District heating pipes - Factory made flexible pipe systems - Part 3: Non bonded system with plastic service pipes; requirements and test methods

This document provides requirements and test methods for flexible, factory made, buried district heating pipes systems with plastic service pipes and no bonding between the layers of the pipe assemblies.
It shall be used in conjunction with part 1.
This document is valid for maximum operating temperature of 95 °C and maximum operating design pressure up to 1,0 MPa for a design lifetime 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.

Fernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 3: Nicht-Verbund-Rohrsysteme mit Mediumrohren aus Kunststoff; Anforderungen und Prüfungen

Dieses Dokument enthält Anforderungen und Prüfverfahren für flexible, werkmäßig hergestellte, erdverlegte Fernwärmerohrsysteme mit Mediumrohren aus Kunststoff ohne Verbund zwischen den Schichten der Rohrbaugruppen.
Es muss in Verbindung mit Teil 1 verwendet werden.
Dieses Dokument gilt für eine maximale Betriebstemperatur von 95 °C und einen zulässigen Betriebsdruck bis einschließlich 1,0 MPa für eine Auslegungslebensdauer von mindestens 30 Jahren.
Dieses Dokument gilt nicht für Überwachungssysteme.
Zusammen mit den anderen Teilen von EN 15632 gilt dieses Dokument für Rohre, Formstücke, ihre Verbindungen untereinander sowie mit Rohrleitungsteilen, deren Werkstoffe nicht aus Kunststoff bestehen und die für Fernwärmeinstallationen vorgesehen sind.
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 3 : Système non bloqué avec tubes de service en plastique ; exigences et méthodes d'essai

Le présent document fournit 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 sans adhérence entre les couches des assemblages de tubes.
Il doit être utilisé conjointement avec la partie 1.
Le présent document s’applique 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.
Le présent document s’applique conjointement avec les autres parties de l’EN 15632 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.
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 - 3. del: Nevezani cevni sistemi iz polimernih materialov - Zahteve in preskusne metode

Ta dokument določa zahteve in preskusne metode za tovarniško izdelane gibke podzemne cevne sisteme za daljinsko ogrevanje z delovnimi cevmi iz polimernih materialov, pri katerih sloji niso vezani.
Uporabljati ga je treba skupaj s 1. delom.
Ta dokument se uporablja za najvišjo obratovalno temperaturo 95 °C in najvišji konstrukcijski obratovalni tlak do 1,0 MPa za predvideno življenjsko dobo vsaj 30 let.
Ta dokument ne zajema nadzornih sistemov.
Ta dokument se v povezavi z drugimi deli standarda EN 15632 uporablja za cevi, fitinge, njihove spoje ter spoje s komponentami iz nepolimernih materialov, namenjene uporabi v napeljavah za daljinsko ogrevanje.
OPOMBA:   Za višje temperature ali prevoz drugih tekočin, na primer pitne vode, so potrebni dodatne zahteve in preskusi. Take zahteve niso določene v tem dokumentu.

General Information

Status
Published
Public Enquiry End Date
31-Jan-2021
Publication Date
22-May-2022
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
19-May-2022
Due Date
24-Jul-2022
Completion Date
23-May-2022

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SLOVENSKI STANDARD
SIST EN 15632-3:2022
01-julij-2022
Nadomešča:
SIST EN 15632-3:2010+A1:2015
Cevi za daljinsko ogrevanje - Tovarniško izdelani gibki cevni sistemi - 3. del:
Nevezani cevni sistemi iz polimernih materialov - Zahteve in preskusne metode

District heating pipes - Factory made flexible pipe systems - Part 3: Non bonded system

with plastic service pipes; requirements and test methods

Fernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 3: Nicht-Verbund-

Rohrsysteme mit Mediumrohren aus Kunststoff; Anforderungen und Prüfungen

Tuyaux de chauffage urbain - Systèmes de tuyaux flexibles manufacturés - Partie 3 :

Système non bloqué avec tubes de service en plastique ; exigences et méthodes d'essai

Ta slovenski standard je istoveten z: EN 15632-3:2022
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 15632-3:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 15632-3:2022
---------------------- Page: 2 ----------------------
SIST EN 15632-3:2022
EN 15632-3
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2022
EUROPÄISCHE NORM
ICS 23.040.07 Supersedes EN 15632-3:2010+A1:2014
English Version
District heating pipes - Factory made flexible pipe systems
- Part 3: Non bonded system with plastic service pipes;
requirements and test methods

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

flexibles manufacturés - Partie 3 : Système non bloqué Rohrsysteme - Teil 3: Nicht-Verbund-Rohrsysteme mit

