EN ISO 11295:2017

SLOVENSKI STANDARD
01-februar-2018
1DGRPHãþD
SIST EN ISO 11295:2010
Razvrstitev in informacije o projektiranju in uporabi cevnih sistemov iz polimernih
materialov za obnovo in zamenjavo (ISO 11295:2017)
Classification and information on design and applications of plastics piping systems used
for renovation and replacement (ISO 11295:2017)
Klassifizierung und Informationen zur Planung und Anwendung von Kunststoff-
Rohrleitungssystemen für die Renovierung und Erneuerung (ISO 11295:2017)
Classification et informations relatives à la conception et aux applications des systèmes
de canalisation en plastique destinés à la rénovation et au remplacement (ISO
11295:2017)
Ta slovenski standard je istoveten z: EN ISO 11295:2017
ICS:
01.110 7HKQLþQDGRNXPHQWDFLMD]D Technical product
L]GHONH documentation
23.040.01 Deli cevovodov in cevovodi Pipeline components and
na splošno pipelines in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 11295
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2017
EUROPÄISCHE NORM
ICS 23.040.01 Supersedes EN ISO 11295:2010
English Version
Classification and information on design and applications
of plastics piping systems used for renovation and
replacement (ISO 11295:2017)
Classification et informations relatives à la conception Klassifizierung und Informationen zur Planung und
et aux applications des systèmes de canalisation en Anwendung von Kunststoff-Rohrleitungssystemen für
plastique destinés à la rénovation et au remplacement die Renovierung und Erneuerung (ISO 11295:2017)
(ISO 11295:2017)
This European Standard was approved by CEN on 10 September 2017.

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
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11295:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 11295:2017) 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 June 2018 and conflicting national standards shall be
withdrawn at the latest by June 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.
This document supersedes EN ISO 11295:2010.
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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 11295:2017 has been approved by CEN as EN ISO 11295:2017 without any modification.
INTERNATIONAL ISO
STANDARD 11295
Second edition
2017-11
Classification and information on
design and applications of plastics
piping systems used for renovation
and replacement
Classification et informations relatives à la conception et aux
applications des systèmes de canalisations en plastique destinés à la
rénovation et au remplacement
Reference number
ISO 11295:2017(E)
©
ISO 2017
ISO 11295:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

ISO 11295:2017(E)
Contents Page
Foreword .v
Introduction .vi
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Abbreviated terms .5
5 Classification of renovation and replacement techniques .6
6 Classification of renovation techniques . 7
6.1 General . 7
6.2 Lining with continuous pipes . 7
6.3 Lining with close-fit pipes . 9
6.4 Lining with cured-in-place pipes .11
6.5 Lining with discrete pipes .14
6.6 Lining with adhesive-backed hoses .16
6.7 Lining with spirally-wound pipes .18
6.8 Lining with pipe segments .20
6.9 Lining with a rigidly anchored plastics inner layer .22
6.10 Lining with sprayed polymeric materials .23
6.11 Lining with inserted hoses.25
7 Classification of trenchless replacement techniques .26
7.1 General .26
7.2 Pipe bursting .26
7.3 Pipe removal .29
7.3.1 General.29
7.3.2 Pipe eating .29
7.3.3 Pipe extraction .29
7.4 Horizontal directional drilling — HDD .31
7.5 Impact moling .34
7.6 Pipe jacking .35
7.6.1 General.35
7.6.2 Auger boring .35
7.6.3 Microtunnelling .36
8 Information on design .38
8.1 General .38
8.2 Condition assessment .38
8.2.1 General.38
8.2.2 Pipeline condition affecting functional performance .39
8.2.3 Site conditions affecting design .40
8.3 System functions .40
8.3.1 Renovation .40
8.3.2 Replacement .41
8.4 Performance criteria .41
8.4.1 Structural performance.41
8.4.2 Hydraulic performance .45
8.5 Other factors affecting technique family selection .45
9 Aspects affecting installation .46
9.1 Site conditions affecting installation .46
9.1.1 Working space requirements .46
9.1.2 Environmental impact .46
9.1.3 Assessment of site conditions .47
9.2 Work preparatory for installation .47
ISO 11295:2017(E)
9.2.1 General.47
9.2.2 Location of existing pipeline system .47
9.2.3 Dimensions of existing pipeline system .48
9.2.4 Provision for maintenance of pipeline service .48
9.2.5 Preparation of existing pipeline .48
Bibliography .49
iv © ISO 2017 – All rights reserved

