SIST EN 15632-1:2022
(Main)District heating pipes - Pre-insulated flexible pipe systems - Part 1: Classification, general requirements and test methods
District heating pipes - Pre-insulated flexible pipe systems - Part 1: Classification, general requirements and test methods
This document provides classification, general requirements and test methods for flexible, factory made, buried district heating pipe systems.
This document is intended to be used in conjunction with part 2, 3 or 4, as applicable.
Depending on the pipe assembly (see Table 4), this document is valid for maximum media temperature of 95 °C (part 2 and 3) and maximum media temperature of 120 °C (for part 4) and design pressures of 0,6 MPa to 2,5 MPa.
The pipe systems are designed for a service life of at least 30 years. For pipe systems with plastic service pipes, the respective temperature profiles are defined in EN 15632-2 and EN 15632-3.
NOTE For the transport of other liquids, for example potable water, additional requirements may be applicable.
Fernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 1: Klassifikation, allgemeine Anforderungen und Prüfungen
Dieses Dokument enthält die Klassifikation, allgemeine Anforderungen und Prüfverfahren für flexible, werkmäßig hergestellte, erdverlegte Fernwärmenetze.
Dieses Dokument ist, wie jeweils zutreffend, für die Anwendung in Verbindung mit Teil 2, Teil 3 oder Teil 4 vorgesehen.
In Abhängigkeit von der Rohrbaugruppe (siehe Tabelle 4) gilt dieses Dokument für maximale Medientemperaturen von 95 °C (Teil 2 und Teil 3) sowie 120 °C (Teil 4) und zulässige Betriebsdrücke von 0,6 MPa bis 2,5 MPa.
Die Rohrsysteme sind für eine Nutzungsdauer von 30 Jahren ausgelegt. Für Rohrsysteme mit Mediumrohren aus Kunststoff sind die entsprechenden Temperaturprofile in EN 15632-2 und EN 15632-3 festgelegt.
ANMERKUNG Für den Transport von anderen Flüssigkeiten, wie z. B. Trinkwasser, können zusätzliche Anforderungen gelten.
Tuyaux de chauffage urbain - Systèmes de tuyaux flexibles manufacturés - Partie 1 : Classification, exigences générales et méthodes d'essai
Le présent document fournit la classification, les exigences générales et les méthodes d’essai pour les systèmes de réseaux de tuyaux de chauffage urbain flexibles, manufacturés, enterrés directement.
Le présent document est prévu pour être utilisé conjointement avec les Parties 2, 3 ou 4, si applicable.
En fonction de l'assemblage des tuyaux (voir Tableau 4), le présent document est valable pour une température maximale du fluide de 95 °C (parties 2 et 3) et une température maximale du fluide de 120 °C (pour la partie 4) et des pressions de conception de 0,6 MPa à 2,5 MPa.
Les systèmes de tuyaux sont conçus pour une durée de vie prévue d’au moins 30 ans. Pour les systèmes de tuyaux avec des tubes de service en plastique, les profils de température respectifs sont définis dans l’EN 15632-2 et l’EN 15632-3.
NOTE Pour le transport d’autres liquides, par exemple de l’eau potable, des prescriptions supplémentaires peuvent s’appliquer.
Cevi za daljinsko ogrevanje - Tovarniško izdelani gibki cevni sistemi - 1. del: Klasifikacija, splošne zahteve in preskusne metode
Ta dokument določa klasifikacijo, splošne zahteve in preskusne metode za tovarniško izdelane gibke podzemne cevne sisteme za daljinsko ogrevanje.
Ta dokument je namenjen za uporabo skupaj z 2., 3. ali 4. delom (kot je ustrezno).
Glede na cevni sestav (glej tabelo 4) se ta dokument uporablja za najvišjo temperaturo medijev 95 °C (2. in 3. del) ter za najvišjo temperaturo medijev 120 °C (za 4. del) ter za konstrukcijske tlake od 0,6 MPa do 2,5 MPa.
Predvidena življenjska doba cevnih sistemov je najmanj 30 let. Temperaturni razponi za cevne sisteme z delovnimi cevmi iz polimernih materialov so določeni v standardih EN 15632-2 in EN 15632-3.
