oSIST prEN 17878-3:2022

SLOVENSKI STANDARD
oSIST prEN 17878-3:2022
01-september-2022
Cevi za daljinsko ogrevanje - Tovarniško izdelani gibki cevni sistemi z nižjim
temperaturnim profilom - 3. del: Nevezani cevni sistemi iz polimernih materialov -
Zahteve in preskusne metode
District heating pipes - Flexible pipe systems with a lower temperature profile - Part 3:
Non bonded system with plastic service pipes; requirements and test methods
Fernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme mit einem niedrigeren
Temperaturprofil - Teil 3: Nicht-Verbund-Rohrsysteme mit Mediumrohren aus Kunststoff;
Anforderungen und Prüfungen
Tuyaux de chauffage urbain - Système 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 17878-3
ICS:
23.040.07 Cevovodi za daljinsko Pipeline and its parts for
ogrevanje in njihovi deli district heat
23.040.20 Cevi iz polimernih materialov Plastics pipes
oSIST prEN 17878-3:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 17878-3:2022

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oSIST prEN 17878-3:2022


DRAFT
EUROPEAN STANDARD
prEN 17878-3
NORME EUROPÉENNE

EUROPÄISCHE NORM

July 2022
ICS 23.040.07
English Version

District heating pipes - Flexible pipe systems with a lower
temperature profile - Part 3: Non bonded system with
plastic service pipes; requirements and test methods
Tuyaux de chauffage urbain - Système de tuyaux Fernwärmerohre - Werkmäßig gedämmte flexible
flexibles préisolés - Partie 3: Système non bloqué avec Rohrsysteme mit einem niedrigeren Temperaturprofil
tubes de service en plastique, exigences et méthodes - Teil 3: Nicht-Verbund-Rohrsysteme mit
d'essai Mediumrohren aus Kunststoff; Anforderungen und
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, Türkiye 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17878-3:2022 E
worldwide for CEN national Members.

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oSIST prEN 17878-3:2022
prEN 17878-3:2022 (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 . 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 . 10
5.3 Sealing in linear direction of pipe assemblies . 10
5.4 Water vapour permeation of pipe assemblies . 11
6 Test procedures . 11
6.1 General . 11
6.2 Thermal cycling test . 11
Annex A (informative) Application of Miner's Rule - Calculation of the calculated design life
of PE-RT Type II, PB-H, PE-X and Multilayer piping systems . 12
A.1 General . 12
A.2 Considerations for multilayer piping systems . 14
Annex B (informative) Guidelines for inspection and testing . 15
Bibliography . 17


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oSIST prEN 17878-3:2022
prEN 17878-3:2022 (E)
European foreword
This document (prEN 17878-3:2022) 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 document is currently submitted to the CEN enquiry.
This document will be a new standard under the group of standards within Factory made flexible pipe
This document is part of the standard series EN 17878, District heating pipes — Factory made flexible pipe
systems with a lower temperature profile:
— 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.
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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.
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1 Scope
This document specifies 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 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 80 °C and maximum operating
design pressure up to 1,0 MPa for a design service life of at least 50 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
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
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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
prEN 17878-1:2022, District heating pipes — Factory made flexible pipe systems with a lower temperature
profile — Part 1: Classification, general requirements and test methods
EN ISO 15875 (all parts), Plastics piping systems for hot and cold water installations — Crosslinked
polyethylene (PE-X) (ISO 15875)
EN ISO 15876 (all parts), Plastics piping systems for hot and cold water installations — Polybutylene (PB)
(ISO 15876)
EN 17248, District heating and district cooling pipe systems - Terms and definitions
EN ISO 21003 (all parts), Multilayer piping systems for hot and cold water installations inside buildings
(ISO 21003-1)
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
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 2 according to Table 1:
Table 1 — Temperature profile DH 2
 Temperature Duration

°C
Operating Temperature (T ) 70 29 Years
op
Maximum operating temperature (T ) 80 1 year
max
Malfunction temperature (T ) 95 100 h
mal
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NOTE Temperature profile DH 2 is equal to Application profile 2 according to ISO 10508.
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 80 °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 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-RT Type II SDR 11 SDR 9 SDR 7,4
PE-X SDR 11 SDR 9 SDR 7,4
a
PB-H SDR 13,6 SDR 13,6 SDR 11
Multilayer M pipes The construction shall meet the design pressure
0,6 MPa, 0,8 MPa or 1,0 MPa, as applicable, when
tested according to EN ISO 21003-2
a calculated value is SDR 17, but practical use requires SDR 13,6.
NOTE 1 The SDR ratios in Table 2 are based on the reference lines given in EN ISO 22391-1, 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

°C
Operating Temperature (T ) 1,5 ≤ 70
op
Maximum operating temperature (T ) 1,3 > 70 to ≤ 80
max
Malfunction temperature (T ) 1,0 > 80 to ≤ 95
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 22391-2,
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.
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5 Requirements
5.1 General requirements
In addition to the general requirements specified in prEN 17878-1:2022 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 one of the following standard series, as
applicable: EN ISO 22391 series or EN ISO 15875 series or EN ISO 15876 series or EN ISO 21003 series.
The respective details to comply with are as follows:
— EN ISO 22391-1, EN ISO 22391-2, EN ISO 22391-3, EN ISO 22391-5, for service pipes made of
Polyethylene raised temperature (PE-RT Type II).
The EN ISO 22391 standards series consisting of part 1, 2, 3 and 5 is a piping system standard.
EN ISO 22391-1 is of general importance. Pipes conforming to EN ISO 22391-2 are intended to be
joined with fittings conforming to EN ISO 22391-3, whereby the connec
...