SIST-TP CEN/TR 18341:2026
(Main)District heating and cooling systems - Supplementary information on usage of CEN/TC 107 documents
General Information
- Abstract
This document provides an overview of the standardization deliverables published and under development under the responsibility of CEN/TC 107. It defines the temperature ranges applicable to the intended use of these documents and establishes a classification system linking each document to its corresponding temperature range. Furthermore, it describes how estimation of service life of pipe systems is conducted based on the average operating temperature within service pipes, taking into account additional influencing conditions.
- Status
- Not Published
- Public Enquiry End Date
- 19-Apr-2026
- Technical Committee
- I13 - Imaginarni 13
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 09-Jul-2026
- Due Date
- 13-Sep-2026
Overview
SIST-TP CEN/TR 18341:2026 is a technical report that provides essential supplementary information for interpreting and applying CEN/TC 107 documents related to district heating and district cooling systems. Developed by the Slovenian Institute for Standardization (SIST) and under the purview of CEN/TC 107, this guide serves as a crucial reference for professionals managing polymeric and metallic pipe systems designed for district networks. The document outlines the structure of existing and developing standardization deliverables, defines temperature ranges for appropriate application, and introduces a classification system that links each deliverable to its relevant temperature range. Additionally, it describes factors impacting the service life estimation of pipe systems depending on the average operating temperature and other influencing operational conditions.
Key Topics
Standardization Deliverables
- Overview of CEN/TC 107 documents: Summarizes both published and in-development European Standards (EN), Technical Specifications (TS), and Technical Reports (TR) for district heating and cooling pipelines.
- Classification System: Establishes a method to categorize each document by its applicable temperature range to ensure correct application.
- Pipe Systems Types:
- Rigid pipe systems (single and twin pipe)
- Flexible pipe systems (bonded, non-bonded, thermoplastic reinforced)
- Service pipe materials: steel, plastic, and thermoplastic-reinforced pipes
Temperature Ranges
- Defined application ranges (TR1 to TR5): Ensures that each CEN/TC 107 standard is applicable to the specific design and operational boundaries, supporting both high-temperature district heating and low-temperature district cooling networks.
- Importance of operating temperature: Impacts stress, material performance, and overall system durability.
Service Life Assessment
- Estimation Methodologies: Presents how service life is determined based on average operating temperature, maximum design/peak temperature, and includes additional guidance on assessing life expectancy for both metallic and polymer pipes.
- Quality and Operation Factors: Emphasizes the role of adherence to standards, qualified personnel, and maintenance practices in achieving projected service life.
Applications
District Heating
CEN/TR 18341:2026 guides the application of standards for pipelines distributing hot water and steam in urban heating schemes. Major benefits include:
- System Design Optimization: Assists in selecting suitable pipe types and materials based on temperature class and operational needs.
- Enhanced Service Life: Ensures correct specification and operation to maximize pipeline and system longevity.
- Regulatory Compliance: Simplifies navigation of the standardization landscape for designers, engineers, and operators in district energy projects.
District Cooling
For cooling networks, the technical report clarifies:
- Selection of Components: Distinguishes standards for cold water network distribution systems, focusing on temperature-appropriate product selection.
- Installation Best Practices: Guidance helps mitigate risks due to temperature differentials that can stress materials and pipe structures.
Flexibility and Expansion
- Accommodating New Technologies: Expands to include flexible pipe systems and supports new low-temperature network developments.
- Joint Development: Aligns with international standards (ISO/TC 341) under the Vienna Agreement, making it relevant for cross-border projects.
Related Standards
CEN/TR 18341:2026 references and explains the use of foundational European standards related to district heating and cooling, including:
- EN 17248 - Terms and definitions
- EN 13941 series - Design and installation of thermal-insulated pipe systems
- EN 14419 - Surveillance systems for district heating pipes
- EN 253, EN 15698 series, EN 15632 series, EN 17415, EN 17414, EN 17878 - Specifications for steel, plastic, and flexible pre-insulated pipe systems
- EN 488, EN 489 - Joint casing and valve assemblies
- EN ISO 13760 - Service life estimation using cumulative damage calculation
- CEN/TS 17889 - Technical specifications for thermoplastic-reinforced service pipes
For a complete list, users should consult the full report and applicable standards catalogues.
Conclusion
SIST-TP CEN/TR 18341:2026 streamlines the application of CEN/TC 107 documents across the district heating and cooling sector, ensuring optimal standards usage for safe, efficient, and long-lasting pipe system operation. It is an essential resource for network designers, engineers, and operators seeking to align with best practices in Europe's evolving energy infrastructure.
Relations
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
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Frequently Asked Questions
SIST-TP CEN/TR 18341:2026 is a draft published by the Slovenian Institute for Standardization (SIST). Its full title is "District heating and cooling systems - Supplementary information on usage of CEN/TC 107 documents". This standard covers: This document provides an overview of the standardization deliverables published and under development under the responsibility of CEN/TC 107. It defines the temperature ranges applicable to the intended use of these documents and establishes a classification system linking each document to its corresponding temperature range. Furthermore, it describes how estimation of service life of pipe systems is conducted based on the average operating temperature within service pipes, taking into account additional influencing conditions.
