SIST EN 17414-1:2020
(Main)District cooling pipes - Factory made flexible pipe systems - Part 1: Classification, general requirements and test methods
District cooling pipes - Factory made flexible pipe systems - Part 1: Classification, general requirements and test methods
This document specifies requirements and test methods for factory made thermally insulated flexible pipe-in-pipe assemblies for directly buried district cooling distribution systems, comprising a service pipe from DN 15 to DN 200 and a casing of polyethylene. The pipe assembly may also include the following additional elements: measuring wires, spacers and diffusion barriers.
This document is intended to be used in conjunction with prEN 17414-2 or prEN 17414-3.
This document applies only to insulated pipe assemblies, for continuous operation with water at various temperatures (1 to 30) °C and a maximum operation pressure of 25 bar dependent on material specified.
The design is based on an expected service life with continuous operation of a minimum 50 years.
This document does not cover surveillance systems.
NOTE For the transport of other liquids, for example potable water, additional requirements may be applicable.
Fernkühlungsrohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 1: Klassifikation, allgemeine Anforderungen und Prüfung
Dieses Dokument legt die Anforderungen und Prüfverfahren für werkmäßig vorgedämmte flexible Rohr-in-Rohr-Systeme für direkt erdverlegte Fernkühlungsverteilungssysteme fest, bestehend aus einem Mediumrohr von DN 15 bis DN 200 und einer Ummantelung aus Polyethylen. Das Rohrsystem darf darüber hinaus die folgenden zusätzlichen Bauteile umfassen: Messdrähte, Abstandhalter und Diffusionsbarrieren.
Dieses Dokument ist für die Verwendung im Zusammenhang mit prEN 17414 2 oder prEN 17414 3 vorgesehen.
Dieses Dokument gilt nur für gedämmte Rohrsysteme, für den Dauerbetrieb mit Wasser bei verschiedenen Temperaturen (1 bis 30) °C und einem höchsten Betriebsdruck von 25 bar je nach Werkstoff.
Die Auslegung basiert auf einer erwarteten Lebensdauer von mindestens 50 Jahren bei Dauerbetrieb.
Dieses Dokument gilt nicht für Überwachungssysteme.
ANMERKUNG Für den Transport anderer Flüssigkeiten, z. B. Trinkwasser, können zusätzliche Anforderungen gelten.
Réseaux d’eau glacée - Systèmes de tuyaux flexibles manufacturés - Partie 1 : Classification, exigences générales et méthodes d’essai
Le présent document spécifie les exigences et méthodes d’essai pour les tuyaux à double enveloppe flexibles isolés thermiquement manufacturés pour réseaux de distribution d’eau glacée enterrés directement, comprenant un tube de service de DN 15 à DN 200 et un tube de protection en polyéthylène. Le tuyau préisolé peut également comprendre les éléments supplémentaires suivants : câbles de mesure, entretoises et barrières anti-diffusion.
Le présent document est destiné à être utilisé conjointement avec le prEN 17414-2 ou le prEN 17414-3.
Le présent document s’applique seulement aux tuyaux préisolés, pour un fonctionnement en continu avec de l’eau à différentes températures (1 à 30) °C et une pression de service maximale de 25 bar en fonction du matériau spécifié.
La conception est basée sur une durée de vie escomptée avec un fonctionnement continu d’au moins 50 ans.
Le présent document ne couvre pas les systèmes de surveillance.
NOTE Pour le transport d’autres liquides, par exemple l’eau potable, des exigences supplémentaires peuvent être applicables.
Cevi za daljinsko hlajenje - Tovarniško izdelani gibki cevni sistemi - 1. del: Razvrstitev, splošne zahteve in preskusne metode
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 17414-1:2020
01-oktober-2020
Cevi za daljinsko hlajenje - Tovarniško izdelani gibki cevni sistemi - 1. del:
Razvrstitev, splošne zahteve in preskusne metode
District cooling pipes - Factory made flexible pipe systems - Part 1: Classification,
general requirements and test methods
Fernkühlungsrohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 1: Klassifikation,
allgemeine Anforderungen und Prüfung
Réseaux d’eau glacée - Systèmes de tuyaux flexibles manufacturés - Partie 1 :
Classification, exigences générales et méthodes d’essai
Ta slovenski standard je istoveten z: EN 17414-1:2020
ICS:
23.040.99 Drugi sestavni deli za Other pipeline components
cevovode
SIST EN 17414-1:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 17414-1:2020
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SIST EN 17414-1:2020
EN 17414-1
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2020
EUROPÄISCHE NORM
ICS 23.040.99
English Version
District cooling pipes - Factory made flexible pipe systems
- Part 1: Classification, general requirements and test
methods
Réseaux d'eau glacée - Systèmes de tuyaux flexibles Fernkälterohre - Werkmäßig gefertigte flexible
manufacturés - Partie 1 : Classification, prescriptions Rohrsysteme - Teil 1: Klassifikation, allgemeine
générales et méthodes d'essai Anforderungen und Prüfung
This European Standard was approved by CEN on 22 June 2020.
