Plastics piping systems for the trenchless replacement of underground pipeline networks - Part 1: Replacement on the line by pipe bursting and pipe extraction (ISO 21225-1:2018)

ISO 21225-1:2018 specifies requirements and test methods for pipes and fittings which are part of plastics piping systems for the trenchless replacement of underground non-pressure and pressure drainage and sewerage networks and underground water and gas supply networks, by means of pipe bursting and pipe extraction.
ISO 21225-1:2018 is applicable to polyethylene (PE) pipes and fittings, as manufactured, as well as to the installed replacement system.
ISO 21225-1:2018 is intended to be used in conjunction with standards applicable for the construction of PE pipeline systems where available.
Regarding manufactured pipes it is applicable to three different PE pipe types:
- PE solid wall single layered pipes (nominal outside diameter, dn), including any identification stripes;
- PE pipes with co-extruded layers on either or both the outside and inside of the pipe (total outside diameter, dn), as specified in Annex A, where all layers have the same MRS rating;
- PE pipes (outside diameter, dn) having a peelable, contiguous, thermoplastics additional layer on the outside of the pipe ("coated pipe"), see Annex A.
In addition, ISO 21225-1:2018 is applicable to:
- jointing of pipe lengths by means of butt fusion joint;
- jointing of pipe lengths by means of electrofusion joint;
- fabricated and injection-moulded fittings made of PE.
Pipes made from other plastics, e.g. glass reinforced plastics (GRP), are outside the scope of this document.

Kunststoff-Rohrleitungssysteme zur grabenlosen Erneuerung von erdverlegten Rohrleitungsnetzen - Teil 1: Erneuerung in bisheriger Linienführung durch Berstverfahren und Auswechselverfahren (ISO 21225-1:2018)

Dieses Dokument legt Anforderungen und Prüfverfahren für Rohre und Formstücke fest, die Teil von Kunststoff Rohrleitungssystemen sind und die mithilfe von Rohr Berstverfahren und Rohrersatz mit bisheriger Linienführung zur grabenlosen Erneuerung von verschiedenen erdverlegten Rohrleitungsnetzen, erdverlegten drucklosen Entwässerungsnetzen und Druckentwässerungsnetzen und erdverlegten Wasser  und Gasversorgungsnetzen verwendet werden.
Es gilt für Polyethylen(PE )Rohre und Formstücke „wie hergestellt“ sowie für das eingebaute Erneuerungssystem.
Diese Norm sollte in Verbindung mit Normen verwendet werden, die für die Konstruktion von PE Rohrleitungssystemen gelten, wenn verfügbar.
Bezüglich des hergestellten Rohrs gilt sie für drei verschiedene PE Rohrarten:
—   einschichtige PE Vollwandrohre (Nenn Außendurchmesser, dn), einschließlich jeglicher Kennzeich-nungsstreifen;
—   PE Rohre mit koextrudierten Schichten auf entweder der Innen  oder Außenseite des Rohrs oder beiden (Gesamt Außendurchmesser, dn), wie in Anhang A festgelegt, wobei alle Schichten den gleichen MRS Wert haben;
—   PE Rohre (Außendurchmesser, dn) mit einer abziehbaren, zusammenhängenden, thermoplastischen Zusatzschicht auf der Rohr Außenseite („beschichtetes Rohr“), siehe Anhang A.
Zusätzlich wird betrachtet:
—   Fügen von Rohrlängen durch eine Stumpfschweißverbindung;
—   vorgefertigte und Spritzguss Formstücke aus PE.
ANMERKUNG   Aus anderen Kunststoffen hergestellte Rohre, z. B. GFK, sind nicht im Anwendungsbereich dieses Dokuments enthalten. Die Erneuerung durch Rohrvortrieb wird Gegenstand eines zukünftigen Teils 3

Systèmes de canalisations en plastique pour le remplacement sans tranchée des réseaux de canalisations enterrés - Partie 1: Remplacement sur ligne par éclatement de tuyau et extraction de tuyau (ISO 21225-1:2018)

