SIST EN 253:2009+A2:2015

District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene

This European Standard specifies requirements and test methods for straight lengths of prefabricated thermally insulated pipe-in-pipe assemblies for directly buried hot water networks, comprising a steel service pipe from DN 15 to DN 1200, rigid polyurethane foam insulation and an outer casing of polyethylene. The pipe assembly may also include the following additional elements: measuring wires, spacers and diffusion barriers.
This standard applies only to insulated pipe assemblies, for continuous operation with hot water at various temperatures up to 120 °C and occasionally with a peak temperature up to 140 °C.
The estimation of expected thermal life with continuous operation at various temperatures is outlined in Annex B.

Fernwärmerohre - Werkmäßig gedämmte Verbundmantelrohrsysteme für direkt erdverlegte Fernwärmenetze - Verbund-Rohrsystem, bestehend aus Stahl-Mediumrohr, Polyurethan-Wärmedämmung und Außenmantel aus Polyethylen

Diese Europäische Norm legt Anforderungen und Prüfverfahren für vorgefertigte, gerade wärmegedämmte Rohr in Rohr Systeme für direkt erdverlegte Fernwärmenetze fest, die aus einem Stahl-Mediumrohr von DN 15 bis DN 1200 mit Wärmedämmung aus Polyurethan Hartschaumstoff und einer Ummantelung aus Polyethylen bestehen. Das Verbund Rohrsystem darf darüber hinaus folgende Bauteile umfassen: Mess¬drähte, Abstandshalter und Diffusionsbarrieren.
Diese Norm gilt nur für wärmegedämmte Verbund Rohrsysteme für den Dauerbetrieb mit Warmwasser bei unterschiedlichen Betriebstemperaturen von bis zu 120 °C und gelegentlich auftretenden Spitzen¬temperaturen von bis zu 140 °C.
Die Abschätzung der erwarteten thermischen Lebensdauer bei Dauerbetrieb mit unterschiedlichen Betriebs-temperaturen ist in Anhang B erläutert.

Tuyaux de chauffage urbain - Systèmes bloqués de tuyaux préisolés pour les réseaux d'eau chaude enterrés directement - Tube de service en acier, isolation thermique en polyuréthane et tube de protection en polyéthylène

La présente Norme européenne définit les prescriptions et les méthodes d’essai applicables aux longueurs droites de systèmes préfabriqués de tuyaux isolés thermiquement pour réseaux d’eau chaude enterrés directement comprenant un tube de service en acier de DN 15 à DN 1200, une isolation en mousse rigide de polyuréthane et un tube de protection en polyéthylène. Le tuyau préisolé peut également comprendre les éléments supplémentaires suivants : les câbles de mesure, les entretoises et les barrières anti diffusion.
La présente Norme s’applique uniquement aux systèmes isolés par mousse de polyuréthane utilisés pour l’eau chaude à différentes températures pouvant aller en service continu jusqu'à 120 °C et, parfois, à une température de pointe pouvant atteindre 140 °C.
L’estimation de la durée de vie thermique escomptée de systèmes opérant à différentes températures en service continu est donnée à l’Annexe B.

Cevi za daljinsko ogrevanje - Izolirani vezani cevni sistemi za podzemeljska toplovodna omrežja - Cevni sestav iz jeklene cevi, poliuretanske toplotne izolacije in zunanjega polietilenskega plašča

Ta evropski standard določa zahteve in preskusne metode za ravne odseke predizdelanih toplotno izoliranih cevnih sestavov za podzemeljska toplovodna omrežja, sestavljene iz jeklene cevi velikosti od DN 15 do DN 1200, izolacije iz trdne poliuretanske pene in zunanjega polietilenskega plašča. Cevni sestav lahko vključuje tudi naslednje dodatne elemente: merilne žice, distančnike in difuzijske pregrade.
Ta standard se uporablja samo za izolirane cevne sestave za neprekinjeno delovanje s toplo vodo pri različnih temperaturah do 120 °C, včasih pa tudi z najvišjo temperaturo do 140 °C.
Ocena pričakovane življenjske dobe pri neprekinjenem delovanju pri različnih temperaturah je navedena v dodatku B.