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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17414-1:2020 E
worldwide for CEN national Members.
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SIST EN 17414-1:2020
EN 17414-1:2020 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Symbols, indices and abbreviations . 7
5 Classification. 11
6 Requirements . 11
6.1 Thermal insulation properties . 11
6.2 Bending properties . 12
6.3 Resistance to external load . 12
6.4 Thermal insulation . 13
6.5 Casing . 13
6.6 Surveillance systems . 14
7 Test methods . 14
7.1 General. 14
7.2 Bending test . 14
7.3 Compressive creep . 18
8 Marking . 21
8.1 General marking aspects . 21
8.2 Minimum marking information . 21
9 Manufacturer's information . 22
Annex A (normative) Thermal conductivity of factory made pipe assemblies – Test
procedure . 23
Annex B (normative) Calculation of the heat flow from the medium to the ambient of
factory made buried district cooling pipes. 29
Annex C (informative) Determination of design values for the radial thermal resistance . 31
Annex D (informative) Guidelines for testing . 32
Bibliography . 34
2
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SIST EN 17414-1:2020
EN 17414-1:2020 (E)
European foreword
This document (EN 17414-1:2020) 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 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 January 2021, and conflicting national standards shall
be withdrawn at the latest by January 2021.
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.
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.
3
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SIST EN 17414-1:2020
EN 17414-1:2020 (E)
Introduction
Factory made flexible pipe systems for directly buried district cooling 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.
This document is one of a series of standards which form several parts of EN 17414, District cooling
pipes – Factory made flexible pipe systems:
— Part 1: Classification, general requirements and test methods (this document);
— 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.
The other standards from CEN/TC 107 covering this subject are:
— EN 17415-1, District cooling pipes - Bonded single pipe systems for directly buried cold water
networks - Part 1: Factory made pipe assembly of steel or plastic service pipe, polyurethane thermal
insulation and a casing of polyethylene;
— EN 17415-2, District cooling pipes – Bonded single pipe systems for directly buried cold water
networks Part 2: Factory made fitting assemblies of steel or plastic service pipe, polyurethane thermal
1
insulation and a casing of polyethylene ;
— EN 17415-3, District cooling pipes – Bonded single pipe systems for directly buried cold water
networks Part 3: Factory made steel valve assembly for steel or plastic service pipe, polyurethane
1
thermal insulation and a casing of polyethylene ;
— EN ZZZZZ-1, District cooling pipes – Design and installation of thermal insulated bonded single and
1
twin pipe systems for directly buried cold water networks – Part 1: Design ;
— EN ZZZZZ-2, District cooling pipes – Design and installation of thermal insulated bonded single and
1
twin pipe systems for directly buried cold water networks – Part 2: Installation ;
— 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 14419, District heating pipes - Bonded single and twin pipe systems for buried hot water networks
- Surveillance systems;
1
Under preparation.
4
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SIST EN 17414-1:2020
EN 17414-1:2020 (E)
1 Scope
This document specifies requirements and test methods for factory made thermally insulated flexible
pipe-in-pipe assemblies for directly buried district cooling distribution systems, comprising a service
pipe and a casing of polyethylene. The pipe assembly can also include the following additional elements:
measuring wires, spacers and diffusion barriers.
This document is intended to be used in conjunction with EN 17414-2 or EN 17414-3.
This document applies only to insulated pipe assemblies, for continuous operation with water at
various temperatures (1 to 30) °C and a maximum operation pressure of 25 bar dependent on material
specified.
The design is based on an expected service life with continuous operation of a minimum 50 years. For
pipe systems with plastic service pipes, the respective temperature profiles are defined in EN 17414-2
and EN 17414-3.
