EN 13941:2009+A1:2010
(Main)Design and installation of preinsulated bonded pipe systems for district heating
Design and installation of preinsulated bonded pipe systems for district heating
This European Standard specifies rules for design, calculation and installation for preinsulated bonded pipe systems for buried hot water distribution and transmission networks (cf. Figure 2) with pipe assemblies in accordance with EN 253, for continuous operation with hot water at various temperatures up to 120ºC and occasionally with peak temperatures up to 140ºC and maximum internal pressure 25 bar (overpressure).
Application rule:
For larger pipe dimensions and pressures below 25 bar wall thickness bigger than specified in EN 253 can be required for straight pipes, bends and tees.
The principles of the standard can be applied to preinsulated pipe systems with pressures higher than 25 bar, provided that special attention is paid to the effects of pressure. Adjacent pipes belonging to the network (e.g. pipes in ducts, valve chambers, road crossings above ground etc.) can be designed and installed according to this standard.
The standard assumes use of treated water, which by softening, demineralisation, deaeration, adding of chemicals, or otherwise has been treated to prevent internal corrosion and deposits in the pipes.
This standard is not applicable for such units as:
a) pumps,
b) exchangers,
c) boiler installations, tank installations,
d) consumer installations.
However, the full functional ability and durability of such units should be ensured in consideration of the impacts from the district heating system and other impacts occurring from the conditions under which they have been installed.
Guidelines for product quality inspection and in situ tests of joints are given in Annex A of EN 448:2009, Annex D of EN 253:2009, Annex A of EN 488:2009 and Annex B of EN 489:2009.
Guidelines for welding of polyethylene casing are given in Annex B of EN 448:2009.
The estimation of expected life with continuous operation at various temperatures is outlined in Annex B of
EN 253:2009.
Auslegung und Installation von werkmäßig gedämmten Verbundmantelrohren für die Fernwärme
Diese Europäische Norm legt Auslegungs-, Berechnungs- und Verlegungsregeln für werkmäßig gedämmte Verbundmantelrohrsysteme für erdverlegte Warmwasserverteilungs- und -transportnetze (siehe Bild 2) mit Verbund-Rohrleitungssystemen nach EN 253 fest, die für den Dauerbetrieb mit Warmwasser bei unter-schiedlichen Temperaturen bis 120 °C und gelegentlichen Spitzentemperaturen bis 140 °C sowie bei maximalem Innendruck von 25 bar (Überdruck) vorgesehen sind. Anwendungsregel: Für größere Rohrmaße und Drücke unter 25 bar kann für gerade Rohre, Bögen und T-Stücke eine höhere Wanddicke als die in EN 253 festgelegte erforderlich sein. Die Grundsätze der Norm können auf werkmäßig gedämmte Rohrleitungssysteme mit Drücken über 25 bar angewendet werden, vorausgesetzt, die Auswirkungen der Drücke werden besonders beachtet. Angrenzende Rohre, die zum Netz gehören (z. B. Rohre in Kanälen, Armaturenschächten, oberirdische Straßenüberquerungen usw.), können entsprechend dieser Norm ausgelegt und verlegt werden. Die Norm setzt die Verwendung von aufbereitetem Wasser voraus, das durch Enthärtung, Entsalzung, Entlüf-tung, Zusatz von Chemikalien oder auf andere Art und Weise so behandelt worden ist, dass innere Korrosion und Ablagerungen in den Leitungen vermieden werden. Diese Norm gilt nicht für Geräte bzw. Anlagen, wie z. B. a) Pumpen; b) Wärmetauscher; c) Kesselanlagen, Behälteranlagen; d) Einrichtungen der angeschlossenen Kundenanlagen. Die volle Funktionsfähigkeit und Dauerhaftigkeit derartiger Geräte und Anlagen muss jedoch sichergestellt werden, indem die Einwirkungen des Fernwärmenetzes und andere aus den Bedingungen resultierende Einwirkungen berücksichtigt werden, unter denen sie installiert wurden. Richtlinien für Produktqualitätskontrollen und Vor-Ort-Prüfungen von Verbindungen sind in Anhang A von EN 448:2009, Anhang D von EN 253:2009, Anhang A von EN 488:2009 und Anhang B von EN 489:2009 angegeben.