OPOMBA: Za prevoz drugih tekočin, na primer pitne vode, morda veljajo dodatne zahteve.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 15632-1:2022
01-julij-2022
Nadomešča:
SIST EN 15632-1:2009+A1:2015
Cevi za daljinsko ogrevanje - Tovarniško izdelani gibki cevni sistemi - 1. del:
Klasifikacija, splošne zahteve in preskusne metode
District heating pipes - Pre-insulated flexible pipe systems - Part 1: Classification,
general requirements and test methods
Fernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 1: Klassifikation,
allgemeine Anforderungen und Prüfungen
Tuyaux de chauffage urbain - Systèmes de tuyaux flexibles manufacturés - Partie 1 :
Classification, exigences générales et méthodes d'essai
Ta slovenski standard je istoveten z: EN 15632-1:2022
ICS:
23.040.07 Cevovodi za daljinsko Pipeline and its parts for
ogrevanje in njihovi deli district heat
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
SIST EN 15632-1:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 15632-1:2022
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SIST EN 15632-1:2022
EN 15632-1
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2022
EUROPÄISCHE NORM
ICS 23.040.07 Supersedes EN 15632-1:2009+A1:2014
English Version
District heating pipes - Factory made flexible pipe systems
- Part 1: Classification, general requirements and test
methods
Tuyaux de chauffage urbain - Systèmes de tuyaux Fernwärmerohre - Werkmäßig gedämmte flexible
flexibles manufacturés - Partie 1 : Classification, Rohrsysteme - Teil 1: Klassifikation, allgemeine
exigences générales et méthodes d'essai Anforderungen und Prüfungen
This European Standard was approved by CEN on 27 March 2022.
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, Turkey 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15632-1:2022 E
worldwide for CEN national Members.
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SIST EN 15632-1:2022
EN 15632-1:2022 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions and symbols . 7
3.1 Terms and definitions . 7
3.2 Symbols, indices and abbreviations . 7
4 Classification . 11
5 Design requirements . 11
5.1 Thermal insulation properties . 11
5.2 Bending test . 12
5.2.1 Flexibility . 12
5.2.2 Ovality . 12
5.2.3 Cracks . 12
5.3 Resistance to external load. 12
5.3.1 Ring stiffness . 12
5.3.2 Impact resistance . 12
5.4 Thermal insulation . 12
5.4.1 Compressive creep. 12
5.4.2 Water absorption at elevated temperatures . 12
5.4.3 Density of thermal insulation . 13
5.5 Casing . 13
5.5.1 UV stability . 13
5.5.2 Thermal stability of the material . 13
5.5.3 Stress crack resistance of the material . 13
5.5.4 Use of rework material . 13
5.6 Surveillance systems . 14
6 Test methods . 14
6.1 General . 14
6.2 Bending test . 14
6.2.1 Flexibility . 14
6.2.2 Ovality test . 16
6.2.3 Cracks in the thermal insulation . 16
6.3 Compressive creep. 17
6.3.1 General . 17
6.3.2 Principles of testing . 17
6.3.3 Test apparatus. 17
6.3.4 Test specimen . 19
6.3.5 Test procedure . 19
6.3.6 Test force and expression of results . 20
7 Marking . 21
7.1 General marking aspects . 21
7.2 Minimum marking information . 21
8 Manufacturer's information . 22
2
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SIST EN 15632-1:2022
EN 15632-1:2022 (E)
Annex A (normative) Thermal conductivity of factory made pipes – Test procedure . 23
A.1 General . 23
A.2 Requirements . 23
A.2.1 Test specimen . 23
A.2.2 Operating temperature . 23
A.2.3 Types of apparatus . 23
A.3 Apparatus . 23
A.3.1 Guarded end apparatus . 23
A.3.2 Calibrated end apparatus . 23
A.3.3 Dimensions . 24
A.3.4 Heater pipe surface temperature . 24
A.4 Test specimen . 24
A.4.1 Conditioning . 24
A.4.2 Surface temperature measurement . 24
A.4.3 Location of temperature sensors . 24
A.5 Procedure . 24
A.5.1 Test length . 24
A.5.2 Diameter and dimension measurement. 24
A.5.3 Thickness of casing . 26
A.5.4 Ambient requirements . 26
A.5.5 Test pipe temperature . 26
A.5.6 Power supply . 26
A.5.7 Axial heat loss . 27
A.5.8 Test period and stability . 27
A.6 Calculations - Thermal conductivity . 27
Annex B (informative) Determination of design values for the radial thermal resistance . 29
Annex C (informative) Guideline for testing . 30
Bibliography . 32
3
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SIST EN 15632-1:2022
EN 15632-1:2022 (E)
European foreword
This document (EN 15632-1:2022) has been prepared by Technical Committee CEN/TC 107
“Prefabricated district heating and district cooling 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 November 2022, and conflicting national standards
shall be withdrawn at the latest by November 2022.
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 15632-1:2009+A1:2014.