NOTE For the transport of other liquids, for example potable water, additional requirements could 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 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 17415-1:2020, District cooling pipes - Bonded single pipe systems for directly buried cold water
networks - Part 1: Factory made pipe assembly of steel or plastic service pipe, polyurethane thermal
insulation and a casing of polyethylene
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)
5
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SIST EN 17414-1:2020
EN 17414-1:2020 (E)
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)
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
For the purposes of this document, the terms and definitions given in EN 17248 and the following 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
3.1
compressive creep
slow progressive strain under the influence of stresses caused by compressive forces
3.2
flexibility
ability to withstand the flexibility test
3.3
insulation layer
layer which provides the designated thermal characteristics of the pipe assembly
3.4
insulation material
material which reduces the heat loss
3.5
operating pressure
pressure at which the cold water network is designed to operate continuously
3.6
pipe assembly
assembled product, consisting of at least one service pipe, insulating material and casing
3.7
single pipe system
SPS
pipe system with two single service pipes (one supply pipe and one return pipe)
6
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SIST EN 17414-1:2020
EN 17414-1:2020 (E)
3.8
standard dimension ratio
SDR
numerical designation of a pipe series, which is a convenient round number, approximately equal to the
dimension ratio of the nominal outside diameter and the minimum wall thickness
3.9
twin pipe system
TPS
pipe assembly with two service pipes in one casing
4 Symbols, indices and abbreviations
For the purposes of this document, symbols, indices and abbreviations given in Tables 1, 2 and 3 apply.
Table 1 — Symbols, definitions and dimensions
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 circumference tape mm
D deviation of service pipe %
e
D minimum casing diameter, measured with calliper mm
min
D maximum casing diameter, measured with calliper mm
max
d inner diameter of the service pipe at the peak of a corrugation mm
1,p
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
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
d4,p outer diameter of the casing at the peak of a corrugation mm
d outer diameter of the casing at the trough of a corrugation mm
4,t
F force N
f ageing factor /
a
7
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SIST EN 17414-1:2020
EN 17414-1:2020 (E)
Symbol Description Unit
f correction factor for differences between calculated and measured thermal /
cor
conductivities
or
correction factor for existing open splits, thermal bridges or change of the factor
for shape caused by influence of laying in the ground and the relevant factors set
up by EN ISO 23993
Fexp force resulting from heat expansion N
f moisture factor /
m
F force resulting from weight in N N
weight
2
g acceleration due to gravity m/s
H soil cover above pipe m
L length of the test specimen m
M mass of the service pipe including the water inside kg
O ovality %
P area related load on the insulation resulting from heat expansion of the service MPa
exp
pipe
Ptest area related test load MPa
P area related load on the cross section of the test specimen of the insulation MPa
weight
material
q heat flow rate W/m
q radial heat flow rate for buried single pipe system in the supply pipe W/m
f
q radial heat flow rate for buried single pipe system in the supply and return pipe W/m
f+r
q radial heat flow rate for buried single pipe system in the return pipe W/m
r
Q heat flow W
r bending radius in the axis of the pipe mm
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 supply 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
s thickness mm
s thickness of insulation, mean value of 4 measurements at 3,6,9 and 12 o’clock mm
i
position at test piece end
s maximum thickness of the insulation mm
iB
s thickness of test piece after load testing and temperature testing mm
STB
𝜏𝜏 axial shear stress MPa
𝑎𝑎x
8
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SIST EN 17414-1:2020
EN 17414-1:2020 (E)
Symbol Description Unit
t thickness of the casing mm
U coefficient of heat flow W/(m·K)
U coefficient of heat flow for buried single pipe system in the supply pipe W/(m·K)
f
U coefficient of heat flow for buried single pipe system in the return pipe W/(m·K)
r
Z depth of burial (measured to centreline of pipe assembly) m
Z corrected value of depth Z mm
c
λ thermal conductivity at 15 °C W/(m·K)
15
λ thermal conductivity of the casing W/(m·K)
C
λ calculation value of the thermal conductivity of the insulation material W/(m·K)
design
λ thermal conductivity of the 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
ϑ temperature at the inner diameter of the service pipe K
1
ϑ temperature at the inner diameter of the service supply 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 supply temperature K
f
ϑ mean temperature of the insulation K
i, mean
ϑ return temperature K
r
Σ compression of the thermal insulation %
9
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EN 17414-1:2020 (E)
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
15 at 15 °C
a ageing
amb ambient
C casing
cor corrective
design design
exp expansion
f flow (supply)
I insulation
m moisture
mean mean
min minutes
p peak of corrugation
r return
s service pipe
soil soil
STB stability
t trough of a corrugation
test test
weight weight
x placeholder for 1, 2, 3 or 4
10
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SIST EN 17414-1:2020
EN 17414-1:2020 (E)
Table 3 — Abbreviations
Abbreviation Name
PB-1 polybutene
PE 100 polyethylene classified to MRS 10
PE 80 polyethylene classified to MRS 8
PE-HD high density polyethylene
PE-MD medium density polyethylene
PE-LD low density polyethylene
PE-LLD linear low density polyethylene
PE-RT polyethylene of raised temperature resistance
PE-X cross linked polyethylene
PP-B block copolymer polypropylene
PP-H homopolymer polypropylene
PP-R random copolymer polypropylene
polypropylene random copolymer with modified
PP-RCT
crystallinity and temperature resistance
5 Classification
Table 4 defines the field of application for the different designs of pipe assembly.