L'ISO 21225-1:2018 spécifie les exigences et les méthodes d'essai appliquées aux tuyaux et raccords intégrés aux systèmes de canalisations en plastique pour le remplacement sans tranchée des réseaux de branchements et de collecteurs d'assainissement enterrés sans pression et sous pression, ainsi que des réseaux d'alimentation en eau et de distribution de gaz enterrés, par éclatement de tuyau et extraction de tuyau.
L'ISO 21225-1:2018 s'applique aux tuyaux et raccords en polyéthylène (PE), tels que fabriqués, ainsi qu'au système de remplacement, une fois installé.
L'ISO 21225-1:2018 est destiné à être utilisé conjointement avec les normes applicables à la construction de systèmes de canalisations en PE, lorsqu'elles sont disponibles.
Pour ce qui est des tuyaux fabriqués, il s'applique à trois types différents de tuyaux en PE:
- tuyaux en PE monocouches à paroi compacte (diamètre extérieur nominal, dn), y compris les bandes d'identification éventuelles;
- tuyaux en PE avec des couches co-extrudées à l'extérieur et/ou à l'intérieur du tuyau (diamètre extérieur total, dn), tels que spécifiés dans l'Annexe A, toutes les couches ayant la même classification MRS;
- tuyaux en PE (diamètre extérieur, dn) comportant une couche thermoplastique supplémentaire pelable et contiguë à l'extérieur du tuyau («tuyau revêtu»), voir l'Annexe A.
En outre, l'ISO 21225-1:2018 s'applique également:
- à l'assemblage de longueurs de tuyau par soudage bout à bout;
- à l'assemblage de longueurs de tuyau par électrofusion;
- aux raccords en PE façonnés et moulés par injection.
Les tuyaux fabriqués à partir d'autres plastiques, par exemple en plastiques renforcés de verre (PRV), n'entrent pas dans le domaine d'application du présent document.

Cevni sistemi iz polimernih materialov za zamenjavo cevovodnih omrežij, ki so položeni v zemljo, brez izkopa - 1. del: Zamenjava linije z izmenjavo in ekstrakcij cevi (ISO 21225-1:2018)

Ta dokument določa zahteve in preskusne metode za cevi in fitinge, ki so del plastičnih cevnih sistemov za zamenjavo različnih cevovodnih omrežij, ki so položeni v zemljo, podzemnih omrežij za odvodnjavanje in kanalizacijo, ki delujejo po težnostnem principu, ter podzemnih omrežij za oskrbo z vodo in s plinom brez izkopa na podlagi polaganja brez jarka ter ekstrakcije cevi.
Uporablja se za polietilenske (PE) cevi in fitinge, kot so izdelani, ter za nameščeni sistem zamenjave.
Ta standard naj bi se uporabljal v povezavi s standardi za izdelavo cevnih sistemov iz polietilenskih cevi, če so na voljo.
V zvezi z izdelanimi cevmi se uporablja za tri različne vrste polietilenskih cevi:
– PE trdne stenske cevi iz ene plasti (nazivni zunanji premer, dn) s kakršnimi koli identifikacijskimi črtami;
– PE cevi s koekstrudiranimi sloji na zunanji in/ali notranji strani cevi (celotni zunanji premer, dn), kot je opredeljeno v dodatku A, pri čemer imajo vsi sloji enako oceno MRS;
– PE prevlečene cevi (zunanji premer, dn) s termoplastičnim dodatnim slojem, ki ga je mogoče odluščiti, na zunanji strani cevi (»prevlečena cev«), glejte dodatek A.
Poleg tega zajema:
– spajanje dolžin cevi prek soležnega taljenja;
– izdelane in brizgano lite fitinge iz PE.

