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CEN

FprEN 448

(Main)

District heating pipes - Bonded single pipe systems for directly buried hot water networks - Factory made fitting assemblies of steel service pipes, polyurethane thermal insulation and a casing of polyethylene

District heating pipes - Bonded single pipe systems for directly buried hot water networks - Factory made fitting assemblies of steel service pipes, polyurethane thermal insulation and a casing of polyethylene

This document specifies requirements and test methods for factory made thermally insulated bonded fitting assemblies for hot water networks in accordance with EN 13941-1, comprising a steel service pipe, in most cases a steel fitting, polyurethane (PUR) foam thermal insulation and a casing of polyethylene.
The fitting assembly can also include the following additional elements: measuring wires, spacers and diffusion barriers.
This document specifies the characteristics of the following fitting assemblies:
-   bends, T-pieces, and reducers.
This document applies to fitting assemblies with a design pressure of at least 1,6 MPa.

Fernwärmerohre - Einrohr-Verbundsysteme für direkt erdverlegte Fernwärmenetze - Werkmäßig gefertigte Formstückbaueinheiten, bestehend aus Stahl-Mediumrohren, einer Wärmedämmung aus Polyurethan und einer Ummantelung aus Polyethylen

Dieses Dokument legt die Anforderungen und Prüfverfahren für werkmäßig gefertigte, wärmegedämmte Verbundformstücke für Fernwärmenetze in Übereinstimmung mit EN 13941 1 fest, die aus einem Stahl-Mediumrohr, in den meisten Fällen einer Stahlarmatur, einer Wärmedämmung aus Polyurethan-Schaum (PUR) und einer Ummantelung aus Polyethylen bestehen.
Das Verbundformstück kann darüber hinaus die folgenden zusätzlichen Bauteile umfassen: Messdrähte, Abstandhalter und Diffusionsbarrieren.
In diesem Dokument sind die Eigenschaften der folgenden Verbundformstücke festgelegt:
-   Bögen, T Stücke und Reduzierstücke.
Dieses Dokument gilt für Verbundformstücke mit einem Auslegungsdruck von mindestens 1,6 MPa.

Tuyaux de chauffage urbain - Systèmes bloqués monotubes pour les réseaux enterrés d'eau chaude pour des réseaux d'eau chaude enterrés directement - Assemblages de raccords manufacturés pour tubes de service en acier, isolation thermique en polyuréthane et tube de protection en polyéthylène

Le présent document spécifie les exigences et les méthodes d’essai applicables aux assemblages de raccords bloqués manufacturés isolés thermiquement pour les réseaux d’eau chaude, conformément à l’EN 13941-1, comprenant un tube de service en acier, dans la majorité des cas un raccord en acier, une isolation thermique en mousse de polyuréthane (PUR) et une protection en polyéthylène.
L’assemblage de raccord peut également comprendre les éléments supplémentaires suivants : câbles de mesure, entretoises et barrières anti-diffusion.
Le présent document couvre les assemblages de raccords suivants :
-   coude, té et réducteur.
Le présent document s’applique aux assemblages de raccords ayant une pression minimale de conception de 1,6 MPa.

Cevi za daljinsko ogrevanje - Poviti enocevni sistemi za neposredno vkopana vročevodna omrežja - Tovarniško izdelana armatura iz jeklenih delovnih cevi, obdanih s poliuretansko toplotno izolacijo in zaščitnim plaščem iz polietilena

General Information

Status
Not Published
Publication Date
19-Feb-2025
ICS
23.040.07 - Pipeline and its parts for district heat
23.040.45 - Plastics fittings
23.060.01 - Valves in general
Technical Committee
CEN/TC 107 - Pre-fabricated district heating pipe systems
Drafting Committee
CEN/TC 107/WG 5 - Fittings and valves
Current Stage
4599 - Dispatch of FV draft to CMC - Finalization for Vote
Start Date
22-Aug-2024
Due Date
23-Sep-2024
Completion Date
22-Aug-2024
Ref Project
oSIST prEN 448:2023 - District heating pipes - Bonded single pipe systems for directly buried hot water networks - Factory made fitting assemblies of steel service pipes, polyurethane thermal insulation and a casing of polyethylene

Relations

Revises
EN 448:2019 - District heating pipes - Bonded single pipe systems for directly buried hot water networks - Factory made fitting assemblies of steel service pipes, polyurethane thermal insulation and a casing of polyethylene
Effective Date
19-Jan-2023