General Information

• Status: Withdrawn
• Publication Date: 04-Nov-2015
• Withdrawal Date: 27-Oct-2019
• ICS: 23.040.07 - Pipeline and its parts for district heat
• ICS: 23.040.10 - Iron and steel pipes
• ICS: 91.140.65 - Water heating equipment
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 9900 - Withdrawal (Adopted Project)
• Start Date: 28-Oct-2019
• Due Date: 20-Nov-2019
• Completion Date: 28-Oct-2019
• Ref Project: EN 253:2009+A2:2015 - District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene

Relations

• Replaced By: SIST EN 253:2020 - 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: 23-Oct-2019
• Consolidates: SIST EN 253:2009+A1:2014 - District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene
• Effective Date: 01-Dec-2015
• Consolidates: SIST EN 253:2009+A1:2014/kprA2:2015 - District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene
• Effective Date: 01-Dec-2015
• Replaced By: SIST EN 253:2020 - 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: 08-Jun-2022
• Consolidates: SIST EN 253:2009+A1:2014 - District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene
• Effective Date: 18-Jan-2023
• Consolidates: SIST EN 253:2009+A1:2014/kprA2:2015 - District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene
• Effective Date: 18-Jan-2023
• Revised: SIST EN 253:2020 - 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: 14-Jun-2017
• Consolidates: SIST EN 253:2009+A1:2014 - District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene
• Effective Date: 19-Jan-2023
• Consolidates: SIST EN 253:2009+A1:2014/kprA2:2015 - District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene
• Effective Date: 19-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 253:2009+A2:2015
01-december-2015
&HYL]DGDOMLQVNRRJUHYDQMH,]ROLUDQLYH]DQLFHYQLVLVWHPL]DSRG]HPHOMVND
WRSORYRGQDRPUHåMD&HYQLVHVWDYL]MHNOHQHFHYLSROLXUHWDQVNHWRSORWQHL]RODFLMH
LQ]XQDQMHJDSROLHWLOHQVNHJDSODãþD
District heating pipes - Preinsulated bonded pipe systems for directly buried hot water
networks - Pipe assembly of steel service pipe, polyurethane thermal insulation and
outer casing of polyethylene
Fernwärmerohre - Werkmäßig gedämmte Verbundmantelrohrsysteme für direkt
erdverlegte Fernwärmenetze - Verbund-Rohrsystem, bestehend aus Stahl-Mediumrohr,
Polyurethan-Wärmedämmung und Außenmantel aus Polyethylen
Tuyaux de chauffage urbain - Systèmes bloqués de tuyaux préisolés pour les réseaux
d'eau chaude enterrés directement - Tube de service en acier, isolation thermique en
polyuréthane et tube de protection en polyéthylène
Ta slovenski standard je istoveten z: EN 253:2009+A2:2015
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
SIST EN 253:2009+A2:2015 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 253:2009+A2:2015

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SIST EN 253:2009+A2:2015


EN 253:2009+A2
EUROPEAN STANDARD

NORME EUROPÉENNE

October 2015
EUROPÄISCHE NORM
ICS 23.040.10 Supersedes EN 253:2009+A1:2013
English Version

District heating pipes - Preinsulated bonded pipe systems
for directly buried hot water networks - Pipe assembly of
steel service pipe, polyurethane thermal insulation and
outer casing of polyethylene
Tuyaux de chauffage urbain - Systèmes bloqués de Fernwärmerohre - Werkmäßig gedämmte
tuyaux préisolés pour les réseaux d'eau chaude Verbundmantelrohrsysteme für direkt erdverlegte
enterrés directement - Tube de service en acier, Fernwärmenetze - Verbund-Rohrsystem, bestehend
isolation thermique en polyuréthane et tube de aus Stahl-Mediumrohr, Polyurethan-Wärmedämmung
protection en polyéthylène und Außenmantel aus Polyethylen
This European Standard was approved by CEN on 14 December 2012 and includes Amendment 2 approved by CEN on 17 July
2015.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 253:2009+A2:2015 E
worldwide for CEN national Members.

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SIST EN 253:2009+A2:2015
EN 253:2009+A2:2015 (E)
Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Requirements . 10
4.1 General . 10
4.2 Steel service pipe . 11
4.2.1 Specification . 11
4.2.2 Diameter . 11
4.2.3 Wall thickness . 12
4.2.4 Surface condition . 13
4.3 Casing. 14
4.3.1 Material properties . 14
4.3.2 Casing properties . 14
4.4 Polyurethane rigid foam insulation (PUR) . 16
4.4.1 Composition . 16
4.4.2 Cell structure . 16
4.4.3 Compressive strength . 16
4.4.4 Foam density . 16
4.4.5 Water absorption at elevated temperature . 16
4.5 Pipe assembly . 17
4.5.1 General . 17
4.5.2 Pipe ends . 17
4.5.3 Diameter and wall thickness of the casing . 17
4.5.4 Centre line deviation . 18
4.5.5 Expected thermal life and long term temperature resistance . 18
4.5.6 Thermal conductivity in unaged condition. 18
4.5.7 Thermal conductivity at artificially aged condition . 19
4.5.8 Impact resistance . 19
4.5.9 Long term creep resistance and modulus . 19
4.5.10 Surface conditions at delivery . 19
4.5.11 Measuring wires for surveillance systems . 19
5 Test methods . 19
5.1 General conditions and test specimens . 19
5.1.1 General conditions . 19
5.1.2 Test specimens . 19
5.2 Casing. 20
5.2.1 Appearance and surface finish . 20
5.2.2 Elongation at break . 20
5.2.3 Carbon black dispersion, homogeneity . 21
5.2.4 Stress crack resistance test . 21
5.3 Polyurethane rigid foam insulation (PUR) . 22
5.3.1 Composition . 22
5.3.2 Cell structure . 22
2