General Information

Status
Published
Publication Date
29-May-2018
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
30-May-2018
Completion Date
30-May-2018

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SLOVENSKI STANDARD
SIST EN ISO 21225-1:2018
01-november-2018
Cevni sistemi iz polimernih materialov za zamenjavo cevovodnih omrežij, ki so

položeni v zemljo, brez izkopa - 1. del: Zamenjava linije z izmenjavo in ekstrakcij

cevi (ISO 21225-1:2018)

Plastics piping systems for the trenchless replacement of underground pipeline networks

- Part 1: Replacement on the line by pipe bursting and pipe extraction (ISO 21225-

1:2018)
Kunststoff-Rohrleitungssysteme zur grabenlosen Erneuerung von erdverlegten

Rohrleitungsnetzen - Teil 1: Erneuerung in bisheriger Linienführung durch Berstverfahren

und Auswechselverfahren (ISO 21225-1:2018)
Systèmes de canalisations en plastique pour le remplacement sans tranchée des

réseaux de canalisations enterrés - Partie 1: Remplacement sur ligne par éclatement de

tuyau et extraction de tuyau (ISO 21225-1:2018)
Ta slovenski standard je istoveten z: EN ISO 21225-1:2018
ICS:
23.040.20 Cevi iz polimernih materialov Plastics pipes
91.140.80 Drenažni sistemi Drainage systems
SIST EN ISO 21225-1:2018 en

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

---------------------- Page: 1 ----------------------
SIST EN ISO 21225-1:2018
---------------------- Page: 2 ----------------------
SIST EN ISO 21225-1:2018
EN ISO 21225-1
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2018
EUROPÄISCHE NORM
ICS 23.040.20; 23.040.45; 91.140.80
English Version
Plastics piping systems for the trenchless replacement of
underground pipeline networks - Part 1: Replacement on
the line by pipe bursting and pipe extraction (ISO 21225-
1:2018)

Systèmes de canalisations en plastique pour le Kunststoff-Rohrleitungssysteme zur grabenlosen

remplacement sans tranchée des réseaux de Erneuerung von erdverlegten Rohrleitungsnetzen -

canalisations enterrés - Partie 1: Remplacement sur Teil 1: Erneuerung in bisheriger Linienführung durch

ligne par éclatement de tuyau et extraction de tuyau Berstverfahren und Auswechselverfahren (ISO 21225-

(ISO 21225-1:2018) 1:2018)
This European Standard was approved by CEN on 1 March 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

© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21225-1:2018 E

worldwide for CEN national Members.
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SIST EN ISO 21225-1:2018
EN ISO 21225-1:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 21225-1:2018
EN ISO 21225-1:2018 (E)
European foreword

This document (EN ISO 21225-1:2018) has been prepared by Technical Committee ISO/TC 138

“Plastics pipes, fittings and valves for the transport of fluids” in collaboration with Technical Committee

CEN/TC 155 “Plastics piping systems and ducting systems” the secretariat of which is held by NEN.

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 November 2018, and conflicting national standards

shall be withdrawn at the latest by November 2018.

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.

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.
Endorsement notice

The text of ISO 21225-1:2018 has been approved by CEN as EN ISO 21225-1:2018 without any

modification.
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SIST EN ISO 21225-1:2018
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SIST EN ISO 21225-1:2018
INTERNATIONAL ISO
STANDARD 21225-1
First edition
2018-04
Plastics piping systems for
the trenchless replacement of
underground pipeline networks —
Part 1:
Replacement on the line by pipe
bursting and pipe extraction
Systèmes de canalisations en plastique pour le remplacement sans
tranchée des réseaux de canalisations enterrés —
Partie 1: Remplacement sur ligne par éclatement de tuyau et
extraction de tuyau
Reference number
ISO 21225-1:2018(E)
ISO 2018
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SIST EN ISO 21225-1:2018
ISO 21225-1:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 21225-1:2018
ISO 21225-1:2018(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Symbols and abbreviated terms ........................................................................................................................................................... 7

4.1 Symbols ......................................................................................................................................................................................................... 7

4.2 Abbreviated terms ............................................................................................................................................................................... 8

5 Design aspects ......................................................................................................................................................................................................... 8

6 Material selection ................................................................................................................................................................................................ 8

6.1 Pipes and fittings ................................................................................................................................................................................... 8

6.2 Regional requirements for pipes and fittings ............................................................................................................... 8

6.3 Ancillary components ....................................................................................................................................................................... 9

7 Installation practice .......................................................................................................................................................................................... 9

