District heating pipes - Factory made flexible pipe systems - Part 2: Bonded system with plastic service pipes; requirements and test methods

This document specifies requirements and test methods for flexible, factory made, buried district heating pipe systems with plastic service pipes and bonding between the layers of the pipe assemblies.
It is only applicable in conjunction with part 1.
This document is applicable to pipes, fittings, their joints and to joints with components made of non-plastics materials intended to be used for district heating installations.
This document is applicable to a maximum operating temperature of 95 °C and maximum operating design pressure up to 1,0 MPa for a design service life of at least 30 years.
This document does not apply to cover surveillance systems.
NOTE   For higher temperatures or for the transport of other fluids, for example potable water, additional requirements and testing is needed. Such requirements are not specified in this document.

Fernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 2: Verbundrohrsysteme mit Mediumrohren aus Kunststoff; Anforderungen und Prüfungen

Dieses Dokument legt Anforderungen und Prüfverfahren für flexible, werkmäßig hergestellte, erdverlegte Fernwärmerohrsysteme mit Mediumrohren aus Kunststoff und Verbund zwischen den Schichten der Rohrbaugruppen fest.
Es ist nur in Verbindung mit Teil 1 anwendbar.
Dieses Dokument gilt für Rohre, Formstücke, ihre Verbindungen untereinander sowie mit Rohrleitungsteilen, deren Werkstoffe nicht aus Kunststoff bestehen und die für Fernwärmeinstallationen vorgesehen sind.
Dieses Dokument ist für eine maximale Betriebstemperatur von 95 °C und einen zulässigen Betriebsdruck bis einschließlich 1,0 MPa für eine Auslegungsnutzungsdauer von mindestens 30 Jahren anwendbar.
Dieses Dokument gilt nicht für Überwachungssysteme.
ANMERKUNG   Für höhere Temperaturen oder für den Transport anderer Flüssigkeiten, z. B. Trinkwasser, sind zusätzliche Anforderungen und Prüfungen erforderlich. Derartige Anforderungen sind in diesem Dokument nicht festgelegt.

Tuyaux de chauffage urbain - Systèmes de tuyaux flexibles manufacturés - Partie 2 : Système bloqué avec tubes de service en plastique ; exigences et méthodes d'essai

Le présent document spécifie les exigences et les méthodes d’essai relatives aux systèmes de tuyaux de chauffage urbain flexibles, manufacturés, enterrés, avec des tubes de service en plastique et une adhérence entre les couches des assemblages de tubes.
Il n'est utilisable que conjointement avec la partie 1.
Le présent document est applicable aux tuyaux, raccords, leurs joints, et aux joints avec des composants en matériaux non plastiques destinés à être utilisés pour les installations de chauffage urbain.
Le présent document est applicable à des températures maximales de service de 95 °C et des pressions de service maximales inférieures à 1,0 MPa, pour une durée de vie prévue d’au moins 30 ans.
Le présent document ne couvre pas les systèmes de surveillance.
NOTE   Pour les températures plus élevées ou pour le transport d’autres fluides, par exemple, de l’eau potable, des exigences et des essais supplémentaires sont nécessaires. Ces exigences ne sont pas spécifiées dans le présent document.

Cevi za daljinsko ogrevanje - Tovarniško izdelani gibki cevni sistemi - 2. del: Vezani cevni sistemi iz polimernih materialov - Zahteve in preskusne metode

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SLOVENSKI STANDARD
SIST EN 15632-2:2022
01-julij-2022
Nadomešča:
SIST EN 15632-2:2010+A1:2015
Cevi za daljinsko ogrevanje - Tovarniško izdelani gibki cevni sistemi - 2. del:
Vezani cevni sistemi iz polimernih materialov - Zahteve in preskusne metode

District heating pipes - Factory made flexible pipe systems - Part 2: Bonded system with

plastic service pipes; requirements and test methods
Fernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 2:
Verbundrohrsysteme mit Mediumrohren aus Kunststoff; Anforderungen und Prüfungen