This document provides an overview of the standardization deliverables published and under development under the responsibility of CEN/TC 107. It defines the temperature ranges applicable to the intended use of these documents and establishes a classification system linking each document to its corresponding temperature range. Furthermore, it describes how estimation of service life of pipe systems is conducted based on the average operating temperature within service pipes, taking into account additional influencing conditions.
SIST-TP CEN/TR 18341:2026 is classified under the following ICS (International Classification for Standards) categories: 23.040.07 - Pipeline and its parts for district heat; 23.040.99 - Other pipeline components. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST-TP CEN/TR 18341:2026 has the following relationships with other standards: It is inter standard links to SIST EN ISO 17829:2025, SIST EN ISO 17831-1:2025, SIST EN ISO 17831-2:2025, SIST EN ISO 17225-8:2023. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
SIST-TP CEN/TR 18341:2026 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
kSIST-TP FprCEN/TR 18341:2026
01-april-2026
Sistemi daljinskega ogrevanja in hlajenja - Dodatne informacije o uporabi
dokumentov CEN/TC 107
District heating and cooling systems - Supplementary information on usage of CEN/TC
107 documents
Fernwärme- und Fernkälteverteilsysteme - Ergänzende Information zur Anwendung der
Dokumente des CEN/TC 107 "Fernwärme- und Fernkältesysteme"
Ta slovenski standard je istoveten z: FprCEN/TR 18341
ICS:
23.040.07 Cevovodi za daljinsko Pipeline and its parts for
ogrevanje in njihovi deli district heat
kSIST-TP FprCEN/TR 18341:2026 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
kSIST-TP FprCEN/TR 18341:2026
kSIST-TP FprCEN/TR 18341:2026
FINAL DRAFT
TECHNICAL REPORT
FprCEN/TR 18341
RAPPORT TECHNIQUE
TECHNISCHER REPORT
February 2026
ICS 23.040.07; 23.040.99
English Version
District heating and cooling systems - Supplementary
information on usage of CEN/TC 107 documents
Fernwärme- und Fernkälteverteilsysteme -
Ergänzende Information zur Anwendung der
Dokumente des CEN/TC 107 "Fernwärme- und
Fernkältesysteme"
This draft Technical Report is submitted to CEN members for Vote. It has been drawn up by the Technical Committee CEN/TC
107.
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 Technical Report. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a Technical Report.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprCEN/TR 18341:2026 E
worldwide for CEN national Members.
kSIST-TP FprCEN/TR 18341:2026
FprCEN/TR 18341 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Structure of standardization deliverables . 5
4.1 General . 5
4.2 Terminology in district heating and cooling pipe systems . 6
4.3 Surveillance systems . 6
4.4 Design and installation of thermal insulated rigid and flexible pipe systems . 7
4.5 Joint casing assemblies . 7
4.6 Qualification testing of fitter and PE-welder . 7
4.7 Bonded rigid single pipe systems for directly buried hot water networks . 7
4.8 Bonded rigid twin pipe systems for directly buried hot water networks . 7
4.9 Bonded rigid single pipe systems for directly buried cold water networks . 7
4.10 Factory-made flexible pipe systems for district heating . 7
4.11 Factory-made flexible pipe systems for district cooling . 8
5 Temperature ranges . 8
6 Service life . 10
Bibliography . 12
kSIST-TP FprCEN/TR 18341:2026
FprCEN/TR 18341 (E)
European foreword
This document (FprCEN/TR 18341:2026) 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 Vote on TR.
kSIST-TP FprCEN/TR 18341:2026
FprCEN/TR 18341 (E)
Introduction
CEN/TC 107 is responsible for the development, revision, and adaptation of standardization
deliverables within the domain of district heating and cooling systems. These deliverables include
European Standards (EN), Technical Specificätions (TS), and Technical Reports (TR). Since the
publication of its first standard, EN 253, in 1990, the committee has produced more than 26 deliverables
addressing various aspects of the sector.
In 2023, the scope of CEN/TC 107 was expanded to address emerging requirements in district heating
and cooling, with particular attention to system optimization, environmental considerations, and sector
coupling. This expansion also aligns with the activities of ISO/TC 341, thereby facilitating opportunities
for joint development of standards under the framework of the Vienna Agreement.