This document is one of a series of standards which form several parts of EN 15632, District heating
pipes — Factory made flexible pipe systems:
— Part 1: Classification, general requirements and test methods;
— Part 2: Bonded system with plastic service pipes; requirements and test methods;
— Part 3: Non bonded system with plastic service pipes; requirements and test methods;
— Part 4: Bonded system with metal service pipes; requirements and test methods.
In comparison with EN 15632-1:2009+A1:2014, the following changes have been made:
a) improved description of the bending test in 5.2 and 6.2;
b) improved description of the thermal insulation in 5.4;
c) improved description of the compressive creep test in 6.3;
d) improved calculation of the thermal conductivity in Annex A, A.6;
e) improved calculation of the radial thermal resistance in Annex B;
f) completely revised “guideline for testing” in the informative Annex C.
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, Turkey and the
United Kingdom.
4
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SIST EN 15632-1:2022
EN 15632-1:2022 (E)
Introduction
District heating technology has developed rapidly since its origin and especially in recent times. Today,
there are different generations of district heating networks. The technologies of these generations are
driven by the different heat sources and operating temperatures used.
CEN/TC 107 provides a set of European standard series for rigid and flexible piping systems in district
heating to suit all generations and requirements of district heating networks in the market.
The standard documents ensure quality for pre-fabricated piping systems in district heating.
This standard series covers flexible, pre-fabricated piping systems for operation conditions as described
in the scope of this document.
5
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SIST EN 15632-1:2022
EN 15632-1:2022 (E)
1 Scope
This document specifies classification, general requirements and test methods for flexible, factory
made, buried district heating pipe systems.
This document is intended to be used in conjunction with part 2, 3 or 4, as applicable.
Depending on the pipe assembly (see Table 4), this document is applicable to a maximum operating
temperature of 95 °C (part 2 and 3) and a maximum operating temperature of 120 °C (for part 4) and
design pressures of 0,6 MPa to 2,5 MPa.
The pipe systems are designed for a service life of at least 30 years. For pipe systems with plastic
service pipes, the respective temperature profiles are specified in EN 15632-2 and EN 15632-3.
NOTE For the transport of other liquids, for example potable water, additional requirements can be
applicable.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 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 1605, Thermal insulating products for building applications - Determination of deformation under
specified compressive load and temperature conditions
EN 1606, Thermal insulating products for building applications - Determination of compressive creep
EN 12085, Thermal insulating products for building applications - Determination of linear dimensions of
test specimens
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 14419, District heating pipes - Bonded single and twin pipe systems for buried hot water networks -
Surveillance systems
EN 17248, District heating and district cooling pipe systems - Terms and definitions
EN 60811-406:2012, Electric and optical fibre cables - Test methods for non-metallic materials - Part 406:
Miscellaneous tests - Resistance to stress cracking of polyethylene and polypropylene compounds
EN ISO 845, Cellular plastics and rubbers - Determination of apparent density (ISO 845)
EN ISO 3127, Thermoplastics pipes - Determination of resistance to external blows - Round-the-clock
method (ISO 3127)
EN ISO 9967, Thermoplastics pipes - Determination of creep ratio (ISO 9967)
EN ISO 9969, Thermoplastics pipes - Determination of ring stiffness (ISO 9969)
6
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SIST EN 15632-1:2022
EN 15632-1:2022 (E)
EN ISO 11357-6, Plastics - Differential scanning calorimetry (DSC) - Part 6: Determination of oxidation
induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT) (ISO 11357-6)
EN ISO 16871, Plastics piping and ducting systems - Plastics pipes and fittings - Method for exposure to
direct (natural) weathering (ISO 16871)
ISO 6964, Polyolefin pipes and fittings — Determination of carbon black content by calcination and
pyrolysis — Test method
ISO 16770, Plastics — Determination of environmental stress cracking (ESC) of polyethylene — Full-notch
creep test (FNCT)
3 Terms and definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 17248 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.2 Symbols, indices and abbreviations
For the purposes of this document, the following symbols in Table 1, indices in Table 2 and
abbreviations in Table 3 apply.
