District heating pipes - Pre-insulated flexible pipe systems - Part 1: Classification, general requirements and test methods

This European Standard provides classification, general requirements and test methods for flexible, pre-insulated, directly buried district heating pipe systems.
It is intended to be used in conjunction with parts 2, 3, 4, and 5.
Depending on the pipe assembly (see Table 4), this European Standard is valid for maximum operating temperatures of 95 °C to 140 °C and operating pressures of 6 bar to 25 bar.
The pipe systems are designed for a lifetime of 30 years. For pipe systems with plastic service pipes, the respective temperature profiles are defined in EN 15632-2 and EN 15632-3.
NOTE   For the transport of other liquids, for example potable water, additional requirements may be applicable.

Fernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 1: Klassifikation, allgemeine Anforderungen und Prüfungen

Diese Europäische Norm enthält die Klassifikation, allgemeine Anforderungen und Prüfverfahren für flexible werkmäßig gedämmte direkt erdverlegte Fernwärmenetze.
Sie ist für die Anwendung in Verbindung mit den Teilen 2, 3 oder 4 vorgesehen.
In Abhängigkeit von der Rohrbaugruppe (siehe Tabelle 4) gilt diese Europäische Norm für maximale Betriebs¬temperaturen von 95 °C bis 140 °C und Betriebsdrücke von 6 bar bis 25 bar.
Die Rohrsysteme sind für eine Lebensdauer von 30 Jahren ausgelegt. Für Rohrsysteme mit Mediumrohren aus Kunststoff sind die entsprechenden Temperaturprofile in EN 15632 2 und EN 15632 3 festgelegt.
ANMERKUNG   Für den Transport von anderen Flüssigkeiten, wie z. B. Trinkwasser, können zusätzliche Anforderungen gelten.

Tuyaux de chauffage urbain - Systèmes de tuyaux flexibles préisolés - Partie 1: Classification, prescriptions générales et méthodes d'essai

La présente Norme européenne fournit la classification, les prescriptions générales et les méthodes d’essai pour les systèmes de réseaux de tuyaux de chauffage urbain flexibles préisolés enterrés directement.
Elle est prévue pour être utilisée conjointement avec les Parties 2, 3, 4 et 5.
Suivant le tuyau préisolé (voir Tableau 4), la présente Norme européenne est valable pour des températures maximales de service de 95 °C à 140 °C et des pressions de service de 6 bar à 25 bar.
Les systèmes de tuyaux sont conçus pour une durée de vie de 30 ans. Pour les systèmes de tuyaux avec des tubes de service en plastique, les profils de température respectifs sont définis dans l’EN 15632-2 et l’EN 15632-3.
NOTE   Pour le transport d’autres liquides, par exemple de l’eau potable, des prescriptions supplémentaires peuvent s’appliquer.

Cevi za daljinsko ogrevanje - Izolirani gibki cevni sistemi - 1. del: Klasifikacija, splošne zahteve in preskusne metode

Ta evropski standard določa klasifikacijo, splošne zahteve in preskusne metode za izolirane, gibke, podzemne cevne sisteme za daljinsko ogrevanje.
Standard je treba uporabljati v povezavi z deli 2, 3, 4 in 5.
Glede na cevni sestav (glej tabelo 4) ta evropski standard velja za najvišje obratovalne temperature od 95 °C do 140 °C in obratovalne tlake od 6 to 25 barov.
Življenjska doba cevnih sistemov je 30 let. Temperaturni razponi za cevne sisteme s plastičnimi oskrbovalnimi cevmi so določeni v standardih EN 15632-2 in EN 15632-3.
OPOMBA Za prevoz drugih tekočin, na primer pitne vode, morda veljajo dodatne zahteve.

General Information

Status
Withdrawn
Publication Date
16-Dec-2014
Current Stage
9960 - Withdrawal effective - Withdrawal
Completion Date
11-May-2022

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SLOVENSKI STANDARD
SIST EN 15632-1:2009+A1:2015
01-februar-2015

Cevi za daljinsko ogrevanje - Izolirani gibki cevni sistemi - 1. del: Klasifikacija,

splošne zahteve in preskusne metode

District heating pipes - Pre-insulated flexible pipe systems - Part 1: Classification,

general requirements and test methods

Fernwärmerohre - Werkmäßig gedämmte flexible Rohrsysteme - Teil 1: Klassifikation,

allgemeine Anforderungen und Prüfungen
Tuyaux de chauffage urbain - Systèmes de tuyaux flexibles préisolés - Partie 1:
Classification, prescriptions générales et méthodes d'essai
Ta slovenski standard je istoveten z: EN 15632-1:2009+A1:2014
ICS:
23.040.01 Deli cevovodov in cevovodi Pipeline components and
na splošno pipelines in general
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
SIST EN 15632-1:2009+A1:2015 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN 15632-1:2009+A1:2015
---------------------- Page: 2 ----------------------
SIST EN 15632-1:2009+A1:2015
EUROPEAN STANDARD
EN 15632-1:2009+A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2014
ICS 23.040.01 Supersedes EN 15632-1:2009
English Version
District heating pipes - Pre-insulated flexible pipe systems - Part
1: Classification, general requirements and test methods