Given the growing number of deliverables, there is a recognized need to provide clear guidance to users
regarding the availability and applicability of standards, technical specificätions, and technical reports
for district heating and cooling pipes, including the conditions under which these documents are used.
kSIST-TP FprCEN/TR 18341:2026
FprCEN/TR 18341 (E)
1 Scope
This document provides an overview of the standardization deliverables published and under
development under the responsibility of CEN/TC 107. It defines the temperature ranges applicable to
the intended use of these documents and establishes a clässificätion system linking each document to
its corresponding temperature range. Furthermore, it describes how estimation of service life of pipe
systems is conducted based on the average operating temperature within service pipes, taking into
account additional influencing conditions.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Structure of standardization deliverables
4.1 General
Figure 1 illustrates the standardization deliverables published and currently under development by
CEN/TC 107. It further indicates:
— which deliverables are of a superordinate nature and therefore generally applicable;
— the deliverables applicable to district heating pipelines and those applicable to district cooling
pipelines;
— the deliverables relevant to rigid pipe systems and those relevant to flexible pipe systems.
kSIST-TP FprCEN/TR 18341:2026
FprCEN/TR 18341 (E)
Key
WI work item
EN European standard
TS technical specificätion
SPS single pipe systems
TPS twin pipe systems
Figure 1 — Structure of standardization deliverables under the scope of CEN/TC 107
4.2 Terminology in district heating and cooling pipe systems
EN 17248 [1] provides a comprehensive set of terms and definitions related to district heating and
district cooling pipe systems. It serves as a reference to ensure consistent and clear communication
within the industry.
4.3 Surveillance systems
EN 14419 [2] specifies the requirements and installation of surveillance systems to monitor and
maintain the integrity of the district heating infrastructure.
kSIST-TP FprCEN/TR 18341:2026
FprCEN/TR 18341 (E)
4.4 Design and installation of thermal insulated rigid and flexible pipe systems
The EN 13941 series [3] provides requirements for the design and installation of directly buried bonded
pipe systems in district heating networks. EN 13941-1 [4] defines design principles, while EN 13941-2
[5] specifies installation practices.
NOTE Information on district cooling is being integrated into the current revision process.
4.5 Joint casing assemblies
The EN 489 series [6] provides specificätions for joint casing systems in district heating and cooling
applications. EN 489-1 [7] defines requirements for joint casing assemblies and thermal insulation in
bonded pipe systems, while prEN 489-2 [8] specifies joint casing systems for factory-made flexible
pipe systems.
4.6 Qualification testing of fitter and PE-welder
The prEN 18213 series [9] establishes quälificätion requirements for personnel involved in the
installation of bonded single and twin pipe systems used in directly buried hot and cold water
networks, with prEN 18213-1 [10] specifying the procedures and criteria for the quälificätion testing
of fitters, prEN 18213-2 [11] defining the requirements for the quälificätion testing of polyethylene
(PE) welders.
4.7 Bonded rigid single pipe systems for directly buried hot water networks
These are a category of standards providing specificätions for bonded single pipe systems in directly
buried district heating networks. EN 253 [12] defines requirements for factory-made pipe assemblies
with steel service pipes, polyurethane insulation, and a polyethylene casing. EN 448 [13] specifies fitting
assemblies, EN 488-1 [14] covers shut-off valve assemblies, and EN 488-2 [15] defines service valve
assemblies.
4.8 Bonded rigid twin pipe systems for directly buried hot water networks
The EN 15698 series [16] provides specificätions for bonded twin pipe systems in directly buried district
heating networks. EN 15698-1 [17] defines requirements for factory-made twin pipe assemblies with
steel service pipes, polyurethane insulation, and a polyethylene casing, while EN 15698-2 [18] specifies
fitting and valve assemblies with the same construction.
4.9 Bonded rigid single pipe systems for directly buried cold water networks
The EN 17415 series [19] specifies requirements for factory-made components used in bonded single
pipe systems for directly buried cold water networks in district cooling applications. EN 17415-1 [20]
defines the requirements for pipe assemblies, EN 17415-2 [21] covers fitting assemblies, and EN
17415-3 [22] specifies the requirements for steel valve assemblies, ensuring that all components are
suitable for the specific conditions of cold water distribution.
4.10 Factory-made flexible pipe systems for district heating
The standards on factory-made flexible pipe systems for district heating cover clässificätions, general
requirements, and test methods for both bonded and non-bonded systems with plastic or metal service
pipes.
The EN 15632 series [23] provides specificätions for flexible pre-insulated pipe systems used in district
heating applications. EN 15632-1 [24] defines general requirements and system components, EN
Currently under development.
Currently under development.
Currently under development.
kSIST-TP FprCEN/TR 18341:2026
FprCEN/TR 18341 (E)
15632-2 [25], specifies requirements for bonded systems, EN 15632-3 [26] covers non-bonded
systems, and EN 15632-4 [27] outlines test methods applicable to both configurätions.
The EN 17878 series provides further specificätions for flexible pipe systems with a lower temperature
profile. EN 17878-1 [28] defines general requirements, EN 17878-2 [29] specifies performance criteria
and product characteristics, and EN 17878-3 [30]outlines applicable test methods.
NOTE For lower temperature profile, see Figure 1 and Figure 2 .
CEN/TS 17889 [31] complements these standards by offering technical specificätions that support
harmonization in the design and application of flexible pipe systems for district heating and cooling.
4.11 Factory-made flexible pipe systems for district cooling
The EN 17414 series provides clässificätions, general requirements, and test methods for factory-made
flexible pipe systems with plastic service pipes, specificälly designed for distr
...