EN 488-2:2025

• Abstract:

  This document specifies requirements for factory made thermally insulated bonded steel service valve assemblies for filling, draining, venting and operation purposes for directly buried hot and cold water networks in accordance with EN 13941-1, comprising a steel service valve, steel service pipe, polyurethane (PUR) foam thermal insulation and a casing of polyethylene (PE).; This document applies of steel service valve assemblies with an internal pressure of maximum 2,5 MPa.; The principles of this document can be applied to thermal insulated bonded steel service valve assemblies with internal pressures higher than 2,5 MPa, provided that special attention is paid to the effects of pressure.; The steel service valve assembly can also include the following additional elements: measuring wires, spacers, and diffusion barriers.

• Status: Published
• Publication Date: 18-Mar-2025
• ICS: 23.040.07 - Pipeline and its parts for district heat
• ICS: 23.060.01 - Valves in general
• Technical Committee: CEN/TC 107 - Pre-fabricated district heating pipe systems
• Drafting Committee: CEN/TC 107/WG 5 - Fittings and valves
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 19-Mar-2025
• Due Date: 24-Mar-2025
• Completion Date: 19-Mar-2025
• Ref Project: SIST EN 488-2:2025 - District heating and district cooling pipes - Bonded pipe systems for directly buried hot and cold water networks - Factory made steel valve assembly for draining and venting, polyurethane thermal insulation and a casing of polyethylene

• Refers: EN 13941-1:2019+A1:2021 - District heating pipes - Design and installation of thermal insulated bonded single and twin pipe systems for directly buried hot water networks - Part 1: Design
• Effective Date: 28-Jan-2026
• Refers: EN 19:2023 - Industrial valves - Marking of metallic valves
• Effective Date: 28-Jan-2026
• Refers: EN 1514-6:2003 - Flanges and their joints - Dimensions of gaskets for PN-designated flanges - Part 6: Covered serrated metal gaskets for use with steel flanges
• Effective Date: 28-Jan-2026
• Refers: EN 12266-1:2012 - Industrial valves - Testing of metallic valves - Part 1: Pressure tests, test procedures and acceptance criteria - Mandatory requirements
• Effective Date: 28-Jan-2026
• Refers: EN 736-1:2018 - Valves - Terminology - Part 1: Definition of types of valves
• Effective Date: 28-Jan-2026
• Refers: EN 1515-4:2021 - Flanges and their joints - Bolting - Part 4: Selection of bolting for equipment subject to the Pressure Equipment Directive 2014/68/EU
• Effective Date: 28-Jan-2026
• Refers: EN 1514-8:2004 - Flanges and their joints - Dimensions of gaskets for PN-designated flanges - Part 8: Polymeric O-Ring gaskets for grooved flanges
• Effective Date: 28-Jan-2026
• Refers: EN 253:2019+A1:2023 - 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
• Effective Date: 28-Jan-2026
• Refers: EN 10204:2004 - Metallic products - Types of inspection documents
• Effective Date: 28-Jan-2026
• Refers: EN 1514-1:2024 - Flanges and their joints - Dimensions of gaskets for PN-designated flanges - Part 1: Non-metallic flat gaskets with or without inserts
• Effective Date: 28-Jan-2026
• Refers: EN 1514-4:1997 - Flanges and their joints - Dimensions of gaskets for PN-designated flanges - Part 4: Corrugated, flat or grooved metallic and filled metallic gaskets for use with steel flanges
• Effective Date: 28-Jan-2026
• Refers: EN 1514-3:1997 - Flanges and their joints - Dimensions of gaskets for PN-designated flanges - Part 3: Non-metallic PTFE envelope gaskets
• Effective Date: 28-Jan-2026
• Refers: EN 736-3:2008 - Valves - Terminology - Part 3: Definition of terms
• Effective Date: 28-Jan-2026
• Refers: EN 17248:2019 - District heating and district cooling pipe systems - Terms and definitions
• Effective Date: 28-Jan-2026
• Refers: EN 1514-2:2014+A1:2021 - Flanges and their joints - Gaskets for PN-designated flanges - Part 2: Spiral wound gaskets for use with steel flanges
• Effective Date: 28-Jan-2026