Tuyaux de chauffage urbain - Systèmes de tuyaux flexibles Fernwärmerohre - Werkmäßig gedämmte flexible

préisolés - Partie 1: Classification, prescriptions générales Rohrsysteme - Teil 1: Klassifikation, allgemeine

et méthodes d'essai Anforderungen und Prüfungen

This European Standard was approved by CEN on 5 December 2008 and includes Amendment 1 approved by CEN on 8 November 2014.

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, 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: Avenue Marnix 17, B-1000 Brussels

© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 15632-1:2009+A1:2014 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 15632-1:2009+A1:2015
EN 15632-1:2009+A1:2014 (E)
Contents Page

Foreword ..............................................................................................................................................................4

Introduction .........................................................................................................................................................5

1 Scope ......................................................................................................................................................6

2 Normative references ............................................................................................................................6

3 Terms and definitions ...........................................................................................................................7

4 Classification ....................................................................................................................................... 12

5 Requirements ...................................................................................................................................... 12

5.1 Thermal insulation properties ........................................................................................................... 12

5.2 Flexibility ............................................................................................................................................. 12

5.3 Resistance to external actions .......................................................................................................... 13

5.4 Insulation Layer .................................................................................................................................. 13

5.4.1 Compressive creep ............................................................................................................................. 13

5.4.2 Water absorption at elevated temperatures ..................................................................................... 13

5.5 Casing .................................................................................................................................................. 13

5.5.1 UV stability .......................................................................................................................................... 13

5.5.2 Thermal stability ................................................................................................................................. 13

5.5.3 Stress crack resistance ...................................................................................................................... 13

5.5.4 Use of rework material ....................................................................................................................... 14

5.6 Surveillance systems ......................................................................................................................... 14

6 Test methods ....................................................................................................................................... 14

6.1 General ................................................................................................................................................. 14

6.2 Flexibility ............................................................................................................................................. 14

6.3 Compressive creep ............................................................................................................................. 15

6.3.1 General ................................................................................................................................................. 15

6.3.2 Principles of testing ........................................................................................................................... 16

6.3.3 Test apparatus .................................................................................................................................... 16

6.3.4 Test sample ......................................................................................................................................... 17

6.3.5 Test procedure .................................................................................................................................... 18

6.3.6 Calculation and expression of results .............................................................................................. 18

7 Marking ................................................................................................................................................ 20

7.1 General marking aspects ................................................................................................................... 20

7.2 Minimum marking information .......................................................................................................... 20

8 Manufacturer's information ............................................................................................................... 20

Annex A (normative) !Thermal conductivity of pre-insulated pipes – Test procedure" ................... 21

A.1 General ................................................................................................................................................. 21

A.2 Requirements ...................................................................................................................................... 21

A.2.1 Test specimen ..................................................................................................................................... 21

A.2.2 Operating temperature ....................................................................................................................... 21

A.2.3 Types of apparatus ............................................................................................................................. 21

A.3 Apparatus ............................................................................................................................................ 21

A.3.1 Guarded end apparatus ..................................................................................................................... 21

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SIST EN 15632-1:2009+A1:2015
EN 15632-1:2009+A1:2014 (E)

A.3.2 Calibrated end apparatus ................................................................................................................... 22

A.3.3 Dimensions .......................................................................................................................................... 22

A.3.4 Heater pipe surface temperature ....................................................................................................... 22

A.4 Test specimens .................................................................................................................................... 22

A.4.1 Conditioning ........................................................................................................................................ 22

A.4.2 Surface temperature measurement ................................................................................................... 22

A.4.3 Location of temperature sensors ...................................................................................................... 22

A.5 Procedure ............................................................................................................................................. 22

A.5.1 Test length ........................................................................................................................................... 22

A.5.2 Diameter and dimension measurement ............................................................................................ 22

A.5.3 Thickness of casing ............................................................................................................................ 23

A.5.4 Ambient requirements ........................................................................................................................ 23

A.5.5 Test pipe temperature ......................................................................................................................... 24

A.5.6 Power supply ....................................................................................................................................... 24

