EN 488-1:2025
(Main)District heating pipes - Bonded single pipe systems for directly buried hot water networks - Part 1: Factory made steel shut-off valve assembly for steel service pipes, polyurethane thermal insulation and a casing of polyethylene
District heating pipes - Bonded single pipe systems for directly buried hot water networks - Part 1: Factory made steel shut-off valve assembly for steel service pipes, polyurethane thermal insulation and a casing of polyethylene
This document specifies requirements and test methods for factory made thermally insulated bonded steel shut-off valve assemblies for hot water networks in accordance with EN 13941-1, comprising a steel valve, valve extension pipes, polyurethane (PUR) foam thermal insulation and a casing of polyethylene.
This document applies to steel valve assemblies with an internal pressure of maximum 2,5 MPa.
The principles of this document can be applied to thermal insulated bonded steel valve assemblies with internal pressures higher than 2,5 MPa, provided that special attention is paid to the effects of pressure.
The steel shut-off valve assembly can also include the following additional elements: measuring wires, spacers and diffusion barriers.
Fernwärmerohre - Einrohr-Verbundsysteme für direkt erdverlegte Fernwärmenetze - Teil 1: Werkmäßig gefertigte Stahlabsperrarmaturenbaueinheit für Stahl-Mediumrohre, Wärmedämmung aus Polyurethan und einer Ummantelung aus Polyethylen
Dieses Dokument legt die Anforderungen und Prüfverfahren für werkmäßig gefertigte, wärmegedämmte Stahl-Absperrarmaturenbaugruppen für Fernwärmenetze in Übereinstimmung mit EN 13941 1 fest, die aus einer Stahl-Armatur, Armatur-Verlängerungsrohren, einer Wärmedämmung aus Polyurethan-Schaum (PUR) und einer Ummantelung aus Polyethylen bestehen.
Dieses Dokument gilt für Stahl-Armaturenbaugruppen mit einem Innendruck von höchstens 2,5 MPa.
Die in diesem Dokument dargelegten Grundsätze können auf wärmegedämmte Verbund-Stahl-Armaturen-baugruppen mit einem Innendruck von mehr als 2,5 MPa angewendet werden, sofern den Auswirkungen des Drucks besondere Aufmerksamkeit geschenkt wird.
Die Stahl-Absperrarmaturenbaugruppe kann darüber hinaus die folgenden zusätzlichen Bauteile umfassen: Messdrähte, Abstandhalter und Diffusionsbarrieren.
Tuyaux de chauffage urbain - Systèmes bloqués monotubes pour les réseaux d'eau chaude enterrés directement - Partie 1 : Assemblage d'appareils de robinetterie d'arrêt en acier manufacturés pour tubes de service en acier, isolation thermique en polyuréthane et enveloppe en polyéthylène
Le présent document définit les exigences et les méthodes d’essais applicables aux assemblages d’appareils de robinetterie d'arrêt en acier manufacturés bloqués isolés thermiquement pour les réseaux d’eau chaude conformément à l’EN 13941-1, comprenant un appareil de robinetterie en acier, des tubes d’extension, une isolation thermique en mousse de polyuréthane (PUR) et une enveloppe en polyéthylène.
Le présent document s'applique aux assemblages d'appareils de robinetterie en acier avec une pression interne maximale de 2,5 MPa.
Les principes du présent document peuvent s'appliquer aux assemblages d'appareils de robinetterie en acier bloqués isolés thermiquement avec des pressions internes supérieures à 2,5 MPa, à condition qu'une attention particulière soit accordée aux effets de la pression.
L’assemblage d’appareils de robinetterie d'arrêt en acier peut également comprendre les éléments supplémentaires suivants : câbles de mesure, entretoises et barrières anti-diffusion.