Table 4 — Classification system
Part of Service pipe Pipe assembly Field of application
EN 17414 material design
Operating Design
pressure temperature
bar °C
2 plastics bonded 6, 10, 16, 20 1 to 30
and 25
3 plastics non bonded 6, 10, 16, 20 1 to 30
and 25
For operating pressures as well as temperature and time profiles, see part 2 or 3, as applicable.
6 Requirements
6.1 Thermal insulation properties
The manufacturer shall submit values for the heat flow of buried pipe assemblies for all pipe
dimensions rounded to 0,1 W/m. For single pipe assemblies the values shall be calculated in accordance
with Annex B. For twin pipe assemblies the values shall be calculated in accordance with EN 13941-1.
NOTE 1 Annex A specifies how to determine thermal conductivity.
11
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SIST EN 17414-1:2020
EN 17414-1:2020 (E)
NOTE 2 A heat flow from a district cooling service pipe to the surrounding soil is not seen as a heat loss but can
be seen as an advantage for the district cooling system. On the other hand, a heat flow into a district cooling
service pipe (normally into the supply pipe) from the surrounding soil has a negative impact on the district
cooling system.
NOTE 3 When making heat flow calculations for twin pipe systems in accordance with EN 13941-1, it is
important to specify the corrected depth Zc in millimetres to get dimensionless numbers of Zc/Di, C/Zc, etc.
6.2 Bending properties
6.2.1 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.
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.
6.2.2 Ovality
The ovality of the casing shall not exceed 30 % when tested according to 7.2.2.
6.2.3 Cracks
Cracks in the insulation layer shall not exceed a width of 5 mm when tested according 7.2.3.
NOTE 1 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.
NOTE 2 The lower the SDR of the service pipe the higher the stress in the insulation.
6.2.4 Centre line deviation of service pipe
The deviation of the service pipe to the centre line shall not exceed 20 % when tested in accordance
with 7.2.4.
6.3 Resistance to external load
6.3.1 Ring stiffness
The ring stiffness shall be tested according to EN ISO 9969 where the diameter of the test piece is the
inner diameter of the casing determined at the cross section of the pipe assembly. The ring stiffness of
2
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.
6.3.2 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.
NOTE The deformation of buried pipes with and without traffic load can be calculated according to
EN 1295-1.
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EN 17414-1:2020 (E)
6.4 Thermal insulation
6.4.1 Compressive creep
The compressive creep shall be tested in accordance with 7.3. The thermal insulation shall not be
compressed by more than 10 %.
6.4.2 Water absorption at elevated temperatures
The water absorption shall not exceed the limit defined in Table 5 for the test option selected.
For test option A, the water absorption shall be tested in accordance with the test procedure in
EN 17415-1.
Table 5 — Test option for water absorption
Test option Test temperature Water absorption (by volume)
°C %
A 100 10
B 80 1
6.4.3 Density of thermal insulation
6.4.3.1 Bonded System
3
The manufacturer shall declare a reference density in kg/m for the pipe assemblies produced. The
reference density may differ between different dimensions. The production shall follow this declared
density with a tolerance of ± 15 %.
The measurement of the density shall be done in accordance with EN 17415-1.
6.4.3.2 Non bonded system
3
The manufacturer shall declare a reference density in kg/m for the pipe assemblies produced. The
reference density could differ between different dimensions. The production shall follow this declared
density with a tolerance of ± 15 %.
The measurement of the density shall be done in accordance with EN ISO 845.
6.5 Casing
6.5.1 UV stability
Casings shall be made of a material containing carbon black to the amount of (2,0 to 2,5) % by mass.
The carbon black content shall be determined in accordance with ISO 6964.
Alternatively, after an exposure of the pipe assembly to an energy of ≥ 3,5 GJ/m2 in accordance with
EN ISO 16871, the requirements of Clauses 6.2 and 6.3 shall be met.
NOTE The UV stability requirement is for storage purposes, only.
6.5.2 Thermal stability of the material
The oxidation induction time of the material to be used for the casing shall be at least 20 minutes at
210 °C when tested in accordance with EN ISO 11357-6.
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EN 17414-1:2020 (E)
6.5.3 Stress crack resistance of the material
The time for the stress crack resistance of PE-HD materials used for the casing shall be at least
100 hours when tested at 4 MPa and 80 °C in accordance to ISO 16770.
