SIST EN ISO 11300-2:2026

SLOVENSKI STANDARD
01-december-2026
Cevni sistemi za obnovo podzemnih odtokov, kanalizacije in vodovodnih omrežij -
2. del: Duromerni kompozitni materiali (ISO 11300-2:2026)
Piping systems for rehabilitation of underground drains, sewers and water supply
networks - Part 2: Thermoset composite materials (ISO 11300-2:2026)
Rohrleitungssysteme für die Sanierung von unterirdischen Entwässerungs-,
Kanalisations- und Wasserversorgungsnetzen - Teil 2: Duroplastische Komposite (ISO
11300-2:2026)
Systèmes de canalisations pour la réhabilitation des branchements, des collecteurs
d’assainissement et des réseaux d’alimentation en eau enterrés - Partie 2: Matériaux
composites thermodurcissables (ISO 11300-2:2026)
Ta slovenski standard je istoveten z: EN ISO 11300-2:2026
ICS:
23.040.05 Cevovodi za zunanje Pipeline and its parts for
sisteme za odpadno vodo in external sewage systems
njihovi deli
91.140.80 Drenažni sistemi Drainage systems
93.025 Zunanji sistemi za prevajanje External water conveyance
vode systems
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 11300-2
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2026
EUROPÄISCHE NORM
ICS 91.140.80; 93.025; 93.030; 23.040.05 Supersedes EN ISO 11296-1:2018, EN ISO 11296-
4:2018, EN ISO 11297-1:2018, EN ISO 11297-4:2018,
EN ISO 11298-1:2018, EN ISO 11298-4:2021, EN ISO
11296-4:2018/A1:2021
English Version
Piping systems for rehabilitation of underground drains,
sewers and water supply networks - Part 2: Thermoset
composite materials (ISO 11300-2:2026)
Systèmes de canalisations pour la réhabilitation des Rohrleitungssysteme für die Sanierung von
branchements, des collecteurs d'assainissement et des unterirdischen Entwässerungs-, Kanalisations- und
réseaux d'alimentation en eau enterrés - Partie 2: Wasserversorgungsnetzen - Teil 2: Duroplastische
Matériaux composites thermodurcissables (ISO 11300- Komposite (ISO 11300-2:2026)
2:2026)
This European Standard was approved by CEN on 9 October 2026.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATIO N

EUROPÄISCHES KOMITEE FÜR NORMUN G

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11300-2:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 11300-2:2026) 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 April 2027, and conflicting national standards shall be
withdrawn at the latest by April 2027.
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 11297-4:2018, EN ISO 11296-1:2018, EN ISO 11296-4:2018,
EN ISO 11297-1:2018, EN ISO 11298-1:2018, EN ISO 11298-4:2021 and EN ISO 11296-4:2018/A1:2021
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 11300-2:2026 has been approved by CEN as EN ISO 11300-2:2026 without any
modification.
International
Standard
ISO 11300-2
First edition
Piping systems for rehabilitation
2026-10
of underground drains, sewers and
water supply networks —
Part 2:
Thermoset composite materials
Systèmes de canalisations pour la réhabilitation des
branchements, des collecteurs d’assainissement et des réseaux
d’alimentation en eau enterrés —
Partie 2: Matériaux composites thermodurcissables
Reference number
ISO 11300-2:2026(en) © ISO 2026

ISO 11300-2:2026(en)
© ISO 2026
All rights reserved.
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Published in Switzerland
ii
ISO 11300-2:2026(en)
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 General terms .3
3.2 Terms related to techniques .3
3.3 Terms related to characteristics.5
3.4 Terms related to product stages .7
3.5 Terms related to materials .8
3.6 Terms related to service conditions .9
4 Symbols and abbreviated terms. 9
4.1 Symbols .9
4.2 Abbreviated terms . 12
5 Pipes .12
5.1 Materials . 12
5.2 General characteristics .14
5.3 Material characteristics . 15
5.3.1 Resin system . 15
5.3.2 Special requirements for formulation of components in contact with drinking
water . 15
5.4 Geometric characteristics . 15
5.4.1 General . 15
5.4.2 Wall thickness at the “M” stage .16
5.4.3 Wall thickness at the “I” stage .16
5.4.4 CIPP wall structure at the “I” stage .16
5.5 Mechanical characteristics .17
5.5.1 General .17
5.5.2 Reference conditions for testing .17
5.5.3 Test requirements .17
5.6 Physical characteristics .21
5.7 Additional characteristics .21
5.8 Sampling . 22
5.8.1 General . 22
5.8.2 Non-pressure drains and sewers . 22
5.9 Jointing. 23
5.10 Marking . 23
6 Fittings .23
6.1 General . 23
6.2 General characteristics .24
6.3 Material characteristics .24
6.4 Geometric characteristics .24
6.5 Mechanical characteristics . 25
6.6 Physical characteristics . 25
6.7 Jointing. 26
6.8 Marking . 26
7 Ancillary components .26
8 Fitness for purpose .26
8.1 Materials . 26
8.2 General characteristics .27
8.3 Geometric characteristics .27
8.4 Mechanical characteristics . 28

