District heating pipes - Design and installation of thermal insulated bonded single and twin pipe systems for directly buried hot water networks - Part 2: Installation

This European Standard specifies requirements for design, calculation and installation of factory made thermal insulated bonded single and twin pipe systems for directly buried 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)   EN 13941-1: Design;
b)   EN 13941-2: Installation.
The requirements and stipulations in this part: prEN 13941-2, form an unbreakable unity with those of prEN 13941-1. This part shall therefore exclusively be used in combination with prEN 13941-1.
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.
This standard is not applicable for such units as:
a)   pumps;
b)   heat exchangers;
c)   boilers, tanks;
d)   systems behind domestic substations.

Fernwärmerohre - Auslegung und Installation von gedämmten Einzel- und Doppelrohr-Verbundsystemen für direkt erdverlegte Heißwasser-Fernwärmenetze - Teil 2: Installation

Dieses Dokument legt Auslegungs-, Berechnungs- und Verlegungsanforderungen für werkmäßig hergestellte, gedämmte Einzel- und Doppelrohrverbundsysteme für erdverlegte Heizwasser-Fernwärmenetze fest, die für den Dauerbetrieb mit aufbereitetem Wasser bei unterschiedlichen Temperaturen bis 120 °C und gelegentlichen Spitzentemperaturen bis 140 °C für höchstens 300 h/a sowie bei maximalem Innendruck von 2,5 MPa vorgesehen sind.
Flexible Rohrsysteme nach EN 15632 liegen nicht im Anwendungsbereich dieser Norm.
Die Norm EN 13941, Auslegung und Installation von gedämmten Einzel- und Doppelrohr-Verbundsystemen für direkt erdverlegte Heizwasser-Fernwärmenetze besteht aus zwei Teilen:
a)   EN 13941 1: Auslegung
b)   EN 13941 2: Installation
Die Anforderungen in diesem Teil, EN 13941 2, bilden eine Einheit mit jenen aus EN 13941 1.
Die Grundsätze der Norm können auf wärmegedämmte Rohrleitungssysteme mit Drücken über 2,5 MPa angewendet werden, vorausgesetzt, die Auswirkungen dieses höheren Drucks werden besonders beachtet.
Angrenzende Rohre, die zum Netz gehören aber nicht erdverlegt sind (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, Entlüftung, Zusatz von Chemikalien oder auf andere Art und Weise so behandelt worden ist, dass innere Korrosion und Ablagerungen in den Leitungen effektiv vermieden werden.
ANMERKUNG   Für weitere Informationen zu den Qualitäten des in Fernwärmerohrsystemen zu verwendenden Wassers, siehe Literaturhinweis [8].
Dieses Dokument gilt nicht für Geräte bzw. Anlagen, wie z. B.:
a)   Pumpen,
b)   Wärmetauscher;
c)   Kessel, Speicher;
d)   Systeme hinter Hausregelstationen.

Tuyaux de chauffage urbain - Conception et installation des systèmes bloqués de tuyaux monotubes et bitubes isolés thermiquement pour les réseaux d’eau chaude enterrés directement - Partie 2 : Installation

La présente Norme européenne spécifie les exigences de conception, de calcul et d'installation de systèmes bloqués de tuyaux monotubes et bitubes isolés thermiquement fabriqués en usine pour les réseaux d'eau chaude enterrés directement pour une exploitation en 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 selon l'EN 15632 ne sont pas couverts par le domaine d'application de la présente Norme.
L'EN 13941, Tuyaux de chauffage urbain — Conception et installation des systèmes bloqués de tuyaux monotubes et bitubes isolés thermiquement pour les réseaux d'eau chaude enterrés directement se compose des deux parties suivantes :
a)   EN 13941-1 : Conception ;
b)   EN 13941-2 : Installation.
Les exigences et dispositions de la présente partie prEN 13941-2 et celles du prEN 13941-1 constituent un tout indivisible. La présente partie doit donc exclusivement être utilisée conjointement avec le prEN 13941-1.
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 à vannes, traversées 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.
La présente Norme n'est pas applicable aux éléments tels que :
a)   pompes ;
b)   échangeurs thermiques ;
c)   chaudières, réservoirs ;
d)   systèmes sous-tendant des sous-stations domestiques.