Tuyaux de chauffage urbain - Système de tuyaux flexibles pré-isolés - Partie 2 : Système

bloqué avec tubes de service en plastique ; exigences et méthodes d'essai
Ta slovenski standard je istoveten z: EN 15632-2:2022
ICS:
23.040.07 Cevovodi za daljinsko Pipeline and its parts for
ogrevanje in njihovi deli district heat
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
SIST EN 15632-2:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 15632-2:2022
---------------------- Page: 2 ----------------------
SIST EN 15632-2:2022
EN 15632-2
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2022
EUROPÄISCHE NORM
ICS 23.040.07 Supersedes EN 15632-2:2010+A1:2014
English Version
District heating pipes - Factory made flexible pipe systems
- Part 2: Bonded system with plastic service pipes;
requirements and test methods

Tuyaux de chauffage urbain - Systèmes de tuyaux Fernwärmerohre - Werkmäßig gedämmte flexible

flexibles manufacturés - Partie 2 : Système bloqué avec Rohrsysteme - Teil 2: Verbundrohrsysteme mit

tubes de service en plastique ; exigences et méthodes Mediumrohren aus Kunststoff; Anforderungen und

d'essai Prüfungen
This European Standard was approved by CEN on 27 March 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15632-2:2022 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 15632-2:2022
EN 15632-2:2022 (E)
Contents Page

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

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

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

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

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

4 Classification ..................................................................................................................................................... 7

4.1 Operating temperatures and service life................................................................................................ 7

4.2 Design pressures ............................................................................................................................................. 7

5 Requirements ................................................................................................................................................... 8

5.1 General requirements ................................................................................................................................... 8

5.2 Service pipes, fittings and their connections ........................................................................................ 8

5.2.1 Quality of service pipes, fittings and their connections .................................................................... 8

5.2.2 Oxygen tightness of service pipes .......................................................................................................... 11

5.3 Axial shear strength of pipe assemblies .............................................................................................. 11

5.4 Linear water tightness of pipe assemblies .......................................................................................... 11

5.5 Water vapour permeation of pipe assemblies .................................................................................. 11

6 Test procedures ............................................................................................................................................ 11

6.1 General ............................................................................................................................................................. 11

6.2 Thermal cycling test .................................................................................................................................... 12

6.3 Axial shear strength of pipe assemblies .............................................................................................. 12

6.4 Linear water tightness of pipe assemblies .......................................................................................... 14

Annex A (informative) Application of Miner's Rule - Calculation of the calculated design life

of PB-H, PE-X and Multilayer piping systems ..................................................................................... 15

A.1 General ............................................................................................................................................................. 15

A.2 Considerations for multilayer piping systems .................................................................................. 17

Annex B (informative) Guideline for inspection and testing ..................................................................... 18

Bibliography ................................................................................................................................................................. 20

---------------------- Page: 4 ----------------------
SIST EN 15632-2:2022
EN 15632-2:2022 (E)
European foreword

This document (EN 15632-2:2022) has been prepared by Technical Committee CEN/TC 107

“Prefabricated district heating and district cooling pipe systems”, the secretariat of which is held by DS.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by November 2022, and conflicting national standards

shall be withdrawn at the latest by November 2022.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 15632-2:2010+A1:2014.

This document is one of a series of standards which form several parts of EN 15632, District heating

pipes — Factory made flexible pipe systems:
— Part 1: Classification, general requirements and test methods;

— Part 2: Bonded system with plastic service pipes; requirements and test methods;

— Part 3: Non bonded system with plastic service pipes; requirements and test methods;

— Part 4: Bonded system with metal service pipes; requirements and test methods.

In comparison with EN 15632-2:2010+A1:2014, the following changes have been made:

a) revised temperature profile in Clause 4 with explicitly stated (unchanged) safety factors;

b) introduction of an alternative option of thermal stability testing at 115 °C in 5.2;

c) improved specification of a service pipe according to EN ISO 21003 in 5.2;
d) completely revised informative Annex A “Application of Miner’s rule”;
e) completely revised “guideline for testing” in the informative Annex B.

