District heating pipes - Design and installation of thermal insulated bonded single and twin pipe systems for directly buried hot water networks - Part 1: Design

This European Standard specifies requirements for design, calculation and installation of factory made thermal insulated bonded single and twin pipe systems for directly buried hot water networks for continuous operation with treated hot water at various temperatures up to 120 ºC and occasionally with peak temperatures up to 140 ºC and maximum internal pressure 2,5 MPa. Flexible pipe systems according to EN 15632 are not under the scope of this standard.
The standard EN 13941, Design and installation of thermal insulated bonded single and twin pipe systems for directly buried hot water networks consists of two parts:
a)   prEN 13941-1: Design;
b)   prEN 13941-2: Installation.
The requirements and stipulations in this part: EN 13941-1, form an unbreakable unity with those of prEN 13941-2. This part shall therefore exclusively be used in combination with prEN 13941-2.
The principles of the standard may be applied to thermal insulated pipe systems with pressures higher than 2,5 MPa, provided that special attention is paid to the effects of pressure.
Adjacent pipes, not buried, but belonging to the network (e. g. pipes in ducts, valve chambers, road crossings above ground etc.) may be designed and installed according to this standard.
This standard presupposes the use of treated water, which by softening, demineralisation, de-aeration, adding of chemicals, or otherwise has been treated to effectively prevent internal corrosion and deposits in the pipes.
NOTE   For further information on water qualities to be used in district heating pipe systems see also [1].
This standard is not applicable for such units as:
a)   pumps;
b)   heat exchangers;
c)   boilers, tanks;
d)   systems behind domestic substations.

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.

Tuyaux de chauffage urbain - Conception et installation des systèmes bloqués de monotubes ou bitubes isolés thermiquement pour les réseaux d'eau chaude enterrés directement - Partie 1 : Conception

La présente Norme européenne spécifie les exigences relatives à la conception, au calcul et à l'installation de systèmes manufacturés bloqués de monotubes ou bitubes isolés thermiquement pour les réseaux d'eau chaude enterrés directement, pour un service continu avec de l'eau chaude traitée à différentes températures jusqu’à 120 °C, et occasionnellement avec des pics de température jusqu’à 140 °C et une pression interne maximale de 2,5 MPa. Les systèmes de tuyaux flexibles conformes à la série de normes EN 15632 ne relèvent pas du domaine d'application de la présente norme.
La norme EN 13941, Conception et installation des systèmes bloqués de monotubes et bitubes isolés thermiquement pour les réseaux d'eau chaude enterrés directement comprend deux parties :
a)   prEN 13941 1 : Conception ;
b)   prEN 13941 2 : Installation.
Les exigences et stipulations de la présente partie : prEN 13941 1, sont indissociables de celles du prEN 13941 2. Il convient donc d'utiliser exclusivement la présente partie en combinaison avec le prEN 13941 2.
Les principes de la présente norme peuvent être appliqués à des systèmes de tuyaux isolés thermiquement avec des pressions supérieures à 2,5 MPa, pourvu qu’il soit porté une attention spéciale aux effets de la pression.
Les tuyaux adjacents non enterrés, mais 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 présuppose l'utilisation d'eau traitée, par adoucissement, déminéralisation, désaération, ajout de substances chimiques, ou par tout autre moyen permettant d'éviter efficacement la corrosion interne et les dépôts dans les tuyaux.
NOTE   Pour de plus amples informations sur les qualités d'eau à utiliser dans les systèmes de tuyaux pour le chauffage urbain, voir également la référence [1].
La présente Norme n'est pas applicable aux éléments tels que :
a)   pompes ;
b)   échangeurs de chaleur ;
c)   chaudières, réservoirs ;
d)   systèmes en aval des postes de raccordement.

