prEN 489-2
(Main)District heating pipes - Factory made flexible pipe systems - Joint casing systems
District heating pipes - Factory made flexible pipe systems - Joint casing systems
This document specifies requirements and test methods for joint casing systems for factory made flexible pipe systems with a plastic service pipe in accordance with standard series EN 15632 1 to -3, EN 17878 1 to -3 or EN 17414 1 to -3, as applicable.
Requirements of joint casing systems for EN 15632-4 are not covered by this document, but by EN 489 1.
Fernwärmerohre - Werkseitig gedämmte flexible Rohrsysteme - Teil 2: Mantelrohrverbindungssysteme
Dieses Dokument legt Anforderungen und Prüfverfahren fest für Mantelrohrverbindungssysteme (zwischen benachbarten werkmäßig hergestellten Rohren und/oder Formstücken und/oder Armaturenbaugruppen) für werkmäßig hergestellte vorgedämmte flexible Rohrsysteme mit einem Kunststoff-Mediumrohr nach entweder der Normenreihe EN 15632 1 [1] bis EN 15632 3 [2], EN 17878 1 [3] bis EN 17878 3 [4], EN 17414 1 [5] bis EN 17414 3 [6] oder CEN/TS 17889 [7].
Es gilt nicht für starre Rohrsysteme nach EN 253 [8].
Die Installation des Rohrsystems nach den oben genannten Systemnormen ist eine Voraussetzung für die Anwendung eines in diesem Dokument festgelegten Mantelrohrverbindungssystems.
Anforderungen an Mantelrohrverbindungssysteme nach EN 15632 4 [9] werden nicht in diesem Dokument behandelt, sondern in EN 489 1 [10].
Tuyaux de chauffage urbain - Systèmes de tuyaux flexibles manufacturés - Systèmes de protection de l'assemblage
Le présent document spécifie les exigences et les méthodes d'essai pour les systèmes de protection de l’assemblage (entre tuyaux et/ou raccords et/ou robinets préisolés adjacents manufacturés) pour les systèmes de tuyaux flexibles préisolés manufacturés avec un tube de service en plastique conformément à l'une ou l'autre des séries de normes EN EN 15632-1[1] à EN 15632-3[2] , EN 17878-1[3] à EN 17878- 3[4] , EN 17414-1[5] à EN 17414-3[6] ou CEN/TS 17889[7].
Il ne s'applique pas aux systèmes de tuyaux rigides conformes à l’EN 253[8].
L'installation du système de tuyaux conformément aux normes de système mentionnées ci-dessus est une condition préalable à l'application d'un système de protection de l’assemblage spécifié par le présent document.
Les exigences relatives aux systèmes de protection de l’assemblage pour l’EN 15632-4[9] ne sont pas couvertes par le présent document, mais par l'EN 489-1[10].
Cevi za daljinsko ogrevanje - Tovarniško izdelani gibki cevni sistemi - Spojeni cevni sistemi
General Information
- Status
- Not Published
- Publication Date
- 24-Mar-2027
- Technical Committee
- CEN/TC 107 - Pre-fabricated district heating pipe systems
- Drafting Committee
- CEN/TC 107/WG 10 - Flexible pipe systems for district heating
- Current Stage
- 4020 - Submission to enquiry - Enquiry
- Start Date
- 06-Nov-2025
- Due Date
- 06-Nov-2025
- Completion Date
- 06-Nov-2025
Overview
The prEN 489-2 standard, developed by CEN/TC 107, specifies the requirements and test methods for joint casing systems used in factory-made flexible district heating pipe systems with plastic service pipes. It applies to joint casing systems connecting adjacent pipes, fittings, or valve assemblies compliant with EN 15632-1 to -3, EN 17878-1 to -3, or EN 17414-1 to -3 series standards. This standard does not cover joint casing systems for rigid pipes (EN 253) or those under EN 15632-4, which fall under EN 489-1.