Cevi za daljinsko ogrevanje - Projektiranje in vgradnja toplotno izoliranih spojenih eno- in dvocevnih sistemov za neposredno zakopana vročevodna omrežja - 2. del: Vgradnja

Ta evropski standard določa zahteve za projektiranje, izračun in vgradnjo tovarniško izdelanih toplotno izoliranih spojenih eno- in dvocevnih sistemov za neposredno zakopana 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 EN 13941-1: Zasnova
b)   Standard EN 13941-2: Vgradnja
Zahteve in določbe iz tega dela standarda: prEN 13941-2 tvorijo neločljivo enotnost z zahtevami in določbami standarda prEN 13941-1. Ta del se zato uporablja izključno skupaj s standardom prEN 13941-1.
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.
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
Withdrawn
Publication Date
16-Apr-2019
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
15-Dec-2021

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SLOVENSKI STANDARD
SIST EN 13941-2:2019
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 - 2. del:
Vgradnja

District heating pipes - Design and installation of thermal insulated bonded single and

twin pipe systems for directly buried hot water networks - Part 2: Installation

Fernwärmerohre - Auslegung und Installation von gedämmten Einzel- und Doppelrohr-

Verbundsystemen für direkt erdverlegte Heizwasser-Fernwärmenetze - Teil 2:
Installation

Tuyaux de chauffage urbain - Conception et installation des systèmes bloqués de tuyaux

préisolés pour les réseaux enterrés d'eau chaude - Partie 2 : Installation
Ta slovenski standard je istoveten z: EN 13941-2:2019
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 13941-2:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 13941-2:2019
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SIST EN 13941-2:2019
EN 13941-2
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2019
EUROPÄISCHE NORM
ICS 23.040.07; 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 2: Installation

Tuyaux de chauffage urbain - Conception et installation Fernwärmerohre - Auslegung und Installation von

des systèmes bloqués de tuyaux monotubes et bitubes gedämmten Einzel- und Doppelrohr-Verbundsystemen

isolés thermiquement pour les réseaux d'eau chaude für direkt erdverlegte Heizwasser-Fernwärmenetze -

enterrés directement - Partie 2 : Installation Teil 2: Installation
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 13941-2:2019 E

worldwide for CEN national Members.
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SIST EN 13941-2:2019
EN 13941-2:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 6

Introduction .................................................................................................................................................................... 7

1 Scope .................................................................................................................................................................. 8

2 Normative references .................................................................................................................................. 8

3 Terms and definitions and symbols .................................................................................................... 11

3.1 Terms and definitions .............................................................................................................................. 11

3.2 Symbols.......................................................................................................................................................... 11

3.3 Abbreviations .............................................................................................................................................. 11

4 Procurement ................................................................................................................................................ 11

4.1 Manufacturer of thermal insulated pipe elements ........................................................................ 11

4.2 Performing assembly of casing joints and PE-welding on casings ........................................... 11

5 General requirements .............................................................................................................................. 12

6 Required information .............................................................................................................................. 12

6.1 Documents from the design phase....................................................................................................... 12

6.2 Documents from the manufacturers ................................................................................................... 12

6.3 Existing construction and underground systems .......................................................................... 13

6.3.1 General ........................................................................................................................................................... 13

6.4 Wiring design diagram ............................................................................................................................. 13

7 Quality control ............................................................................................................................................ 13

7.1 General ........................................................................................................................................................... 13

7.2 Installation and approval ........................................................................................................................ 14

8 Site preparation .......................................................................................................................................... 15

8.1 General ........................................................................................................................................................... 15

8.2 Liason with Authorities and other parties concerned .................................................................. 16

8.3 Site access ..................................................................................................................................................... 16

8.4 Equipment and material .......................................................................................................................... 16

9 Trenching ...................................................................................................................................................... 17

9.1 General ........................................................................................................................................................... 17

9.2 Groundwater extraction .......................................................................................................................... 17

9.3 Installation of pipelines crossing or parallel with other constructions and existing

conduits ......................................................................................................................................................... 18

9.4 Excavations crossing or parallel to existing district heating pipelines, reducing of

soil cover, etc ............................................................................................................................................... 18

10 Transport and storage of pipe elements, pipe components and other materials .............. 18

10.1 General ........................................................................................................................................................... 18

10.2 Transport and delivery ............................................................................................................................ 18

10.2.1 Loading and unloading ............................................................................................................................ 18

10.2.2 Checking of the delivery .......................................................................................................................... 19

10.3 Storage ........................................................................................................................................................... 19

10.3.1 General ........................................................................................................................................................... 19

10.3.2 Storage of pipe assemblies ..................................................................................................................... 19

10.3.3 Storage of fitting and valve assemblies .............................................................................................. 20

10.3.4 Storage of joint casing systems and other materials .................................................................... 20

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SIST EN 13941-2:2019
EN 13941-2:2019 (E)

11 Pipe laying ..................................................................................................................................................... 20