7
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SIST EN 15632-1:2022
EN 15632-1:2022 (E)
Table 1 — Symbols
Symbol Description Unit
2
A
projected area of the service pipe (length * width) mm
d
inner diameter of the service pipe mm
1
D actual diameter of casing, measured with measuring tape mm
De
deviation of service pipe %
D
minimum casing diameter, measured with calliper mm
min
D
maximal casing diameter, measured with calliper mm
max
d
inner diameter of the service pipe at the peak of a corrugation mm
1p,
d
inner diameter of the service pipe at the trough of a corrugation mm
1,t
d
outer diameter of the service pipe mm
2
d
outer diameter of the service pipe at the peak of a corrugation mm
2p,
d
outer diameter of the service pipe at the trough of a corrugation mm
2t,
d
inner diameter of the casing mm
3
d
inner diameter of the casing at the peak of a corrugation mm
3p,
d
inner diameter of the casing at the trough of a corrugation mm
3t,
d
outer diameter of the casing mm
4
d
outer diameter of the casing at the peak of a corrugation mm
4,p
d
outer diameter of the casing at the trough of a corrugation mm
4t,
F
force N
f
ageing factor /
a
f moisture factor /
m
F
force resulting from weight in N N
weight
g
2
acceleration due to gravity
m/s
L length of the test specimen m
M
mass of the service pipe including the water inside kg
O
ovality %
P
area related test load MPa
test
8
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SIST EN 15632-1:2022
EN 15632-1:2022 (E)
Symbol Description Unit
area related load on the cross section of the test specimen of the thermal
P
MPa
weight
insulation material
q
heat flow rate W/m
r bending radius in the axis of the pipe mm
R radial thermal resistance m⋅K/W
R
radial thermal resistance of the return pipe m⋅K/W
r
s
thickness mm
s
thickness of test specimen after load testing and temperature testing mm
STB
t
thickness of the casing mm
λ
thermal conductivity of the thermal insulation at 50 °C W/(m⋅K)
50
λ
thermal conductivity of the casing W/(m⋅K)
C
calculation value of the thermal conductivity of the thermal insulation
λ
W/(m⋅K)
design
material
λ
thermal conductivity of the thermal insulation W/(m⋅K)
I
λ
thermal conductivity of the soil W/(m⋅K)
s
λ
thermal conductivity of the service pipe W/(m⋅K)
SP
ϑ
temperature at the inner diameter of the service pipe K
1
ϑ
temperature at the inner diameter of the service flow pipe K
1f,
ϑ
temperature at the inner diameter of the service return pipe K
1,r
ϑ
temperature at the outer diameter of the service pipe K
2
ϑ
temperature at the inner diameter of the casing K
3
ϑ temperature at the outer diameter of the casing K
4
ϑ
flow temperature K
f
ϑ
mean temperature of the thermal insulation K
i,mean
ϑ
return temperature K
r
∑
Compression of the thermal insulation %
9
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SIST EN 15632-1:2022
EN 15632-1:2022 (E)
Table 2 — Indices
Symbol Definition
1 position at the inner diameter of the service pipe
2 position at the outer diameter of the service pipe
3 position at the inner diameter of the casing
4 position at the outer diameter of the casing
50 at 50 °C
a ageing
amb ambient
ax axial
C casing or casing pipe
cor corrective
design design
f flow
I thermal insulation
mean mean
min minutes
p peak of a corrugation
r return
S service pipe
soil soil
steel steel
t trough of a corrugation
test test
weight weight
x placeholder for 1,2,3 or 4
ϑ
average temperature
av
10
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SIST EN 15632-1:2022
EN 15632-1:2022 (E)
Table 3 — Abbreviations
Abbreviation Name
PB-H polybutene homopolymer
PE-HD high density polyethylene
PE-MD medium density polyethylene
PE-LD low density polyethylene
PE-LLD linear low density polyethylene
PE-X cross linked polyethylene
4 Classification
This document shall only be used in conjunction with part 2, 3 or 4, as applicable. Table 4 shows an
overview of the different classification systems and its field of application according to part 2, 3 and 4.
The detailed classification including the specific temperature profile and the design pressure is
specified in Clause 4 of the relevant part 2, 3 and 4.
Table 4 — Overview of classification systems
Field of application
Service Pipe
Part of this
Continuous Maximum
pipe assembly
Design
standard
operating operating
material design
pressure
temperature temperature
MPa °C °C
2 plastics bonded 0,6, 0,8 or 1,0 80 95
3 plastics non bonded 0,6, 0,8 or 1,0 80 95
4 metal bonded 1,6 or 2,5 120 120
5 Design requirements
5.1 Thermal insulation properties
The manufacturer shall submit values for the heat loss of buried pipe assemblies for all pipe dimensions
in accordance with EN 13941-1, rounded to 0,1 W/m. The coefficient of thermal conductivity of soil
shall be taken for dry soil: λ = 1,0 W/(m⋅K).
s
NOTE Annex A specifies how to determine thermal conductivity, and Annex B informs about design values for
the radial thermal resistance.
11
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SIST EN 15632-1:2022
EN 15632-1:2022 (E)
5.2 Bending test
5.2.1 Flexibility
The flexibility of the pipe assembly is verified by testing at the minimum bending radius (see 6.2.1). The
manufacturer of the pipe assembly shall declare the minimum installation bending radii for all
dimensions produced, related to the central axis of the pipe assembly.