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
---------------------- Page: 5 ----------------------
SIST EN 15632-2:2022
EN 15632-2:2022 (E)
Introduction

District heating technology has developed rapidly since its origin and especially in recent times. Today,

there are different generations of district heating networks. The technologies of these generations are

driven by the different heat sources and operating temperatures used.

CEN/TC 107 provides a set of European standard series for rigid and flexible piping systems in district

heating to suit all generations and requirements of district heating networks in the market.

The standard documents ensure quality for pre-fabricated piping systems in district heating.

This standard series covers flexible, pre-fabricated piping systems for operation conditions as described

in the scope of part 1.
---------------------- Page: 6 ----------------------
SIST EN 15632-2:2022
EN 15632-2:2022 (E)
1 Scope

This document specifies requirements and test methods for flexible, factory made, buried district

heating pipe systems with plastic service pipes and bonding between the layers of the pipe assemblies.

It is only applicable in conjunction with part 1.

This document is applicable to pipes, fittings, their joints and to joints with components made of non-

plastics materials intended to be used for district heating installations.

This document is applicable to a maximum operating temperature of 95 °C and maximum operating

design pressure up to 1,0 MPa for a design service life of at least 30 years.
This document does not apply to cover surveillance systems.

NOTE For higher temperatures or for the transport of other fluids, for example potable water, additional

requirements and testing is needed. Such requirements are not specified in this document.

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 485-2, Aluminium and aluminium alloys - Sheet, strip and plate - Part 2: Mechanical properties

EN 573-3, Aluminium and aluminium alloys - Chemical composition and form of wrought products -

Part 3: Chemical composition and form of products

EN 10025-2, Hot rolled products of structural steels - Part 2: Technical delivery conditions for non-alloy

structural steels

EN 10025-3, Hot rolled products of structural steels - Part 3: Technical delivery conditions for

normalized/normalized rolled weldable fine grain structural steels

EN 10025-4, Hot rolled products of structural steels - Part 4: Technical delivery conditions for

thermomechanical rolled weldable fine grain structural steels

EN 10216-1, 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 10216-3, Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 3: Alloy fine

grain steel tubes

EN 10217-1, 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 10217-3, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 3: Electric

welded and submerged arc welded alloy fine grain steel tubes with specified room, elevated and low

temperature properties
---------------------- Page: 7 ----------------------
SIST EN 15632-2:2022
EN 15632-2:2022 (E)

EN 15632-1, District heating pipes - Pre-insulated flexible pipe systems - Part 1: Classification, general

requirements and test methods

EN ISO 15875-1, Plastics piping systems for hot and cold water installations - Crosslinked polyethylene

(PE-X) - Part 1: General (ISO 15875-1)

EN ISO 15875-2, Plastics piping systems for hot and cold water installations - Crosslinked polyethylene

(PE-X) - Part 2: Pipes (ISO 15875-2)

EN ISO 15875-3, Plastics piping systems for hot and cold water installations - Crosslinked polyethylene

(PE-X) - Part 3: Fittings (ISO 15875-3)

EN ISO 15875-5, Plastics piping systems for hot and cold water installations - Crosslinked polyethylene

(PE-X) - Part 5: Fitness for purpose of the system (ISO 15875-5)

EN ISO 15876-1, Plastics piping systems for hot and cold water installations - Polybutene (PB) - Part 1:

General (ISO 15876-1)

EN ISO 15876-2, Plastics piping systems for hot and cold water installations - Polybutene (PB) - Part 2:

Pipes (ISO 15876-2)

EN ISO 15876-3, Plastics piping systems for hot and cold water installations - Polybutene (PB) - Part 3:

Fittings (ISO 15876-3)

EN ISO 15876-5, Plastics piping systems for hot and cold water installations - Polybutene (PB) - Part 5:

Fitness for purpose of the system (ISO 15876-5)

EN 17248, District heating and district cooling pipe systems - Terms and definitions

EN ISO 19893, Plastics piping systems - Thermoplastics pipes and fittings for hot and cold water - Test

method for the resistance of mounted assemblies to temperature cycling (ISO 19893)

EN ISO 21003-1, Multilayer piping systems for hot and cold water installations inside buildings - Part 1:

