidance on quality levels for imperfections. (ISO 5817:199
30、2) 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 6520:1982, Classification of imperfections in metallic fusion welds, with explanations. ISO 6761:1981, Steel tu
31、bes Preparation of ends of tubes and fittings for welding. ISO 7963:1985, Welds in steel Calibration block No. 2 for ultrasonic examination of welds. INTERNATIONAL INSTITUTE OF WELDING (IIW) Collection of reference radiographs of welds 3 Definitions For the purpose of this standard, the following de
32、finitions apply. 3.1 joint the complete construction of the connection between adjacent pipes and/or fittings 3.2 joint casing is the part that connects the two pipe casing ends in a joint 3.3 steel weld is the connection between the service pipes in accordance with EN 25817 4 Requirements A joint c
33、onstruction in an underground hot water network shall meet the following requirements. The assumptions made to establish these requirements are given in Annex C. 4.1 General requirements The joint shall be: watertight; resistant to axial forces initiated by axial movements of the pipe in the ground;
34、 resistant to radial forces and bending moments; resistant to effects of temperature and temperature variations. 4.1.1 Construction of the joint Each individual step in the construction of a joint shall follow the system suppliers installation instructions in order to ensure that the joint obtained
35、is equivalent to the joint as previously type tested. 4.1.2 Competence of the welder and fitter The welder shall have a valid certificate in accordance with EN 287-1. Fitters dealing with the joint sealing and insulation work shall receive appropriate training relevant to the pipe system. 4.1.3 Expe
36、cted life and long term temperature resistance The requirements for expected life and long term temperature resistance shall be in accordance with 4.4.4 of EN 253:1994. EN 489:1994 4 BSI 04-2000 4.1.4 Service pipe weld The steel service pipe weld shall: be tight when tested in accordance with clause
37、 A.5; have mechanical properties equivalent to those of the service pipe. 4.1.5 Polyurethane rigid foam insulation (PUR) The PUR-foam shall completely fill the joint. The requirements for the rigid PUR-foam insulation shall be in accordance with 4.3.2, 4.3.3.1, 4.3.4 and 4.3.5 of EN 253:1994. 4.1.6
38、Joint casing The joint casing shall be tight against external. water pressure when tested in accordance with 5.1.5. 4.2 Type test requirements 4.2.1 Soil stress test No water ingress shall be detected after the soil stress test in accordance with 5.1. 4.2.2 PUR properties The PUR properties shall be
39、 in accordance with 4.3 and 4.4 of EN 253:1994. 4.3 Installation instructions Installation instructions, crucial for the quality of the installed joint and for achieving the expected life, shall be a part of the manufacturers documentation and shall be supplied together with the component parts. The
40、 installation instructions shall, as a minimum, deal with the following topics. 4.3.1 Work environment Proper procedures to obtain optimum work conditions on site shall be specified. 4.3.2 Cleaning Proper procedures for the cleaning and drying shall be specified for: steel pipe surfaces; insulation
41、surfaces; joint casing surfaces; casing pipe surfaces. The sentence “Any wet foam shall be removed from the pipe ends” shall be included in the instructions. 4.3.3 Leak detection system When a leak detection system is installed proper procedures for connecting the leak detection system shall be spec
42、ified. This specification shall, as a minimum, include: general handling instructions to avoid damaging the system; procedures for positioning and connecting adjacent pipes to ensure the function of the system; procedures and test methods to check the function of the leak detection system during con
43、struction. 4.3.4 Steel weld Proper procedures for the steel weld shall be described. The description shall, as a minimum, include the parts “Welding process” and “Preparation for welding and lining up” in accordance with Annex A. 4.3.5 Joint casing Proper handling and installation procedures for the
44、 joint casing shall be specified. 4.3.6 Foaming Proper procedures for the foaming shall be described. The following paragraphs shall, as a minimum, be included. Surface temperatures should be between 15 C and 45 C. If other temperatures occur, precautions shall be taken. Temperature of PUR-component
45、s shall be kept between 15 C and 25 C. Precautions shall be taken to optimize venting of the joint and to prevent excessive foam losses. 5 Methods for type tests 5.1 Soil stress test The soil stress test shall be carried out as follows. 5.1.1 Sand box A box with minimum dimensions as shown in Figure
46、 1 shall be used. The box shall be provided with a rigid compression plate that covers the entire box. 5.1.2 Sand Natural sand in air dried condition at room temperature with a grain distribution as shown in Figure 2 shall be used. 5.1.3 Test specimens Three test specimens of minimum length 2,5 m sh
47、all be used. Each test specimen shall comprise a joint made by welding together two prefabricated pipe ends. Two test specimens shall be made of pipes with casing pipe diameter 160 mm and one specimen shall be made of pipe with casing pipe diameter 250 mm. The test can also be applied on other casin
48、g pipe diameters. EN 489:1994 BSI 04-20005 5.1.4 Sand box test The following test parameters shall be used. service pipe temperature of 120 C maintained for 24 h before the testing; simulated sand overfill of 1 m (18 kN/m2); displacement of 75 mm; forward speed of 10 mm/min; backward speed of 50 mm/
49、min; 100 cycles, where a cycle is defined as one forward and one backward movement without pause. 5.1.5 Water impermeability test Following the test in clause 5.1.4, each joint shall be immersed in a watertank at 30 C and pressurized externally with a constant pressure of 30 kPa for a period of 24 h. To facilitate assessment of water ingress, the liquid can be coloured. 5.2 PUR-foam The type tests for polyurethane rigid foam for joints shall be carried o