Cevi za daljinsko ogrevanje - Projektiranje in vgradnja toplotno izoliranih spojenih eno- in dvocevnih sistemov za neposredno zakopana vročevodna omrežja - 1. del: Projektiranje

Ta evropski standard določa zahteve za projektiranje, izračun in vgradnjo tovarniško izdelanih toplotno izoliranih spojenih eno- in dvocevnih sistemov za neposredno zakopana vročevodna omrežja za neprekinjeno delovanje z obdelano vročo vodo pri različnih temperaturah do 120 °C in občasnih najvišjih temperaturah do 140 °C ter najvišjemu notranjemu tlaku 2,5 MPa. Ta standard ne zajema gibkih cevnih sistemov v skladu s standardom EN 15632.
Standard EN 13941 – Projektiranje in vgradnja toplotno izoliranih spojenih eno- in dvocevnih sistemov za neposredno zakopana vročevodna je sestavljen iz dveh delov:
a) Standard prEN 13941-1: Zasnova
b) Standard prEN 13941-2: Vgradnja
Zahteve in določbe iz tega dela standarda: EN 13941-1 tvori neločljivo enotnost z zahtevami in določbami standarda prEN 13941-2. Ta del se zato uporablja izključno skupaj s standardom prEN 13941-2.
Načela standarda se lahko uporabljajo za toplotno izolirane cevne sisteme s tlaki, višjimi od 2,5 MPa, če je posebna pozornost namenjena učinkom tlaka.
Sosednje cevi, ki niso zakopane, vendar pripadajo omrežju (npr. cevi v jaških, ventilskih komorah, cestnih prehodih nad tlemi itd.), je mogoče projektirati in vgraditi na podlagi tega standarda.
Ta standard predpostavlja uporabo obdelane vode, ki z mehčanjem, demineralizacijo, razzračevanjem, dodajanjem kemikalij ali z drugo obdelavo učinkovito preprečuje notranjo korozijo in nastajanje oblog na ceveh.
OPOMBA:   Za dodatne informacije o kakovosti vode za uporabo v cevnih sistemih za daljinsko ogrevanje glej tudi [1].
Ta standard se ne uporablja za enote, kot so:
a) črpalke,
b) izmenjevalniki toplote,
c) kotli, rezervoarji,
d) sistemi za domačimi razdelilnimi postajami.

General Information

Status
Published
Public Enquiry End Date
05-Oct-2016
Publication Date
14-May-2019
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
25-Apr-2019
Due Date
30-Jun-2019
Completion Date
15-May-2019

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Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 13941-1:2019
01-julij-2019
Nadomešča:
SIST EN 13941:2009+A1:2010
Cevi za daljinsko ogrevanje - Projektiranje in vgradnja toplotno izoliranih spojenih
eno- in dvocevnih sistemov za neposredno zakopana vročevodna omrežja - 1. del:
Projektiranje
District heating pipes - Design and installation of thermal insulated bonded single and
twin pipe systems for directly buried hot water networks - Part 1: Design
Auslegung und Installation von werkmäßig gedämmten Verbundmantelrohren für die
Fernwärme
Tuyaux de chauffage urbain - Conception et installation des systèmes bloqués de
monotubes ou bitubes isolés thermiquement pour les réseaux d'eau chaude enterrés
directement - Partie 1 : Conception
Ta slovenski standard je istoveten z: EN 13941-1:2019
ICS:
23.040.07 Cevovodi za daljinsko Pipeline and its parts for
ogrevanje in njihovi deli district heat
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
SIST EN 13941-1:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 13941-1:2019

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SIST EN 13941-1:2019


EN 13941-1
EUROPEAN STANDARD

NORME EUROPÉENNE

April 2019
EUROPÄISCHE NORM
ICS 23.040.10; 91.140.10 Supersedes EN 13941:2009+A1:2010
English Version

District heating pipes - Design and installation of thermal
insulated bonded single and twin pipe systems for directly
buried hot water networks - Part 1: Design
Tuyaux de chauffage urbain - Conception et installation Auslegung und Installation von werkmäßig
des systèmes bloqués de monotubes ou bitubes isolés gedämmten Verbundmantelrohren für die Fernwärme
thermiquement pour les réseaux d'eau chaude enterrés
directement - Partie 1 : Conception
This European Standard was approved by CEN on 14 December 2018.

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-CENELEC 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-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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13941-1:2019 E
worldwide for CEN national Members.