General (ISO 21003-1)

EN ISO 21003-2, Multilayer piping systems for hot and cold water installations inside buildings - Part 2:

Pipes (ISO 21003-2)

EN ISO 21003-3, Multilayer piping systems for hot and cold water installations inside buildings - Part 3:

Fittings (ISO 21003-3)

EN ISO 21003-5, Multilayer piping systems for hot and cold water installations inside buildings - Part 5:

Fitness for purpose of the system (ISO 21003-5)

EN ISO 22391 (all parts), Plastics piping systems for hot and cold water installations - Polyethylene of

raised temperature resistance (PE-RT) (ISO 22391)

ISO 17455, Plastics piping systems — Multilayer pipes — Determination of the oxygen permeability of the

barrier pipe
---------------------- Page: 8 ----------------------
SIST EN 15632-2:2022
EN 15632-2:2022 (E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 17248 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Classification
4.1 Operating temperatures and service life

Pipe systems according to this document are designed for a service life of at least 30 years when

operated at the following temperature profile DH (Table 1):
Table 1 — Temperature profile DH
Temperatures Duration
Operating Temperature (T )
80 °C 29 Years
90 °C 7 760 h
Maximum operating
temperature (T )
max
95 °C 1 000 h
Malfunction temperature (T )
100 °C 100 h
mal

NOTE The temperature profile DH of this document exceeds the requirements especially the thermal load of

other plastic piping system standards for conveyed medium water by far. This document requires a thermal

stability test at 110 °C of 15 000 h (see 5.2.1) in comparison to a thermal stability test at 110 °C of 8 760 h for hot

drinking water applications inside of buildings.

Other temperature/time profiles may be applied in accordance with EN ISO 13760 (Miner's Rule).

Further information is given in Annex A.
The maximum operating temperature shall not exceed 95 °C.
4.2 Design pressures

Pipe systems according to this document are designed for continuous operating pressures of 0,6 MPa,

0,8 MPa or 1,0 MPa.

Table 2 specifies the maximum SDR ratios of the service pipe required to withstand the operating

pressures.
---------------------- Page: 9 ----------------------
SIST EN 15632-2:2022
EN 15632-2:2022 (E)
Table 2 — SDR ratios required for different design pressures
Design Pressure
Service pipe 0,6 MPa 0,8 MPa 1,0 MPa
PE-X SDR 11 SDR 9 SDR 7,4
PB-H SDR 13,6 SDR 11 SDR 9
Multilayer M The construction shall meet the design pressure 0,6 MPa,
pipes 0,8 MPa or 1,0 MPa, as applicable, when tested according
to EN ISO 21003-2.

NOTE 1 The SDR ratios in Table 2 are based on the reference lines given in EN ISO 15875-1 and

EN ISO 15876-1, respectively.

The following minimum safety factors for design stress shall be applied (Table 3):

Table 3 — Safety factors for design stress
Temperature Safety factor
Temperature range
Operating Temperature (T )
1,5 ≤ 80 °C
Maximum operating temperature (T )
1,3 > 80 °C to ≤ 95 °C
max
Malfunction temperature (T )
1,0 > 95 °C to ≤ 100 °C
mal

The given temperature range defines the safety factors, which shall be applied for other

temperature / time profiles than Table 1 calculated in accordance with Annex A.

NOTE 2 These safety factors are identical with the overall service (design) coefficients given in

EN ISO 15875-2, EN ISO 15876-2 and EN ISO 21003-2, respectively.

NOTE 3 The column “Temperature range” of Table 3 shows the temperature ranges in which the relevant

safety factors are applied. This is of particular importance for the temperature profiles of Annex A, or for further

customized temperature profiles.
5 Requirements
5.1 General requirements

In addition to the general requirements specified in EN 15632-1 the following product specific

requirements shall apply.
5.2 Service pipes, fittings and their connections
5.2.1 Quality of service pipes, fittings and their connections
Service pipes, fittings and their connections shall comply with
...

