SIST EN 17415-1:2020

SLOVENSKI STANDARD
oSIST prEN 17415-1:2019
01-november-2019
Cevi za daljinsko hlajenje - Spojeni enocevni sistemi za neposredno vkopana
hladnovodna omrežja - 1. del: Tovarniško izdelan cevni sestav iz jeklene ali
plastične delovne cevi, poliuretanske toplotne izolacije in polietilenskega plašča
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
Fernkältesysteme - Verbundmantelrohrsysteme für direkt erdverlegte Fernkältenetze -
Teil 1: Werkmäßig gedämmtes Verbund-Rohrsystem, bestehend aus Stahl oder Plastik
Mediumrohr, Polyurethan-Wärmedämmung und einem Außenmantel aus Polyethylen
Réseaux d'eau glacée - Systèmes bloqués de tuyaux préisolés pour les réseaux d’eau
glacée enterrés directement - Partie 1 : Tube de service en acier ou en matière
plastique, isolation thermique en polyuréthane et protection en polyéthylène
Ta slovenski standard je istoveten z: prEN 17415-1
ICS:
23.040.99 Drugi sestavni deli za Other pipeline components
cevovode
oSIST prEN 17415-1:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 17415-1:2019


DRAFT
EUROPEAN STANDARD
prEN 17415-1
NORME EUROPÉENNE

EUROPÄISCHE NORM

July 2019
ICS 23.040.99
English Version

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
Réseaux d'eau glacée - Systèmes bloqués de tuyaux Fernkältesysteme - Verbundmantelrohrsysteme für
préisolés pour les réseaux d'eau glacée enterrés direkt erdverlegte Fernkältenetze - Teil 1: Werkmäßig
directement - Partie 1 : Tube de service en acier ou en gedämmtes Verbund-Rohrsystem, bestehend aus Stahl
matière plastique, isolation thermique en polyuréthane oder Plastik Mediumrohr, Polyurethan-
et protection en polyéthylène Wärmedämmung und einem Außenmantel aus
Polyethylen
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 17415-1:2019 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 . 7
4 Requirements . 9
4.1 General. 9
4.2 Service pipes . 9
4.3 Casing . 13
4.4 Polyurethane (PUR) foam thermal insulation. 15
4.5 Pipe assembly . 16
5 Test methods . 21
5.1 General conditions and test specimens . 21
5.2 Casing . 22
5.3 Polyurethane (PUR) foam thermal insulation. 24
5.4 Pipe assembly . 26
6 Marking . 32
6.1 General. 32
6.2 Service pipe . 33
6.3 Casing . 33
6.4 Pipe assembly . 33
Annex A (informative) Guidelines for inspection and testing . 34
Annex B (normative) Thermal conductivity of factory made pipe assemblies – Test
procedure . 38
Annex C (informative) Radial deformation behaviour of the polyurethane (PUR) foam . 43
Annex D (informative) Waste treatment and recycling . 44
Annex E (informative) Application of Miner's Rule . 45

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European foreword
This document (prEN 17415-1:2019) 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.
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Introduction
Factory made bonded single 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 17415, 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 (this document);
— Part 2: Factory made fitting assemblies of steel or plastic service pipe, polyurethane thermal insulation
1)
and a casing of polyethylene ;
— Part 3: Factory made steel valve assembly for steel or plastic service pipe, polyurethane thermal
1)
insulation and a casing of polyethylene ;
— Part 4: Joint casing assemblies of polyurethane thermal insulation and a casing of polyethylene for
1)
steel or plastic service pipes .