NOTE The test can be carried out on specimens prepared by compression moulding, injection moulding or
extrusion from the same raw material as being used for the production of the casing.
PE-LD and PE-LLD materials used for the casing shall not exceed a failure rate F20 when tested for
1 000 hours in accordance with EN 60811-406:2012, procedure B.
6.5.4 Use of rework material
If rework material is used, only clean, rework material generated from the manufacturer's own
production that does not include any PU insulation material, shall be used.
6.6 Surveillance systems
If measuring elements for surveillance systems are being installed in flexible pipe systems, all elements
installed and the total installation in pipe systems shall comply with the requirements of EN 14419.
7 Test methods
7.1 General
Guidelines for testing frequencies and responsibilities are given in Annex D.
7.2 Bending test
7.2.1 Flexibility
The test shall be performed on a straight length of pipe assembly, taken directly after the production.
The pipe assembly shall be conditioned for 24 h at room temperature.
After conditioning, the pipe assembly shall be fixed onto a bending rig according to Figure 1. In addition,
twin pipes shall be bent in a way that both service pipes will have the same bending radius, see
Figure 2.
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EN 17414-1:2020 (E)
Key
1 pipe assembly
2 straps or clamps
3 bending rig
r minimum bending radius at room temperature, as stated by the manufacturer
A length between fixing points (A = 5 x D)
B width of fixing straps (approx. 50 mm)
C over length of pipe (min. 100 mm)
D outer casing diameter d4 or d4,c
U view direction of Figure 2
V view direction of Figure 3
Figure
...
SLOVENSKI STANDARD
oSIST prEN 17414-1:2019
01-november-2019
Cevi za daljinsko hlajenje - Tovarniško izdelani sistemi gibkih cevi - 1. del:
Razvrstitev, splošne zahteve in preskusne metode
District cooling pipes - Factory made flexible pipe systems - Part 1: Classification,
general requirements and test methods
Fernkühlungsrohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 1: Klassifikation,
allgemeine Anforderungen und Prüfung
Réseaux d’eau glacée - Systèmes de tuyaux flexibles manufacturés - Partie 1 :
Classification, exigences générales et méthodes d’essai
Ta slovenski standard je istoveten z: prEN 17414-1
ICS:
23.040.99 Drugi sestavni deli za Other pipeline components
cevovode
oSIST prEN 17414-1:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 17414-1:2019
DRAFT
EUROPEAN STANDARD
prEN 17414-1
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2019
ICS 23.040.99
English Version
District cooling pipes - Factory made flexible pipe systems
- Part 1: Classification, general requirements and test
methods
Réseaux d'eau glacée - Systèmes de tuyaux flexibles Fernkühlungsrohre - Werkmäßig gedämmte flexible
manufacturés - Partie 1 : Classification, exigences Rohrsysteme - Teil 1: Klassifikation, allgemeine
générales et méthodes d'essai Anforderungen und Prüfung
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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17414-1:2019 E
worldwide for CEN national Members.
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Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Symbols, indices and abbreviations . 8
5 Classification. 12
6 Requirements . 12
6.1 Thermal insulation properties . 12
6.2 Bending properties . 13
6.3 Resistance to external load . 13
6.4 Thermal insulation . 14
6.5 Casing . 14
6.6 Surveillance systems . 15
7 Test methods . 15
7.1 General. 15
7.2 Bending test . 15
7.3 Compressive creep . 19
8 Marking . 22
8.1 General marking aspects . 22
8.2 Minimum marking information . 22
9 Manufacturer's information . 23
Annex A (normative) Thermal conductivity of factory made pipe assemblies – Test
procedure . 24
Annex B (normative) Calculation of the heat flow from the medium to the ambient of
factory made buried district cooling pipes. 29
Annex C (informative) Determination of design values for the radial thermal resistance . 32
Annex D (informative) Guideline for testing . 33
Bibliography . 35
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European foreword
This document (prEN 17414-1:2019) has been prepared by Technical Committee CEN/TC 107
“Prefabricated district heating and cooling pipe systems”, the secretariat of which is held by DS.
This document is currently submitted to the CEN Enquiry.
3
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Introduction
Factory made flexible pipe systems for directly buried district cooling networks are of common
technical usage. In order to assure quality including product-related service life, to assure safety in use,
economical energy usage and to facilitate comparability in the market, CEN/TC 107 decided to set up
standards for these products.
This document is one of a series of standards which form several parts of prEN 17414, District cooling
pipes – Factory made flexible pipe systems:
— Part 1: Classification, general requirements and test methods (this document);
— 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.