SLOVENSKI STANDARD
oSIST prEN 15632-2:2021
01-januar-2021
Cevi za daljinsko ogrevanje - Tovarniško izdelani gibki cevni sistemi - 2. del:
Vezani cevni sistemi iz polimernih materialov - Zahteve in preskusne metode

District heating pipes - Factory made flexible pipe systems - Part 2: Bonded system with

plastic service pipes; requirements and test methods
Fernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 2:
Verbundrohrsysteme mit Mediumrohren aus Kunststoff; Anforderungen und Prüfungen

Tuyaux de chauffage urbain - Système de tuyaux flexibles pré-isolés - Partie 2 : Système

bloqué avec tubes de service en plastique ; exigences et méthodes d'essai
Ta slovenski standard je istoveten z: prEN 15632-2
ICS:
23.040.07 Cevovodi za daljinsko Pipeline and its parts for
ogrevanje in njihovi deli district heat
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
oSIST prEN 15632-2:2021 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN 15632-2:2021
---------------------- Page: 2 ----------------------
oSIST prEN 15632-2:2021
DRAFT
EUROPEAN STANDARD
prEN 15632-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2020
ICS 23.040.07 Will supersede EN 15632-2:2010+A1:2014
English Version
District heating pipes - Factory made flexible pipe systems
- Part 2: Bonded system with plastic service pipes;
requirements and test methods

Tuyaux de chauffage urbain - Système de tuyaux Fernwärmerohre - Werkmäßig gedämmte flexible

flexibles pré-isolés - Partie 2 : Système bloqué avec Rohrsysteme - Teil 2: Verbundrohrsysteme mit

tubes de service en plastique ; exigences et méthodes Mediumrohren aus Kunststoff; Anforderungen und

d'essai Prüfungen

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 107.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations

which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC

Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 15632-2:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 15632-2:2021
prEN 15632-2:2020 (E)
Contents Page

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

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

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

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

3 Terms and definitions ................................................................................................................................... 6

4 Classification ..................................................................................................................................................... 6

4.1 Operating temperatures and service life................................................................................................ 6

4.2 Design pressures ............................................................................................................................................. 6

5 Requirements ................................................................................................................................................... 7

5.1 General requirements ................................................................................................................................... 7

5.2 Service pipes, fittings and their connections ........................................................................................ 7

5.2.1 Quality of service pipes, fittings and their connections .................................................................... 7

5.2.2 Oxygen tightness of service pipes ............................................................................................................. 9

5.3 Axial shear strength of pipe assemblies ................................................................................................. 9

5.4 Linear water tightness of pipe assemblies .......................................................................................... 10

5.5 Water vapour permeation of pipe assemblies .................................................................................. 10

6 Test procedures ............................................................................................................................................ 10

6.1 General ............................................................................................................................................................. 10

6.2 Thermal cycling test .................................................................................................................................... 10

6.3 Axial shear strength of pipe assemblies .............................................................................................. 11

6.4 Linear water tightness of pipe assemblies .......................................................................................... 13

Annex A (informative) Application of Miner's Rule - Calculation of the calculated design life

of PB- PE-X and Multilayer piping systems ......................................................................................... 14

Annex B (informative) Guideline for testing ..................................................................................................... 17

Bibliography ................................................................................................................................................................. 19

---------------------- Page: 4 ----------------------
oSIST prEN 15632-2:2021
prEN 15632-2:2020 (E)
European foreword

This document (prEN 15632-2:2020) has been prepared by Technical Committee CEN/TC 107

“Prefabricated district heating and district cooling pipe system”, the secretariat of which is held by DS.

This document is currently submitted to the CEN Enquiry.
This document will supersede EN 15632-2:2010+A1:2014.