The other standards from CEN/TC 107 covering this subject are:
— prEN 17414-1, District cooling pipes – Factory made flexible pipe systems – Part 1: Classification,
general requirements and test methods;
— prEN 17414-2, District cooling pipes – Factory made flexible pipe systems – Part 2: Bonded system
with plastic service pipes; requirements and test methods;
— prEN 17414-3, District cooling pipes – Factory made flexible pipe systems – Part 3: Non bonded
system with plastic service pipes; requirements and test methods;
— prEN ZZZZZ-1, District cooling pipes – Design and installation of thermal insulated bonded single
2)
and 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
2)
and 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, design and test methods for straight lengths of factory made
thermally insulated pipe-in-pipe assemblies for directly buried district cooling distribution systems,
comprising a service pipe from DN 15 to DN 1200, rigid polyurethane foam insulation and a casing of
polyethylene. The pipe assembly may also include the following additional elements: measuring wires,
spacers and diffusion barriers.
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.
The design is based on an expected service life with continuous operation of a minimum 50 years.
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 10204, Metallic products – Types of inspection documents
EN 10216-1:2013, Seamless steel tubes for pressure purposes – Technical delivery conditions – Part 1:
Non-alloy steel tubes with specified room temperature properties
EN 10216-2, Seamless steel tubes for pressure purposes – Technical delivery conditions – Part 2: Non-alloy
and alloy steel tubes with specified elevated temperature properties
EN 10217-1:2019, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 1:
Electric welded and submerged arc welded non-alloy steel tubes with specified room temperature
properties
EN 10217-2, Welded steel tubes for pressure purposes – Technical delivery conditions – Part 2: Electric
welded non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10217-5, Welded steel tubes for pressure purposes – Technical delivery conditions – Part 5: Submerged
arc welded non-alloy and alloy steel tubes with specified elevated temperature properties
EN 10220, Seamless and welded steel tubes – Dimensions and masses per unit length
EN 12201-2, Plastics piping systems for water supply, and for drainage and sewerage under pressure –
Polyethylene (PE) – Part 2: Pipes
EN 12201-5:2011, Plastics piping systems for water supply, and for drainage and sewerage under
pressure – Polyethylene (PE) – Part 5: Fitness for purpose of the system
prEN UUUUU, District cooling pipes – Factory made bonded pipe systems for directly buried cold water
3
networks – Surveillance systems )
EN ISO 845, Cellular plastics and rubbers – Determination of apparent density (ISO 845:2006)

3) Under development (WI 00107076).
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EN ISO 1133-1, Plastics - Determination of the melt mass-flow rate (MFR) and melt volume-flow rate
(MVR) of thermoplastics - Part 1: Standard method (ISO 1133-1)
EN ISO 2505, Thermoplastics pipes – Longitudinal reversion – Test methods and parameters (ISO 2505)
EN ISO 3126, Plastics piping systems – Plastics components – Determination of dimensions (ISO 3126)
EN ISO 3127:2017, Thermoplastics pipes – Determination of resistance to external blows –
Round-the-clock method (ISO 3127:1994)
EN ISO 4590:2016, Rigid cellular plastics – Determination of the volume percentage of open cells and of
closed cells (ISO 4590)
EN ISO 6259-1, Thermoplastics pipes – Determination of tensile properties – Part 1: General test method
(ISO 6259-1)
EN ISO 6259-3, Thermoplastics pipes – Determination of tensile properties – Part 3: Polyolefin pipes
(ISO 6259-3)
EN ISO 8497:1996, Thermal insulation – Determination of steady-state thermal transmission properties of
thermal insulation for circular pipes (ISO 8497:1994)
EN ISO 8501-1:2007, Preparation of steel substrates before application of paints and related products –
Visual assessment of surface cleanliness – Part 1: Rust grades and preparation grades of uncoated steel
substrates and of steel substrates after overall removal of previous coatings (ISO 8501-1:2007)
EN ISO 9080, Plastics piping and ducting systems – Determination of the long-term hydrostatic strength of
thermoplastic materials in pipe form by extrapolation (ISO 9080)
EN ISO 9692-1, Welding and allied processes – Recommendations for joint preparation – Part 1: Manual
metal-arc welding, gas-shielded metal-arc welding, gas welding, TIG welding and beam welding of steels