Conception et installation des systèmes bloqués de tuyaux préisolés pour les réseaux enterrés d'eau chaude
La présente Norme européenne spécifie les règles de conception, de calcul et d'installation de systèmes bloqués de
tuyaux préisolés pour réseaux enterrés de distribution et de transmission d'eau chaude (voir Figure 2) avec des
tuyaux préisolés conformes à l’EN 253, pour une exploitation en continu avec de l’eau chaude à différentes
températures jusqu’à 120 °C, et occasionnellement avec des pics de température jusqu’à 140 °C et une pression
interne maximale de 25 bar (surpression).
Règle d’application :
Pour des tuyaux plus gros et des pressions inférieures à 25 bar, des épaisseurs de paroi plus importantes que celles spécifiées dans l’EN 253
peuvent être requises pour les tubes droits, les coudes et les tés.
Les principes de la présente norme peuvent être appliqués à des systèmes de tuyaux préisolés avec des pressions supérieures à 25 bar, pourvu
qu’il soit porté une attention spéciale aux effets de la pression. Les tuyaux adjacents appartenant au réseau (par exemple tubes en caniveaux,
chambres de vanne, traversée de route en aérien, etc.) peuvent être conçus et installés conformément à la présente norme.
La présente norme suppose l'utilisation d'eau traitée, par adoucissement, déminéralisation, désaération, ajout de
substances chimiques, ou par tout autre moyen permettant d'éviter la corrosion interne et les dépôts dans les tuyaux.
La présente Norme n'est pas applicable aux éléments tels que :
a) pompes ;
b) échangeurs ;
c) chaudières, réservoirs ;
d) installations destinées au consommateur.
Cependant, il convient que la capacité et la durabilité maximales de ces éléments soient garanties par rapport aux
impacts provenant du système de chauffage urbain et aux autres impacts apparaissant dans les conditions dans
lesquelles ils ont été installés.
Načrtovanje in vgradnja izoliranih vezanih cevnih sistemov za daljinsko ogrevanje
Ta evropski standard opredeljuje pravila za načrtovanje, izračun in vgradnjo izoliranih vezanih cevnih sistemov za podzemna omrežja za distribucijo in prenos tople vode (cf. slika 2) s cevnimi spoji v skladu z EN 253, za neprekinjeno obratovanje s toplo vodo pri različnih temperaturah do 120ºC in z občasnimi najvišjimi temperaturami do 140ºC ter najvišjim notranjim pritiskom 25 barov (nadtlak). Pravilo o uporabi: Za večje dimenzije cevi in pritisk, nižji od 25 barov, se lahko zahteva večja debelina sten, kot je določena v EN 253 za ravne cevi, kolena in cevne priključke T. Načela tega standarda je mogoče uporabiti za izolirane cevne sisteme s pritiski, višjimi od 25 barov, pod pogojem, da se nameni posebna pozornost učinkom tlaka. Sosednje cevi, ki spadajo k omrežju (npr. cevi v vodih, komore z ventili, nadzemni prehodi čez ceste, itd.) je mogoče načrtovati in vgraditi v skladu s tem standardom. Standard predvideva uporabo obdelane vode, ki je bila z mehčanjem, demineralizacijo, odzračevanjem, dodajanjem kemikalij ali kako drugače obdelana za preprečevanje notranje korozije in oblog v ceveh. Vendar pa je treba zagotoviti popolno funkcionalno zmožnost in trajnost takšnih enot, ob upoštevanju vplivov iz sistema daljinskega ogrevanja in drugih vplivov, do katerih pride zaradi pogojev, v katerih so bile vgrajene. Navodila za nadzor kakovosti proizvodov ter in situ preskušanj spojev so podana v dodatku A standarda EN 448:2009, dodatku D standarda EN 253:2009, dodatku A standarda EN 488:2009 in dodatku B standarda EN 489:2009. Navodila za varjenje polietilenskih oblog so podana v dodatku B standarda EN 448:2009. Ocena pričakovane življenjske dobe ob neprekinjenem obratovanju pri različnih temperaturah je navedena v dodatku B standarda EN 253:2009.