ISO 11295:2017(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 ISO/TC 138 Plastics pipes, fittings and valves for the transport of fluids,
Subcommittee SC 8, Rehabilitation of pipeline systems.
This second edition cancels and replaces the first edition (ISO 11295:2010), which has been technically
revised.
This edition includes the following significant changes with respect to the previous edition:
— Clauses 3, 4, 5 and 6 have been technically revised;
— Clause 7 for the classification of replacement techniques has been added.
ISO 11295:2017(E)
Introduction
This document classifies the techniques used for the renovation and trenchless replacement of existing
pipelines and gives information on the design and application of plastics piping systems used for such
rehabilitation.
In recent years, the rehabilitation of pipeline systems has become increasingly important and will
continue to be so.
Pipeline systems are continuously required to satisfy physical, chemical, biochemical and biological
demands. These demands depend on planning, material, construction, type and period of use.
When pipeline systems become operational, proper system management has to be put in place. In
addition to inspection and cleaning, rehabilitation of the pipeline can be required. Rehabilitation
is carried out when there is a need to restore or upgrade the performance of a pipeline system.
Rehabilitation can consist of repair, renovation or replacement.
To coincide with the publication of ISO rehabilitation product standards for various application areas
using methods other than renovation, the need to extend the scope of this document to include families
of trenchless replacement techniques was recognized.
vi © ISO 2017 – All rights reserved

INTERNATIONAL STANDARD ISO 11295:2017(E)
Classification and information on design and applications
of plastics piping systems used for renovation and
replacement
1 Scope
This document defines and describes families of techniques for the renovation and trenchless
replacement (on or off the line of an existing pipeline) of non-pressure and pressure pipelines through
the use of plastics pipes, including plastics composites formed in situ into pipes, fittings and ancillary
components. It does not include new construction provided as network extension. For each technique
family, it identifies areas of application including, but not limited to, underground drainage and
sewerage, and underground water and gas supply networks.
This document provides information on the principles of, but not the detailed methodologies for, the
design of plastics piping systems used for renovation or trenchless replacement of existing pipelines,
covering:
— existing pipeline and site conditions;
— functions of the new pipeline;
— structural performance;
— hydraulic performance;
— installation aspects and site impact;
— other factors affecting renovation or trenchless replacement technique selection.
Necessary work on the existing pipeline prior to renovation and/or trenchless replacement is outside
the scope of this document.
This document provides information needed to determine viable options and for identification of the
optimal technique with regard to a given set of rehabilitation objectives.
NOTE It is the responsibility of the designer to choose and design the renovation or trenchless
replacement system.
It does not specify the calculation methods to determine, for each viable technique, the required amount
of lining or replacement pipe material needed to secure the desired performance of the rehabilitated
pipeline.
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 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special
characteristics
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1043-1 and the following apply.
ISO 11295:2017(E)
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
3.1.1
rehabilitation
measures for restoring or upgrading the performance of existing pipeline systems, including renovation
(3.1.2), repair (3.1.3) and replacement (3.1.4)
3.1.2
renovation
work incorporating all or part of the original fabric of the pipeline, by means of which its current
performance is improved
3.1.3
repair
rectification of local damage
3.1.4
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
3.1.5
network extension
new construction off the line of a pipeline or a network with the aim to expand the total capacity of
the network
3.1.6
trenchless replacement
replacement (3.1.4) without opening trenches other than small excavations to provide access for the
particular technique
3.1.7
maintenance
routine work undertaken to ensure the continuing performance of an asset
3.1.8
independent pressure pipe liner
liner (3.2.3) capable on its own of resisting without failure all applicable internal loads throughout its
design life
3.1.9
interactive pressure pipe liner
liner (3.2.3) which relies on the existing pipeline for radial support in order to resist without failure all
applicable internal loads throughout its design life
3.1.10
fully structural renovation
use of an independent pressure pipe liner (3.1.8) which is capable of resisting all external loads
irrespective of the condition of the existing pipeline
3.1.11
semi-structural renovation
use of an interactive pressure pipe liner (3.1.9) which is capable of long-term hole and gap spanning at
operational pressure
2 © ISO 2017 – All rights reserved