(ISO 9692-1)
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 12162, Thermoplastics materials for pipes and fittings for pressure applications – Classification
and designation – Overall service (design) coefficient (ISO 12162)
EN ISO 844, Rigid cellular plastics – Determination of compression properties (ISO 844)
ISO 6964, Polyolefin pipes and fittings – Determination of carbon black content by calcination and
pyrolysis – Test method and basic specification
ISO 11414:2009, Plastics pipes and fittings - Preparation of polyethylene (PE) pipe/pipe or pipe/fitting
test piece assemblies by butt fusion
ISO 13953, Polyethylene (PE) pipes and fittings – Determination of the tensile strength and failure mode of
test pieces from a butt-fused joint
ISO 16770, Plastics – Determination of environmental stress cracking (ESC) of polyethylene – Full notch
creep test (FNCT)
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ISO 18553, Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin
pipes, fittings and compounds
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
batch
specified quantity of raw material made under the same uniform production conditions in one
production run by one manufacturer
3.2
bonded system
service pipe, insulating material and casing which are bonded by the insulating material
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
centre line deviation
deviation between the centre line of the service pipe and the centre line of the casing
3.5
continuous operating temperature
temperature at which the cold water network is designed to operate continuously
3.6
compressive creep
slow progressive strain under the influence of stresses caused by compressive forces
3.7
density
mass of a body of a material divided by the volume of the body
3.8
diffusion barrier
layer in the pipe assembly of another material than PE, installed between the thermal insulation and the
PE casing, with the aim to restrict the diffusion of gases through the casing
3.9
foam density
apparent density of the foam of the insulating layer at any position
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3.10
fusion compatibility
ability of two PE materials to be fused together to form a joint which conforms to the performance
requirements of this document
3.11
insulation material
material which reduces the heat loss
3.12
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
3.13
Polymeric Methylendiphenyl Diisocyanate-Index
MDI-index
quotient of the actual amount of isocyanate used and the stoichiometrically required amount,
multiplied by 100
3.14
physical blowing agent
additive in the mixture of isocyanate and polyole which evaporate without reacting during the
polymerisations
3.15
pipe assembly
assembled product, consisting of a service pipe, insulating material and a casing
3.16
polyurethane rigid foam
PUR
material resulting from the chemical reaction of polyisocyanates with hydroxyl containing compounds
in the presence of catalysts having mainly closed cell structure
Note 1 to entry: The foaming can be assisted by a physical blowing agent.
3.17
rework material
material to which reprocessable or recyclable material has been added
3.18
service life
span of time during which the pipeline is expected to function
3.19
service pipe
steel or plastic pipe that contains the water
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3.20
shear strength
ability of the pipe assembly to withstand a shear force acting between the casing and the service pipe
3.21
virgin material
material in a form such as granules that has not been subjected to use or processing other than that
required for its manufacture and to which no reprocessable or recyclable material has been added
4 Requirements
4.1 General
Unless otherwise specified, the requirements shall be valid for each single measurement.
For information on suitable guidelines for inspection of factory made pipe assemblies, see Annex A.
4.2 Service pipes
4.2.1 Steel service pipes
4.2.1.1 Specification
The technical delivery conditions of the steel service pipe shall be in accordance with Table 1.
Table 1 — Steel service pipe specification
Type of pipe Diameter EN standard Material
a
Seamless ≤ DN 300 EN 10216-1 P235TR1
Seamless All EN 10216-1 P235TR2
Seamless All EN 10216-2 P235GH
a
ERW ≤ DN 300 EN 10217-1 P235TR1
ERW All EN 10217-1 P235TR2
ERW All EN 10217-2 P235GH
SAW All EN 10217-5 P235GH
a
If P235TR1 material is used, an impact test at 0 °C, according to
EN 10216-1:2013, Table 5, or EN 10217-1:2019, Table 4, as specified for
P235TR2 shall be performed and specific inspection in accordance with
EN 10216-1 or EN 10217-1, Option 9 shall be carried out.