Overview

EN 488-2:2025 is a CEN European standard for factory made thermally insulated bonded steel service valve assemblies used in directly buried district heating and district cooling networks. It covers assemblies intended for filling, draining, venting and operational access of hot and cold water distribution systems. The assemblies combine a steel service valve and pipe, polyurethane (PUR) foam thermal insulation, and a polyethylene (PE) casing and are designed in accordance with EN 13941-1. EN 488-2:2025 applies to assemblies with an internal pressure up to 2.5 MPa, with principles extendable to higher pressures when pressure effects are addressed.

Key topics and requirements

• Scope and components: Defines requirements for steel valves, steel extension pipes, PUR insulation and PE casing as factory-made bonded assemblies. Optional elements include measuring wires, spacers and diffusion barriers.
• Pressure and service limits: Applies to internal pressures ≤ 2.5 MPa; notes special considerations for higher-pressure designs.
• Materials and welding: Requirements for metallic parts, specification of steel valve bodies, welding of steel parts and welding of PE casings.
• Sealing and leak-tightness: Criteria for sealing components, leak-tightness of the casing and shrink/seal interfaces.
• Thermal performance: Expectations for thermal insulation quality, thermal conductivity, long-term temperature resistance and expected thermal life of PUR foam.
• Inspection and testing: References inspection and testing procedures (see Annex A) and mandates manufacturer information on tightness and service life.
• Marking and documentation: Requirements for marking valves, casings and assemblies in line with referenced standards (for traceability and installation guidance).
• Installation, operation, maintenance: Guidance on installation, operation and maintenance responsibilities to ensure reliable performance in buried networks.

Applications and who uses it

EN 488-2:2025 is intended for:

• District heating and district cooling utilities and network operators specifying bonded pipe systems
• Pipe and valve manufacturers producing factory-made service valve assemblies
• Design and installation engineers working on directly buried hot and cold water networks
• Contractors, installers and maintenance teams responsible for filling, draining and venting operations
• Inspectors, certifiers and asset owners assessing conformity, lifecycle and recyclability

Common applications include service connections, filling/bleeding points and maintenance access in bonded single and twin pipe systems for urban heating and chilled-water networks.

Related standards

Key related references for specification and installation:

• EN 13941-1 (design for bonded pipe systems)
• EN 488-1 (steel shut-off valve assemblies)
• EN 253, EN 14419, EN 17248, EN 12266-1, EN 16668 and EN 15698 series

Keywords: EN 488-2:2025, district heating, district cooling, bonded pipe systems, steel service valve, polyurethane insulation, polyethylene casing, buried networks.

SLOVENSKI STANDARD
01-junij-2025
Cevi za daljinsko ogrevanje in daljinsko hlajenje - Poviti cevni sistemi za
neposredno vkopana omrežja za toplo in hladno vodo - Tovarniško izdelan sestav
jeklenih ventilov za izsuševanje in odzračevanje, obdan s poliuretansko toplotno
izolacijo in zaščitnim plaščem iz polietilena
District heating and district cooling pipes - Bonded pipe systems for directly buried hot
and cold water networks - Factory made steel valve assembly for draining and venting,
polyurethane thermal insulation and a casing of polyethylene
Fernwärmerohre - Rohr-Verbundsysteme für erdverlegte Fernwärme- und
Fernkältenetze - Teil 2: Werkmäßig gefertigte Baueinheiten für Entleerungs- und
Entlüftungsarmaturen bestehend aus Stahl, einer Wärmedämmung aus Polyurethan und
einer Ummantelung aus Polyethylen
Tuyaux de chauffage urbain et réseaux d'eau glacée - Systèmes bloqués de tuyaux
préisolés pour les réseaux d'eau chaude et froide enterrés directement - Partie 2 :
Assemblages d'appareils de robinetterie en acier manufacturés pour vidanges et purges,
isolation thermique en polyuréthane et enveloppe en polyéthylène
Ta slovenski standard je istoveten z: EN 488-2:2025
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 488-2
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2025
EUROPÄISCHE NORM
ICS 23.040.07
English Version
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
Tuyaux de chauffage urbain et réseaux d'eau glacée - Fernwärme- und Fernkälterohre - Rohr-
Systèmes bloqués de tuyaux préisolés pour les réseaux Verbundsysteme für erdverlegte Fernwärme- und
d'eau chaude et froide enterrés directement - Partie 2 : Fernkältenetze - Teil 2: Werkmäßig gefertigte
Assemblage d'appareils de robinetterie de service en Baueinheiten für Wartungsarmaturen aus Stahl für
acier manufacturés pour tubes de service en acier, Stahlmediumrohre, einer Wärmedämmung aus
isolation thermique en polyuréthane et enveloppe en Polyurethan und einer Ummantelung aus Polyethylen
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 488-2:2025 E
worldwide for CEN national Members.

