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 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 can 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.

Fernkälterohre - Einrohr-Verbundsysteme für direkt erdverlegte Fernkältenetze - Teil 1: Werkmäßig gefertigtes Verbundrohrsystem, bestehend aus Stahl oder Kunststoff-Mediumrohr, Polyurethan-Wärmedämmung und einem Außenmantel aus Polyethylen

Dieses Dokument legt die Anforderungen, Auslegung und Prüfverfahren für gerade Abschnitte von werkmäßig gefertigten, wärmegedämmten Rohr-in-Rohr-Systemen für direkt erdverlegte Fernkältenetzwerke fest, bestehend aus einem Mediumrohr von DN 15 bis DN 1 200, einer starren Polyurethan-Hartschaumstoffwärmedämmung und einem Polyethylenmantel. Das Rohrsystem kann darüber hinaus die folgenden zusätzlichen Bauteile umfassen: Messdrähte, Abstandhalter und Diffusionsbarrieren.
Dieses Dokument ist nur anzuwenden für gedämmte Rohrsysteme, für den Dauerbetrieb mit Wasser bei verschiedenen Temperaturen (1 °C bis 30 °C) und einem Betriebsdruck von höchstens 25 bar.
Die Auslegung basiert auf einer erwarteten Lebensdauer von mindestens 50 Jahren bei Dauerbetrieb.

Réseaux d'eau glacée - Systèmes bloqués de tuyaux pour les réseaux d'eau glacée enterrés directement - Partie 1 : Assemblage de tube de service en acier ou en matière plastique, isolation thermique en polyuréthane et protection en polyéthylène

Le présent document spécifie les exigences, la conception et les méthodes d’essai pour des longueurs droites d’assemblages de conduite à double enveloppe préisolée thermiquement pour les réseaux de distribution d’eau glacée urbains enterrés directement, constitués d’un tube de service de DN 15 à DN 1200, d’une isolation en mousse de polyuréthane rigide et d’un tube de protection en polyéthylène. Le tuyau préisolé peut également comprendre les éléments supplémentaires suivants : les câbles de mesure, les entretoises et les barrières anti diffusion.
Ce document ne concerne que les assemblages de tubes isolés, destinés à un usage continu avec de l’eau à diverses températures (de 1 °C à 30 °C) et à une pression de service maximale de 25 bar.
La conception est fondée sur une durée utile prévue en fonctionnement continu d’au moins 50 ans.

Cevi za daljinsko hlajenje - Vezani enocevni sistemi za neposredno vkopana hladnovodna omrežja - 1. del: Tovarniško izdelan cevni sestav iz delovne cevi iz jekla ali polimernih materialov, poliuretanske toplotne izolacije in polietilenskega plašča

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6060 - Definitive text made available (DAV) - Publishing
Due Date
29-Jul-2020
Completion Date
29-Jul-2020

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SLOVENSKI STANDARD
SIST EN 17415-1:2020
01-oktober-2020
Cevi za daljinsko hlajenje - Vezani enocevni sistemi za neposredno vkopana
hladnovodna omrežja - 1. del: Tovarniško izdelan cevni sestav iz delovne cevi iz

jekla ali polimernih materialov, 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: EN 17415-1:2020
ICS:
23.040.99 Drugi sestavni deli za Other pipeline components
cevovode
SIST EN 17415-1:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 17415-1:2020
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SIST EN 17415-1:2020
EN 17415-1
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2020
EUROPÄISCHE NORM
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

pour les réseaux d'eau glacée enterrés directement - direkt erdverlegte Fernkältenetze - Teil 1: Werkmäßig

Partie 1 : Assemblage de 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 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 17415-1:2020 E

worldwide for CEN national Members.
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SIST EN 17415-1:2020
EN 17415-1:2020 (E)
Contents Page

European foreword ...................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 7

4 Requirements ................................................................................................................................................... 7

4.1 General................................................................................................................................................................ 7

4.2 Service pipes ..................................................................................................................................................... 7

4.3 Casing ................................................................................................................................................................ 11

4.4 Polyurethane (PUR) foam thermal insulation.................................................................................... 13

4.5 Pipe assembly ................................................................................................................................................. 14

5 Test methods .................................................................................................................................................. 19

5.1 General conditions and test specimens ................................................................................................ 19

5.2 Casing ................................................................................................................................................................ 20

5.3 Polyurethane (PUR) foam thermal insulation.................................................................................... 22

5.4 Pipe assembly ................................................................................................................................................. 24

6 Marking ............................................................................................................................................................ 27

6.1 General.............................................................................................................................................................. 27

6.2 Service pipe ..................................................................................................................................................... 28