ISO 11295:2017(E)
3.1.12
flow diversion
temporary isolation of the section of pipeline to be rehabilitated by the use of a temporary bypass or
other means
3.2 Techniques
3.2.1
technique family
grouping of renovation (3.1.2) or trenchless replacement (3.1.6) techniques which are considered to have
common characteristics for standardization purposes
3.2.2
lining pipe
pipe inserted for renovation (3.1.2) purposes
3.2.3
liner
lining pipe (3.2.2) after installation
3.2.4
lining system
lining pipe (3.2.2) and all relevant fittings inserted into an existing pipeline for the purposes of
renovation (3.1.2)
3.2.5
lining with continuous pipes
lining with pipe made continuous prior to insertion, where the diameter of the lining pipe (3.2.2)
remains unchanged
3.2.6
lining with close-fit pipes
lining with a continuous pipe (3.2.5) for which the cross-section is reduced to facilitate installation and
reverted after installation to provide a close fit to the existing pipe
3.2.7
lining with cured-in-place pipes
lining with a flexible tube impregnated with a thermosetting resin, which produces a pipe after resin cure
3.2.8
lining with discrete pipes
lining with short lengths of pipe which are jointed to form a continuous pipe one by one during insertion
3.2.9
lining with adhesive-backed hoses
lining with a reinforced hose which relies on an adhesive bond to the host pipe to provide resistance to
collapse
3.2.10
lining with spirally-wound pipes
lining with a profiled strip, spirally wound to form a continuous pipe after installation
3.2.11
lining with sprayed polymeric materials
lining with a sprayed two-part polymeric resin material that forms a continuous pipe after resin cure
3.2.12
lining with inserted hoses
lining with a reinforced hose which is either permanently shaped or re-rounded after installation by
the application of an internal pressure
ISO 11295:2017(E)
3.2.13
lining with a rigidly anchored plastics inner layer
lining with a single rigid annulus of structural cementitious grout formed between a plastics layer and
the host pipe, where the plastics layer is permanently anchored in the grout
3.2.14
lining with pipe segments
lining with prefabricated segments bonded to the existing pipe, which either have longitudinal joints
and cover the whole of the pipe circumference, or cover only part of circumference
3.2.15
pipe bursting
on-the-line replacement (3.1.4) 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
3.2.16
pipe removal
on-the-line replacement (3.1.4) method, in which the existing pipe is removed by pipe eating (3.2.17) or
pipe extraction (3.2.18) and a new pipe is installed
3.2.17
pipe eating
type of pipe removal (3.2.16), where the existing pipe is progressively broken up and removed along
with an annulus of the ground immediately surrounding the existing pipe
3.2.18
pipe extraction
type of pipe removal (3.2.16), where the existing pipe is extracted by pulling or pushing and replaced
with a new one, either simultaneously or as a separate step
3.2.19
horizontal directional drilling
off-the-line replacement (3.1.4) method in which a pilot bore is drilled using a steerable drilling head
connected to flexible rods and then the bore is enlarged by reamers up to the diameter required for the
pipe or pipes subsequently pulled/pushed into place
3.2.20
impact moling
off-the-line replacement (3.1.4) method in which pipes are pulled in behind a pneumatic powered soil
displacement hammer
3.2.21
pipe jacking
off-the-line replacement (3.1.4) method in which pipes are pushed through the ground, and the soil
inside removed either manually, mechanically or using a slurry system
3.2.22
auger boring
type of pipe jacking (3.2.21), where the bore is excavated by a rotating cutting head attached to an
auger which continuously removes the spoil, and the pipeline is pushed independently from the auger
3.2.23
microtunnelling
type of pipe jacking (3.2.21) where pipes are pushed behind a steerable, small scale tunnelling machine,
remotely controlled from the surface
4 © ISO 2017 – All rights reserved