7.1 Preparatory work ................................................................................................................................................................................. 9

7.2 Storage, handling and transport .............................................................................................................................................. 9

7.3 Equipment ................................................................................................................................................................................................10

7.3.1 General...................................................................................................................................................................................10

7.3.2 Inspection equipment ..............................................................................................................................................10

7.3.3 Lifting equipment .........................................................................................................................................................10

7.3.4 Butt fusion equipment and debeading equipment..........................................................................10

7.3.5 Pipe skids/rollers .........................................................................................................................................................10

7.3.6 Winching and rod-pulling equipment ........................................................................................................10

7.3.7 Pipe bursting equipment .......................................................................................................................................11

7.3.8 Pipe extraction equipment ...................................................................................................................................11

7.3.9 Electrofusion equipment .......................................................................................................................................12

7.4 Installation ...............................................................................................................................................................................................12

7.4.1 General...................................................................................................................................................................................12

7.4.2 Disconnection from the existing pipeline................................................................................................13

7.5 Process-related inspection and testing ...........................................................................................................................13

7.6 Finishing off ............................................................................................................................................................................................13

7.7 Reconnection to the existing pipeline system ...........................................................................................................13

8 Fitness for purpose .........................................................................................................................................................................................13

8.1 General ........................................................................................................................................................................................................13

8.2 Final inspection ...................................................................................................................................................................................14

8.3 Pressure testing ...................................................................................................................................................................................14

8.4 Disinfection .............................................................................................................................................................................................14

8.5 Documentation ....................................................................................................................................................................................14

Annex A (normative) Layered pipes ...................................................................................................................................................................15

Annex B (informative) Pipe design considerations particular to pipe bursting and

pipe extraction .....................................................................................................................................................................................................16

Bibliography .............................................................................................................................................................................................................................18

© ISO 2018 – All rights reserved iii
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SIST EN ISO 21225-1:2018
ISO 21225-1:2018(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

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

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www .iso .org/ iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for

the transport of fluids, Subcommittee SC 8, Rehabilitation of pipeline systems.
A list of all the parts in the ISO 21225 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
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SIST EN ISO 21225-1:2018
ISO 21225-1:2018(E)
Introduction

System standards dealing with the following applications are either available or in preparation for

pipeline renovation:

— The ISO 11296 series: Plastics piping systems for renovation of underground non-pressure drainage

and sewerage networks;

— The ISO 11297 series: Plastics piping systems for renovation of underground drainage and sewerage

networks under pressure;

— The ISO 11298 series: Plastics piping systems for renovation of underground water supply networks;

— The ISO 11299 series: Plastics piping systems for renovation of underground gas supply networks.

System standards dealing with all application areas are either available or in preparation for trenchless

pipeline replacement:

— The ISO 21225 series: Plastics piping systems for the trenchless replacement of underground pipeline

networks.
The system standard ISO 21225 comprises:

— Part 1: Replacement on the line by pipe bursting and pipe extraction (this document);

— Part 2: Replacement off the line by horizontal directional drilling and impact moling.

The requirements for technique families are given in ISO 21225-1 and ISO 21225-2 respectively. For

[1]
complimentary information, see ISO 11295 .

A consistent structure of clause headings has been adopted for all parts to facilitate direct comparisons

across replacement standards.

Figure 1 shows the common part and clause structure and the relationship between ISO 21255 and the

system standards for the renovation application areas.
© ISO 2018 – All rights reserved v
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SIST EN ISO 21225-1:2018
ISO 21225-1:2018(E)
Figure 1 — Technique families and clause structure
vi © ISO 2018 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 21225-1:2018
INTERNATIONAL STANDARD ISO 21225-1:2018(E)
Plastics piping systems for the trenchless replacement of
underground pipeline networks —
Part 1:
Replacement on the line by pipe bursting and pipe
extraction
1 Scope

This document specifies requirements and test methods for pipes and fittings which are part of plastics

piping systems for the trenchless replacement of underground non-pressure and pressure drainage and

sewerage networks and underground water and gas supply networks, by means of pipe bursting and

pipe extraction.