11.1 General ........................................................................................................................................................... 20

11.2 Installation in the trench ......................................................................................................................... 21

11.3 Welding and testing of welds ................................................................................................................. 21

11.3.1 Welding of the steel service pipe and testing of the welds .......................................................... 21

11.4 Venting and Draining ................................................................................................................................ 30

11.5 Test for leak tightness and strength .................................................................................................... 34

11.5.1 General ........................................................................................................................................................... 34

11.5.2 Visual test with over pressure by air .................................................................................................. 34

11.5.3 Visual test below atmospheric pressure by air ............................................................................... 35

11.5.4 Hydrostatic test ........................................................................................................................................... 35

11.6 Joint Casing ................................................................................................................................................... 39

11.6.1 General ........................................................................................................................................................... 39

11.6.2 Joints ............................................................................................................................................................... 39

11.6.3 Site prepared components ...................................................................................................................... 39

11.7 Surveillance system ................................................................................................................................... 42

11.8 Expansion cushions ................................................................................................................................... 43

11.9 Electrical and telecommunication cable of the systems .............................................................. 45

11.10 Requirements for horizontal directional drilling (HDD) ............................................................. 45

11.11 Requirements for critical locations ..................................................................................................... 45

11.11.1 Wall penetrations ....................................................................................................................................... 45

11.11.2 Connections to other pipe systems ...................................................................................................... 46

11.11.3 Pipe laying in protection tubes.............................................................................................................. 46

11.11.4 Protection against external impact for above ground installations ........................................ 46

11.12 Position of pipeline .................................................................................................................................... 46

12 Backfilling ..................................................................................................................................................... 47

12.1 General ........................................................................................................................................................... 47

12.2 Bedding material and composition ...................................................................................................... 48

13 Commissioning ............................................................................................................................................ 49

14 Operation....................................................................................................................................................... 49

15 Documentation ............................................................................................................................................ 49

15.1 Information on operation and maintenance .................................................................................... 49

15.1.1 Range of application .................................................................................................................................. 49

15.1.2 Documentation — aims and uses.......................................................................................................... 49

15.1.3 Technical documentation ........................................................................................................................ 50

15.1.4 Drawings of the technical documentation ......................................................................................... 54

15.1.5 As-built documentation............................................................................................................................ 58

15.2 Documentation under the scope of the PED ..................................................................................... 58

Annex A (informative) Venting and Draining .................................................................................................. 59

A.1 General ........................................................................................................................................................... 59

A.2 Venting and draining devices ................................................................................................................. 59

A.3 Draining devices for large pipeline dimensions ............................................................................. 61

A.4 Venting of new pipe sections .................................................................................................................. 62

A.4.1 Venting by house connection pipeline ................................................................................................ 62

A.4.2 Venting by venting cabinets ................................................................................................................... 63

Annex B (informative) Recommendations for HDD ...................................................................................... 65

B.1 General ........................................................................................................................................................... 65

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SIST EN 13941-2:2019
EN 13941-2:2019 (E)

B.2 Depth under roads ..................................................................................................................................... 65

B.3 Minimum intermediate distances ........................................................................................................ 66

B.4 Casing and casing field joints ................................................................................................................. 66

B.5 Drilling fluid composition ....................................................................................................................... 66

B.6 Drilling fluid pressures ............................................................................................................................ 66

B.7 Borehole dimensions and borehole stability ................................................................................... 67

B.8 Ballasting ...................................................................................................................................................... 67

B.9 Installation of pipe bundles ................................................................................................................... 68

B.10 Determination of position and route corrections .......................................................................... 68

B.11 Registration and control of HDD .......................................................................................................... 69

B.12 Drilling Tolerances .................................................................................................................................... 69

B.13 Verification of design and methodology for the pullback operation ...................................... 70

B.14 As-Built information ................................................................................................................................. 70

Annex C (informative) Qualification of fitters installing joints in pre-insulated bonded pipe

networks ....................................................................................................................................................... 71

C.1 Knowledge and skills ................................................................................................................................ 71

C.2 Background for training and testing ................................................................................................... 71

C.3 Subjects for training and testing .......................................................................................................... 71

C.3.1 General ........................................................................................................................................................... 71

C.3.2 Casing of polyethylene (PE) ................................................................................................................... 72

C.3.2.1 Important construction characteristics and properties .............................................................. 72

C.3.2.2 Technological behaviour of PE .............................................................................................................. 72

C.3.2.3 Mechanical properties of PE .................................................................................................................. 72

C.3.2.4 Conditions for casing elements under load ...................................................................................... 73