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SLOVENSKI STANDARD
01-september-2023
Nadomešča:
SIST EN 448:2020
Cevi za daljinsko ogrevanje - Poviti enocevni sistemi za neposredno vkopana
vročevodna omrežja - Tovarniško izdelana armatura iz jeklenih delovnih cevi,
obdanih s poliuretansko toplotno izolacijo in zaščitnim plaščem iz polietilena
District heating pipes - Bonded single pipe systems for directly buried hot water networks
- Factory made fitting assemblies of steel service pipes, polyurethane thermal insulation
and a casing of polyethylene
Fernwärmerohre - Einrohr-Verbundsysteme für direkt erdverlegte Fernwärmenetze -
Werkmäßig gefertigte Formstückbaueinheiten, bestehend aus Stahl-Mediumrohren,
einer Wärmedämmung aus Polyurethan und einer Ummantelung aus Polyethylen
Tuyaux de chauffage urbain - Systèmes bloqués monotube pour les réseaux enterrés
d'eau chaude pour des réseaux d'eau chaude enterrés directement - Assemblages de
raccords manufacturés pour tubes de service en acier, isolation thermique en
polyuréthane et tube de protection en polyéthylène
Ta slovenski standard je istoveten z: prEN 448
ICS:
23.040.07 Cevovodi za daljinsko Pipeline and its parts for
ogrevanje in njihovi deli district heat
23.040.40 Kovinski fitingi Metal fittings
91.140.65 Oprema za ogrevanje vode Water heating equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 448
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2023
ICS 23.040.07; 23.060.01 Will supersede EN 448:2019
English Version
District heating pipes - Bonded single pipe systems for
directly buried hot water networks - Factory made fitting
assemblies of steel service pipes, polyurethane thermal
insulation and a casing of polyethylene
Tuyaux de chauffage urbain - Systèmes bloqués Fernwärmerohre - Einrohr-Verbundsysteme für direkt
monotubes pour des réseaux d'eau chaude enterrés erdverlegte Fernwärmenetze - Werkmäßig gefertigte
directement - Assemblages de raccords manufacturés Formstückbaueinheiten, bestehend aus Stahl-
pour tubes de service en acier, isolation thermique en Mediumrohren, einer Wärmedämmung aus
polyuréthane et tube de protection en polyéthylène Polyurethan und einer Ummantelung aus Polyethylen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 107.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 448:2023 E
worldwide for CEN national Members.

prEN 448:2023 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Requirements . 8
4.1 Steel parts . 8
4.1.1 Specification . 8
4.1.2 Wall thickness and diameter . 8
4.1.3 Bends . 8
4.1.4 T-pieces . 9
4.1.5 Reducers .10
4.1.6 Welding of steel parts .10
4.1.7 Surface condition .14
4.2 Casing .14
4.3 Polyurethane foam thermal insulation .14
4.4 Fitting assembly .14
4.4.1 General .14
4.4.2 Thermal insulation series .14
4.4.3 Fitting ends .14
4.4.4 Angle between casing segments of bend and minimum length .15

4.4.5 Polyethylene welding .15
4.4.6 Diameter and wall thickness of the casing .16
4.4.7 Minimum thickness of the thermal insulation in fitting assembly .17
4.4.8 Tolerances of the main fitting dimensions .17
4.4.9 Expected thermal life and long term temperature resistance .17
4.4.10 Thermal conductivity .17
4.4.11 Surface conditions at delivery .18
4.4.12 Measuring wires for surveillance system .18
5 Test methods .18
5.1 General .18
5.2 Test specimens .18
5.3 Steel parts .18
5.3.1 Leak-tightness test with water .18
5.3.2 Visual leak-tightness test by air with over pressure .19
5.3.3 Visual leak-tightness test by air with below atmospheric pressure.19
5.4 Casing .19
5.4.1 Visual testing of weld seams on casing .19
5.4.2 Bending test of weld seams on casing .22
5.5 Fitting assembly .23
5.5.1 Centre line deviation and angular deviation .23
5.5.2 Minimum thickness of the polyurethane foam thermal insulation .23
5.5.3 Thermal conductivity in unaged condition .23
prEN 448:2023 (E)
6 Marking . 24
6.1 General . 24
6.2 Steel service pipe . 24
6.3 Steel fittings . 24
6.4 Casing . 24
6.5 Fitting assembly . 24
Annex A (informative) Guidelines for inspection and testing . 26
A.1 General . 26
A.2 Manufacturer’s type test . 26
A.3 Manufacturer’s quality control . 26
A.4 Additional inspection . 26
A.5 Manufacturer’s responsibility . 26
Annex B (informative) Procedures for casing welding . 29
B.1 General . 29
B.2 Recommendations for site, machine and equipment . 29
B.3 Items . 29
B.4 Butt fusion welding . 30
B.4.1 Equipment . 30
B.4.2 Welding procedure . 31
B.5 Extrusion welding . 31
B.5.1 Equipment . 31
B.5.2 Welding procedure . 32
Annex C (informative) Waste treatment and recycling . 33
Bibliography . 34

prEN 448:2023 (E)
European foreword
This document (prEN 448:2023) 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 448:2019.
The main changes compared to the previous edition are listed below:
— two more ultrasonic testing methods for testing of welds are a
...

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