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SIST EN 13941-1:2019
EN 13941-1:2019 (E)
Contents Page
European foreword . 8
Introduction .10
1 Scope .11
2 Normative references .11
3 Terms and definitions, units and symbols .12
3.1 Terms and definitions .12
3.1.1 Symbols .13
3.1.2 Abbreviations .19
4 General requirements .19
4.1 Functional requirements.19
4.2 Service life .19
4.3 Preliminary investigations .20
4.4 Determination of project class .21
4.4.1 Risk assessment .21
4.4.2 Project classes .21
4.5 Design documentation .23
4.5.1 General .23
4.5.2 Operational data .24
4.5.3 Data related to the pipe system .24
4.6 Route selection and positioning of the pipes .26
4.6.1 Minimum distances between parallel pipes .26
4.6.2 Parallel excavations and works of third parties .27
4.6.3 Minimum distance between district heating pipes and underground structures .27
4.7 Venting and draining .27
4.8 Valves.27
4.9 Procurement of materials .28
4.9.1 Manufacturer of pipeline components .28
4.10 Quality control .28
4.10.1 General .28
4.10.2 Design phase .28
4.10.3 Installation phase .28
5 Requirements for components and materials .29
5.1 Basic requirements .29
5.2 Steel service pipe components .29
5.2.1 General .29
5.2.2 Specification .30
5.2.3 Characteristic values for steel .30
5.2.4 Specific requirements for bends and T-pieces .31
5.2.5 Specific requirements for small angular deviations .32
5.2.6 Specific requirements for reducers .33
5.3 Polyurethane foam thermal insulation .33
5.4 Casing .33
5.5 Materials for casing and thermal insulation of field joints .33
5.6 Expansion cushions .33
5.6.1 General .33
5.6.2 Materials .34
2

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SIST EN 13941-1:2019
EN 13941-1:2019 (E)
5.6.3 Stiffness properties . 34
5.6.4 Selecting required thickness of expansion cushions . 35
5.6.5 Marking . 35
5.7 Valves and accessories . 35
5.7.1 General requirements . 35
5.7.2 Marking and documentation . 36
6 Design and calculation . 36
6.1 General procedure . 36
6.2 Pipeline components, areas, conditions and interfaces to be included in the
analyses . 37
6.2.1 Components . 37
6.2.2 Areas requiring specific analyses . 38
6.2.3 Special conditions . 38
6.2.4 Interfaces . 38
6.3 Simplified analysis procedure . 39
6.4 Actions . 39
6.4.1 General . 39
6.4.2 Classification of actions and load combinations . 39
6.4.3 Temperature variations . 41
6.4.4 Top load from soil. 42
6.4.5 Traffic loads . 42
6.5 Global analysis and pipe-soil interaction . 44
6.5.1 General . 44
6.5.2 Modelling pipe-soil interaction . 44
6.5.3 Pipe to soil friction (axial) . 46
6.5.4 Horizontal soil reaction (lateral) . 48
6.5.5 Combined lateral stiffness of steel service pipe, PUR, expansion cushions and soil . 53
6.5.6 Soil properties . 55
6.5.7 Thermal expansion of buried pipe sections: . 55
6.5.8 Pipe systems with single use compensators (SUC’s) . 58
6.5.9 Specific requirements for vertical and horizontal stability . 60
6.5.10 Parallel excavations . 63
6.5.11 Requirements for soft soils and settlement areas . 64
6.5.12 Specific design requirements for above-ground pipelines with factory made pipe
and fitting assemblies . 64
6.5.13 Insertion into protection pipe. 64
6.6 Determination of stresses and strains . 65
6.6.1 General . 65
6.6.2 Cross section analyses, steel . 65
6.6.3 Assessment on the basis of a resultant (equivalent) stress . 66
6.6.4 Stresses and ovalization from top load . 67
6.6.5 Deflection . 69
6.6.6 Bends . 69
6.6.7 T-pieces . 70
6.6.8 Single Use Compensators (SUC’s) . 73
6.6.9 PUR and casing . 74
6.7 Fatigue analyses . 75
6.7.1 General . 75
6.7.2 Action cycles . 75
6.8 Further actions . 77
7 Limit states . 77
7.1 General . 77
7.2 Limit states for service pipes of steel . 78
3