The declared minimum installation bending radius of the pipe assembly according to this document
shall not exceed thirty times the outer diameter of the casing.
When bending to the minimum radius, the service pipe and the casing of the pipe assembly shall not
break.
5.2.2 Ovality
The ovality of the outer casing shall not exceed 30 % when measured according to 6.2.2.
5.2.3 Cracks
Cracks in the thermal insulation layer shall not exceed a width of 5 mm when tested according 6.2.3.
NOTE With a crack size below 5 mm the number of cracks is not relevant for the integrity of the pipe system,
because the temperature on the casing will not be influenced.
5.3 Resistance to external load
5.3.1 Ring stiffness
The ring stiffness shall be tested according to EN ISO 9969 where the diameter of the test specimen is
the inner diameter of the casing determined at the cross section of the pipe assembly. The ring stiffness
2
of the pipe assembly shall be at least 4 kN/m and the ring stiffness divided by the creep ratio according
to EN ISO 9967 shall be at least 0,8.
NOTE The deformation of buried pipes with and without traffic load can be calculated according to
EN 1295-1.
5.3.2 Impact resistance
The impact resistance shall be tested according to EN ISO 3127. The casing of pipe assemblies and joint
casings shall show no cracks when exposed to an impact of 4 J.
5.4 Thermal insulation
5.4.1 Compressive creep
The compressive creep shall be tested according to 6.3. The thermal insulation shall not be compressed
by more than 10 %.
5.4.2 Water absorption at elevated temperatures
The water absorption shall be tested according to EN 253. The water absorption shall not exceed the
limits of one of the test options specified in Table 5.
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SIST EN 15632-1:2022
EN 15632-1:2022 (E)
Table 5 — Test option for water absorption
Test option Test temperature Water absorption (by volume)
°C %
A 100 10
B 80 1
5.4.3 Density of thermal insulation
5.4.3.1 General
3
The manufacturer shall declare a reference density in k
...
SLOVENSKI STANDARD
oSIST prEN 15632-1:2021
01-januar-2021
Cevi za daljinsko ogrevanje - Izolirani gibki cevni sistemi - 1. del: Klasifikacija,
splošne zahteve in preskusne metode
District heating pipes - Pre-insulated flexible pipe systems - Part 1: Classification,
general requirements and test methods
Fernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 1: Klassifikation,
allgemeine Anforderungen und Prüfungen
Tuyaux de chauffage urbain - Systèmes de tuyaux flexibles préisolés - Partie 1 :
Classification, exigences générales et méthodes d'essai
Ta slovenski standard je istoveten z: prEN 15632-1
ICS:
23.040.07 Cevovodi za daljinsko Pipeline and its parts for
ogrevanje in njihovi deli district heat
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
oSIST prEN 15632-1:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 15632-1:2021
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oSIST prEN 15632-1:2021
DRAFT
EUROPEAN STANDARD
prEN 15632-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2020
ICS 23.040.07 Will supersede EN 15632-1:2009+A1:2014
English Version
District heating pipes - Pre-insulated flexible pipe systems
- Part 1: Classification, general requirements and test
methods
Tuyaux de chauffage urbain - Systèmes de tuyaux Fernwärmerohre - Werkmäßig gedämmte flexible
flexibles préisolés - Partie 1 : Classification, exigences Rohrsysteme - Teil 1: Klassifikation, allgemeine
générales et méthodes d'essai Anforderungen und Prüfungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 107.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15632-1:2020 E
worldwide for CEN national Members.