General Information
- Status
- Withdrawn
- Publication Date
- 13-Jul-2010
- Withdrawal Date
- 20-Jan-2026
- Technical Committee
- CEN/TC 107 - Pre-fabricated district heating pipe systems
- Current Stage
- 9960 - Withdrawal effective - Withdrawal
- Start Date
- 17-Apr-2019
- Completion Date
- 28-Jan-2026
Relations
- Merged From
EN 13941:2009 - Design and installation of preinsulated bonded pipe systems for district heating - Effective Date
- 19-Jan-2023
- Effective Date
- 19-Jan-2023
- Effective Date
- 24-Apr-2010
- Effective Date
- 08-Jun-2022
- Effective Date
- 08-Jun-2022
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- Effective Date
- 28-Jan-2026
- 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
EN 13941:2009+A1:2010 is a standard published by the European Committee for Standardization (CEN). Its full title is "Design and installation of preinsulated bonded pipe systems for district heating". This standard covers: This European Standard specifies rules for design, calculation and installation for preinsulated bonded pipe systems for buried hot water distribution and transmission networks (cf. Figure 2) with pipe assemblies in accordance with EN 253, for continuous operation with hot water at various temperatures up to 120ºC and occasionally with peak temperatures up to 140ºC and maximum internal pressure 25 bar (overpressure). Application rule: For larger pipe dimensions and pressures below 25 bar wall thickness bigger than specified in EN 253 can be required for straight pipes, bends and tees. The principles of the standard can be applied to preinsulated pipe systems with pressures higher than 25 bar, provided that special attention is paid to the effects of pressure. Adjacent pipes belonging to the network (e.g. pipes in ducts, valve chambers, road crossings above ground etc.) can be designed and installed according to this standard. The standard assumes use of treated water, which by softening, demineralisation, deaeration, adding of chemicals, or otherwise has been treated to prevent internal corrosion and deposits in the pipes. This standard is not applicable for such units as: a) pumps, b) exchangers, c) boiler installations, tank installations, d) consumer installations. However, the full functional ability and durability of such units should be ensured in consideration of the impacts from the district heating system and other impacts occurring from the conditions under which they have been installed. Guidelines for product quality inspection and in situ tests of joints are given in Annex A of EN 448:2009, Annex D of EN 253:2009, Annex A of EN 488:2009 and Annex B of EN 489:2009. Guidelines for welding of polyethylene casing are given in Annex B of EN 448:2009. The estimation of expected life with continuous operation at various temperatures is outlined in Annex B of EN 253:2009.
This European Standard specifies rules for design, calculation and installation for preinsulated bonded pipe systems for buried hot water distribution and transmission networks (cf. Figure 2) with pipe assemblies in accordance with EN 253, for continuous operation with hot water at various temperatures up to 120ºC and occasionally with peak temperatures up to 140ºC and maximum internal pressure 25 bar (overpressure). Application rule: For larger pipe dimensions and pressures below 25 bar wall thickness bigger than specified in EN 253 can be required for straight pipes, bends and tees. The principles of the standard can be applied to preinsulated pipe systems with pressures higher than 25 bar, provided that special attention is paid to the effects of pressure. Adjacent pipes belonging to the network (e.g. pipes in ducts, valve chambers, road crossings above ground etc.) can be designed and installed according to this standard. The standard assumes use of treated water, which by softening, demineralisation, deaeration, adding of chemicals, or otherwise has been treated to prevent internal corrosion and deposits in the pipes. This standard is not applicable for such units as: a) pumps, b) exchangers, c) boiler installations, tank installations, d) consumer installations. However, the full functional ability and durability of such units should be ensured in consideration of the impacts from the district heating system and other impacts occurring from the conditions under which they have been installed. Guidelines for product quality inspection and in situ tests of joints are given in Annex A of EN 448:2009, Annex D of EN 253:2009, Annex A of EN 488:2009 and Annex B of EN 489:2009. Guidelines for welding of polyethylene casing are given in Annex B of EN 448:2009. The estimation of expected life with continuous operation at various temperatures is outlined in Annex B of EN 253:2009.