The document ensures that joint casing systems maintain structural integrity, leak tightness, and adequate thermal insulation, essential for efficient and durable district heating networks. It provides installation guidance, performance criteria, and standardized testing procedures to support quality and reliability in joint casing assemblies.
Key Topics
Scope and Applicability: Focuses on flexible factory-made pipe systems with plastic service pipes; excludes rigid systems and specific joint casing systems covered by other standards.
Installation Instructions: Emphasizes detailed and clear manufacturer guidance, covering storage, environmental conditions, tool requirements, surface preparation, foam quality assessment, and foam quantity for on-site insulated joints.
Requirements:
- Resistance to External Loads: Must comply with ring stiffness and impact resistance values as per EN 15632-1.
- Leak Tightness: Joint casing systems shall withstand leak tightness tests ensuring zero water ingress.
- Thermal Insulation: Insulation thickness must be no less than 50% of the connected pipe insulation and never less than 15 mm, with water absorption in accordance to EN 15632-1.
- Use of Rework Material: Allowed only if product quality remains uncompromised.
- Plugs and Closures: On-site foamed casing systems require secure sealed or welded plugs that pass relevant leak tightness and mechanical requirements.
Test Methods:
- Preparation of test specimens follows manufacturer’s installation instructions.
- Leak tightness testing involves immersion in a water tank under constant pressure (30 ± 1 kPa) for 24 hours with colorant added to detect water ingress.
- Multiple configurations (straight, T-branch, elbow) must be tested across the full manufacturing range.
Quality Control and Testing:
- Manufacturer type testing verifies materials and production methods.
- Ongoing quality control ensures product consistency.
- Additional inspection reinforces manufacturer accountability through sampling and extended checks.
Applications
prEN 489-2 is essential for manufacturers, installers, and operators in the district heating sector focused on flexible pipe systems with plastic service pipes. Its rigorous requirements for joint casing systems help to:
- Extend the service life of district heating networks by ensuring joints are durable and thermally efficient.
- Minimize energy losses through strict insulation standards at pipe joints.
- Prevent leakages that can lead to costly repairs and system downtime.
- Guide proper installation practices to maintain system performance.
- Support compliance with European normative frameworks, facilitating trade and interoperability across member states.
This standard serves as a foundation for sustainable and reliable district heating infrastructure, contributing to energy efficiency and environmental protection.
Related Standards
- EN 15632-1 to -3: General requirements and test methods for flexible pipe systems with plastic service pipes.
- EN 17878-1 to -3: Standards for factory-made flexible pipe systems with lower temperature profiles.
- EN 17414-1 to -3: Related series for district cooling flexible pipe systems.
- EN 489-1: Covers joint casing systems for bonded pipe systems under EN 15632-4.
- EN 253: Rigid pre-insulated bonded pipe systems for buried hot water networks.
- EN 17248: Terms and definitions for district heating and cooling pipe systems.
Understanding these related documents alongside prEN 489-2 helps stakeholders ensure comprehensive compliance and robust design of district heating pipe networks.
Keywords: district heating pipes, flexible pipe systems, joint casing systems, plastic service pipe, thermal insulation, leak tightness, external load resistance, pipe joint testing, factory-made pipe systems, CEN standards, EN 15632, EN 489-2, pipe system installation.
Frequently Asked Questions
prEN 489-2 is a draft published by the European Committee for Standardization (CEN). Its full title is "District heating pipes - Factory made flexible pipe systems - Joint casing systems". This standard covers: This document specifies requirements and test methods for joint casing systems for factory made flexible pipe systems with a plastic service pipe in accordance with standard series EN 15632 1 to -3, EN 17878 1 to -3 or EN 17414 1 to -3, as applicable. Requirements of joint casing systems for EN 15632-4 are not covered by this document, but by EN 489 1.