A.5.7 Axial heat loss ..................................................................................................................................... 24

A.5.8 Test period and stability ..................................................................................................................... 24

A.6 Calculations - Thermal conductivity .................................................................................................. 24

Annex B (normative) !Calculation of the heat flow from the medium to the ambient loss of pre-

insulated buried district heating pipes" ........................................................................................ 26

B.1 General ................................................................................................................................................. 26

B.2 Calculations ......................................................................................................................................... 26

B.2.1 Single pipe system (SPS) ................................................................................................................... 26

B.2.2 Twin pipe system (TPS) ...................................................................................................................... 27

B.2.3 Radial thermal resistance of the surrounding soil .......................................................................... 27

B.3 Declared values of the radial thermal resistance of buried pipe systems .................................... 27

Annex C (!informative") Determination of design values for the radial thermal resistance .............. 28

Annex D (informative) !Guideline for testing" ........................................................................................ 29

D.1 General ................................................................................................................................................. 29

D.2 Tests ..................................................................................................................................................... 29

D.2.1 Type test (Qualification test) .............................................................................................................. 29

D.2.2 Quality surveillance test ..................................................................................................................... 30

D.2.3 Production test .................................................................................................................................... 30

Bibliography ...................................................................................................................................................... 31

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SIST EN 15632-1:2009+A1:2015
EN 15632-1:2009+A1:2014 (E)
Foreword

This document (EN 15632-1:2009+A1:2014) has been prepared by Technical Committee CEN/TC 107

“Prefabricated district heating 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 June 2015, and conflicting national standards shall be withdrawn at

the latest by June 2015.

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

rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 15632-1:2009.
This document includes Amendment 1 approved by CEN on 2014-11-08.

The start and finish of text introduced or altered by amendment is indicated in the text by tags !".

This document is one of a series of standards which form several parts of EN 15632, District heating pipes —

Pre-insulated flexible pipe systems:
Part 1: Classification, general requirements and test methods;
Part 2: Bonded system with plastic service pipes; requirements and test methods;

Part 3: Non bonded system with plastic service pipes; requirements and test methods;

Part 4: Bonded system with metal service pipes; requirements and test methods.

According to the CEN-CENELEC Internal Regulations, the national standards organizations 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.

---------------------- Page: 6 ----------------------
SIST EN 15632-1:2009+A1:2015
EN 15632-1:2009+A1:2014 (E)
Introduction

Flexible pipe systems in district heating networks are of common technical usage. In order to assure quality

including product-related lifetime, to assure safety in use, economical energy usage and to facilitate

comparability in the market, CEN/TC 107 decided to set up standards for these products.

---------------------- Page: 7 ----------------------
SIST EN 15632-1:2009+A1:2015
EN 15632-1:2009+A1:2014 (E)
1 Scope

This European Standard provides classification, general requirements and test methods for flexible, pre-

insulated, directly buried district heating pipe systems.
It is intended to be used in conjunction with parts 2, 3, 4, and 5.

Depending on the pipe assembly (see Table 4), this European Standard is valid for maximum operating

temperatures of 95 °C to 140 °C and operating pressures of 6 bar to 25 bar.

The pipe systems are designed for a lifetime of 30 years. For pipe systems with plastic service pipes, the

respective temperature profiles are defined in EN 15632-2 and EN 15632-3.

NOTE For the transport of other liquids, for example potable water, additional requirements may be applicable.

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+A1:2013", 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 489, District heating pipes — Preinsulated bonded pipe systems for directly buried hot water networks —

Joint assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene

EN 728, Plastics piping and ducting systems — Polyolefin pipes and fittings — Determination of oxidation

induction time

EN 744, Plastics piping and ducting systems — Thermoplastics pipes — Test method for resistance to

external blows by the round-the-clock method

EN 1605, Thermal insulating products for building applications — Determination of deformation under

specified compressive load and temperature conditions

EN 1606, Thermal insulating products for building applications — Determination of compressive creep

EN 12085, Thermal insulating products for building applications — Determination of linear dimensions of test

specimens

EN 12667, Thermal performance of building materials and products — Determination of thermal resistance by

means of guarded hot plate and heat flow meter methods — Products of high and medium thermal resistance

EN 13941, Design and installation of preinsulated bonded pipe systems for district heating

EN 14419:2003, District heating pipes — Pre-insulated bonded pipe systems for directly buried hot water

networks — Surveillance systems

EN 60811-4-1:2004, Insulating and sheathing of electric and optical cables — Common test methods Part 4-1:

Methods specific to polyethylene and polypropylene compounds — Resistance to environmental stress

cracking — Measurement of the melt flow index — Carbon black and/or mineral filler content measurement in