ISO 11295:2017(E)
3.2.24
grout system
cement-based grout including any fillers, reinforcement or other additives or admixtures, in specified
proportions
3.3 Service conditions
3.3.1
nominal pressure
PN
numerical designation used for reference purposes related to the mechanical characteristics of the
component of a piping system
Note 1 to entry: For plastics piping systems conveying water, it corresponds to the maximum continuous
5 2
operating pressure, expressed in bar (1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm ), which can be sustained with
water at 20 °C, based on the minimum design coefficient.
3.3.2
internal pressure resistance
ability to withstand internal hydrostatic pressurization
3.3.3
allowable operating pressure
PFA
maximum hydrostatic pressure that a component is capable of withstanding continuously in service
4 Abbreviated terms
For the purposes of this document, the abbreviated terms given in ISO 1043-1 and the following apply.
CCTV closed circuit television
HDD horizontal directional drilling
EP epoxy resin
GRP glass-reinforced thermosetting plastics
PE polyethylene
PP polypropylene
PRC polyester resin concrete
PUR polyurethane
PVC-U unplasticized poly(vinyl chloride)
UP unsaturated polyester resin
VE vinyl ester resin
ISO 11295:2017(E)
5 Classification of renovation and replacement techniques
Renovation and replacement techniques within the scope of this document are classified in Figure 1.

a
Outside the scope of this document.
Figure 1 — Renovation and trenchless replacement technique families using plastics pipes
defined in the overall context of rehabilitation of pipeline systems
6 © ISO 2017 – All rights reserved

ISO 11295:2017(E)
6 Classification of renovation techniques
6.1 General
Renovation technique families using plastics pipes are classified in accordance with Figure 1.
Techniques used for the renovation of continuous lengths of existing pipeline usually between two or
more access points shall be classified in accordance with 6.2 to 6.11, where the different renovation
technique families are defined and their respective features including materials, application, as well as
geometric performance and installation characteristics are described.
NOTE 1 The pipe materials listed in 6.2 to 6.11 reflect the state-of-the-art in the technique families on the
date of publication of this document. Not all technique families/material-combinations are covered by a product
standard. The Bibliography gives relevant available documents.
NOTE 2 The application areas covered by existing product standards include underground drainage and
sewerage and underground water and gas supply networks.
NOTE 3 The maximum and minimum sizes and lengths listed for technique families are those typical at the
time of publication of this document.
6.2 Lining with continuous pipes
Lining is carried out with pipes made continuous prior to insertion, where the diameter of the lining
pipe remains unchanged (see Figure 2 and Table 1).
NOTE This is often referred to as slip-lining.
Key
1 pulling head
2 lining pipe
3 prior jointing of lining pipe
4 existing pipe
Figure 2 — Lining with continuous pipes
ISO 11295:2017(E)
Table 1 — Features of lining with continuous pipes
Feature Description
Relevant ISO 11296-2, ISO 11297-2, ISO 11298-2, ISO 11299-2
documents:
Materials: PE
Applications: —  non-pressure pipes;
—  pressure pipes.
Geometric —  minimum size:   100 mm;
characteristics:
—  maximum size:  1 200 mm;
—  maximum length:   750 m;
—  capable of accommodating slightly curved alignments of the existing pipe.
Performance: —  significant reduction in hydraulic (volumetric and flow) capacity;
—  invert grade of liner can deviate from that of existing pipeline;
—  structural rehabilitation is possible;
—  abrasion resistance depends on liner material;
—  chemical resistance depends on liner material.
Installation a)  pipes manufactured or prior assembled into the continuous length required;
characteristics:
b)  insertion possible by pushing and/or pulling;
c)  surface working space: storage of the whole insertion length required on surface:
1)  small diameters (typically ≤180 mm) can be supplied on coils, small space;
2)  larger diameters: supplied in straight lengths;
d)  access to the existing pipeline: generally requires local excavation;
e)  technique does not rely on adhesion to host pipe;
f)  flow diversion is typically required for installation;
g)  the annular space can be grouted, e.g. in non-pressure applications, to fix line
and level and/or prevent subsequent movement;
h)  live insertion is possible (but excl. drinking water applications for hygiene
reasons);
i)  reconnection of laterals: generally requires excavation.
Installation —  rollers to support the entire length of the lining pipe string (except where pipe
equipment:    is inserted directly from a coil);
—  pushing unit, if applicable;
—  rollers to guide the lining pipe into the existing pipeline;
—  winch or rod puller to pull the lining pipe through the existing pipeline;
—  jointing equipment appropriate to the material;
—  grouting equipment, if applicable.
Surface area: —  for the lining pipe string (or coil trailer for smaller diameters) at the insertion end;
—  for a winch or a rod puller at the receiving end.
Excavation: —  at the insertion end:
—  long enough to allow the lining pipe to enter the existing pipeline,
taking account of the permissible minimum bending radius;
—  wide enough for the guidance equipment and pushing equipment if applicable;
—  at the receiving end:
—  large enough to accommodate the lining pipe nose cone and the winch mast or
rod puller, where applicable.
8 © ISO 2017 – All rights reserved