The other standards from CEN/TC 107 covering this subject are:
— prEN 17415-1, District cooling pipes – Bonded single pipe systems for directly buried cold water
networks – Part 1: Factory made pipe assembly of steel or plastic service pipe, polyurethane thermal
insulation and a casing of polyethylene;
— prEN 17415-2, District cooling pipes – Bonded single pipe systems for directly buried cold water
networks Part 2: Factory made fitting assemblies of steel or plastic service pipe, polyurethane thermal
1)
insulation and a casing of polyethylene ;
— prEN 17415-3, District cooling pipes – Bonded single pipe systems for directly buried cold water
networks Part 3: Factory made steel valve assembly for steel or plastic service pipe, polyurethane
1)
thermal insulation and a casing of polyethylene ;
— prEN 17415-4, District cooling pipes – Bonded single pipe systems for directly buried cold water
networks Part 4: Joint casing assemblies of polyurethane thermal insulation and a casing of
1)
polyethylene for steel or plastic service pipes ;
— prEN ZZZZZ-1, District cooling pipes – Design and installation of thermal insulated bonded single and
2)
twin pipe systems for directly buried cold water networks – Part 1: Design ;
— prEN ZZZZZ-2, District cooling pipes – Design and installation of thermal insulated bonded single and
2)
twin pipe systems for directly buried cold water networks – Part 2: Installation ;
— prEN UUUUU, District cooling pipes – Factory made bonded pipe systems for directly buried cold
2)
water networks – Surveillance systems
1) Under development.
2) Under development.
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1 Scope
This document specifies requirements and test methods for factory made thermally insulated flexible
pipe-in-pipe assemblies for directly buried district cooling distribution systems, comprising a service
pipe from DN 15 to DN 200 and a casing of polyethylene. The pipe assembly may also include the
following additional elements: measuring wires, spacers and diffusion barriers.
This document is intended to be used in conjunction with prEN 17414-2 or prEN 17414-3.
This document applies only to insulated pipe assemblies, for continuous operation with water at
various temperatures (1 to 30) °C and a maximum operation pressure of 25 bar dependent on material
specified.
The design is based on an expected service life with continuous operation of a minimum 50 years.
This document does not cover surveillance systems.
NOTE For the transport of other liquids, for example potable water, additional requirements may 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 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 60811-100:2012, Electric and optical fibre cables - Test methods for non-metallic materials - Part 100:
General
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 60811-511:2012, Electric and optical fibre cables - Test methods for non-metallic materials - Part 511:
Mechanical tests - Measurement of the melt flow index of polyethylene compounds
EN 60811-605:2012, Electric and optical fibre cables - Test methods for non-metallic materials - Part 605:
Physical tests - Measurement of carbon black and/or mineral filler in polyethylene compounds
EN 60811-607:2012, Electric and optical fibre cables - Test methods for non-metallic materials - Part 607:
Physical tests - Test for the assessment of carbon black dispersion in polyethylene and polypropylene
prEN UUUUU, District cooling pipes – Factory made bonded pipe systems for directly buried cold water
3)
networks – Surveillance systems
3) Under development (WI 00107076).
5
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prEN 17415-1:2019, District cooling pipes – Bonded single pipe systems for directly buried cold water
networks – Part 1: Factory made pipe assembly of steel or plastic service pipe, polyurethane thermal
insulation and a casing of polyethylene
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 8497, Thermal insulation - Determination of steady-state thermal transmission properties of
thermal insulation for circular pipes (ISO 8497)
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)
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
For the purposes of this document, the following terms and definitions 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
3.1
ageing factor
f
a
factor without a dimension which expresses the ageing of the insulating layer in relation to the expected
service life
3.2
bonded system
service pipe, insulating material and casing which are bonded by the insulating material
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3.3
casing
outer layer of polyethylene, which may contain a diffusion barrier, intended to protect the thermal
insulation and service pipe from the effects of ground water, moisture and mechanical damage
3.4
casing joint
assembled product, consisting of at least insulating material and casing, designed to protect and
thermally insulate a service pipe joint
3.5
compressive creep
slow progressive strain under the influence of stresses caused by compressive forces
3.6
flexibility
ability to withstand the flexibility test
3.7
insulation layer
layer which provides the designated thermal characteristics of the pipe assembly
3.8
maximum operating temperature
exceptionally high operating temperature occurring for short periods only
3.9
melt mass-flow rate
MFR
rate of extrusion of molten resin through a die of specified length and diameter under prescribed
conditions of temperature, load and piston position in the barrel of an extrusion plastometer, the rate
being determined as the mass extruded over a specified time
3.10
moisture factor
f
m
factor without a dimension for the influence of moisture on the insulating layer in relation to the
expected service life
Note 1 to entry: The term 'moisture' as it is used here is not identical with the term 'moisture' as it is used in
prEN UUUUU (WI 00107076).