For the calculation of the yield strength R , at the design temperature in the temperature range up to
p0,2
30 °C, the value of R for room temperature shall be used for P235TR1, P235TR2 and P235GH.
p0,2
For higher steel grades than those given in Table 1 the yield strength is defined in their related
standards. If such higher steel grades are used for medium pipes, it shall be verified that all components
used in the involved part of the system are compatible to the higher yield strength of the pipes.
All steel pipes and components used for manufacturing of pipe assemblies under the scope of this
standard shall as a minimum be delivered to the manufacturer with an inspection certificate 3.1
according to EN 10204. The inspection certificate shall on request be passed on to the customer.
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In case a material related inspection certificate 3.1 according to EN 10204 is required by the client who
orders the factory made pipe assemblies, this request shall be given whilst placing the order with the
manufacturer of the factory made pipe assemblies.
NOTE Any later request for provision of such documentation can be too late and can possibly not be met by
the manufacturer, since the manufacturer has to organize the assignment of 3.1 certificates to pipes and part of
pipes before starting the production.
A length of pipe shall not include a circular weld.
ERW pipes supplied shall not include the welds used to join together the strip prior to forming.
4.2.1.2 Diameter
The diameter shall be in accordance with Table 2 which is derived from EN 10220.
The tolerances on the outside diameter, D , of the steel service pipe at the pipe ends, shall be in
s
accordance with the respective pipe standard as given in Table 1. Diameter measurements shall be
made using a circumferential tape. The diameter shall be calculated as the actual circumference divided
by π. Outside diameter, D , 168,3 and smaller may be measured using a slide calliper.
s
The out-of-roundness shall be determined in accordance with the respective pipe standard as given in
Table 1 and shall be within the limits given in these standards.
4.2.1.3 Wall thickness
The nominal wall thicknesses, T, and masses shall be in accordance with EN 10220 with a minimum as
indicated in Table 2.
Subject to design considerations, other wall thicknesses may be used, but in no case they shall be less
than the minima indicated in Table 2.
The tolerance on the actual wall thickness, T, of the steel service pipe shall be in accordance with the
respective pipe standard as given in Table 1.
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Table 2 — Steel service pipe dimensions
Nominal diameter Outside diameter Minimum nominal wall
thickness
DN D
s
T

mm
mm
15 21,3 2,0
20 26,9 2,0
25 33,7 2,3
32 42,4 2,6
40 48,3 2,6
50 60,3 2,9
65 76,1 2,9
80 88,9 3,2
100 114,3 3,6
125 139,7 3,6
150 168,3 4,0
200 219,1 4,5
250 273,0 5,0
300 323,9 5,6
350 355,6 5,6
400 406,4 6,3
450 457,0 6,3
500 508,0 6,3
600 610,0 7,1
700 711,0 8,0
800 813,0 8,8
900 914,0 10,0
1 000 1 016,0 11,0
1 200 1 219,0 12,5
4.2.1.4 Surface condition
In order to ensure proper bonding between the steel service pipe and the thermal insulation, the
following procedure shall be followed:
The outer surface of the pipe shall comply with rust grade A, B or C according to EN ISO 8501-1:2007,
without pitting.
Prior to insulation, the outer surface of the pipe shall be cleaned by a suitable method in accordance
with EN ISO 8501-1:2007, Clause 3, to ensure that it is free from rust, mill scale, oil, grease, dust, paint,
moisture and other contaminants.
It is recommended to clean the surface to Sa 2 according to EN ISO 8501-1:2007.
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4.2.2 Plastic service pipes
4.2.2.1 Specification
Plastics service pipes shall be polyethylene pipes PE 80 or PE 100 in accordance with EN 12201-2.
