SIST EN 15698-1:2025

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

This document specifies requirements and test methods for straight lengths of factory made thermally insulated bonded twin pipe assemblies for directly buried hot water networks in accordance with EN 13941-1, comprising two steel service pipes, polyurethane (PUR) foam thermal insulation and a casing of polyethylene.
The twin pipe assembly can also include the following additional elements: Measuring wires, spacers and diffusion barriers.

Fernwärmerohre - Doppelrohr-Verbundsysteme für direkt erdverlegte Fernwärmenetze - Teil 1: Werkmäßig gefertigtes Verbund-Doppelrohrsystem, bestehend aus Stahl-Mediumrohren, einer Wärmedämmung aus Polyurethan und einer Ummantelung aus Polyethylen

Dieses Dokument legt Anforderungen und Prüfverfahren für gerade Abschnitte von werkmäßig gedämmten Doppelverbundrohrbaugruppen für direkt erdverlegte Fernwärmenetzwerke nach EN 13941 1 fest, die aus zwei Stahl-Mediumrohren, einer Schaumstoffwärmedämmung aus Polyurethan (PUR) und einer Ummantelung aus Polyethylen bestehen.
Die Doppelrohrbaugruppe kann darüber hinaus die folgenden zusätzlichen Bauteile umfassen: Messdrähte, Abstandhalter und Diffusionsbarrieren.

Tuyaux de chauffage urbain - Systèmes bloqués de bitubes pré-isolés pour les réseaux d'eau chaude enterrés directement - Partie 1 : Assemblages de bitubes manufacturés pour tube de service en acier, isolation thermique en polyuréthane et tube de protection en polyéthylène

Le présent document définit les exigences et les méthodes d’essais applicables aux longueurs droites d’assemblages de bitubes manufacturés isolés thermiquement pour réseaux d’eau chaude enterrés directement conformément à l’EN 13941-1, comprenant deux tubes de service en acier, une isolation thermique en mousse de polyuréthane (PUR) et une enveloppe en polyéthylène.
L’assemblage de bitubes peut également comprendre les éléments supplémentaires suivants : des câbles de mesure, des entretoises et les barrières anti-diffusion.

Cevi za daljinsko ogrevanje - Poviti dvocevni sistemi za neposredno vkopana vročevodna omrežja - 1. del: Tovarniško izdelan dvocevni sestav iz jeklene cevi, poliuretanske toplotne izolacije in zunanjega polietilenskega plašča

General Information

• Status: Published
• Public Enquiry End Date: 26-Sep-2023
• Publication Date: 08-Apr-2025
• ICS: 23.040.07 - Pipeline and its parts for district heat
• ICS: 23.040.10 - Iron and steel pipes
• ICS: 91.140.10 - Central heating systems
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 08-Apr-2025
• Due Date: 13-Jun-2025
• Completion Date: 09-Apr-2025
• Ref Project: EN 15698-1:2025 - 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