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

méthodes 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 15632-3:2022 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 15632-3:2022
EN 15632-3:2022 (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 Sealing in linear direction of pipe assemblies ................................................................................... 11

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

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

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

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

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

of PB-H, PE-X and Multilayer piping systems ..................................................................................... 13

A.1 General ............................................................................................................................................................. 13

A.2 Considerations for multilayer piping systems .................................................................................. 15

Annex B (informative) Guideline for inspection and testing ..................................................................... 16

Bibliography ................................................................................................................................................................. 18

---------------------- Page: 4 ----------------------
SIST EN 15632-3:2022
EN 15632-3:2022 (E)
European foreword

This document (EN 15632-3:2022) 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 15632-3:2010+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 15632-3:2010+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 15632-3:2022
EN 15632-3:2022 (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 15632-3:2022
EN 15632-3:2022 (E)
1 Scope

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

heating pipe systems with plastic service pipes and no 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 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 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

---------------------- Page: 7 ----------------------
SIST EN 15632-3:2022
EN 15632-3:2022 (E)

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

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 15632-3:2022
EN 15632-3:2022 (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 15632-3:2022
EN 15632-3:2022 (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
pipes 0,6 MPa, 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 str
...

SLOVENSKI STANDARD
oSIST prEN 15632-3:2021
01-januar-2021
Cevi za daljinsko ogrevanje - Tovarniško izdelani gibki cevni sistemi - 3. del:
Nevezani cevni sistemi iz polimernih materialov - Zahteve in preskusne metode

District heating pipes - Factory made flexible pipe systems - Part 3: Non bonded system

with plastic service pipes; requirements and test methods

Fernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 3: Nicht-Verbund-

Rohrsysteme mit Mediumrohren aus Kunststoff; Anforderungen und Prüfungen
Tuyaux de chauffage urbain - Systèmes de tuyaux flexibles préisolés - Partie 3 :

Système non bloqué avec tubes de service en plastique ; exigences et méthodes d'essai

Ta slovenski standard je istoveten z: prEN 15632-3
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 15632-3:2021 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN 15632-3:2021
---------------------- Page: 2 ----------------------
oSIST prEN 15632-3:2021
DRAFT
EUROPEAN STANDARD
prEN 15632-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2020
ICS 23.040.07 Will supersede EN 15632-3:2010+A1:2014
English Version
District heating pipes - Factory made flexible pipe systems
- Part 3: Non bonded system with plastic service pipes;
requirements and test methods

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

flexibles préisolés - Partie 3 : Système non bloqué avec Rohrsysteme - Teil 3: Nicht-Verbund-Rohrsysteme 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 15632-3:2020 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 15632-3:2021
prEN 15632-3:2020 (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 Sealing in linear direction of pipe assemblies ...................................................................................... 9

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

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

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

6.2 Temperature cycle test .............................................................................................................................. 10

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

of PB- PE-X and Multilayer piping systems ......................................................................................... 11

Annex B (informative) Guideline for testing ..................................................................................................... 14

Bibliography ................................................................................................................................................................. 16

---------------------- Page: 4 ----------------------
oSIST prEN 15632-3:2021
prEN 15632-3:2020 (E)
European foreword

This document (prEN 15632-3:2020) 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 15632-3:2010+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 15632-3:2021
prEN 15632-3:2020 (E)
Introduction

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

local heating networks.

This part of the series of standards for the various types of flexible pipe systems shall be used in

connection with EN 15632-1 where the basic design criteria for flexible district heating pipes are

specified.
---------------------- Page: 6 ----------------------
oSIST prEN 15632-3:2021
prEN 15632-3:2020 (E)
1 Scope

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

heating pipes systems with plastic service pipes and no bonding between the layers of the pipe

assemblies.
It shall be used in conjunction with part 1.

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

pressure up to 1,0 MPa for a design lifetime 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 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 15632-1, District heating pipes — Factory made flexible pipe systems — Part 1: Classification, general

requirements and test methods

EN 15632-2, District heating pipes — Factory made flexible pipe systems — Part 2: Bonded system with

plastic service pipes; requirements and test methods

EN ISO 13760, Plastics pipes for the conveyance of fluids under pressure — Miner’s rule — Calculation

method for cumulative damage (ISO 13760)

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)
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oSIST prEN 15632-3:2021
prEN 15632-3:2020 (E)

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)

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 at 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 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.
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oSIST prEN 15632-3:2021
prEN 15632-3:2020 (E)

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

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 Wall thicknesses shall be calculated according to
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
...

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