3.11
non bonded system
service pipe, insulating material and casing which are not bonded by the insulating material
3.12
operating pressure
pressure at which the cold water network is designed to operate continuously
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3.13
ovality
difference between the maximum and minimum diameter at a cross section expressed as a percentage
of the minimum diameter
3.14
pipe assembly
assembled product, consisting of at least one service pipe, insulating material and casing
3.15
pipe system
pipe assembly, plus service pipe fittings, casing joints, and other components like surveillance elements
3.16
standard dimension ratio
SDR
numerical designation of a pipe series, which is a convenient round number, approximately equal to the
dimension ratio of the nominal outside diameter, d , and the nominal wall thickness, e
n n
3.17
service pipe
medium carrying pipe which is in contact with cold water
3.18
single pipe system
SPS
pipe system with one service pipe
3.19
twin pipe system
TPS
pipe system with two service pipes
4 Symbols, indices and abbreviations
Table 1 — Symbols, definitions and dimensions
Symbol Description Unit
2
A projected area of the service pipe mm
d inner diameter of the service pipe mm
1
d inner diameter of the service pipe at the crest of a corrugation mm
1,c
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 crest of a corrugation mm
2,c
d outer diameter of the service pipe at the trough of a corrugation mm
2,t
d inner diameter of the casing mm
3
d inner diameter of the casing at the crest of a corrugation mm
3,c
d inner diameter of the casing at the trough of a corrugation mm
3,t
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Symbol Description Unit
d outer diameter of the casing mm
4
d outer diameter of the casing at the crest of a corrugation mm
4,c
d outer diameter of the casing at the trough of a corrugation mm
4,t
F force N
f ageing factor /
a
f corrective factor for differences between calculated and measured thermal /
cor
conductivities
F force resulting from heat expansion N
exp
f moisture factor /
m
F weight force N
weight
2
g acceleration due to gravity m/s
H earth covering m
L length of the test specimen m
M mass of the pipe inclusively the water inside kg
P area related load on the insulation resulting from heat expansion of the service Pa
exp
pipe
P test load Pa
test
P area related load on the cross section of the test specimen of the insulation Pa
weight
material
q heat flow rate W/m
q radial heat flow rate for buried single pipe system in the supply pipe W/m
f
q radial heat flow rate for buried single pipe system in the supply and return pipe W/m
f+r
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 m
R radial thermal resistance mK/W
2
R thermal transmittance factor from earth surface to ambient air m K/W
0
R design value for the radial resistance mK/W
design
R radial thermal resistance of the supply pipe mK/W
f
R radial thermal resistance of the return pipe mK/W
r
R radial thermal resistance of the soil mK/W
s
R radial thermal resistance of a twin pipe system mK/W
TPS
s thickness mm
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Symbol Description Unit
s thickness of test piece after load testing and temperature testing mm
STB
𝜏𝜏 axial shear stress MPa
𝑎𝑎x
t thickness of the casing mm
U coefficient of heat flow W/(mK)
U coefficient of heat flow for buried single pipe system in the supply pipe W/(mK)
f
U coefficient of heat flow for buried single pipe system in the return pipe W/(mK)
r
UTPS coefficient of heat flow in a twin pipe system W/(mK)
Z depth of laying distance from the centre line of the pipe to the surface m
Z corrected minimum value for thermal transmittance on the surface of the earth m
cor
λ thermal conductivity at 10 °C W/(mK)
10
λ thermal conductivity of the casing W/(mK)
C
λ declared thermal conductivity of a pipe system W/(mK)
decl
λ calculation value of the thermal conductivity of the insulation material W/(mK)
design
λ thermal conductivity of the insulation W/(mK)
I
λ thermal conductivity of the soil W/(mK)
soil
λ thermal conductivity of the service pipe W/(mK)
S
ϑ1 temperature at the inner diameter of the service pipe K
ϑ temperature at the inner diameter of the service supply 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 outer diameter of the casing K
4
ϑ ambient temperature K
amb
ϑ average temperature K
av
ϑ flow temperature K
f
ϑ mean temperature of the insulation K
i, mean
ϑ return temperature K
r
ϑs temperature of the soil K
Σ compression mm
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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
A ageing
Amb ambient
Av average
Ax axial
C crest of a corrugation
C casing
Cor corrective
Decl declared
design design
Exp expansion
F flow
I insulation
M moisture
R return
S service pipe
S soil
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 homopolymer
PB-R Polybutene random copolymer
PE 100 Polyethylene classified to MRS 10
PE 80 Polyethylene classified to MRS 8
PE-HD high density polyethylene
PE-LD low density polyethylene
PE-LLD linear low density polyethylene
PE-X cross linked polyethylene
PP-R Random polypropylene copolymer
Polypropylene random copolymer with modified
PP-RCT
crystallinity and temperature resistance
5 Classification
With Table 4 the field of application for the different designs of pipe assembly are defined.