Relations

• Revises: SIST EN 15698-1:2020 - District heating pipes - Bonded twin pipe systems for directly buried hot water networks - Part 1: Factory made twin pipe assembly of steel service pipe, polyurethane thermal insulation and a casing of polyethylene
• Effective Date: 31-May-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2025
Cevi za daljinsko ogrevanje - Poviti dvocevni sistemi za neposredno vkopana
vročevodna omrežja - 1. del: Tovarniško izdelan dvocevni sestav iz jeklene cevi,
poliuretanske toplotne izolacije in zunanjega polietilenskega plašča
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
Fernwärmerohre - Doppelrohr-Verbundsysteme für direkt erdverlegte Fernwärmenetze -
Teil 1: Werkmäßig gefertigtes Verbund-Doppelrohrsystem, bestehend aus Stahl-
Mediumrohren, einer Wärmedämmung aus Polyurethan und einer Ummantelung aus
Polyethylen
Tuyaux de chauffage urbain - Systèmes bloqués de bitubes pré-isolés pour les réseaux
d'eau chaude enterrés directement - Partie 1 : Assemblages de bitubes manufacturés
pour tube de service en acier, isolation thermique en polyuréthane et tube de protection
en polyéthylène
Ta slovenski standard je istoveten z: EN 15698-1:2025
ICS:
23.040.07 Cevovodi za daljinsko Pipeline and its parts for
ogrevanje in njihovi deli district heat
23.040.10 Železne in jeklene cevi Iron and steel pipes
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 15698-1
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2025
EUROPÄISCHE NORM
ICS 23.040.07 Supersedes EN 15698-1:2019
English Version
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
Tuyaux de chauffage urbain - Systèmes bloqués de Fernwärmerohre - Doppelrohr-Verbundsysteme für
bitubes préisolés pour les réseaux d'eau chaude direkt erdverlegte Fernwärmenetze - Teil 1:
enterrés directement - Partie 1: Assemblage de bitubes Werkmäßig gefertigtes Verbund-Doppelrohrsystem,
manufacturés pour tubes de service en acier, isolation bestehend aus Stahl-Mediumrohren, einer
thermique en polyuréthane et tube de protection en Wärmedämmung aus Polyurethan und einer
polyéthylène Ummantelung aus Polyethylen
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 15698-1:2025 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 . 6
4.1 Steel service pipe . 6
4.1.1 Specification . 6
4.1.2 Diameter and wall thickness . 7
4.1.3 Surface condition . 7
4.2 Casing . 7
4.3 Polyurethane foam thermal insulation . 7
4.4 Twin pipe assembly . 7
4.4.1 General . 7
4.4.2 Thermal insulation series . 7
Table 1 — Casing diameters . 8
4.4.3 End alignment of flow and return steel service pipes . 8
4.4.4 Distance between flow and return steel service pipes . 8
Table 2 — Distance between steel service pipes . 9
4.4.5 Twisting of steel service pipes . 9
Figure 1 — Twisting, w, and distance between steel service pipes, L .10
p
4.4.6 Centre line deviation .10
Table 3 — Centre line deviation related to nominal outside diameters .10
4.4.7 Ends of twin pipe assembly .10
4.4.8 Expected thermal life and long-term temperature resistance .11
4.4.9 Axial shear strength .11
4.4.10 Thermal conductivity in unaged condition .11
4.4.11 Impact resistance .11
4.4.12 Surface conditions at delivery .11
4.4.13 Linear water tightness .11
4.4.14 Measuring wires for surveillance systems .11
5 Test methods .11
5.1 General .11
5.2 Test specimens .11
Figure 2 — Areas for test specimens .12
5.3 Polyurethane foam thermal insulation .12
5.4 Twin pipe assembly .12
5.4.1 Axial shear strength .12
Figure 3 — Axial shear test arrangement .13
5.4.2 Expected thermal life and long-term temperature resistance .14
5.4.3 Thermal conductivity in unaged condition . 14
5.4.4 Thermal conductivity at artificially aged condition . 14
5.4.5 Impact resistance . 14
5.4.6 Linear water tightness . 14
6 Marking . 14
Annex A (informative) Guidelines for inspection and testing . 15
A.1 General . 15
A.2 Manufacturer’s type test . 15
A.3 Manufacturer’s quality control . 15
A.4 Additional inspection . 15
Table A.1 — Twin pipe assembly inspection . 16
Annex B (informative) Waste treatment and recycling . 17
Bibliography . 18

European foreword
This document (EN 15698-1:2025) 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 15698-1:2019.
— alignment with the structure of EN 253;
— mistake correction in Table 3;
— in alignment with the other standards of CEN/TC 107, explanatory information has been included in
Annex A.
The EN 15698 series, under the title District heating pipes - Bonded twin pipe systems for directly buried
hot water networks, is currently composed of the following parts:
— Part 1: Factory made twin pipe assembly of steel service pipes, polyurethane thermal insulation and one
casing of polyethylene;
— Part 2: Factory made fitting and valve assemblies of steel service pipes, polyurethane thermal insulation
and one 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, 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 polyethyl
...