ISO 11295:2017(E)
6.3 Lining with close-fit pipes
Lining is carried out with a continuous pipe for which the external dimension is reduced to facilitate
installation and reverted after installation to provide a close fit to the existing pipe.
Methods of lining with close-fit pipes are shown in Figure 3 (Method A), Figure 4 (Method B) and
Table 2.
a) Method A: reduction in the pipe manufacturing plant — the pipe is supplied coiled on a reel from
which it is directly inserted.
b) Method B: reduction on site — the pipe is fed through diameter reduction or folding equipment and
inserted.
Key
1 drum trailer 4 pulling head 7 guide pulley
2 pipe guide 5 winch cable 8 bracing
3 lining pipe (folded) 6 winch
NOTE Pipe reverted (unfolded) after insertion by application of heat and/or pressure.
Figure 3 — Lining with close-fit pipes — Schematic representation of installation of a pipe
reduced in external dimension in the pipe manufacturing plant (Method A)
ISO 11295:2017(E)
Key
1 pulling head 5 winch or rod pulling device
2 initial lining pipe 6 guide pulley
3 reduced lining pipe 7 bracing cage
4 device for reducing
NOTE Pipe reverted (expanded or unfolded as applicable) after insertion by release of pulling force or
application of pressure.
Figure 4 — Lining with close-fit pipes — Schematic representation of installation of a pipe
reduced in external dimension on site (Method B)
Table 2 — Features of lining with close-fit pipes
Feature Description
Relevant ISO 11296-3, ISO 11297-3, ISO 11298-3, ISO 11299-3
documents:
Materials: PE and PVC-U
Applications: —  non-pressure pipes;
—  pressure pipes.
Geometric —  some deviation from nominally circular shape possible;
characteristics:
—  minimum size: 100 mm for both Method A and Method B;
—  maximum size: 500 mm for Method A, 1 500 mm for Method B;
—  maximum length: 500 m;
—  some techniques can accommodate bends.
Performance: —  minimal reduction in volumetric capacity; increase in flow due to reduced friction
possible;
—  gradient cannot be restored;
—  structural rehabilitation is possible;
—  abrasion resistance depends on liner material;
—  chemical resistance depends on liner material.
a
Where reducing is carried out simultaneously with insertion, winching forces can be high, necessitating substantial
anchoring of winch and reducing equipment.
10 © ISO 2017 – All rights reserved

