EN 488:2019

SLOVENSKI STANDARD
01-januar-2020
Nadomešča:
SIST EN 488:2016
Cevi za daljinsko ogrevanje - Poviti enocevni sistemi za neposredno vkopana
vročevodna omrežja - Tovarniško izdelan sestav jeklenih ventilov za jeklene
delovne cevi, obdane s poliuretansko toplotno izolacijo in zaščitnim plaščem iz
polietilena
District heating pipes - Bonded single pipe systems for directly buried hot water networks
- Factory made steel valve assembly for steel service pipes, polyurethane thermal
insulation and a casing of polyethylene
Fernwärmerohre - Werkmäßig gedämmte Verbundmantelrohrsysteme für direkt
erdverlegte Fernwärmenetze - Vorgedämmte Absperrarmaturen für Stahlmediumrohre
mit Polyurethan-Wärmedämmung und Außenmantel aus Polyethylen
Tuyaux de chauffage urbain - Systèmes bloqués monotubes pour les réseaux d'eau
chaude enterrés directement - Assemblages d'appareils de robinetterie manufacturés
pour tubes de service en acier, isolation thermique en polyuréthane et tube de protection
en polyéthylène
Ta slovenski standard je istoveten z: EN 488:2019
ICS:
23.040.07 Cevovodi za daljinsko Pipeline and its parts for
ogrevanje in njihovi deli district heat
23.060.01 Ventili na splošno Valves in general
91.140.65 Oprema za ogrevanje vode Water heating equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 488
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 23.060.01 Supersedes EN 488:2015
English Version
District heating pipes - Bonded single pipe systems for
directly buried hot water networks - Factory made steel
valve assembly for steel service pipes, polyurethane
thermal insulation and a casing of polyethylene
Tuyaux de chauffage urbain - Systèmes bloqués Fernwärmerohre - Werkmäßig gedämmte
monotubes pour les réseaux d'eau chaude enterrés Verbundmantelrohrsysteme für direkt erdverlegte
directement - Assemblages d'appareils de robinetterie Fernwärmenetze - Vorgedämmte Absperrarmaturen
manufacturés pour tubes de service en acier, isolation für Stahlmediumrohre mit Polyurethan-
thermique en polyuréthane et tube de protection en Wärmedämmung und Außenmantel aus Polyethylen
polyéthylène
This European Standard was approved by CEN on 12 August 2019.

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 CEN-CENELEC 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 CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 488:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Requirements . 6
5 Testing, test methods and test requirements . 10
6 Marking . 15
7 Installation and maintenance . 16
Annex A (informative) Guidelines for inspection and testing . 17
Annex B (normative) Resistance to axial force and bending moment . 19
Annex C (normative) Resistance to bending forces . 21
Annex D (informative) Waste treatment and recycling . 25
Bibliography . 26
European foreword
This document (EN 488:2019) has been prepared by Technical Committee CEN/TC 107 “Prefabricated
district heating and district cooling pipe system”, 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 April 2020, and conflicting national standards shall be
withdrawn at the latest by April 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 488:2015.
In comparison with the previous edition, the main changes in this new edition of EN 488 are:
— editorial changes to the new structure of standards prepared by the Technical Committee
CEN/TC 107.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Introduction
EN 488 has also been aligned with EN 448 and other relevant European Standards.