This document is one of a series of standards which form several parts of EN 15632, District heating

pipes — Factory made flexible pipe systems:
Part 1: Classification, general requirements and test methods;
Part 2: Bonded system with plastic service pipes; requirements and test methods;

Part 3: Non bonded system with plastic service pipes; requirements and test methods;

Part 4: Bonded system with metal service pipes; requirements and test methods.
In comparison to EN 15632-2:2010+A1:2014 the following changes have been made:

a) revised temperature profile in Clause 4 with explicitly stated (unchanged) safety factors;

b) introduction of an alternative option of thermal stability testing at 115 °C in 5.2;

c) improved specification of a service pipe according to EN ISO 21003 in 5.2;
d) completely revised informative Annex A “Application of Miner’s rule”;
e) completely revised “guideline for testing” in the informative Annex B.
---------------------- Page: 5 ----------------------
oSIST prEN 15632-2:2021
prEN 15632-2:2020 (E)
Introduction

Pre-insulated flexible bonded pipe systems with plastic service pipes are used in district and local

heating networks.

This part of the series of standards for the various types of flexible pipe systems is intended to be used

in connection with EN 15632-1 which specifies the basic design criteria for flexible district heating

pipes.
---------------------- Page: 6 ----------------------
oSIST prEN 15632-2:2021
prEN 15632-2:2020 (E)
1 Scope

This document provides requirements and test methods for flexible, factory made, buried heating pipe

systems with plastics service pipes and bonding between the layers of the pipe assemblies.

It shall be used in conjunction with part 1.

This document is valid for maximum operating temperatures of 95 °C and maximum operating design

pressures up to 1,0 MPa for a design service life of at least 30 years.
This document does not cover surveillance systems.

In conjunction with the other parts of EN 15632, this document is applicable to pipes, fittings, their

joints and to joints with components made of non-plastics materials intended to be used for district

heating installations.

NOTE For higher temperatures or for the transport of other fluids, for example potable water, additional

requirements and testing is needed. Such requirements are not specified in this document.

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 485-2, Aluminium and aluminium alloys — Sheet, strip and plate — Part 2: Mechanical properties

EN 573-3, Aluminium and aluminium alloys — Chemical composition and form of wrought products —

Part 3: Chemical composition and form of products

EN 15632-1, District heating pipes — Factory made flexible pipe systems — Part 1: Classification, general

requirements and test methods

EN ISO 15875-1, Plastics piping systems for hot and cold water installations — Crosslinked polyethylene

(PE-X) — Part 1: General (ISO 15875-1)

EN ISO 15875-2, Plastics piping systems for hot and cold water installations — Crosslinked polyethylene

(PE-X) — Part 2: Pipes (ISO 15875-2)

EN ISO 15875-3, Plastics piping systems for hot and cold water installations — Crosslinked polyethylene

(PE-X) — Part 3: Fittings (ISO 15875-3)

EN ISO 15875-5, Plastics piping systems for hot and cold water installations — Crosslinked polyethylene

(PE-X) — Part 5: Fitness for purpose of the system (ISO 15875-5)

EN ISO 15876-1, Plastics piping systems for hot and cold water installations — Polybutylene (PB) — Part

1: General (ISO 15876-1)

EN ISO 15876-2, Plastics piping systems for hot and cold water installations — Polybutylene (PB) — Part

2: Pipes (ISO 15876-2)

EN ISO 15876-3, Plastics piping systems for hot and cold water installations — Polybutylene (PB) — Part

3: Fittings (ISO 15876-3)

EN ISO 15876-5, Plastics piping systems for hot and cold water installations — Polybutylene (PB) — Part

5: Fitness for purpose of the system (ISO 15876-5)
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oSIST prEN 15632-2:2021
prEN 15632-2:2020 (E)

EN ISO 21003-2, Multilayer piping systems for hot and cold water installations inside buildings — Part 2:

Pipes (ISO 21003-2)

EN ISO 22391 (series), Plastics piping systems for hot and cold water installations — Polyethylene of

raised temperature resistance (PE-RT)

ISO 17455, Plastics piping systems — Multilayer pipes — Determination of the oxygen permeability of the

barrier pipe
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 17248 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Classification
4.1 Operating temperatures and service life

Pipe systems according to this document are designed for a service life of at least 30 years when

operated with the following temperature profile DH (Table 1):
Table 1 — Temperature profile DH
Temperatures Duration
Operating Temperature (T ) 80 °C 29 Years
Maximum operating 90 °C 7 760 h
temperature (T )
max
95 °C 1 000 h
Malfunction temperature (T ) 100 °C 100 h
mal

NOTE The temperature profile DH of this document exceeds the requirements especially the thermal load of

other plastic piping system standards for conveyed medium water by far. This document requires a thermal

stability test at 110 °C of 15 000 h (see 5.2.1) in comparison to a thermal stability test at 110 °C of 8 760 h for hot

drinking water applications inside of buildings.

