SIST EN 253:2019+A1:2024

SLOVENSKI STANDARD
01-maj-2024
Cevi za daljinsko ogrevanje - Poviti enocevni sistemi za neposredno vkopana
vročevodna omrežja - Tovarniško izdelan cevni sestav iz jeklene delovne cevi,
obdane s poliuretansko toplotno izolacijo in zaščitnim plaščem iz polietilena
(vključno z dopolnilom A1)
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
Fernwärmerohre - Einzelrohr-Verbundsysteme für direkt erdverlegte Fernwärmenetze -
Werkmäßig gefertigte Verbundrohrsysteme, bestehend aus Stahl-Mediumrohr, einer
Wärmedämmung aus Polyurethan und einer Ummantelung aus Polyethylen
Tuyaux de chauffage urbain - Systèmes bloqués de tuyaux pour les réseaux d'eau
chaude enterrées directement - Assemblages de tubes de service en acier
manufacturés, isolation thermique en polyuréthane et tube de protection en polyéthylène
Ta slovenski standard je istoveten z: EN 253:2019+A1:2023
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
91.140.65 Oprema za ogrevanje vode Water heating equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 253:2019+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2023
EUROPÄISCHE NORM
ICS 23.040.07; 23.040.10 Supersedes EN 253:2019
English Version
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
Tuyaux de chauffage urbain - Systèmes bloqués de Fernwärmerohre - Einzelrohr-Verbundsysteme für
tuyaux pour les réseaux d'eau chaude enterrées direkt erdverlegte Fernwärmenetze - Werkmäßig
directement - Assemblages de tubes de service en acier gefertigte Verbundrohrsysteme, bestehend aus Stahl-
manufacturés, isolation thermique en polyuréthane et Mediumrohr, einer Wärmedämmung aus Polyurethan
tube de protection en polyéthylène und einer Ummantelung aus Polyethylen
This European Standard was approved by CEN on 26 August 2019 and includes Amendment approved by CEN on 1 October
2023.
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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 253:2019+A1:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Requirements . 7
4.1 General . 7
4.2 Steel service pipe . 8
4.2.1 Specification . 8
4.2.2 Diameter . 8
4.2.3 Wall thickness . 8
4.2.4 Surface condition . 9
4.2.5 !Pipe ends . 9
4.3 Casing. 10
4.3.1 Material properties . 10
4.3.2 Casing properties . 10
4.4 Polyurethane (PUR) foam thermal insulation . 12
4.4.1 Composition . 12
4.4.2 Cell structure . 12
4.4.3 Compressive strength . 12
4.4.4 Foam density . 13
4.4.5 Water absorption at elevated temperature . 13
4.5 Pipe assembly . 13
4.5.1 General . 13
4.5.2 Thermal insulation series . 13
4.5.3 Pipe ends without thermal insulation . 14
4.5.4 Diameter and wall thickness of the casing . 14
4.5.5 Centre line deviation . 15
4.5.6 Expected thermal life and long term temperature resistance . 15
4.5.7 Thermal conductivity in unaged condition. 16
4.5.8 Thermal conductivity at artificially aged condition . 16
4.5.9 Impact resistance . 16
4.5.10 Surface conditions at delivery . 16
4.5.11 Measuring wires for surveillance systems . 17
4.5.12 Linear water tightness . 17
5 Test methods . 17
5.1 General conditions and test specimens . 17
5.1.1 General conditions . 17
5.1.2 Test specimens . 17
5.2 Casing. 18
5.2.1 Appearance and surface finish . 18
5.2.2 Elongation at break . 18
5.2.3 Carbon black dispersion, homogeneity . 19
5.2.4 Stress crack resistance test . 19
5.3 Polyurethane (PUR) foam thermal insulation . 20
5.3.1 Composition . 20
5.3.2 Cell structure . 20
5.3.3 Compressive strength . 21
5.3.4 Foam density . 21
5.3.5 Water absorption . 21
5.4 Pipe assembly . 22
5.4.1 Axial shear strength . 22
5.4.2 Shear strength of the pipe assembly after ageing . 24
5.4.3 Thermal conductivity in unaged condition . 24
5.4.4 Thermal conductivity at artificially aged condition . 25
5.4.5 Impact resistance. 25
5.4.6 Linear water tightness . 25
6 Marking . 27
6.1 General . 27
6.2 Steel service pipe . 28
6.3 Casing . 28
6.4 Pipe assembly . 28
Annex A (informative)  Relation between actual continuous operating conditions and
accelerated ageing test conditions . 29
Annex B (info
...