Table 4 — Classification system
Part of Service pipe Pipe assembly Field of application
this material design
Operating Design
standard
pressure temperature
bar °C
2 plastics bonded 6, 10, 16, 20 1 to 30
and 25
3 plastics non bonded 6, 10, 16, 20 1 to 30
and 25
For operating pressures and temperature/time profiles, see part 2 or 3.
6 Requirements
6.1 Thermal insulation properties
The manufacturer shall submit values for the heat flow of buried pipe assemblies for all pipe
dimensions in accordance with Annex B, rounded to 0,1 W/m.
NOTE Annex A specifies how to determine thermal conductivity.
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6.2 Bending properties
6.2.1 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.
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.
6.2.2 Ovality
The ovality of the casing shall not exceed 30 % when tested according to 7.2.2.
6.2.3 Cracks
Cracks in the insulation layer shall not exceed a width of 5 mm when tested according 7.2.3.
NOTE 1 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.
NOTE 2 The lower the SDR of the service pipe the higher the stress in the insulation.
6.2.4 Centre line deviation of service pipe
The deviation of the service pipe to the centre line shall not exceed 20 % when tested in accordance
with 7.2.4.
One pipe assembly of the product range shall be taken. If a pipe manufacturer offers pipe assemblies
without spacers, a pipe assembly without a spacer shall be taken.
6.3 Resistance to external load
6.3.1 Ring stiffness
The ring stiffness shall be tested according to EN ISO 9969 where the diameter of the test piece is the
inner diameter of the casing determined at the cross section of the pipe assembly. The ring stiffness of
2
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.
6.3.2 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.
NOTE The deformation of buried pipes with and without traffic load can be calculated according to
EN 1295-1.
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6.4 Thermal insulation
6.4.1 Compressive creep
The compressive creep shall be tested in accordance with 7.3. The thermal insulation shall not be
compressed by more than 10 %.
6.4.2 Water absorption at elevated temperatures
The water absorption shall be tested in accordance with one of the options A or B as given in Table 5.
Taking the test temperature for test option B into consideration the water absorption shall be tested in
accordance with the test procedure in prEN 17415-1:2019, 5.3.5.
The water absorption shall not exceed the limit defined in Table 5 for the test option selected.
Table 5 — Test option for water absorption
Test option Test temperature Water absorption (by volume)
°C %
A 100 10
B 80 1
6.4.3 Density of thermal insulation
6.4.3.1 Bonded System
3
The manufacturer has to declare a reference density in kg/m for the pipe assemblies produced. The
reference density may differ between different dimensions. The production has to follow this declared
density with a tolerance of ±15 %.
The measurement of the density shall be done in accordance with prEN 17415-1.
6.4.3.2 Non bonded system
3
The manufacturer has to declare a reference density in kg/m for the pipe assemblies produced. The
reference density may differ between different dimensions. The production has to follow this declared
density with a tolerance of ±15 %.
The measurement of the density shall be done in accordance with EN ISO 845.
6.5 Casing
6.5.1 UV stability
Casings shall be made of a material containing (2,0 to 2,5) % by mass of carbon black (determined in
accordance with ISO 6964).
Otherwise the requirements of subclauses 6.2 and 6.3 shall still be fulfilled after an exposure to an
2
energy of ≥ 3,5 GJ/m in accordance with EN ISO 16871 for storage purposes.
6.5.2 Thermal stability of the material
The oxidation induction time of the material to be used for the casing shall be at least 20 min at 210 °C
when tested in accordance with EN ISO 11357-6.
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6.5.3 Stress crack resistance of the material
The time for the stress crack resistance of PE-HD materials used for the casing shall be at least
100 hours when tested at 4 MPa and 80 °C in accordance to ISO 16770.
NOTE The test can be carried out on specimens prepared by compression moulding, injection moulding or
extrusion from the same raw material as being used for the production of the casing.
PE-LD and PE-LLD materials used for the casing shall not exceed a failure rate F20 when tested for
1 000 hours in accordance with EN 60811-100:2012, EN 60811-406:2012, EN 60811-511:2012,
EN 60811-605:2012, EN 60811-607:2012, procedure B.
6.5.4 Use of reprocessed material
If reprocessed material is used, only clean, not degraded, reprocessed material generated from the
manufacturer's own production that does not include any PU insulation material, shall
...
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