This document specifies requirements and test methods for joint casing systems for factory made flexible pipe systems with a plastic service pipe in accordance with standard series EN 15632 1 to -3, EN 17878 1 to -3 or EN 17414 1 to -3, as applicable. Requirements of joint casing systems for EN 15632-4 are not covered by this document, but by EN 489 1.
prEN 489-2 is classified under the following ICS (International Classification for Standards) categories: 23.040.07 - Pipeline and its parts for district heat; 23.040.60 - Flanges, couplings and joints. The ICS classification helps identify the subject area and facilitates finding related standards.
prEN 489-2 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-januar-2026
Cevi za daljinsko ogrevanje - Tovarniško izdelani gibki cevni sistemi - Spojeni
cevni sistemi
District heating pipes - Factory made flexible pipe systems - Joint casing systems
Fernwärmerohre - Werkseitig gedämmte flexible Rohrsysteme - Teil 2:
Mantelrohrverbindungssysteme
Tuyaux de chauffage urbain - Systèmes de tuyaux flexibles manufacturés - Systèmes de
protection de l'assemblage
Ta slovenski standard je istoveten z: prEN 489-2
ICS:
23.040.07 Cevovodi za daljinsko Pipeline and its parts for
ogrevanje in njihovi deli district heat
23.040.60 Prirobnice, oglavki in spojni Flanges, couplings and joints
elementi
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
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2025
ICS 23.040.07; 23.040.60
English Version
District heating pipes - Factory made flexible pipe systems
- Joint casing systems
Tuyaux de chauffage urbain - Systèmes de tuyaux Fernwärmerohre - Werkseitig gedämmte flexible
flexibles manufacturés - Systèmes de protection de Rohrsysteme - Teil 2: Mantelrohrverbindungssysteme
l'assemblage
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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 489-2:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Requirements . 4
4.1 General . 4
4.2 Installation instruction . 5
4.3 Resistance to external loads . 5
4.4 Leak tightness . 5
4.5 Thermal insulation . 5
4.5.1 General . 5
4.5.2 Minimum thickness of the thermal insulation . 5
4.5.3 Water absorption . 5
4.6 Use of rework material for the joint casing . 6
4.7 Plugs and closures for joint casing system to be foamed on-site . 6
4.7.1 General . 6
4.7.2 Sealed plugs . 6
4.7.3 Welded plugs . 6
5 Test methods . 6
5.1 Preparation of test specimen . 6
5.2 Leak tightness test . 6
5.2.1 General . 6
5.2.2 Water tank . 6
5.2.3 Test specimen . 6
5.2.4 Test instructions . 7
Annex A (informative) Overview of joint casing systems . 8
Annex B (informative) Guideline for testing . 9
B.1 General . 9
B.2 Manufacturer's type test . 9
B.3 Manufacturer’s quality control . 9
B.4 Additional inspection . 9
Bibliography . 10
European foreword
This document (prEN 489-2:2025) has been prepared by Technical Committee CEN/TC 107 "District
heating and cooling systems", the secretariat of which is held by DS.
This document is currently submitted to the CEN Enquiry.
1 Scope
This document spècifiès requirements and test methods for joint casing systems (between adjacent
factory made pipe, and/or fitting and/or valve assemblies) for factory made pre-insulated flèxiblè pipe
systems with a plastic service pipe in accordance with either standard series EN EN 15632-1[1] to EN
15632-3[2] , EN 17878-1[3] to EN 17878-3[4] , EN 17414-1[5] to EN 17414-3[6] or CEN/TS 17889[7].
It does not apply to rigid pipe systems according to EN 253[8].
The installation of the pipe system according to the system standards mentioned above is a precondition
for the application of a joint casing system spècifièd by this document.
Requirements of joint casing systems for EN 15632-4[9] are not covered by this document, but by EN
489-1[10] .
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 17248:2019, District heating and district cooling pipe systems - Terms and definitions
3 Terms and definitions
For the purposes of this document, the following terms an
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...