6.3 Casing ................................................................................................................................................................ 28

6.4 Pipe assembly ................................................................................................................................................. 28

Annex A (informative) Guidelines for inspection and testing ................................................................... 29

Annex B (normative) Thermal conductivity of factory made pipe assemblies – Test

procedure ........................................................................................................................................................ 33

Annex C (informative) Waste treatment and recycling ................................................................................ 38

Annex D (informative) Application of Miner's Rule ...................................................................................... 39

Bibliography ................................................................................................................................................................. 42

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SIST EN 17415-1:2020
EN 17415-1:2020 (E)
European foreword

This document (EN 17415-1:2020) 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 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.
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SIST EN 17415-1:2020
EN 17415-1:2020 (E)
Introduction

Factory made bonded single 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 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

and a casing of polyethylene ;

— Part 3: Factory made steel valve assembly for steel or plastic service pipe, polyurethane thermal

insulation and a casing of polyethylene
The other standards from CEN/TC 107 covering this subject are:

— EN 17414-1, District cooling pipes - Factory made flexible pipe systems - Part 1: Classification, general

requirements and test methods;

— EN 17414-2, District cooling pipes - Factory made flexible pipe systems - Part 2: Bonded system with

plastic service pipes - Requirements and test methods;

— EN 17414-3, District cooling pipes - Factory made flexible pipe systems - Part 3: Non bonded system

with plastic service pipes - Requirements and test methods;

— EN ZZZZZ-1, District cooling pipes – Design and installation of thermal insulated bonded single and

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

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.
Waste management and recycling of materials is dealt with in Annex C.
Under development.
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SIST EN 17415-1:2020
EN 17415-1:2020 (E)
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 can 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, Plastics piping systems for water supply, and for drainage and sewerage under pressure —

Polyethylene (PE) — Part 5: Fitness for purpose of the system

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 17414-2, District cooling pipes — Factory made flexible pipe systems — Part 2: Bonded system with

plastic service pipes - Requirements and test methods

EN ISO 844, Rigid cellular plastics — Determination of compression properties (ISO 844)

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SIST EN 17415-1:2020
EN 17415-1:2020 (E)

EN ISO 845, Cellular plastics and rubbers — Determination of apparent density (ISO 845)

EN ISO 1133 (all parts), Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow

rate (MVR) of thermoplastics (ISO 1133 series)

EN ISO 2505, Thermoplastics pipes — Longitudinal reversion — Test method 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, 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 8501-1, 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)

EN ISO 9080, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength

of thermoplastics materials in pipe form by extrapolation (ISO 9080)

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,

designation and design coefficient (ISO 12162)

ISO 6964, Polyolefin pipes and fittings — Determination of carbon black content by calcination and

pyrolysis — Test method

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)

ISO 18553, Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin

pipes, fittings and compounds
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SIST EN 17415-1:2020
EN 17415-1:2020 (E)
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
foam density
apparent density of the foam of the insulating layer at any position
3.2
insulation material
material which reduces the heat loss
3.3
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
3.4
pipe assembly

assembled product, consisting of at least one service pipe, insulating material and casing

3.5
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
4 Requirements
4.1 General

Unless otherwise specified, the requirements shall be valid for each single measurement.

For information on suitable guidelines for inspection, 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.

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SIST EN 17415-1:2020
EN 17415-1:2020 (E)
Table 1 — Steel service pipe specification
Type of pipe Diameter EN standard Material
Seamless ≤ DN 300 EN 10216-1 P235TR1
Seamless All EN 10216-1 P235TR2
Seamless All EN 10216-2 P235GH
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
Equivalent or higher steel grades according to approved European
standards may be used by agreement.
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

document 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 client who orders

the pipe assemblies.

In case a material related inspection certificate 3.1 according to EN 10204 is required by the client who

orders the pipe assemblies, this request shall be given whilst placing the order with the manufacturer of

the pipe assemblies.

NOTE Any later request for provision of such documentation could be too late and possibly can't 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

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 mm and smaller may be measured using a slide calliper.