C.3.3 Surveillance ................................................................................................................................................. 73

C.3.4 PUR-foam system ....................................................................................................................................... 73

C.3.4.1 PUR-foam as a two component material ........................................................................................... 73

C.3.4.2 Insulation procedures on job site ........................................................................................................ 73

C.3.5 Joint types/jointing systems .................................................................................................................. 74

C.3.5.1 General ........................................................................................................................................................... 74

C.3.5.2 Shrink sleeve joint with mastic/adhesive sealing ......................................................................... 74

C.3.5.3 Welded joints/systems ............................................................................................................................ 74

C.3.6 Installation of joints .................................................................................................................................. 75

C.3.6.1 General ........................................................................................................................................................... 75

C.3.6.2 Installation of surveillance system ...................................................................................................... 75

C.3.6.3 Sealed joints ................................................................................................................................................. 76

C.3.6.4 Welded joints ............................................................................................................................................... 77

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SIST EN 13941-2:2019
EN 13941-2:2019 (E)

C.3.6.5 Insulation of joints ..................................................................................................................................... 77

C.3.6.6 Documentation ............................................................................................................................................ 78

Annex D (informative) Quality control program and documentation .................................................... 79

Annex E (normative) Commissioning ................................................................................................................. 91

E.1 Commissioning ............................................................................................................................................ 91

E.1.1 General ........................................................................................................................................................... 91

E.1.2 Filling with water for initial operation ............................................................................................... 92

E.1.3 Surveillance system ................................................................................................................................... 92

Annex F (informative) Operation ......................................................................................................................... 93

Bibliography ................................................................................................................................................................. 94

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SIST EN 13941-2:2019
EN 13941-2:2019 (E)
European foreword

This document (EN 13941-2:2019) has been prepared by Technical Committee CEN/TC 107

“Prefabricated district heating and district cooling pipe systems”, the secretariat of which is held by DS.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by October 2019, and conflicting national standards shall

be withdrawn at the latest by October 2019.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 13941:2009+A1:2010.

EN 13941, District heating pipes — Design and installation of thermal insulated bonded single and twin

pipe systems for directly buried hot water networks consists of the following parts:

— Part 1: Design;
— Part 2: Installation.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: 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 the United Kingdom.
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SIST EN 13941-2:2019
EN 13941-2:2019 (E)
Introduction

This document has been prepared by CEN/TC 107/WG 13 „Prefabricated district heating and district

cooling pipe system“.
According to the scope of CEN/TC 107:

— the task of CEN/TC 107/WG 13 is to specify rules for design, calculation and installation for factory

made thermal insulated bonded single and twin pipe systems for directly buried hot water

networks.;

— CEN/TC 107/WG 13 also contributes to rules for functional tests for thermal-insulated bonded pipe

systems for underground hot water networks;

When use is made of the standard, the different sections of which it is made up are to be interpreted as

being interdependent and, because of this, cannot be dissociated.

The revision of EN 13941:2009+A1:2010 involves the subdivision of the document in two separate

documents:

— EN 13941-1, District heating pipes — Design and installation of thermal insulated bonded single and

twin pipe systems for directly buried hot water networks — Part 1: Design;

— EN 13941-2, District heating pipes — Design and installation of thermal insulated bonded single and

twin pipe systems for directly buried hot water networks — Part 2: Installation.

This volume (Part 2) consists of a main part and six annexes.
Annex E is normative. Annexes A, B, C, D, and F are informative.

This standard contains a number of requirements aimed at ensuring the sound execution of distribution

networks for district heating.

The requirements contained in this document should be assessed and applied in compliance with the

intentions of the standard and in due consideration of the development taking place in the field it

concerns. It is therefore assumed that the user of the standard has the requisite technical insight and

that the user of the standard has adequate knowledge of legal and other external regulations that are of

consequence to the practical application of the document.

Some paragraphs of this standard are possibly covered by national regulations in some countries

NOTE
which naturally apply instead of this standard.
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SIST EN 13941-2:2019
EN 13941-2:2019 (E)
1 Scope

This document specifies requirements for design, calculation and installation of factory made thermal

insulated bonded single and twin pipe systems for buried hot water networks for continuous operation

with treated water at various temperatures up to 120 °C and occasionally peak temperatures up to

140 °C for maximum 300 h/a, and maximum internal pressure 2,5 MPa.

Flexible pipe systems according to the EN 15632 series 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) EN 13941-1: Design;
b) EN 13941-2: Installation.

The requirements in this part, EN 13941-2, form a unity with those of EN 13941-1.

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 this higher 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 acc
...

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