It is applicable to polyethylene (PE) pipes and fittings, as manufactured, as well as to the installed

replacement system.

This document is intended to be used in conjunction with standards applicable for the construction of

PE pipeline systems where available.
Regarding manufactured pipes it is applicable to three different PE pipe types:

— PE solid wall single layered pipes (nominal outside diameter, d ), including any identification stripes;

— PE pipes with co-extruded layers on either or both the outside and inside of the pipe (total outside

diameter, d ), as specified in Annex A, where all layers have the same MRS rating;

— PE pipes (outside diameter, d ) having a peelable, contiguous, thermoplastics additional layer on the

outside of the pipe (“coated pipe”), see Annex A.
In addition it is applicable to:
— jointing of pipe lengths by means of butt fusion joint;
— jointing of pipe lengths by means of electrofusion joint;
— fabricated and injection-moulded fittings made of PE.

Pipes made from other plastics, e.g. glass reinforced plastics (GRP), are outside the scope of this

document.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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.

ISO 4427 (all parts), Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply

ISO 4437 (all parts), Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE)

ISO 4633, Rubber seals — Joint rings for water supply, drainage and sewerage pipelines — Specification for

materials
© ISO 2018 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 21225-1:2018
ISO 21225-1:2018(E)

ISO 8772, Plastics piping systems for non-pressure underground drainage and sewerage — Polyethylene (PE)

ISO 12176-1, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 1:

Butt fusion

ISO 12176-2, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 2:

Electrofusion

ISO 16010, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gaseous

fuels and hydrocarbon fluids

EN 681-1, Elastomeric seals — Material requirements for pipe joint seals used in water and drainage

applications — Part 1: Vulcanized rubber

EN 681-2, Elastomeric seals — Material requirements for pipe joint seals used in water and drainage

applications — Part 2: Thermoplastic elastomers

EN 681-3, Elastomeric seals — Material requirements for pipe joint seals used in water and drainage

applications — Part 3: Cellular materials of vulcanized rubber

EN 681-4, Elastomeric seals — Material requirements for pipe joint seals used in water and drainage

applications — Part 4: Cast polyurethane sealing elements

EN 682, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gas and

hydrocarbon fluids

EN 1555-1, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 1: General

EN 1555-2, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes

EN 1555-3, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings

EN 1555-5, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 5: Fitness for

purpose of the system

EN 12201-1, Plastics piping systems for water supply, and for drainage and sewerage under pressure —

Polyethylene (PE) — Part 1: General

EN 12201-2, Plastics piping systems for water supply, and for drainage and sewerage under pressure —

Polyethylene (PE) — Part 2: Pipes

EN 12201-3, Plastics piping systems for water supply, and for drainage and sewerage under pressure —

Polyethylene (PE) — Part 3: Fittings

EN 12201-5, Plastics piping systems for water supply, and for drainage and sewerage under pressure —

Polyethylene (PE) — Part 5: Fitness for purpose of the system

EN 12666-1, Plastics piping systems for non-pressure underground drainage and sewerage — Polyethylene

(PE) — Part 1: Specifications for pipes, fittings and the system
3 Terms and definitions
For the purposes of this document the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1 General
2 © ISO 2018 – All rights reserved
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SIST EN ISO 21225-1:2018
ISO 21225-1:2018(E)
3.1.1
CCTV system

system comprised of cameras, recorders, interconnections and displays that are used to inspect

pipelines
3.1.2
characteristic
property, dimension or other feature of a material or component
3.1.3
coated pipe

pipe with a peelable, contiguous thermoplastic additional layer on the outside of the pipe