The out-of-roundness shall be determined in accordance with the respective pipe standard as given in

Table 1.
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SIST EN 17415-1:2020
EN 17415-1:2020 (E)
4.2.1.3 Wall thickness

The 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 tolerances on the wall thickness of the steel service pipe shall be in accordance with the respective

pipe standard as given in Table 1.
Table 2 — Steel service pipe dimensions
Nominal diameter Outside diameter Minimum nominal wall
thickness
DN d
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:
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SIST EN 17415-1:2020
EN 17415-1:2020 (E)

a) Prior to thermal insulation, the outer surface of the pipe shall be cleaned so that it is free from rust,

mill scale, oil, grease, dust, paint, moisture and other contaminants.

b) Before cleaning the steel service pipe, the outer surface shall comply with rust grade A, B or C

according to EN ISO 8501-1, without pitting.
It is recommended to clean the surface to Sa 2 according to EN ISO 8501-1.
4.2.1.5 Pipe ends

All steel service pipes used for manufacturing of pipe assemblies shall be delivered with pipe ends

prepared for welding. For this, the relevant order option in accordance with the respective pipe

standard as given in Table 1 shall be agreed.
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,
or alternatively,

— PP, PB, PE-X, PE-RT or multilayer plastics service pipes in accordance with the respective pipe

standard as given in EN 17414-2.
A length of pipe shall not include a circular joint.
4.2.2.2 Diameter

The nominal outside diameter and diameter tolerances of the PE plastic service pipe shall be in

accordance with EN 12201-2.

The nominal outside diameter and diameter tolerances of the PP, PB, PE-X, PE-RT and multilayer

plastics service pipe shall be in accordance with the respective pipe standard as given in EN 17414-2.

4.2.2.3 Wall thickness

The wall thickness of the PE plastic service pipe shall be in accordance with EN 12201-2.

Table 3 defines the maximum SDR ratios of the service pipe required to withstand different operating

pressures.
Table 3 — Maximum SDR ratios for different operating pressures
Operating pressure
bar
Service pipe
6 10 16 20 25
PE 100 21 13,6 9 7,4 6
PE 80 17 11 7,4 6 –

NOTE The maximum SDR numbers given in Table 3 have been calculated based on EN ISO 15494 with the

safety factor 1,25 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 D.

Due to welding requirements, PE 100 and PE 80 shall not be combined in the same system.

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SIST EN 17415-1:2020
EN 17415-1:2020 (E)

The tolerance on the actual wall thickness of the PE plastic service pipe shall be in accordance with

EN 12201-2.

The wall thickness and the tolerance on the actual wall thickness of the PP, PB, PE-X, PE-RT and

multilayer plastics service pipe shall be in accordance with the respective pipe standard as given in

EN 17414-2. The SDR numbers for the PP, PB, PE-X, PE-RT and multilayer plastics service pipes shall be

in accordance with EN 17414-2.
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.

4.3 Casing
4.3.1 Material properties
4.3.1.1 Material composition

The casing material shall be black coloured PE virgin or rework material containing only those anti-

oxidants, UV-stabilizers and carbon black necessary for the manufacture and use of pipe assemblies to

this specification. The black coloured PE material to be extruded shall be tested in accordance with

EN ISO 9080 and classified at least a PE 80 material in accordance with EN ISO 12162.

The casing may be a separately manufactured pipe or be applied directly onto the PUR thermal

insulation by extrusion.

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 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 or A3 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 ≤ 1,0 g/10 min determined in accordance with EN ISO 1133 (all

parts), 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 if fusion

compatibility has been demonstrated by the manufacturer of the pipe assembly. This shall be done by

preparing a butt fusion joint using the parameters as specified in ISO 11414:2009, Annex A. The

requirement of fusion compatibility is a ductile failure mode of the joint when tested at 23 °C in

accordance with ISO 13953.
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SIST EN 17415-1:2020
EN 17415-1:2020 (E)
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 rework material

Only clean, not degraded, rework material, generated from the manufacturer's own production of pipes

that does not include any PU insulation material shall be used.
4.3.2 Casing properties
4.3.2.1 Nominal outside diameter
The nominal outside diameter of the casing should be selected from Table 4.
The actual outside diameter shall be measured in accordance with EN ISO 3126.
4.3.2.2 Wall thickness

The wall thickness of the casing shall be in accordance with Table 4. When the casing includes a

diffusion barrier, the wall thickness of one single PE layer of the casing shall be in accordance with

Table 4.
The actual wall thickness shall be measured in accordance with EN ISO 3126.
Table 4 — Casing dimensions
Nominal outside Minimum wall thickness
diameter
min
75 3,0
90 3,0
110 3,0
125 3,0
140 3,0
160 3,0
180 3,0
200 3,2
225 3,4
250 3,6
280 3,9
315 4,1
355 4,5
400 4,8
450 5,2
500 5,6
560 6,0
630 6,6
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SIST EN 17415-1:2020
EN 17415-1:2020 (E)
Nominal outside Minimum wall thickness
diameter
min
710 7,2
800 7,9
900 8,7
1 000 9,4
1 100 10,2
1 200 11,0
1 400 12,5
4.3.2.3 Appearance, surface finish, casing ends

The internal and external surfaces of the casing shall be clean and free from such grooving or othe

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