---------------------- Page: 8 ----------------------
SIST EN 15632-1:2009+A1:2015
EN 15632-1:2009+A1:2014 (E)

polyethylene by direct combustion — Measurement of carbon black content by thermogravimetric analysis

(TGA) — Assessment of carbon black dispersion in polyethylene using a microscope (IEC 60811-4-1:2004)

EN ISO 8497, Thermal insulation — Determination of steady-state thermal transmission properties of thermal

insulation for circular pipes (ISO 8497:1994)
EN ISO 9967, Thermoplastics pipes — Determination of creep ratio (ISO 9967:2007)

EN ISO 9969, Thermoplastics pipes — Determination of ring stiffness (ISO 9969:2007)

EN ISO 16871, Plastics piping and ducting systems — Plastics pipes and fittings — Method for exposure to

direct (natural) weathering (ISO 16871:2003)

EN ISO 23993, Thermal insulation products for building equipment and industrial installations —

Determination of design thermal conductivity (ISO 23993:2008)

ISO 6964, Polyolefin pipes and fittings — Determination of carbon black content by calcination and

pyrolysis — Test method and basic specification

ISO 16770, Plastics — Determination of environmental stress cracking (ESC) of polyethylene — Full-notch

creep test (FNCT)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in !EN 253:2009+A1:2013",

EN 14419:2003 and the following apply.
3.1
lifetime

time during which the flexible pipe system operates without failure at the designated operating temperature

3.2
continuous operating temperature

temperature of the heat medium for which the system has been designed to operate continuously

NOTE See Table 4
3.3
maximum operating temperature
exceptionally high operating temperature occurring for short periods only
3.4
operating pressure
pressure at which the hot water network is designed to operate continuously
3.5
service pipe
medium carrying pipe which is in contact with warm water
3.6
outer casing

separately applied outer layer of the pipe assembly, protecting the construction during installation and

protecting the construction against external influences (after installation)
---------------------- Page: 9 ----------------------
SIST EN 15632-1:2009+A1:2015
EN 15632-1:2009+A1:2014 (E)
3.7
insulation layer
layer which provides the designated thermal characteristics of the pipe assembly
3.8
pipe assembly

assembled product, consisting of at least one service pipe, insulating material and casing

3.9
pipe system

pipe assembly, plus service pipe fittings, casing joints, and other components like surveillance elements

3.10
single pipe system
SPS
pipe system with one service pipe
3.11
twin pipe system
TPS
pipe system with two service pipes
3.12
bonded system

service pipe, insulating material and casing which are bonded by the insulating material

3.13
non bonded system

service pipe, insulating material and casing which are not bonded by the insulating material

3.14
casing joint assembly
casing joint

assembled product, consisting of at least insulating material and casing, designed to protect and thermally

insulate a service pipe joint
3.15
ageing factor

factor without a dimension which expresses the ageing of the insulating layer in relation to the expected

lifetime
3.16
moisture factor

factor without a dimension for the influence of moisture on the insulating layer in relation to the expected

lifetime

NOTE The term 'moisture' as it is used here is not identical with the term 'moisture' as it is used in EN 14419.

3.17
ovality

difference between the maximum and minimum diameter at a cross section expressed as a percentage of the

minimum diameter
---------------------- Page: 10 ----------------------
SIST EN 15632-1:2009+A1:2015
EN 15632-1:2009+A1:2014 (E)
!Table 1 — Symbols, definitions and dimensions
Symbol Description Unit
A projected area of the service pipe m
d inner diameter of the service pipe m
d inner diameter of the service pipe at the crest of a corrugation m
1,c
d inner diameter of the service pipe at the trough of a corrugation m
1,t
d outer diameter of the service pipe m
d outer diameter of the service pipe at the crest of a corrugation m
2,c
d outer diameter of the service pipe at the trough of a corrugation m
2,t
d inner diameter of the casing m
d inner diameter of the casing at the crest of a corrugation m
3,c
d inner diameter of the casing at the trough of a corrugation m
3,t
d outer diameter of the casing m
d outer diameter of the casing at the crest of a corrugation m
4,c
d outer diameter of the casing at the trough of a corrugation m
4,t
F force N
f ageing factor /
f corrective factor for differences between calculated and measured thermal /
cor
conductivities
F force resulting from heat expansion N
exp
f moisture factor /
F weight force N
weight
g acceleration due to gravity m/s
H earth covering m
L length of the test specimen m
M mass of the pipe inclusively the water inside kg