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oSIST prEN 15632-1:2021
prEN 15632-1:2020 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions and symbols . 7
3.1 Terms and definitions . 7
3.2 Symbols, indices and abbreviations . 7
4 Classification . 12
5 Design requirements . 12
5.1 Thermal insulation properties . 12
5.2 Bending test . 12
5.2.1 Flexibility . 12
5.2.2 Ovality . 13
5.2.3 Cracks . 13
5.2.4 Centre line deviation of service pipe. 13
5.3 Resistance to external load. 13
5.3.1 Ring stiffness . 13
5.3.2 Impact resistance . 13
5.4 Thermal insulation . 13
5.4.1 Compressive creep. 13
5.4.2 Water absorption at elevated temperatures . 13
5.4.3 Density of thermal insulation . 14
5.5 Casing . 14
5.5.1 UV stability . 14
5.5.2 Thermal stability of the material . 14
5.5.3 Stress crack resistance of the material . 14
5.5.4 Use of rework material . 14
5.6 Surveillance systems . 15
6 Test methods . 15
6.1 General . 15
6.2 Bending test . 15
6.2.1 Flexibility . 15
6.2.2 Ovality test . 16
6.2.3 Cracks in the thermal insulation . 17
6.3 Compressive creep. 18
6.3.1 General . 18
6.3.2 Principles of testing . 18
6.3.3 Test apparatus. 18
6.3.4 Test specimen . 20
6.3.5 Test procedure . 20
6.3.6 Test force and expression of results . 20
7 Marking . 22
7.1 General marking aspects . 22
7.2 Minimum marking information . 22
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8 Manufacturer's information . 22
Annex A (normative) Thermal conductivity of factory made pipes – Test procedure . 24
A.1 General . 24
A.2 Requirements . 24
A.2.1 Test specimen . 24
A.2.2 Operating temperature . 24
A.2.3 Types of apparatus . 24
A.3 Apparatus . 24
A.3.1 Guarded end apparatus . 24
A.3.2 Calibrated end apparatus . 24
A.3.3 Dimensions . 25
A.3.4 Heater pipe surface temperature . 25
A.4 Test specimen . 25
A.4.1 Conditioning . 25
A.4.2 Surface temperature measurement . 25
A.4.3 Location of temperature sensors . 25
A.5 Procedure . 25
A.5.1 Test length . 25
A.5.2 Diameter and dimension measurement. 25
A.5.3 Thickness of casing . 27
A.5.4 Ambient requirements . 27
A.5.5 Test pipe temperature . 27
A.5.6 Power supply . 27
A.5.7 Axial heat loss . 28
A.5.8 Test period and stability . 28
A.6 Calculations - Thermal conductivity . 28
Annex B (informative) Determination of design values for the radial thermal resistance . 30
Annex C (informative) Guideline for testing . 31
Bibliography . 33
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prEN 15632-1:2020 (E)
European foreword
This document (prEN 15632-1:2020) has been prepared by Technical Committee CEN/TC 107
“Prefabricated district heating and district cooling pipe system”, the secretariat of which is held by DS.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 15632-1:2009+A1:2014.
This document is one of a series of standards which form several parts of EN 15632, District heating
pipes — Factory made flexible pipe systems:
Part 1: Classification, general requirements and test methods;
Part 2: Bonded system with plastic service pipes; requirements and test methods;
Part 3: Non bonded system with plastic service pipes; requirements and test methods;
Part 4: Bonded system with metal service pipes; requirements and test methods.
In comparison to EN 15632-1:2009+A1:2014 the following changes have been made:
a) improved description of the bending test in 5.2 and 6.2;
b) improved description of the thermal insulation in 5.4;
c) improved description of the compressive creep test in 6.3;
d) improved calculation of the thermal conductivity in Annex A, A.6;
e) improved calculation of the radial thermal resistance in Annex B;
f) completely revised “guideline for testing” in the informative Annex C.
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Introduction
Flexible pipe systems in district heating networks are of common technical usage. In order to ensure
quality including product-related service life, to ensure safety in use, economical energy usage and to
facilitate comparability in the market, CEN/TC 107 decided to set up standards for these products.
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1 Scope
This document provides classification, general requirements and test methods for flexible, factory
made, buried district heating pipe systems.
This document is intended to be used in conjunction with part 2, 3 or 4, as applicable.
Depending on the pipe assembly (see Table 4), this document is valid for maximum media temperature
of 95 °C (part 2 and 3) and maximum media temperature of 120 °C (for part 4) and design pressures of
0,6 MPa to 2,5 MPa.
The pipe systems are designed for a service life of at least 30 years. For pipe systems with plastic
service pipes, the respective temperature profiles are defined in EN 15632-2 and EN 15632-3.