ISO 11295:2017(E)
Table 2 (continued)
Feature Description
Installation a)  lining pipe first reduced in size by mechanical or thermo-mechanical means
characteristics:    (in the manufacturing plant or on site), inserted (in the case of PVC-U pre-heating
generally required) and then reverted by relief of installation forces or application
of heat and/or pressure;
b)  surface working space: no particular constraint for Method A, storage of the whole
insertion length can be required on surface for Method B (depends on specific
technique);
c)  access: typically through manhole for Method A, requires local excavation for Method B;
d)  technique does not rely on adhesion to host pipe;
e)  flow diversion is required;
f)  grouting not applicable;
g)  reconnection of laterals:
1)  gravity pipelines: possible from inside (re-opening and tight connection);
2)  in pressure applications: generally requires excavation.
Installation —  rollers to support the entire length of the lining pipe string (except where pipe is
equipment:    inserted directly from a coil);
—  guide for entrance of the lining pipe into the existing pipeline;
a
—  winch to pull the lining pipe through the existing pipeline ;
—  pushing unit, if applicable;
—  a compressor and a steam generator (where applicable), or hydraulic pressurisation
pump according to particular technique, for lining pipe reversion;
—  jointing equipment appropriate to material.
Surface area: —  for the lining pipe string (or coil trailer for smaller diameters and/or folded pipe)
at the insertion end;
—  for reducing or folding equipment at the insertion end where reduction or folding
is carried out simultaneously with insertion;
—  for a winch at the receiving end;
—  for reversion equipment.
Excavation: —  for Method A, not necessary for sewer applications, where access through existing
manholes is sufficient due to flexibility of the lining pipe; in other applications,
only small excavations at both ends;
—  for Method B, at the insertion end: long enough to allow the lining pipe to enter the
existing pipeline, taking account of the permissible minimum bending radius;
wide enough for the guidance equipment and pushing equipment, if applicable;
—  at the receiving end: large enough to accommodate the lining pipe nose cone
and longitudinal retraction during reversion of the lining pipe, if applicable.
a
Where reducing is carried out simultaneously with insertion, winching forces can be high, necessitating substantial
anchoring of winch and reducing equipment.
6.4 Lining with cured-in-place pipes
Lining is carried out with a flexible tube impregnated with a thermosetting resin, which produces a
pipe after resin cure [see Figure 5 (Method A), Figure 6 (Method B) and Table 3].
ISO 11295:2017(E)
Key
1 impregnated lining pipe 4 inversion face
2 applied water head for inversion 5 scaffold tower
3 water reservoir 6 clamping flange or ring
NOTE 1 The equipment used to cure resin on completion of inversion (e.g. by heating water or injecting steam)
is not shown.
NOTE 2 Other methods, including inversion with air from a pressure vessel, are possible.
Figure 5 — Lining with cured-in-place pipes — Schematic representation of installation by
inversion (Method A), showing use of scaffold tower and water
Key
1 impregnated lining pipe
2 winch
Figure 6 — Lining with cured-in-place pipes — Schematic representation of installation by
winching and subsequent inflation (Method B)
12 © ISO 2017 – All rights reserved

ISO 11295:2017(E)
Table 3 — Features of lining with cured-in-place pipes
Feature Description
Relevant ISO 11296-4, ISO 11297-4
documents:
Materials: A composite consisting of a reinforced or unreinforced fabric carrier material impregnated
with thermosetting resin (UP, EP or VE), which can include optional internal and/or
external membranes. For details, see the relevant International Standard.
Applications: —  non-pressure pipes;
—  pressure pipes.
Geometric —  circular and non-circular cross-section;
characteristics:
—  minimum size:   100 mm;
—  maximum size: 2 800 mm;
—  maximum length: Method A: 600 m, Method B: 300 m;
—  bends can be accommodated;
—  change of dimensions can be accommodated.
Performance: —  minimal reduction in volumetric capacity; increase in flow due to reduced friction
possible;
—  restoring of invert is not possible;
—  structural rehabilitation is possible;
—  abrasion resistance depends on wall structure;
—  chemical resistance mainly depends on resin type.
Installation a)  insertion of the impregnated lining pipe, prior to curing, can be achieved by:
characteristics:
1)  inverting into position with pressure only (water or air) or
2)  winching into place and then inflating;
3)  combinations of Methods A and B are also possible;
b)  curing process can be initiated or accelerated by either:
1)  heat (hot water, steam);
2)  UV radiation;
3)  ambient temperature;
c)  surface working space: generally minimal, varies with technique;
d)  access: entry through existing manhole or small excavation possible;
e)  structural effect does not rely on adhesion to host pipe;
f)  flow diversion required;
g)  re-opening of laterals from inside is possible;
h)  reconnection of laterals:
1)  gravity pipelines: possible from inside (re-opening and tight connection);
2)  in pre
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