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3 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM DRAFT pren 488 October 2000 ICS Will supersede EN 488:1994 English 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 chauffage urbain - Systèmes bloqués de tuyaux préisolés pour les réseaux d'eau chaude enterrés directement - Robinets préisolés en acier, isolation thermique en polyuréthane et tube de protection en polyéthylène Fernwärmerohre - Werkmäßig gedämmte Verbundmantelrohrsysteme für erdverlegte Fernwärmenetze - Vorgedämmte Absperrarmaturen für Stahlmediumrohre mit Polyurethan-Wärmedämmung und Außenmantel aus Polyethylen This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 107. If this draft becomes a European Standard, 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. This draft European Standard was established by CEN 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 Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. pren 488:2000 E

4 Page 2 pren 488:2000 Contents Foreword 1 Scope 2 Normative references 3 Definitions 4 Requirements 4.1 Steel parts General requirements for valves Pressure ratings for valves Service temperatures for valves Steel service pipes Welding ends on valves Resistance to bending and axial forces Tightness of valves 4.2 Fusion welding of steel 4.3 Casing pipe 4.4 Polyurethane rigid foam insulation (PUR) 4.5 Valve assembly Ends of valve assembly End of stem construction Requirements for polyethylene welding Tightness of the welded casing pipe Increase in diameter of the casing pipe Minimum insulation thickness Tolerances on the main dimensions 5 Test methods 5.1 Test specimens 5.2 Steel parts Constructional testing of valves Tightness test of valves Testing of steel welds 5.3 Casing pipe 5.4 Polyurethane rigid foam insulation 5.5 Valve assembly 6 Marking 6.1 Casing pipes 6.2 Valve assembly 7 Maintenance Annex A (informative) Guidelines for inspection Annex B (informative) Installation of valves

5 Page 3 pren 488:2000 Foreword This European Standard supersedes EN 488:1994 and 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 the status of a national standard, either by publication of an identical text or by endorsement, at the latest by April 199X, and conflicting national standards shall be withdrawn at the latest by April 199X. The main areas of the revision are: - The title has been amended by District heating pipes ; - The term underground has been changed to directly buried ; - The mention of the production method injected (poured) has been deleted; - Two notes concerning commonly used types of valves and rules for calculation of loads and stresses in valve assemblies have been added to the scope; - Service pipes with nominal diameters from DN 700 up to and including DN 1200 have been added and the requirements have been amended accordingly; - Through the reference to EN 448 casing pipes with nominal outside diameters from 900 mm up to and including 1400 mm have been added and the requirements have been amended accordingly; - Through the reference to EN 448 the requirements for polyethylene welding have been changed. This specification is part of the standards for bonded systems using polyurethane foam thermal insulation applied, to bond to a steel service pipe and a polyethylene casing pipe. The other standards from TC 107 are: EN 253:199X - Pipes EN 448:199X - Fittings EN 489:199X - Joints In compiling this document WG 5 has made use of results of research carried out by system manufacturers, 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, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.

6 Page 4 pren 488: Scope This European Standard covers valve assemblies for directly buried hot water networks with preinsulated pipe assemblies in accordance with EN 253:199X. This European Standard specifies requirements and test methods for prefabricated thermally insulated valve assemblies, comprising a steel valve, rigid polyurethane foam insulation and an outer casing of polyethylene. This standard applies only to insulated valve assemblies for continuous operation with hot water at various temperatures in accordance with clause 1 of EN 253:199X. The estimation of expected thermal life with continuous operation at various temperatures is outlined in annex B of EN 253:199X. Guidelines for quality inspection are given in annex A of this standard. Guidelines for installation of valves are given in annex B of this standard. Note. For this application the following valve types are commonly used: Ball valves, gate valves, and butterfly valves. Note. This standard does not include rules for calculation of loads and stresses in the prefabricated thermally insulated valve 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 amendments 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 253:199X EN 448:199X ISO 5208:1982 ISO 5752:1982 Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assembly of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene Preinsulated bonded pipe systems for directly buried hot water networks. Fitting assemblies of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene Industrial valves - Pressure testing of valves Metal valves for use in flanged pipe systems - Face-to-face and centre-to-face dimensioning. 3 Definitions For the purpose of this standard, the applicable definitions given in EN 253:199X and EN 448:199X apply. For valve type terminology see clause 4 of ISO 5752:1982.

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