NOTE For the transport of other liquids, for example potable water, additional requirements can be
applicable.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 253, District heating pipes — Bonded pipe systems for directly buried hot water networks — Factory
made pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene
EN 1605, Thermal insulating products for building applications — Determination of deformation under
specified compressive load and temperature conditions
EN 1606, Thermal insulating products for building applications — Determination of compressive creep
EN 12085, Thermal insulating products for building applications — Determination of linear dimensions of
test specimens
EN 13941, District heating pipes — Design and installation of thermal insulated bonded single and twin
pipe systems for directly buried hot water networks
EN 14419, District heating pipes — Bonded single and twin pipe systems for buried hot water networks —
Surveillance systems
EN 60811-4-1:2004, Electric and optical fibre cables — Test methods for non-metallic materials — Part
406: Miscellaneous tests — Resistance to environmental stress cracking of polyethylene and polypropylene
compounds (IEC 60811-406-1:2012)
EN ISO 845, Cellular plastics and rubbers — Determination of apparent density (ISO 845:2006)
EN ISO 3127, Thermoplastics pipes — Determination of resistance to external blows — Round-the-clock
method (ISO 3127)
EN ISO 9967, Thermoplastics pipes — Determination of creep ratio (ISO 9967)
EN ISO 9969, Thermoplastics pipes — Determination of ring stiffness (ISO 9969)
EN ISO 11357-6, Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation
induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT) (ISO 11357-6)
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EN ISO 16871, Plastics piping and ducting systems — Plastics pipes and fittings — Method for exposure to
direct (natural) weathering (ISO 16871)
EN ISO 23993, Thermal insulation products for building equipment and industrial installations —
Determination of design thermal conductivity (ISO 23993)
ISO 6964, Polyolefin pipes and fittings — Determination of carbon black content by calcination and
pyrolysis — Test method
ISO 16770, Plastics — Determination of environmental stress cracking (ESC) of polyethylene — Full-notch
creep test (FNCT)
3 Terms and definitions and symbols
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 17248 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.2 Symbols, indices and abbreviations
For the purposes of this document, the following symbols in Table 1, indices in Table 2 and
abbreviations in Table 3 apply.
Table 1 — Symbols
Symbol Description Unit
2
A
projected area of the service pipe (length * width)
mm
d
inner diameter of the service pipe mm
1
D
actual diameter of casing, measured with measuring tape mm
De
deviation of service pipe %
D
minimum casing diameter, measured with calliper mm
min
D
maximal casing diameter, measured with calliper mm
max
d
inner diameter of the service pipe at the peak of a corrugation mm
1p,
d
inner diameter of the service pipe at the trough of a corrugation mm
1,t
d
outer diameter of the service pipe mm
2
d
outer diameter of the service pipe at the peak of a corrugation mm
2,p
d
outer diameter of the service pipe at the trough of a corrugation mm
2,t
d
inner diameter of the casing mm
3
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Symbol Description Unit
d
inner diameter of the casing at the peak of a corrugation mm
3,p
d
inner diameter of the casing at the trough of a corrugation mm
3,t
d
outer diameter of the casing mm
4
d
outer diameter of the casing at the peak of a corrugation mm
4,p
d
outer diameter of the casing at the trough of a corrugation mm
4,t
F
force N
f
ageing factor /
a
corrective factor for differences between calculated and measured thermal
conductivities or
f
/
is the correction factor for existing open splits, thermal bridges or change of
cor
the factor for shape caused by influence of lying in the ground and the
relevant factors set up by EN ISO 23993.
F
force resulting from heat expansion N
exp
f
moisture factor /
m
F
is the force resulting from weight in N N
weight
g
2
acceleration due to gravity
m/s
L
length of the test specimen m
M
mass of the service pipe including the water inside kg
O
Ovality %
area related load on the thermal insulation resulting from heat expansion of
P
MPa
exp
the service pipe
P
area related test load MPa
test
area related load on the cross section of the test specimen of the thermal
P
MPa
weight
insulation material
q
heat flow rate W/m
q
radial heat flow rate for buried single pipe system in the flow pipe W/m
f
radial heat flow rate for buried single pipe system in the flow and return
q
W/m
fr+
pipe
q
radial heat flow rate for buried single pipe system in the return pipe W/m
r
q
radial heat flow rate for buried twin pipe system W/m
TPS
Q
heat flow W
r
bending radius in the axis of the pipe mm
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Symbol Description Unit
R
radial thermal resistance m⋅K/W
2
R
thermal resistance from earth surface to ambient air
m ⋅K/W
0
R
design value for the radial resistance m⋅K/W
design
R
radial thermal resistance of the flow pipe m⋅K/W
f
R
radial thermal resistance of the return pipe m⋅K/W
r
R
radial thermal resistance of the soil m⋅K/W
soil