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SIST EN 253:2009+A2:2015
EN 253:2009+A2:2015 (E)
5.3.3 Compressive strength . 22
5.3.4 5.3.4 Foam density . 23
5.3.5 5.3.5 Water absorption . 23
5.4 Pipe assembly . 23
5.4.1 Axial shear strength . 23
5.4.2 Tangential shear strength . 25
5.4.3 Shear strength of the pipe assembly after ageing . 27
5.4.4 Thermal conductivity in unaged condition . 27
5.4.5 Thermal conductivity at artificially aged condition . 27
5.4.6 Impact resistance. 27
5.4.7 Long term creep resistance and modulus at 140 °C . 27
6 Marking . 30
6.1 General . 30
6.2 Steel service pipe . 30
6.3 Casing . 30
6.4 Pipe assembly . 31
Annex A (informative)  Relation between actual continuous operating conditions and
accelerated ageing test conditions . 32
Annex B (informative)  Calculation of the minimum expected thermal life with operation at
various temperatures with respect to PUR foam performance . 34
Annex C (normative)  !Calculated Continuous Operating Temperature (CCOT)". 35
C.1 General . 35
C.2 Principle . 35
C.3 Symbols . 35
C.4 Ageing and shear strength determinations . 36
C.5 Calculations . 36
C.5.1 Determination of the thermal life at different ageing temperatures . 36
C.5.2 Adoption to the Arrhenius relation. 36
C.5.3 Calculated continuous operating temperature, CCOT . 37
Annex D (informative) Guidelines for inspection and testing . 38
D.1 General . 38
D.2 Manufacturer's type test . 38
D.3 Manufacturer’s quality control . 38
D.4 External inspection . 38
D.5 Manufacturer's responsibility . 38
Annex E (informative) Radial creep behaviour of the polyurethane foam (PUR) . 42
Annex F (normative)  Thermal conductivity of pre-insulated pipes - Test procedure . 43
F.1 Scope . 43
F.2 Requirements (EN ISO 8497:1996, Clause 5) . 43
F.2.1 Test specimen (EN ISO 8497:1996, 5.1) . 43
F.2.2 Operating temperature (EN ISO 8497:1996, 5.2) . 43
F.2.3 Types of apparatus (EN ISO 8497:1996, 5.5) . 43
3

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SIST EN 253:2009+A2:2015
EN 253:2009+A2:2015 (E)
F.3 Apparatus (EN ISO 8497:1996, Clause 7) . 43
F.3.1 Guarded end apparatus . 43
F.3.2 Calibrated end apparatus . 43
F.3.3 Dimensions (EN ISO 8497:1996, 7.2) . 44
F.3.4 Heater pipe surface temperature . 44
F.4 Test specimens (EN ISO 8497:1996, Clause 8). 44
F.4.1 Conditioning (EN ISO 8497:1996, 8.4) . 44
F.4.2 Dimension measurement (EN ISO 8497:1996, 8.5) . 44
F.4.3 Surface temperature measurement . 44
F.4.4 Location of temperature sensors (EN ISO 8497:1996, 8.6) . 44
F.5 Procedure (EN ISO 8497:1996, Clause 9) . 44
F.5.1 Test length (EN ISO 8497:1996, 9.1.1) . 44
F.5.2 Diameter (EN ISO 8497:1996, 8.5) . 44
F.5.3 Thickness of casing . 44
F.5.4 Ambient requirements (EN ISO 8497:1996, 9.2) . 45
F.5.5 Test pipe temperature (EN ISO 8497:1996, 9.3) . 45
F.5.6 Power supply (EN ISO 8497:1996, 7.9) . 45
F.5.7 #Axial heat loss$ . 45
F.5.8 Test period and stability (EN ISO 8497:1996, 9.5.3) . 45
F.6 Calculations (EN ISO 8497:1996, Clause 11). 45
F.6.1 Thermal conductivity (EN ISO 8497:1996, 3.5) . 45
F.7 Symbols and units (EN ISO 8497:1996 Clause 4) . 46
Annex G (informative) National A-deviations . 48
G.1 Swedish national legislative deviations on steel service pipes . 48
Annex H (informative) Main changes from the previous edition of EN 253 . 49
Annex I (informative) Waste treatment and recycling . 52
Bibliography . 53


