SIST EN 488:2004

SLOVENSKI STANDARD
SIST EN 488:2004
01-oktober-2004
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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
Fernwärmerohre - Werkmäßig gedämmte Verbundmantelsysteme für direkt erdverlegte
Fernwärmenetze - Vorgedämmte Absperrarmaturen für Stahlmediumrohre mit
Polyurethan-Wärmdämmung und Außenmantel aus Polyethylen
Tuyaux de chauffage urbain - Systemes bloqués de tuyaux préisolés pour les réseaux
d'eau chaude enterrés directement - Robinets préisolés pour tubes de service en acier,
isolation thermique en polyuréthane et tube de protection en polyéthylene
Ta slovenski standard je istoveten z: EN 488:2003
ICS:
23.040.10 Železne in jeklene cevi Iron and steel pipes
23.060.01 Ventili na splošno Valves in general
91.140.65 Oprema za ogrevanje vode Water heating equipment
SIST EN 488:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 488:2004

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SIST EN 488:2004
EUROPEAN STANDARD
EN 488
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2003
ICS 23.060.01 Supersedes 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 Fernwärmerohre - Werkmäßig gedämmte
préisolés pour les réseaux d'eau chaude enterrés Verbundmantelsysteme für direkt erdverlegte
directement - Robinets préisolés pour tubes de service en Fernwärmenetze - Vorgedämmte Absperrarmaturen für
acier, isolation thermique en polyuréthane et tube de Stahlmediumrohre mit Polyurethan-Wärmdämmung und
protection en polyéthylène Außenmantel aus Polyethylen
This European Standard was approved by CEN on 28 November 2002.
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 application to the Management Centre 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 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,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovak Republic, Spain, Sweden, Switzerland and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 488:2003 E
worldwide for CEN national Members.

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SIST EN 488:2004
EN 488:2003 (E)
Contents
page
Foreword.4
Introduction .5
1 Scope .6
2 Normative references .6
3 Terms and definitions.6
4 Requirements .6
4.1 Steel parts.6
4.1.1 General requirements for valves.6
4.1.2 Pressure ratings for valves.7
4.1.3 Service temperatures for valves.7
4.1.4 Steel service pipes.7
4.1.5 Welding ends on valves .7
4.1.6 Resistance to bending and axial forces .7
4.1.7 Leak-tightness of valves .9
4.2 Fusion welding of steel .9
4.3 Casing .9
4.4 Polyurethane rigid foam insulation (PUR).9
4.5 Valve assembly .9
4.5.1 Ends of valve assembly .9
4.5.2 End of stem construction.9
4.5.3 Requirements for polyethylene welding.9
4.5.4 Leak-tightness of the welded casing .9
4.5.5 Increase in diameter of the casing pipe .9
4.5.6 Minimum insulation thickness.9
4.5.7 Tolerances on the main dimensions.10
5 Test methods.10
5.1 General.10
5.2 Test specimens .10
5.3 Steel parts.10
5.3.1 Constructional testing of valves .10
5.3.2 Leak-tightness test of valves.11
5.3.3 Testing of steel welds.11
5.4 Casing .11
5.5 Polyurethane rigid foam insulation.11
5.6 Valve assembly .11
6 Marking .12
6.1 General.12
6.2 Steel valve.12
6.3 Casing .12
6.4 Valve assembly .12
7 Installation and maintenance.12
Annex A (informative)  Guidelines for inspection and testing.13
A.1 Manufacturer’s type test .13
A.2 Manufacturer’s quality surveillance.13
A.3 External inspection.13
A.4 Extent of inspection.13
A.5 Manufacturer’s responsibility.13
2

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SIST EN 488:2004
EN 488:2003 (E)
Annex B (informative)  Guideline for installation of valves .15
Bibliography .16
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SIST EN 488:2004
EN 488:2003 (E)
Foreword
This document (EN 488:2003) 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 publication of an identical text or
by endorsement, at the latest by August 2003, and conflicting national standards shall be withdrawn at the latest by
August 2003.
This document supersedes EN 488:1994.
Annexes A and B are informative.
This document includes a Bibliography.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,
Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
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SIST EN 488:2004
EN 488:2003 (E)
Introduction
The first edition of EN 488 was approved in 1994. 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 mentioning in the foreword 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 casings 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.
For information on the minimum expected thermal life with operation at various temperatures with respect to PUR
foam performance see EN 253:2003, annex B.
The other standards from TC 107 are:
EN 253:2003, 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 polyethylene.
EN 448:2003, 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 489:2003, District 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.
EN 13941:2003, Design and installation of preinsulated bonded pipe systems for district heating.
NOTE The following draft in connection with the above mentioned is under development:
prEN 14419, District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Surveillance
systems.
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SIST EN 488:2004
EN 488:2003 (E)
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 networks with preinsulated pipe assemblies in accordance with EN 253.
This standard applies only to insulated valve assemblies for continuous operation with hot water at various
temperatures in accordance with clause 1 of EN 253:2003.
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 1 For this application the following valve types are commonly used: ball valves, gate valves, and butterfly valves.
NOTE 2 This standard does not include rules for calculation of loads and stresses.
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 ame
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