R
radial thermal resistance of a twin pipe system m⋅K/W
TPS
s
thickness mm
thickness of thermal insulation, mean value of 4 measurements at 3,6,9 and
S
mm
i
12 o’clock position at test specimen end
S B
maximum thickness of the thermal insulation mm
i
s
thickness of test specimen after load testing and temperature testing mm
STB
τ
axial shear stress MPa
ax
t
thickness of the casing mm
U
coefficient of heat loss W/(m⋅K)
U
coefficient of heat loss for buried single pipe system in the flow pipe W/(m⋅K)
f
U
coefficient of heat loss for buried single pipe system in the return pipe W/(m⋅K)
r
U
coefficient of heat loss in a twin pipe system W/(m⋅K)
TPS
Z
depth of laying distance from the centre line of the pipe to the surface m
Z
is the soil coverage above the centre line of the pipe m
Z
is a corrected value for the soil coverage m
c
corrected minimum value for thermal transmittance on the surface of the
Z
m
cor
earth
λ
thermal conductivity of the thermal insulation at 50 °C W/(m⋅K)
50
λ
thermal conductivity of the casing W/(m⋅K)
C
calculation value of the thermal conductivity of the thermal insulation
λ
W/(m⋅K)
design
material
λ
thermal conductivity of the thermal insulation W/(m⋅K)
I
λ
thermal conductivity of the soil W/(m⋅K)
soil
λ
thermal conductivity of the service pipe W/(m⋅K)
S
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Symbol Description Unit
λ
thermal conductivity of steel W/(m⋅K)
steel
λ
thermal conductivity of a twin pipe system at any average temperature W/(m⋅K)
TPS,ϑav
ϑ
temperature at the inner diameter of the service pipe K
1
ϑ
temperature at the inner diameter of the service flow pipe K
1, f
ϑ
temperature at the inner diameter of the service return pipe K
1,r
ϑ
temperature at the outer diameter of the service pipe K
2
ϑ
temperature at the inner diameter of the casing K
3
ϑ
temperature at the outer diameter of the casing K
4
ϑ
ambient temperature K
amb
ϑ
flow temperature K
f
ϑ
mean temperature of the thermal insulation K
i,mean
ϑ
return temperature K
r
∑
Compression of the thermal insulation %
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Table 2 — Indices
Symbol Definition
0 thermal transmittance (from earth surface to ambient air)
1 position at the inner diameter of the service pipe
2 position at the outer diameter of the service pipe
3 position at the inner diameter of the casing
4 position at the outer diameter of the casing
50 at 50 °C
a ageing
amb ambient
av average
ax axial
C casing or casing pipe
cor corrective
decl declared
design design
exp expansion
f flow
I thermal insulation
m moisture
mean mean
min minutes
p peak of a corrugation
r return
S service pipe
soil soil
steel steel
STB stability
t trough of a corrugation
test test
TPS twin Pipe System
weight weight
x placeholder for 1,2,3 or 4
ϑ
average temperature
av
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Table 3 — Abbreviations
Abbreviation Name
PB-H polybutene
PE-HD high density polyethylene
PE-MD medium density polyethylene
PE-LD low density polyethylene
PE-LLD linear low density polyethylene
PE-X cross linked polyethylene
4 Classification
This document shall only be used in conjunction with part 2, 3 or 4, as applicable. Table 4 shows an
overview of the different classification systems and its field of application according to part 2, 3 and 4.
The detailed classification including the specific temperature profile and the design pressure is defined
in Clause 4 of the relevant part 2, 3 and 4.
Table 4 — Overview of Classification system
Part of this
Field of application
standard
Continuous Maximum
Design operating operating
Service Pipe
pressure temperatur temperatur
pipe assembly
e e
material design
MPa
°C °C
2 plastics bonded 0,6, 0,8 or 1,0 80 95
3 plastics non bonded 0,6, 0,8 or 1,0 80 95
4 metal bonded 1,6 or 2,5 120 140
5 Design requirements
5.1 Thermal insulation properties
The manufacturer shall submit values for the heat loss of buried pipe assemblies for all pipe dimensions
in accordance to EN 13941-1, rounded to 0,1 W/m.
NOTE Annex A specifies how to determine thermal conductivity, and Annex B informs about design values for
the radial thermal resistance.
5.2 Bending test
5.2.1 Flexibility
The flexibility of the pipe assembly is verified by testing at the minimum bending radius. The
manufacturer of the pipe assembly shall declare the minimum installation bending radii for all
dimensions produced, related to the central axis of the pipe assembly.
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The minimum declared installation bending radius of the pipe assembly according to this document
shall not exceed thirty times the outer diameter of the casing.
When bending to the minimum radius, the service pipe and the casing of the pipe assembly shall not
break.
5.2.2 Ovality
When bending to the minimum radius, the service pipe and the casing of the pipe assembly shall not
break.
5.2.3 Cracks
Cracks in the thermal insulation layer shall not exceed a width of 5 mm when tested according 6.2.3.
NOTE With a crack size below 5 mm the number of crack is not relevant for the integrity of the pipe system,
because the temperature on the casing will not be influenced.
5.2.4 Centre line deviation of service pipe
The deviation of the service pipe to the centre line of the pipe assembly shall not ex
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