Other temperature/time profiles can be applied in accordance with ISO 13760 (Miner's Rule). Further

information is given in Annex A.
The maximum operating temperature shall not exceed 95 °C.
4.2 Design pressures

Pipe systems according to this document are designed for continuous operating pressures of 0,6 MPa,

0,8 MPa or 1,0 MPa.

Table 2 defines the maximum SDR ratios of the service pipe required to withstand the operating

pressures.
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oSIST prEN 15632-2:2021
prEN 15632-2:2020 (E)
Table 2 — SDR ratios required for different design pressures
Design Pressure
Service 0,6 MPa 0,8 MPa 1,0 MPa
pipe
PE-X SDR 11 SDR 9 SDR 7,4
PB-H SDR 13,6 SDR 11 SDR 9
Multilayer Wall thicknesses shall be calculated according to
M-pipes the methods defined in EN ISO 21003-2

NOTE 1 The SDR ratios in Table 2 are based on the reference lines given in EN ISO 15875-1 and

EN ISO 15876-1, respectively.

The following minimum safety factors for design stress shall be applied (Table 3):

Table 3 — Safety factors for design stress
Temperature Safety factor Temperature range
Operating Temperature (T ) 1,5 ≤ 80 °C
Maximum operating temperature 1,3 > 80 °C to ≤ 95 °C
(T )
max
Malfunction temperature (T ) 1,0 > 95 °C to ≤ 100 °C
mal

NOTE 2 These safety factors are identical with the overall service (design) coefficients given in

EN ISO 15875-2, EN ISO 15876-2 and EN ISO 21003-2, respectively.
5 Requirements
5.1 General requirements

In addition to the general requirements defined in EN 15632-1 the following product specific

requirements shall apply.
5.2 Service pipes, fittings and their connections
5.2.1 Quality of service pipes, fittings and their connections
Service pipes, fittings and their connections shall comply with:

— EN ISO 15875-1, EN ISO 15875-2, EN ISO 15875-3, EN ISO 15875-5, for service pipes made of

crosslinked polyethylene (PE-X).

The EN ISO 15875 standards series consisting of part 1, 2 3 and 5 is a piping system standard.

The documents shall only be used in conjunction with all the other parts of EN ISO 15875. The

EN ISO 15875-1 is of general importance. Pipes conforming to EN ISO 15875-2 are intended to be

joined with fittings conforming to EN ISO 15875-3, whereby the connection conforms to the

requirements of EN ISO 15875-5.
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oSIST prEN 15632-2:2021
prEN 15632-2:2020 (E)

NOTE 1 The test results obtained from a specific piping system test according EN ISO 15875-5 cannot be

transferred to other combinations of pipes and fittings.

All requirements of the pipe and fitting according to EN ISO 15875-2 and EN ISO 15875-3 especially

the degree of cross-linking shall be met before leaving the production site.

— Deviating from EN ISO 15875-2, the thermal stability test on service pipes shall be carried out

as follows:

— pipes shall not fail when tested at 110 °C at a hoop stress of 2,4 N/mm for 15 000 h;

— alternatively, pipes shall not fail when tested at 115 °C at a hoop stress of 2,1 N/mm for

8 760 h;

— in case of dispute, the result of the thermal stability test at 110 °C applies.

— Deviating from EN ISO 15875-5, the thermal cycling test on service pipes and fittings shall be

carried out with test parameters specified in 6.2.

— EN ISO 15876-1, EN ISO 15876-2, EN ISO 15876-3, EN ISO 15876-5, for service pipes made of

polybutylene (PB-H).

The EN ISO 15876 standards series consisting of part 1, 2 3 and 5 is a piping system standard.

The documents shall only be used in conjunction with all the other parts of EN ISO 1587

...

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