A length of pipe shall not include a circular joint.
4.2.2.2 Diameter
The nominal outside diameter and diameter tolerances of the plastic service pipe shall be in accordance
with EN 12201-2.
4.2.2.3 Wall thickness
The wall thickness of the plastic service pipe shall be in accordance with EN 12201-2 and the SDR
numbers given in Table 3.
Table 3 — SDR ratios required for different operating pressures
Operating pressure
bar
Service pipe
6 10 16 20 25
PE 100 SDR 21 SDR 13,6 SDR 9 SDR 7,4 SDR 6
PE 80 SDR 13,6 SDR 11 SDR 7,4 SDR 6 –
NOTE The SDR numbers given in Table 3 have been calculated for a continuous operating temperature of
30 °C and a service life of 50 years. Other temperature/time profiles can be applied in accordance with
EN ISO 13760 (Miner's Rule). Further information is given in Annex E.
Due to welding requirements, PE 100 and PE 80 shall not be combined in the same system.
The tolerance on the actual wall thickness of the plastic service pipe shall be in accordance with
EN 12201-2.
4.2.2.4 Surface condition
In order to ensure proper bonding between the plastic service pipe and the thermal insulation, the
following procedure shall be followed:
Prior to insulation, the outer surface of the pipe shall be cleaned so that it is free from, oil, grease, dust,
paint, moisture and other contaminants.
Surface treatment to improve the shear strength between the thermal insulation and plastic service
pipe is permissible provided that the treated pipe assembly still complies with the specification.
4.2.2.5 Oxygen tightness
2
The oxygen diffusion of service pipes shall not exceed 0,32 mg/m d at 40 °C when tested in accordance
with ISO 17455.
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4.3 Casing
4.3.1 Material properties
4.3.1.1 Material composition
The casing may be a separately manufactured pipe or be applied directly onto the insulation by
extrusion.
The casing material shall be black PE virgin compound or manufacturer’s own reprocessed PE in
accordance with 4.3.1.4 that does not include any PU insulation material or other materials, and
containing only those anti-oxidants, UV-stabilizers and carbon black necessary for the manufacture and
end use of pipes. The black coloured PE material to be extruded shall be classified at least a PE 80
material in accordance with EN ISO 12162.
The carbon black content shall, when tested in accordance with ISO 6964, be (2,0 to 2,5) % by mass.
NOTE The required carbon black content ensures UV stability for the service life.
The carbon black shall be finely dispersed in the material. When tested in accordance with ISO 18553 as
specified in 5.2.3, the following requirements shall be met:
— Carbon black agglomerates and particles shall be grade ≤ 3.
— Dispersion appearance rating not worse than A1, A2, A3 or B in ISO 18553.
4.3.1.2 Melt mass-flow rate
The melt mass-flow rate (MFR), in g/10 min, of black PE materials used for the manufacturing of
casings shall lie within 0,2 ≤ MFR ≤ 1,4 g/10 min determined in accordance with EN ISO 1133-1,
condition 5 kg, 190 °C.
Black coloured PE materials conforming to 4.3.1.1, which do not differ more than 0,5 g/10 min in MFR
shall be considered fusible to each other.
Casings made of PE materials outside this MFR range of 0,5 g/10 min may be fusion welded provided
that the pipe manufacturer has demonstrated fusion compatibility by preparing a butt fusion joint using
the parameters as specified in Annex A of ISO 11414:2009. The requirement of fusion compatibility is a
ductile failure mode of the joint when tested at 23 °C in accordance with ISO 13953.
4.3.1.3 Thermal stability
The thermal stability is determined by oxygen induction time (OIT) of the black coloured PE material
and shall be at least 20 min when tested at 210 °C according to EN ISO 11357-6.
4.3.1.4 Use of reprocessed material
Only clean, not degraded, reprocessed material, generated from the manufacturer's own production of
pipes that does not include any PU ins
...