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SIST EN 13941-1:2019
EN 13941-1:2019 (E)
7.2.1 General .78
7.2.2 Limit state A: Failure caused by plastic deformation .78
7.2.3 Limit state B: Failure caused by fatigue .81
7.2.4 Limit state C: Failure caused by instability of the system or part of it .84
7.2.5 Limit state D: Serviceability limit state .86
7.2.6 Survey of limit states for steel .86
7.3 Limit states for PUR and PE .89
7.3.1 Compressive stress .89
7.3.2 Limit state for shear stress .89
7.3.3 Limit state for PE .89
7.4 Limit states for valves .89
Annex A (normative) Design of piping components under internal pressure .91
A.1 General .91
A.2 Straight pipe and bends .91
A.2.1 Straight pipes .91
A.2.2 Bends .91
A.3 T-pieces and branch connections .92
A.3.1 General aspects and limitations .92
A.3.2 Reinforcement .92
A.3.2.1 General .92
A.3.2.2 Dissimilar material of shell and reinforcement .92
A.3.2.3 Thickness ratio .93
A.3.2.4 Calculation method for reinforcement area .93
A.3.2.5 Reinforcement by increased wall thickness .93
A.3.2.6 Reinforcement by compensating plates.94
A.4 Reducers and extensions .95
A.5 Dished ends .95
A.5.1 General .95
A.5.2 Ellipsoidal Dished Head Minimum required wall thickness for internal pressure .96
A.5.3 Straight cylindrical shells .96
Annex B (informative) Soil properties and geotechnical parameters for pipe/soil
interaction analyses .97
B.1 General requirements .97
B.2 Geotechnical parameters for global analysis (pipe-soil interaction) .97
B.3 Geotechnical Study .98
B.3.1 Field study .98
B.3.2 Typical values, referred to mean value .98
B.3.3 Investigation of interface friction .98
B.4 Characteristic values for soil properties .98
B.4.1 Typical values, referred to mean value .98
B.4.2 Spatial variation of soil properties .99
4

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SIST EN 13941-1:2019
EN 13941-1:2019 (E)
B.5 Model uncertainty when determining geotechnical parameters. 100
Annex C (informative) Flexibility and stress concentration of pipe components . 102
C.1 General . 102
C.2 Flexibility factors for pipe components. 102
C.2.1 Bends . 102
C.2.2 T-pieces . 102
C.2.3 Other components . 103
C.3 Stress concentration in pipe elements . 103
C.3.1 Butt welds . 103
C.3.2 Bends . 103
C.3.2.1 Stress concentration factors for bends: Simplified method . 103
C.3.2.2 Stress concentration factors for bends: exact calculation . 104
C.3.3 T-pieces . 105
C.3.3.1 General . 105
C.3.4 Small angular deviations . 107
C.3.5 Reducers . 108
Annex D (informative) Calculation of heat losses . 110
D.1 General . 110
D.2 Heat losses of thermal insulated pipes . 110
D.2.1 Pair of single pipes — calculation of specific heat loss . 110
D.2.2 symmetrical and (a) antisymmetrical heat loss factors according to zero-order
multipole formulae: . 111
D.2.3 Using Zero-order approximation for (s) symmetrical and (a) antisymmetrical
problem the heat resistance can be calculated: . 111
D.2.4 specific heat loss of pipes . 112
D.2.5 Twin Pipes — calculation of specific heat loss . 112
D.2.6 temperatures of pipes . 113
D.2.7 (s) symmetrical and (a) antisymmetrical heat loss factors according to first-order
multipole formula: . 114
D.2.8 specific heat loss of pipes . 115
Annex E (informative) Specific requirements for twin pipe systems . 116
E.1 General . 116
E.2 Component and materials . 116
E.2.1 Twin Pipe assembly . 116
E.2.2 Fixing bars . 117
E.3 Max. allowable stresses for specific twin pipe system elements: . 118
E.3.1 Project classes . 118
E.3.2 Soil friction, twin pipe friction length and pipe expansion . 118
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SIST EN 13941-1:2019
EN 13941-1:2019 (E)
E.3.3 Axial stress in the flow and return steel service pipes . 120
E.3.4 Dimensions of the fixing bars . 122
E.3.4.1 General . 122
E.3.4.2 loads on the fixing bars type A .
...

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