Cevi za daljinsko ogrevanje - Poviti enocevni sistemi za neposredno vkopana vročevodna omrežja - 1. del: Tovarniško izdelan sestav jeklenih ventilov za jeklene delovne cevi, obdane s poliuretansko toplotno izolacijo in zaščitnim plaščem iz polietilena
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2025
Cevi za daljinsko ogrevanje - Poviti enocevni sistemi za neposredno vkopana
vročevodna omrežja - 1. del: 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
- Part 1: Factory made steel valve assembly for steel service pipes, polyurethane thermal
insulation and a casing of polyethylene
Fernwärmerohre - Einrohr-Verbundsysteme für direkt erdverlegte Fernwärmenetze - Teil
1: Werkmäßig gefertigte Stahlarmaturenbaueinheit für Stahl-Mediumrohre,
Wärmedämmung aus Polyurethan und einer Ummantelung aus Polyethylen
Tuyaux de chauffage urbain - Systèmes bloqués monotubes pour les réseaux d'eau
chaude enterrés directement - Partie 1 : Assemblages d'appareils de robinetterie en
acier manufacturés pour tubes de service en acier, isolation thermique en polyuréthane
et enveloppe en polyéthylène
Ta slovenski standard je istoveten z: EN 488-1:2025
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 488-1
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2025
EUROPÄISCHE NORM
ICS 23.060.01; 23.040.07 Supersedes EN 488:2019
English Version
District heating pipes - Bonded single pipe systems for
directly buried hot water networks - Part 1: Factory made
steel shut-off valve assembly for steel service pipes,
polyurethane thermal insulation and a casing of
polyethylene
Tuyaux de chauffage urbain - Systèmes bloqués Fernwärmerohre - Einrohr-Verbundsysteme für direkt
monotubes pour les réseaux d'eau chaude enterrés erdverlegte Fernwärmenetze - Teil 1: Werkmäßig
directement - Partie 1 : Assemblage d'appareils de gefertigte Stahlabsperrarmaturenbaueinheit für Stahl-
robinetterie d'arrêt en acier manufacturés pour tubes Mediumrohre, Wärmedämmung aus Polyurethan und
de service en acier, isolation thermique en einer Ummantelung aus Polyethylen
polyuréthane et enveloppe en polyéthylène
This European Standard was approved by CEN on 27 January 2025.
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, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 488-1:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Requirements . 7
4.1 General . 7
4.2 Pressure ratings for valves . 7
4.2.1 General . 7
4.2.2 Valves without indicated flow direction . 7
4.3 Service temperatures for valves . 7
4.4 Steel parts . 7
4.4.1 Specification . 7
4.4.2 Valve. 7
4.4.3 Valve extension pipes . 8
4.4.4 Surface condition . 8
4.4.5 Welding of steel parts . 8
4.5 Casing . 8
4.6 Polyurethane foam thermal insulation . 8
4.6.1 General . 8
4.6.2 Minimum thickness of thermal insulation . 8
4.7 Valve assembly . 8
4.7.1 General . 8
4.7.2 Thermal insulation series . 8
4.7.3 Ends of valve assembly . 8
4.7.4 Polyethylene welding . 9
4.7.5 End of stem construction . 9
4.7.6 Tolerances of main dimensions .10
4.7.7 Expected thermal life and long term temperature resistance .10
4.7.8 Thermal conductivity .10
4.7.9 Surface conditions at delivery .10
4.7.10 Measuring wires for surveillance systems .10
4.8 Installation, operation and maintenance .10
4.8.1 Installation .10
4.8.2 Operation .10
4.8.3 Maintenance .11
4.9 Resistance to axial forces and bending moments.11
5 Test methods .11
5.1 General conditions and test specimens .11
5.2 Test specimens .11
5.2.1 Type testing of steel parts of the valve .11
5.2.2 Test specimens from casings and polyurethane foam thermal insulation .12
5.3 Steel parts .12
5.3.1 Type test of the steel parts .12
5.3.2 Production testing of valves .15
6 Marking . 16
6.1 General . 16
6.2 Valve . 16
6.3 Valve extension pipes. 16
6.4 Casing . 16
6.5 Valve assembly . 16
Annex A (informative) Guidelines for inspection and testing . 18
Annex B (normative) Resistance to axial force and bending moment . 20
Annex C (normative) Resistance to bending forces . 22
Annex D (informative) Waste treatment and recycling . 27
Bibliography . 28
European foreword
This document (EN 488-1:2025) has been prepared by Technical Committee CEN/TC 107 “District
heating and cooling 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 September 2025, and conflicting national standards shall
be withdrawn at the latest by September 2025.
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 488:2019.
— alignment with the structure of EN 253;
— the valves shall be designed for an operating pressure of 2,5 MPa in accordance with 4.2.1;
— the requirements for the valve extension pipes are specified in 4.4.3;
— for the leak-tightness of the seat of the unloaded steel valves up to DN 400, a distinction is no longer
made between different leakage rates, see 5.3.1.3;
— added requirement: Before measuring the torque, the valve shall be closed for 24 h, see 5.3.1.4;
— when marking the valve assemblies, information about the diffusion barrier is also to be provided,
see 6.5.
The EN 488 series is currently composed of the following parts:
— EN 488-1, District heating pipes – Bonded single pipe systems for directly buried hot water networks –
Part 1: Factory made steel shut-off valve assembly for steel service pipes, polyurethane thermal
insulation and a casing of polyethylene (this document);
— EN 488-2, District heating and district cooling pipes – Bonded pipe systems for directly buried hot and
cold water networks – Part 2: Factory made steel service valve assembly for steel service pipes,
polyurethane thermal insulation and a casing of polyethylene.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, Denma
...
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