1、BSI Standards PublicationBS EN 488:2015District heating pipes Preinsulated bonded pipesystems for directly buriedhot water networks Steelvalve assembly for steel servicepipes, polyurethane thermalinsulation and outer casing ofpolyethyleneBS EN 488:2015 BRITISH STANDARDNational forewordThis British S
2、tandard is the UK implementation of EN 488:2015.It supersedes BS EN 488:2011 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee RHE/9, Insulated underground pipelines.A list of organizations represented on this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 se
3、cretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 85226 8ICS 23.060.01Compliance with a British Standard cannot
4、 confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards 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 488:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM E
5、N 488 November 2015 ICS 23.060.01 Supersedes EN 488:2011+A1:2014English Version 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 Tuyaux de
6、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 Verbundmantelrohrsysteme fr direkt erdverlegte
7、 Fernwrmenetze - Vorgedmmte Absperrarmaturen fr Stahlmediumrohre mit 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 givi
8、ng 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 offi
9、cial 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,
11、Sweden, Switzerland, Turkey andUnited 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 488:2015 EBS EN 488:2015EN 488:2015 (E) 2 Contents Page European foreword . 4 Introduction 5 1 Scope 6 2 Normative references 6 3 Terms and definitions . 7 4 Requirements . 8 4.1 Pressure ratings for valves 8 4.1.1 General 8 4.1.2 Valves without indicated flow dire
13、ction . 8 4.2 Service temperatures for valves 9 4.3 Steel parts 9 4.3.1 General 9 4.3.2 Valve. 9 4.3.3 Valve extension pipe 9 4.3.4 Welding ends 9 4.3.5 Welding of steel parts 9 4.4 Casing 9 4.4.1 General 9 4.4.2 Requirements for polyethylene welding 9 4.4.3 Diameter and wall thickness of the casing
14、 10 4.5 Polyurethane rigid foam insulation (PUR) . 10 4.5.1 General . 10 4.5.2 Minimum insulation thickness 10 4.6 Valve assembly 10 4.6.1 Ends of valve assembly . 10 4.6.2 End of stem construction . 10 4.6.3 Main dimensions of the valve assembly . 11 4.6.4 Installation of measuring elements . 12 4.
15、7 Requirements for effective operation and maintenance . 12 4.8 Resistance to axial forces and bending moments. 12 5 Testing, test methods and test requirements 13 5.1 General . 13 5.2 Test specimens 13 5.2.1 General . 13 5.2.2 Test specimens for type testing steel parts of valve 13 5.2.3 Test speci
16、mens from casings and polyurethane foam 13 5.3 Steel parts . 13 5.3.1 General . 13 5.3.2 Type test of the steel parts 13 5.3.3 Production testing of valves . 17 5.4 Casing . 18 5.4.1 General . 18 5.4.2 Leak-tightness of the welded casing . 18 5.5 Polyurethane rigid foam insulation 18 5.6 Valve assem
17、bly 18 5.7 Surveillance system . 18 BS EN 488:2015EN 488:2015 (E) 3 6 Marking 18 6.1 General . 18 6.2 Steel valve 18 6.3 Casing 18 6.4 Valve assembly 19 7 Installation and maintenance 19 Annex A (informative) Guidelines for inspection and testing . 20 A.1 General . 20 A.2 Manufacturers type test 20
18、A.3 Manufacturers quality control 20 A.4 External inspection 20 A.5 Extent of inspection . 20 A.6 Manufacturers responsibility . 20 Annex B (normative) Resistance to axial force and bending moment . 22 B.1 Axial strength test 22 B.2 Bending test 22 Annex C (normative) Resistance to bending forces 24
19、 C.1 General . 24 C.2 Standard test assembly (four point bending test) 25 Bibliography . 29 BS EN 488:2015EN 488:2015 (E) 4 European foreword This document (EN 488:2015) has been prepared by Technical Committee CEN/TC 107 “Prefabricated district heating and district cooling pipe systems”, the secret
20、ariat 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 national standards shall be withdrawn at the latest by May 2016. Attention is drawn to the p
21、ossibility 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 supersedes EN 488:2011+A1:2014. In comparison with the previous edition, the main changes in EN 488
22、:2015 are: improvement and simplification of the type test of the steel valve. The cycle test has been integrated in the test sequence; the formulae in Annex C for the calculation of bending forces have been improved. C.1.3 of EN 488:2011+A1:2014 concerning alternative test application for diameters
23、 DN 200 mm, has been deleted. 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 Repu
24、blic of Macedonia, 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. BS EN 488:2015EN 488:2015 (E) 5 Introduction EN 488 has a
25、lso been aligned with EN 448 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 pol
26、yethylene; 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 heating pipes Preinsulated bonded pipe systems for directly
27、buried hot 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 direct
28、ly buried hot 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, polyu
29、rethane thermal insulation and outer casing of polyethylene; EN 15698-2, District heating pipes Preinsulated bonded twin pipe systems for directly buried hot water networks Part 2: Fitting and valve assembly of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene. BS
30、 EN 488:2015EN 488:2015 (E) 6 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 insulation and an outer casing of polyethylene for use in directly buried hot water
