1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 488:2011District heating pipes Preinsulated bonded pipesystems for directly buriedhot water networks Steelvalve assembly for steel servicepipes, polyurethane thermalinsulat
2、ion and outer casing ofpolyethyleneCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 488:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation
3、of EN 488:2011. Itsupersedes BS EN 488:2003 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee RHE/9, Insulated underground pipelines.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not
4、 purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 66404 5ICS 23.060.01; 91.140.60Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authori
5、ty of theStandards Policy and Strategy Committee on 30 April 2011.Amendments issued since publicationDate Text affectedCopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 488:2
6、011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 488 March 2011 ICS 23.060.01 Supersedes EN 488:2003English Version District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Steel valve assembly for steel service pipes, polyurethane thermal insulation
7、and outer casing of polyethylene Tuyaux de chauffage urbain - Systmes bloqus de tuyaux prisols pour les rseaux deau chaude enterrs directement - Robinets prisols pour tubes de service en acier, isolation thermique en polyurthane et tube de protection en polythylne Fernwrmerohre - Werkmig gedmmte Ver
8、bundmantelsysteme fr direkt erdverlegte Fernwrmenetze - Vorgedmmte Absperrarmaturen fr Stahlmediumrohre mit Polyurethan-Wrmedmmung und Auenmantel aus Polyethylen This European Standard was approved by CEN on 19 February 2011. CEN members are bound to comply with the CEN/CENELEC Internal Regulations
9、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 application to the CEN-CENELEC Management Centre or to any CEN member. This
10、 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN membe
11、rs are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
12、Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membe
13、rs. Ref. No. EN 488:2011: ECopyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-BS EN 488:2011EN 488:2011 (E) 2 Contents Page Foreword 41 Scope 72 Normative references 73 Terms and de
14、finitions .74 Requirements .94.1 Pressure ratings for valves .94.1.1 General 94.1.2 Valves without indicated flow direction 94.2 Service temperatures for valves 94.3 Steel parts .94.3.1 General 94.3.2 Valve . 104.3.3 Valve extension pipe 104.3.4 Welding ends . 104.3.5 Welding of steel parts 104.4 Ca
15、sing 104.4.1 General . 104.4.2 Requirements for polyethylene welding 104.4.3 Diameter and wall thickness of the casing 104.5 Polyurethane rigid foam insulation (PUR) . 104.5.1 General . 104.5.2 Minimum insulation thickness 104.6 Valve assembly . 114.6.1 Ends of valve assembly . 114.6.2 End of stem c
16、onstruction 114.6.3 Main dimensions of the valve assembly 124.6.4 Installation of measuring elements. 134.7 Requirements for effective operation and maintenance 134.8 Resistance to axial forces and bending moments 145 Testing, test methods and test requirements 145.1 General . 145.2 Test specimens .
17、 145.2.1 General . 145.2.2 Test specimens for type testing steel parts of valve 145.2.3 Test specimens from casings and polyurethane foam. 145.3 Steel parts 145.3.1 General . 145.3.2 Type test of the steel parts 145.3.3 Production testing of valves 175.4 Casing 175.4.1 General . 175.4.2 Leak-tightne
18、ss of the welded casing 175.5 Polyurethane rigid foam insulation . 175.6 Valve assembly . 185.7 Surveillance system . 186 Marking 186.1 General . 186.2 Steel valve . 186.3 Casing 18Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or
19、 networking permitted without license from IHS-,-,-BS EN 488:2011EN 488:2011 (E) 3 6.4 Valve assembly 187 Installation and maintenance . 19Annex A (informative) Guidelines for inspection and testing 20A.1 General . 20A.2 Manufacturers type test . 20A.3 Manufacturers quality control . 20A.4 External
20、inspection . 20A.5 Extent of inspection 20A.6 Manufacturers responsibility 20Annex B (normative) Resistance to axial force and bending moment 23B.1 Axial strength test . 23B.2 Bending test . 23Annex C (normative) Resistance to bending forces . 25C.1 Resistance to bending forces 25C.1.1 General . 25C
21、.1.2 Formulas based on the considerations 25C.1.3 Standard test assembly (four point bending test) . 27C.1.3.1 Bending moment from test load . 27C.1.3.2 Bending Moment from uniform load q (pipe weight and where appropriate water weight) 28C.1.3.3 Bending moment from valve weight 29C.1.3.4 Total Bend
22、ing Moment (Mtotal) due to F, Pand FV. 29C.1.4 Alternative test assembly (for diameters DN 200 mm) Maximum bending moment 30Bibliography 32Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networking permitted without license from
23、 IHS-,-,-BS EN 488:2011EN 488:2011 (E) 4 Foreword This document (EN 488:2011) has been prepared 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
24、publication of an identical text or by endorsement, at the latest by September 2011, and conflicting national standards shall be withdrawn at the latest by September 2011. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or
25、 CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 488:2003. Annex A is informative, Annexes B and C are normative. This document includes a Bibliography. The first edition of EN 488 was approved in 1994. The first revised standard was p
26、ublished in 2003. In this second revision, in general the whole standard has been edited to make it more readable. Requirements and test methods have been separated; therefore, clause numbers have changed and some clauses have been split up in several clauses. Exact references for changes are not al