Other standards from CEN/TC 107 are:
— EN 253, District heating pipes — Bonded single pipe systems for directly buried hot water networks —
Factory made pipe assembly of steel service pipe, polyurethane thermal insulation and a casing of
polyethylene;
— EN 448, District heating pipes — Bonded single pipe systems for directly buried hot water networks —
Factory made fitting assemblies of steel service pipes, polyurethane thermal insulation and a casing of
polyethylene;
— EN 489-1, District heating pipes — Bonded single and twin pipe systems for buried hot water
networks — Part 1: Joint casing assemblies and thermal insulation for hot water networks in
accordance with EN 13941-1;
— EN 13941-1, District heating pipes — Design and installation of thermal insulated bonded single and
twin pipe systems for directly buried hot water networks — Part 1: Design;
— EN 13941-2, District heating pipes — Design and installation of thermal insulated bonded single and
twin pipe systems for directly buried hot water networks — Part 2: Installation;
— EN 14419, District heating pipes — Bonded single and twin pipe systems for directly buried hot water
networks — Surveillance systems;
— EN 15632 (all parts), District heating pipes — Pre-insulated flexible pipe systems;
— EN 15698-1, District heating pipes — Bonded twin pipe systems for directly buried hot water
networks — Part 1: Factory made twin pipe assembly of steel service pipes, polyurethane thermal
insulation and one casing of polyethylene ;
— EN 15698-2, District heating pipes — Bonded twin pipe systems for directly buried hot water
networks — Part 2: Factory made fitting and valve assemblies of steel service pipes, polyurethane
thermal insulation and one casing of polyethylene
— EN 17248, District heating and district cooling pipe systems — Terms and definitions.
1 Scope
This document specifies requirements and test methods for factory made thermally insulated bonded
valve assemblies for hot water networks in accordance with EN 13941-1, comprising a steel valve, rigid
polyurethane foam thermal insulation and a casing of polyethylene.
The valve assembly could also include the following additional elements: measuring wires, spacers and
diffusion barriers.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, 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, District heating pipes — Bonded single pipe systems for directly buried hot water networks —
Factory made pipe assembly of steel service pipe, polyurethane thermal insulation and a casing of
polyethylene
EN 448, District heating pipes — Bonded single pipe systems for directly buried hot water networks —
Factory made fitting assemblies of steel service pipes, polyurethane thermal insulation and a 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, test procedures and
acceptance criteria — Mandatory requirements
EN 13941-1, District heating pipes — Design and installation of thermal insulated bonded single and twin
pipe systems for directly buried hot water networks — Part 1: Design
EN 13941-2, District heating pipes — Design and installation of thermal insulated bonded single and twin
pipe systems for directly buried hot water networks — Part 2: Installation
EN 14419, District heating pipes — Bonded single and twin pipe systems for directly buried hot water
networks — Surveillance systems
EN 17248, District heating and district cooling pipe systems — Terms and definitions
EN ISO 12944-2, Paints and varnishes — Corrosion protection of steel structures by protective paint
systems — Part 2: Classification of environments (ISO 12944-2)
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, the terms and definitions given in EN 736-1 and EN 17248 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
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 pressure of 1,6 MPa or
2,5 MPa.
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.
4.2 Service temperatures for valves
The valves shall be able to withstand continuous operation with hot water at various temperatures in
accordance with EN 13941-1 and at a minimum water temperature of 4 °C.
4.3 Steel parts
4.3.1 General
Steel grades are specified in EN 13941-1.
All valves, steel pipes and steel components used for manufacturing of valve assemblies under the scope
of this document shall as a minimum be delivered to the manufacturer with an inspection certificate 3.1
according to EN 10204. The inspection certificate shall on request be passed on to the customer.
In case a material related inspection certificate 3.1 according to EN 10204 is required by the customer
who orders the factory made valve assemblies, this information shall be given while placing the order
with the manufacturer of the factory made valve assemblies.
Any later request for provision of such documentation can be too late and can possibly not be met by
the manufacturer, since the manufacturer shall organize the assignment of 3.1 certificates to valves and
valve assemblies before starting the production.
4.3.2 Valve
The valve shall be fully welded. Detachable joints, such as flanged or screwed connections, except
sealing system at the stem, shall not be used in the pressurized area.
4.3.3 Valve extension pipe
The quality of the valve body shall match with the quality of the valve extension pipe.
4.3.4 Welding ends
The welding ends of the valve assembly shall match with the service pipe in accordance with
EN 13941-2.
Pipe ends shall be prepared in accordance with EN 448.
4.3.5 Welding o
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