3.1.4
installed pipe
replacement pipe after installation
3.1.5
maintenance
routine work undertaken to ensure the continuing performance of an asset
3.1.6
pipe with co-extruded layers

pipe with smooth internal and external surface, having co-extruded layers on either or both the outside

and inside of the pipe, where all layers have the same MRS rating
3.1.7
pipeline system
interconnecting pipe network for the conveyance of fluids
3.1.8
rehabilitation

measures for restoring or upgrading the performance of existing pipeline systems, including renovation,

repair and replacement
3.1.9
renovation

work incorporating all or part of the original fabric of the pipeline, by means of which its current

performance is improved
3.1.10
repair
rectification of local damage
3.1.11
replacement

construction of a new pipeline, on or off the line of an existing pipeline, where the function of the new

pipeline system incorporates that of the old
3.1.12
replacement pipe
new pipe installed for rehabilitation purposes
3.1.13
replacement system

replacement pipe and all relevant fittings for trenchless replacement on or off an existing pipeline for

the purposes of rehabilitation
© ISO 2018 – All rights reserved 3
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SIST EN ISO 21225-1:2018
ISO 21225-1:2018(E)
3.1.14
solid wall single layered pipe

pipe with smooth internal and external surface, extruded from the same compound/formulation

throughout the wall
3.1.15
system test pressure
STP

pressure applied to the installed pipeline system in order to ensure its integrity and leaktightness

3.1.16
technique family

group of renovation or trenchless replacement techniques which are considered to have common

characteristics for standardization purposes
3.1.17
trenchless replacement

replacement without opening trenches other than small excavations to provide access for the particular

technique
3.2 Techniques

The various techniques for trenchless replacement of underground networks, within the scope of

pipeline rehabilitation techniques generally, are shown schematically in Figure 2.

Definitions of technique families outside the scope of this document are given in ISO 11295.

The technique families within the scope of this document are defined as follows.
3.2.1
bursting head
tool that can crack or split the existing pipe material

Note 1 to entry: Brittle pipe materials such as clay or grey cast iron crack. Ductile pipe materials such as ductile

iron, steel or PVC-U split.
3.2.2
pipe bursting

on the line replacement method in which an existing pipe is broken by longitudinal splitting or brittle

fracture, using a mechanically applied force from within, where the pipe fragments are forced into the

surrounding ground and a new pipe of the same, smaller or larger diameter, is simultaneously pulled in

3.2.3
pipe extraction

on the line replacement method in which an existing pipeline is extracted by pulling or pushing and

replaced with a new pipe of the same, smaller or larger diameter, is simultaneously pulled or pushed in

4 © ISO 2018 – All rights reserved
---------------------- Page: 16 ----------------------
SIST EN ISO 21225-1:2018
ISO 21225-1:2018(E)
This document is applicable.
In scope of ISO 21225-2.
c [1]
Outside scope of ISO 21225, see ISO 11295 .

Figure 2 — Technique families for trenchless replacement of underground pipeline networks

using plastics pipes, within the scope of pipeline rehabilitation techniques
3.3 Geometrics
3.3.1
minimum bending radius

minimum radius at any point throughout the length of the pipeline, measured to the longitudinal axis

of the pipe
Note 1 to entry: This is usually expressed as a multiple of the pipe diameter.
3.3.2
minimum mean outside diameter
em,min
minimum value of the mean outside diameter as specified for a given nominal size
[SOURCE: ISO 4427-1:2007, 3.1.1.6]
© ISO 2018 – All rights reserved 5
---------------------- Page: 17 ----------------------
SIST EN ISO 21225-1:2018
ISO 21225-1:2018(E)
3.3.3
minimum wall thickness at any point
min

minimum value of the wall thickness at any point around the circumference of a component as specified

[SOURCE: ISO 4427-1:2007, 3.1.1.11]
3.3.4
nominal outside diameter
specified outside diameter, in millimetres, assigned to a nominal size DN/OD

Note 1 to entry: For thermoplastics solid-wall components, the value of nominal outside diameter is identical to

the minimum mean outside diameter, d .
em,min
[SOURCE: ISO 4427-1:2007, 3.1.1.3, modified by addition of Note 1 to entry.]
3.3.5
nominal thickness of the coating
coating

arithmetic mean of a number of measurements of the coating thickness around the circumference and

in the same cross-section of a component
3.3.6
nominal wall thickness

numerical designation of the wall thickness of a component, which is a convenient round number,

approximately equal to the manufacturing dimension in millimetres
Note 1 to entry: For thermoplastics solid-wa
...

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