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SIST EN 253:2009+A2:2015
EN 253:2009+A2:2015 (E)
European foreword
This document (EN 253:2009+A2:2015) has been prepared by Technical Committee CEN/TC 107
“Prefabricated district heating pipe 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 April 2016, and conflicting national standards shall be withdrawn at
the latest by April 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document includes Amendment 1, approved by CEN on 2012-12-14, and Amendment 2, approved by
CEN on 2015-07-17.
The start and finish of text introduced or altered by amendment is indicated in the text by tags !" and
#$.
This document supersedes #EN 253:2009+A1:2013$.
Annex H provides details of significant technical changes between this European Standard and the previous
editions.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
5

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SIST EN 253:2009+A2:2015
EN 253:2009+A2:2015 (E)
Introduction
This specification is part of the standards for bonded systems using polyurethane foam thermal insulation
applied to bond to a steel service pipe and a polyethylene casing.
The other standards from CEN/TC 107 covering this subject are:
EN 448, District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks –
Fitting assemblies of steel service pipes, polyurethane thermal insulation and outer casing of polyethylene;
EN 488, District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks –
Steel valve assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene;
EN 489, District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Joint
assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene;
EN 13941, Design and installation of preinsulated bonded pipe systems for district heating;
EN 14419, District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks –
Surveillance systems;
EN 15698-1, District heating pipes – Preinsulated bonded twin pipe systems for directly buried hot water
networks – Part 1: Twin pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of
polyethylene
6

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SIST EN 253:2009+A2:2015
EN 253:2009+A2:2015 (E)
1 Scope
This European Standard specifies requirements and test methods for straight lengths of prefabricated
thermally insulated pipe-in-pipe assemblies for directly buried hot water networks, comprising a steel
service pipe from DN 15 to DN 1200, rigid polyurethane foam insulation and an outer casing of polyethylene.
The pipe assembly may also include the following additional elements: measuring wires, spacers and
diffusion barriers.
This standard applies only to insulated pipe assemblies, for continuous operation with hot water at various
temperatures up to 120 °C and occasionally with a peak temperature up to 140 °C.
The estimation of expected thermal life with continuous operation at various temperatures is outlined in
Annex B.
2 Normative references
The following referenced documents are indispensable for the application 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 489, District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks – Joint
assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene
EN 728, Plastics piping and ducting systems – Polyolefin pipes and fittings – Determination of oxidation
induction time
EN 10204, Metallic products – Types of inspection documents
EN 10216-2, Seamless steel tubes for pressure purposes – Technical delivery conditions – Part 2: Non-alloy and
alloy steel tubes with specified elevated temperature properties
EN 10217-1, Welded steel tubes for pressure purposes – Technical delivery conditions - Part 1: Non-alloy steel
tubes with specified room temperature properties
EN 10217-2, Welded steel tubes for pressure purposes – Technical delivery conditions – Part 2: Electric welded
non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10217-5, Welded steel tubes for pressure purposes – Technical delivery conditions – Part 5: Submerged arc
welded non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10220, Seamless and welded steel tubes – Dimensions and masses per unit length
EN 13941, Design and installation of preinsulated bonded pipe systems for district heating
EN 14419, District heating pipes – Preinsulated bonded pipe systems for directly buried hot water networks –
Surveillance systems
EN ISO 1133:2005, Plastics – Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate
(MVR) of thermoplastics (ISO 1133:2005)
EN ISO 2505, Thermoplastics pipes – Longitudinal reversion – Test methods and parameters (ISO 2505:2005)
EN ISO 3126, Plastics piping systems – Plastics components – Determination of dimensions (ISO 3126:2005)
7

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SIST EN 253:2009+A2:2015
EN 253:2009+A2:2015 (E)
EN ISO 8497:1996, Thermal insulation – Determination of steady-state thermal transmission properties of
thermal insulation for circular pipes (ISO 8497:1994)
EN ISO 8501-1:2007, Preparation of steel substrates before application of paints and related products – Visual
assessment of surface cleanliness – Part 1: Rust grades and preparation grades of uncoated steel substrates and
of steel substrates after overall removal of previous coatings (ISO 8501-1:2007)
EN ISO 9080, Plastics piping and ducting systems – Determination of the long-term hydrostatic strength of
thermoplastic materials in pipe form by extrapolation (ISO 9080:2003)
EN ISO 9692-1, Welding and allied processes – Recommendations for joint preparation – Part 1: Manual metal-
arc welding, gas-shielded metal-arc welding, gas welding, TIG welding and beam welding of steels (ISO 9692-
1:2003)
EN ISO 12162, Thermoplastics materials for pipes and fittings for pressure applications – Classification and
designation – Overall service (design) coefficient (ISO 12162:1995)
ISO 844, Rigid cellular plastics – Determination of compression properties
ISO 3127:1994, Thermoplastics pipes – Determination of resistance to external blows – Round-the-clo
...