Contents Page
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Requirements . 6
4.1 General . 6
4.2 Steel valves . 7
4.2.1 Pressure ratings for valves . 7
4.2.2 Service temperatures for valves . 7
4.3 Metallic parts . 7
4.3.1 Specification . 7
4.3.2 Steel valve . 7
4.3.3 Valve extension pipe . 8
4.3.4 Surface conditions . 8
4.3.5 Accessory. 8
4.3.6 Welding of steel parts . 8
4.4 Casing . 8
4.4.1 General . 8
4.4.2 Welding of polyethylene . 8
4.5 Sealing component . 8
4.6 Polyurethane (PUR) foam thermal insulation . 9
4.7 Steel service valve assembly . 9
4.7.1 General . 9
4.7.2 End of service valve assembly . 9
4.7.3 Metallic parts out of the casing . 9
4.7.4 Leak-tightness of the casing . 9
4.7.5 Thermal insulation series .10
4.7.6 Main dimensions of the service valve assembly .10
4.8 Expected thermal life and long-term temperature resistance .10
4.9 Thermal conductivity .10
4.10 Surface conditions at delivery .10
4.11 Measuring wires for surveillance systems .10
4.12 Installation, operation, and maintenance .10
4.12.1 Installation .10
4.12.2 Operation .10
4.12.3 Maintenance .10
5 Marking .11
5.1 General .11
5.2 Steel valve .11
5.3 Casing .11
5.4 Steel service valve assembly .11
Annex A (informative) Inspection and testing .12
Annex B (informative) Waste treatment and recycling .13
Bibliography .14
European foreword
This document (EN 488-2:2025) 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 month year of DOP, and conflicting national standards
shall be withdrawn at the latest by month year of DOW.
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.
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;
— EN 488-2, District heating pipes – Bonded single pipe systems for directly buried hot water networks –
Part 2: Factory made steel service valve assembly for steel service pipes, polyurethane thermal
insulation and a casing of polyethylene (this document).
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, 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 the United
Kingdom.
Introduction
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 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;
— 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 buried hot water networks
— Surveillance systems
— EN 15632 (all parts), District heating pipes — Factory made 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
— EN 17414 (all parts), District cooling pipes — Factory made flexible pipe systems
— EN 17415 (all parts), District cooling pipes — Bonded single pipe systems for directly buried cold water
networks
— EN 17878 (all parts), District heating pipes — Factory made flexible pipe systems with a lower
temperature profile
Waste management and recycling of materials is dealt with in Annex B.
1 Scope
This document specifies requirements for factory made thermally insulated bonded steel service valve
assemblies for filling, draining, venting and operation purposes for directly buried hot and cold water
networks in accordance with EN 13941-1, comprising a steel service valve, steel service pipe,
polyurethane (PUR) foam thermal insulation and a casing of polyethylene (PE).
This document applies of steel service valve assemblies with an internal pressure of maximum 2,5 MPa.
The principles of this document can be applied to thermal insulated bonded steel service valve assemblies
with internal pressures higher than 2,5 MPa, provided that special attention is paid to the effects of
pressure.
The steel service valve assembly can also include the following additional elements: measuring wires,
spacers, and diffusion barriers.
2 Normative references
The following doc
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