P area related load on the insulation resulting from heat expansion of the service pipe Pa

exp
P test load Pa
test

P area related load on the cross section of the test specimen of the insulation material Pa

weight
q heat flow rate W/m
q radial heat flow rate for buried single pipe system in the flow pipe W/m

q radial heat flow rate for buried single pipe system in the flow and return pipe W/m

f+r
q radial heat flow rate for buried single pipe system in the return pipe W/m
q radial heat flow rate for buried twin pipe system W/m
TPS
Q heat flow W
r bending radius in the axis of the pipe m
R radial thermal resistance mK/W
R thermal transmittance factor from earth surface to ambient air m K/W
R design value for the radial resistance mK/W
design
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SIST EN 15632-1:2009+A1:2015
EN 15632-1:2009+A1:2014 (E)
Symbol Description Unit
R radial thermal resistance of the flow pipe mK/W
R radial thermal resistance of the return pipe mK/W
R radial thermal resistance of the soil mK/W
R radial thermal resistance of a twin pipe system mK/W
TPS
s thickness mm
s thickness of test piece after load testing and temperature testing mm
STB
t thickness of the casing m
U coefficient of heat loss W/(mK)
U coefficient of heat loss for buried single pipe system W/(mK)

U coefficient of heat loss for buried single pipe system in the return pipe W/(mK)

U coefficient of heat loss in a twin pipe system W/(mK)
TPS
Z depth of laying distance from the centre line of the pipe to the surface m

Z corrected minimum value for thermal transmittance on the surface of the earth m

cor
λ thermal conductivity at 50 °C W/(mK)
λ thermal conductivity of the casing W/(mK)
λ declared thermal conductivity of a pipe system W/(mK)
decl

λ calculation value of the thermal conductivity of the insulation material W/(mK)

design
λ thermal conductivity of the insulation W/(mK)
λ thermal conductivity of the soil W/(mK)
soil
λ thermal conductivity of the service pipe W/(mK)
λ thermal conductivity of steel W/(mK)
steel
λ thermal conductivity of a twin pipe system at any average temperature W/(mK)
TPS,ϑav
ϑ temperature at the inner diameter of the service pipe K
ϑ temperature at the inner diameter of the service flow pipe K
1,f
ϑ temperature at the inner diameter of the service return pipe K
1,r
ϑ temperature at the outer diameter of the service pipe K
ϑ temperature at the outer diameter of the casing K
ϑ ambient temperature K
amb
ϑ average temperature K
ϑ flow temperature K
ϑ mean temperature of the insulation K
i, mean
ϑ return temperature K
ϑ temperature of the soil K
Σ compression mm
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SIST EN 15632-1:2009+A1:2015
EN 15632-1:2009+A1:2014 (E)
Table 2 — Indices
Symbol Definition
0 thermal transmittance (from earth surface to ambient air)
1 position at the inner diameter of the service pipe
2 position at the outer diameter of the service pipe
3 position at the inner diameter of the casing
4 position at the outer diameter of the casing
!50 at 50 °C"
a ageing
amb ambient
av average
ax axial
c crest of a corrugation
C casing bzw. casing pipe
cor corrective
decl declared
design design
exp expansion
f flow
I insulation
m moisture
!mean mean"
!min minutes"
r return
S service pipe
s soil
!steel steel"
STB stability
t trough of a corrugation
test test
TPS twin Pipe System
weight weight
x placeholder for 1,2,3 or 4
ϑ average temperature
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SIST EN 15632-1:2009+A1:2015
EN 15632-1:2009+A1:2014 (E)
Table 3 — Abbreviations
Abbreviation Name
PB polybutylene
PE-HD high density polyethylene
PE-LD low density polyethylene
!PE-LLD linear low density polyethylene"
PE-X cross linked polyethylene
!deleted text"
4 Classification

With Table 4 the field of application for the different designs of pipe assembly are defined.

Table 4 — Classification system
Part of Service pipe Pipe assembly Field of application
this material design
Operating Continuous Maximum
standard
pressure bar operating operating
temperature temperature
°C °C
plastics bonded
2 6, 8 or 10 80 95
plastics non bonded
3 6, 8 or 10 80 95
metal bonded
4 16 or 25 120 140
For operating pressures and temperature/time profiles see part 2, 3 or 4.
5 Requirements
5.1 Thermal insulation properties

The manufacturer shall submit values for the heat loss of buried pipe assemblies for all pipe dimensions in

accordance with !Annex B", rounded to !0,1 W/m".

!NOTE Annex A specifies how to measure thermal properties, and Annex C informs about ageing effects."

5.2 Flexibility

The flexibility of the pipe assembly is verified by testing at the minimum bending radius. The manufacturer of

the pipe assembly shall
...

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