EN 13941:2009+A1:2010 is classified under the following ICS (International Classification for Standards) categories: 23.040.07 - Pipeline and its parts for district heat; 23.040.10 - Iron and steel pipes; 91.140.10 - Central heating systems. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 13941:2009+A1:2010 has the following relationships with other standards: It is inter standard links to EN 13941:2009, EN 13941:2009/FprA1, EN 13941:2009/AC:2009, EN 13941-1:2019, EN 13941-2:2019, EN ISO 11666:2018, EN ISO 16810:2024, EN 10217-5:2019, EN 13018:2016, EN ISO 17637:2016, EN ISO 3834-1:2021, FprEN 15430-2, EN 10216-2:2024, EN ISO 15609-1:2019, EN ISO 3834-3:2021. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 13941:2009+A1:2010 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)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Auslegung und Installation von werkmäßig gedämmten Verbundmantelrohren für die FernwärmeConception et installation des systèmes bloqués de tuyaux préisolés pour les réseaux enterrés d'eau chaudeDesign and installation of preinsulated bonded pipe systems for district heating91.140.10Sistemi centralnega ogrevanjaCentral heating systemsICS:Ta slovenski standard je istoveten z:EN 13941:2009+A1:2010SIST EN 13941:2009+A1:2010en,fr,de01-september-2010SIST EN 13941:2009+A1:2010SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13941:2009+A1
July 2010 ICS 23.040.10; 91.140.10 Supersedes EN 13941:2009 English Version
Design and installation of preinsulated bonded pipe systems for district heating
Conception et installation des systèmes bloqués de tuyaux préisolés pour les réseaux enterrés d'eau chaude
Auslegung und Installation von werkmäßig gedämmten Verbundmantelrohren für die Fernwärme This European Standard was approved by CEN on 23 May 2009 and includes Corrigendum 1 issued by CEN on 11 November 2009 and Amendment 1 approved by CEN on 15 May 2010.
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 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 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13941:2009+A1:2010: ESIST EN 13941:2009+A1:2010
Design of piping components under internal pressure . 60A.1General . 60A.2Symbols . 60A.3Straight pipe and bends . 61A.4Tees and branch connections . 61A.5Reducers and extensions . 64A.6Dished ends . 65Annex B (informative)
Geotechnics and pipe-soil interaction . 67B.1Scope . 67B.2Symbols and units . 67B.3Soil parameters for global analysis (pipe-soil interaction) . 68B.4Characteristic values for soil loads and soil parameters . 78B.5Specific requirements for stability . 79B.6Specific requirements for parallel excavations . 82B.7Requirements for soft soils and settlement areas . 82B.8Ovalization and circumferential stresses from top load . 82Annex C (informative)
Global- and cross sectional analysis . 89C.1General . 89C.2Symbols . 89SIST EN 13941:2009+A1:2010
Calculation of heat losses . 121D.1General . 121D.2Heat loss per pipe pair . 121D.3Insulance of the soil . 122D.4Insulance of the insulation material . 122D.5Insulance of the heat exchange between flow and return pipe . 123Annex E
(informative)
˜˜˜˜National A-deviations™™™™ . 124Bibliography . 125 SIST EN 13941:2009+A1:2010
EN 253:2009. 2 Normative references The following referenced documents are indispensable for the application 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 253:2009, District heating pipes — Preinsulated bonded pipe systems for directly buried hot water networks — Pipe assembly of steel service pipe, polyurethane thermal insulation and outer casing of polyethylene EN 287-1, Qualification test of welders — Fusion welding — Part 1: Steels EN 444, Non-destructive testing — General principles for radiographic examination of metallic materials by X- and gamma-rays SIST EN 13941:2009+A1:2010
Key 1
One action cycle 2
Temperature or stress range Figure 1 — Action cycle 3.1.3 bonded system system consisting of a service pipe, insulating material and casing, which are bonded by the insulating material 3.1.4 cold installed preinsulated bonded pipes district heating systems where the pipes are installed and taken into operation without prior pre-stressing by pre-heating 3.1.5 creep slow progressive strain under the influence of stresses 3.1.6 design pressure
internal pressure equal to or greater than the maximum operating pressure at any point of the pipeline acting in a component or pipe section multiplied by a partial safety factor 3.1.7 design temperature maximum temperature used for the design of a component or pipe section 3.1.8 displacement-controlled action action called forth by enforced deformation or movement, e.g. thermal expansion or settling 3.1.9 distribution pipeline pipeline leading from place of production or transmission line to heating installations. Distribution mains are primarily main pipelines or house service connections, see Figure 2. 3.1.10 ductile materials materials which with good approximation are linearly elastic up to the yield stress or to the 0,2% proof stress, and which have a minimum elongation at rupture of 14 % SIST EN 13941:2009+A1:2010