31、networks with pre-insulated pipe assemblies in accordance with EN 253. This European Standard applies only to factory made prefabricated insulated valve assemblies for continuous operation with hot water at various temperatures in accordance with EN 253:2009+A2:2015, Clause 1 and the valve assemblie
32、s with a maximum operation pressure of 25 bar. For higher pressures, additional demands apply. NOTE For this application, the following valve types are commonly used: ball valves, gate valves, and butterfly valves. This European Standard does not include calculation rules for loads and stresses. The
33、se depend on the configuration of the system as it is installed. The design and installation rules 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,
34、only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 19, Industrial valves Marking of metallic valves EN 253:2009+A2:2015, District heating pipes Preinsulated bonded pipe systems for directly buried hot water net
35、works Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene EN 448:2015, District heating pipes Preinsulated bonded pipe systems for directly buried hot water networks Fitting assemblies of steel service pipes, polyurethane thermal insulation and outer
36、 casing of polyethylene EN 736-1, Valves - Terminology Part 1: Definition of types of valves EN 10088-1:2014, Stainless steels Part 1: List of stainless steels EN 10204, Metallic products Types of inspection documents EN 12266-1, Industrial valves Testing of metallic valves Part 1: Pressure tests, t
37、est procedures and acceptance criteria Mandatory requirements EN 12502-4, Protection of metallic materials against corrosion Guidance on the assessment of corrosion likelihood in water distribution and storage systems Part 4: Influencing factors for stainless steels EN 13941:2009+A1:2010, Design and
38、 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 ISO 12944-2, Paints and varnishes Corrosion protection of steel structures by protective paint syste
39、ms Part 2: Classification of environments (ISO 12944-2) BS EN 488:2015EN 488:2015 (E) 7 EN ISO 12944-5, Paints and varnishes Corrosion protection of steel structures by protective paint systems Part 5: Protective paint systems (ISO 12944-5) 3 Terms and definitions For the purposes of this document,
40、the terms and definitions given in EN 253:2009+A2:2015 and EN 448 and the following apply. For types of valves, the terms and definitions given in EN 736-1 apply. 3.1 nominal pressure (PN) class alphanumeric designation used for reference purposes related to a combination of mechanical and dimension
41、al characteristics of a component of a pipe work system Note 1 to entry: It comprises the letters PN followed by a dimensionless number. Note 2 to entry: The number following the letters PN does not represent a measurable value and should not be used for calculation purposes except where specified i
42、n the relevant standard. Note 3 to entry: The designation PN is not meaningful unless it is related to the relevant component standard number. Note 4 to entry: The maximum allowable pressure of a pipework component depends on the PN number, the material and design of the component, its maximum allow
43、able temperature, etc. The relevant European Component standards include tables of specified pressure/temperature ratings or, in minimum, include rules how to determine pressure/temperature ratings. Note 5 to entry: It is intended that all components with the same PN and DN designations have the sam
44、e mating dimensions for compatible flange types. SOURCE: EN 1333:2006, 2.1, modified added Note 1 to entry. 3.2 maximum operation pressure maximum internal pressure acting against the pipe wall at any point or in any section of the pipeline at a given operating temperature SOURCE: EN 13941:2009+A1:2
45、010, 3.1.19, modified 3.3 nominal size DN alphanumeric designation of size, common to components in piping systems which are used for reference purposes SOURCE: EN ISO 6708:1995, 2.1, modified 3.4 valve assembly assembly of valve, valve extension pipe, PE-casing and PUR-foam Note 1 to entry: Figure
46、1 gives an example of a valve assembly and its components. BS EN 488:2015EN 488:2015 (E) 8 Key a valve b valve extension pipe c valve assembly d service pipe e insulation Figure 1 Example valve assembly components 3.5 valve part of the valve assembly supplied by the valve manufacturer (with or witho
47、ut valve extension pipe) 3.6 valve extension pipe pipe part of the valve assembly welded to the valve Note 1 to entry: The valve extension may be required before the insulation process. This can be done by the valve manufacturer or the insulation manufacturer. The valve can be extended with valve ex
48、tension pipes before insulation or delivered by the valve manufacturer with extensions. 3.7 steel service pipe service pipe according to EN 253:2009+A2:2015 4 Requirements 4.1 Pressure ratings for valves 4.1.1 General The valves shall be designed for use in pipe systems with a maximum operating pres
49、sure of 16 bar or 25 bar. The valves shall be able to withstand a strength test pressure of the district heating system of 1,3 times the maximum operating pressure at ambient temperature in open and closed position. 4.1.2 Valves without indicated flow direction Valves without an indicated flow direction shall support the pressure load in both directions. BS EN 488:2015EN 488:2015 (E) 9 4.2 Service temperatures for valves The valves shall be able to withstand c