27、ways possible. The main areas of the current revision are: a) The scope has been amended. The standard applies no longer only to insulated valve assemblies for continuous operation with hot water at various temperatures in accordance with EN 253:2009, Clause 1 but also to the valve assemblies with a
28、 maximum operation pressure of 25 bar. For higher pressure, additional demands apply. It is also explained that the calculation rules of loads and stresses are not included. They depend on the configuration of the system as it is installed. The design and installation rules are given in EN 13941:200
29、9+A1:2010. b) In Clause 3, “terms and definitions“, definitions for the nominal pressure (PN), nominal size (DN) and maximum operation pressure have been added. A figure “Example valve assembly components“ of a valve assembly, its components and definitions has been added. c) Clause 4, “requirements
30、“ 1) material of the steel parts in the pressurized parts of the valve shall be certified in accordance with EN 10204, the 3.1 certificate (4.3.1); 2) it is added that flanged or screwed connections, except sealing system at the stem, shall not be used except in the non-pressurized area e.g. for the
31、 stem extensions (4.3.2); 3) the requirements for the use of stop devices are amended (4.7); 4) the minimum water temperature has been adjusted to 4 C (4.2); 5) 4.3.5 “Welding of steel parts“ has been changed and adjusted to EN 13941:2009+A1:2010 and the text in EN 448; 6) 4.1.6 has become 4.8 “resi
32、stance to axial forces bending moments” and has been rewritten in Annex B; 7) additions have been made to the requirements to the corrosion protection of the stem (see 4.6); Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo reproduction or networ
33、king permitted without license from IHS-,-,-BS EN 488:2011EN 488:2011 (E) 5 8) the Clause “increase in diameter“ has been changed to “diameter and wall thickness of the casing“ (see 4.4.3); 9) a table with the tolerances of the main dimensions has been added together with a figure to explain the dim
34、ensions (see 4.6.3); 10) a clause was added about the installation of measuring elements for surveillance (see 4.6.4). d) Clause 5, “test methods“ 1) the clause “Testing, test methods and test requirements“ has been adjusted to make the order of test clearer; 2) a test for the surveillance system is
35、 added (see 5.7). e) Clause 6, “marking“ 1) for the steel valve pressure and temperature and marking with closed and open position; 2) for the casing the date of manufacture has been changed to year and week of manufacture (see 6.3); 3) for the valve assembly, the type of blowing agent and diffusion
36、 barrier has been added (see 6.4). f) Annex A, “guidelines for inspection and testing“ 1) the clause about quality surveillance had been changed in quality control (see A.3); 2) a table for the valve assembly inspection had been added. g) Former Annex B, the guidelines for installation of the valves
37、 has been deleted. New Annexes B and C have been added, in which the actual testing is included. h) The former Table 1, “Service pipe dimensions and test forces” has been changed due to cold laying conditions. Therefore, the compressive forces have been adapted. In this table the maximum allowable b
38、ending moments have been included and the table has been moved to Annex B. i) A description of the test method for bending forces has been added in Annex C. In general, references were changed were needed. If possible references to European standards were used. For information on the minimum expecte
39、d thermal life with operation at various temperatures with respect to PUR foam performance see EN 253. The other standards from CEN/TC 107 covering this subject are: EN 253, District heating pipes Preinsulated bonded pipe systems for directly buried hot water networks Pipe assembly of steel service
40、pipe, polyurethane thermal insulation and outer casing of polyethylene; EN 448, 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; EN 489, District
41、 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; Copyright European Committee for Standardization Provided by IHS under license with CENNot for ResaleNo rep
42、roduction or networking permitted without license from IHS-,-,-BS EN 488:2011EN 488:2011 (E) 6 EN 13941:2009+A1:2010, 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 netw
43、orks 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 thermal insulati
44、on and outer casing of polyethylene. 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, France, Germa
45、ny, 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 Standardization Provided by IHS under license with CENNot for Re
46、saleNo reproduction or networking permitted without license from IHS-,-,-BS EN 488:2011EN 488:2011 (E) 7 1 Scope This European Standard specifies requirements and test methods for valves of prefabricated thermally insulated valve assemblies comprising a steel valve, rigid polyurethane foam insulatio
47、n and an outer casing of polyethylene for use in directly buried hot water networks with pre-insulated pipe assemblies in accordance with EN 253. This European Standard applies only to insulated valve assemblies for continuous operation with hot water at various temperatures in accordance with EN 25
48、3:2009, Clause 1 and the valve assemblies with a maximum operation pressure of 25 bar. For higher pressures, additional demands apply. Guidelines for quality inspection are given in Annex A of this European Standard. NOTE For this application, the following valve types are commonly used: ball valves, gate v