Key 1
Transmission system 2
Distribution system 3
Transmission pipe 4
Main pipe 5
House service connection 6
Supply pipe 7
Consumer 8
Return pipe 9
Valve chamber 10
Heat production 11
Heat exchanger station 12
Pump station Figure 2 — Distribution and transmission systems 3.1.16 installation temperature temperature arising from the ambient conditions during laying or installation, prevalent at the time when action is taken 3.1.17 main pipeline pipeline supplying several heating installations. See Figure 2. SIST EN 13941:2009+A1:2010
maximum internal pressure acting against the pipe wall at any point or in any section of the pipeline at a given operating temperature Application rule: This is generally the internal pressure needed to take account of the static head, friction losses and required outlet pressure. 3.1.20 operating temperature water temperature in a component or pipe section during specified operating conditions 3.1.21 pre-heated system system which, after being assembled, but before backfilling, is heated to a pre-heating temperature allowing the system to expand without introducing additional stresses
3.1.22 preinsulated systems systems assembled at site consisting of prefabricated pipe elements and components with integrated protective casing, insulation and service pipe 3.1.23 pressure over-pressure or sub-pressure as compared to normal atmospheric pressure. Unless otherwise indicated, pressure refers to gauge pressure. 3.1.24 pre-stressing temperature temperature applied during pre-stressing of a pre-heated system Application rule: The pre-heating temperature is chosen such as approximately average axial stress is obtained, compared to the axial stress levels at ambient temperature and maximum operating temperature. 3.1.25 reference stress stress calculated (with sign) from the membrane or resulting stresses by Tresca or by von Mises’ formula Application rule: The formulae are presented in 6.4.3. 3.1.26 resulting stresses all stresses occurring in one point, i.e. membrane stresses plus stresses varying over the wall thickness 3.1.27 service life span of time during which the network is expected to function without major replacements, given normal maintenance and operation conditions as described in the project SIST EN 13941:2009+A1:2010
m (metre)
mm (millimetre) Mass
kg (kilogram) Force
N (Newton) Stress
N/mm² (Newton per square millimetre) Pressare
Pa (Pascal = Newton per square metre) Other units applied: Temperature
°C (degree centigrade) Pressure
bar (1 bar = 105 Pa = 0,1 N/mm2) 3.2.2 Symbols Table 1 — Symbols Symbol Name A Area c Cohension of the soil, fabrication tolerance D Diameter of casing d Diameter of service pipe E Modulus of elasticity F Friction force f Design stress, friction force per area unit, deflection G Selfweight I Momentum of inertial i Stress intensification factor L Friction length l Length M Bending moment N Normal force, number of full action cydes n Number p Internal pressure Re Specified minimum upper yield strength Rm Tensile strength R Bend radius r Pipe radius T Temperature SIST EN 13941:2009+A1:2010
Table 2 — Indices a : Action min : Minimum b : Branch pipe (at tee connections) n : Nominal, number (of fatigue cycles) c : Casing o : Outer, outside d : Design r : Run pipe (at tees) fat : Fatigue res : Resulting i : Inner, inside u : Fracture j : Reference v : Vertical m : Mean, membrane, material
NOTE Separate symbol lists are found in Annexes A, B and C. SIST EN 13941:2009+A1:2010
Installation expenses, maintenance expenses and operating expenses arising throughout the service life of the system should be included in the assessment of the system. The assessment of operating properties should pay regard to the possibilities of inspection and maintenance. 4.2 Service life When a system designed according to this standard is subject to temperatures exceeding 120 oC, for periods such that the requirement for a service life of 30 years at continuous operation at 120 oC, calculated in accordance with Annex B of EN 253:2009, is exceeded, the service life of components subject to ageing must be assessed. Application rule: The minimum requirements for the type test of EN 253 (based on the shear strength between PUR foam and steel pipe) is a service life of
30 years for continuous operation at 120 oC. If the cumulative ageing requires a lifetime exceeding the equivalence of 30 years at 120 oC special documentation for the ageing properties are required. 4.3 Preliminary investigations Preliminary investigations comprising an assessment of all conditions of importance to a district heating project shall be carried out. These preliminary investigations shall elucidate matters in the planning, design, execution and operating stages as well as consequences of any kind of failure of the system. The principal basis of the preliminary investigation is the main data for the current system, e.g.:
function,
pressure and temperature,
dimensions,
depth of burial,
geotechnical and groundwater parameters, etc. Application rule:
...
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