iii
ISO 11300-2:2026(en)
8.5 Additional characteristics . 28
8.6 Sampling . 29
8.7 Regional requirements for the CIPP lining system . 29
9 Installation practice .29
9.1 Preparatory work . 29
9.2 Storage, handling and transport of lining tube components. 29
9.3 Equipment . 29
9.3.1 General . 29
9.3.2 Technique-specific equipment . 29
9.4 Installation . 30
9.4.1 General . 30
9.4.2 Environmental precautions .31
9.4.3 Safety precautions .31
9.4.4 Installation procedures .31
9.4.5 Simulated installations .32
9.5 Process-related inspection and testing .32
9.6 Lining process termination .32
9.7 Reconnection to the existing pipeline system .32
9.7.1 General .32
9.7.2 Non-pressure networks . 33
9.7.3 Pressure networks . 33
9.8 Final inspection and testing . 33
9.9 Documentation . 33
Annex A (informative) CIPP liner components and their functions .34
Annex B (normative) Cured-in-place pipes — Determination of short-term flexural properties .35
Annex C (normative) Cured-in-place pipes — Determination of long-term flexural modulus
under dry or wet conditions .46
Annex D (normative) Cured-in-place pipes — Determination of long-term flexural strength
under dry, wet or acidic conditions (stress corrosion test) .50
Annex E (informative) Summary of required elements to be included in installation manuals .54
Bibliography .56

iv
ISO 11300-2:2026(en)
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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of 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 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, in collaboration with the European
Committee for Standardization (CEN) Technical Committee CEN/TC 155, Plastics piping systems and
ducting systems, in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna
Agreement).
This first edition of ISO 11300-2, along with ISO 11300-1:2026, ISO 11300-3:2026 and ISO/DIS 11300-4,
cancels and replaces ISO 11296-1:2018, ISO 11296-4:2018, ISO 11296-4:2018/Amd 1:2021, ISO 11297-1:2018,
ISO 11297-4:2018, ISO 11298-1:2018 and ISO 11298-4:2021, which have been technically revised.
The main changes are as follows:
— for piping systems made from thermoset composite materials, this document replaces the related
content, including requirements, of the documents listed above;
— definitions in Clause 3 have been amended and new definitions have been added;
— a new material classification of thermoplastics membranes has been added (see Table 1);
— the material classification of resin systems has been expanded (see Table 2);
— additional requirements for declaration of short-term mechanical characteristics have been included
(see Table 5);
— the classification of lateral connections has been extended (new class D connection added in Table 8 and
Figure 6);
— in Annex B all references to ISO 178 have been removed and replaced by references to ISO 14125 only;
— in B.5.4, the procedure for determining apparent flexural modulus of curved samples has been amended
and the formula for associated curvature correction factor modified to take account of large, geometry-
changing deformations of the test pieces and friction at the supports. The previous curvature correction
factor for stress has been deleted;

v
ISO 11300-2:2026(en)
— in B.5.5, the correction for curvature of the apparent section bending modulus has been similarly
updated.
A list of all parts in the ISO 11300 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

vi
ISO 11300-2:2026(en)
Introduction
This document is a part of a series of International Standards concerning piping systems of various
materials used for the rehabilitation of existing pipelines in a specified application area. System Standards
for rehabilitation deal with the following applications:
— ISO 11300 series: Piping systems for rehabilitation of underground drains, sewers and water supply networks;
— ISO 11301 series: Piping systems for rehabilitation of underground gas supply networks.
The ISO 11300 and ISO 11301 series are subdivided into parts each covering a specific material or class of
material of the piping system.
ISO 11300 series is subdivided into four parts:
— Part 1: Polyethylene (PE) material;
— Part 2: Thermoset composite materials (this document);
— Part 3: PVC-U material;
— Part 4: Thermoplastic composite materials.
These documents cover various techniques for renovation and trenchless replacement. Furthermore, they
are distinguished from those for conventionally installed plastics piping systems by the requirement to
verify certain characteristics in the “as-installed condition”, after site processing. This is in addition to
specifying requirements for piping system components “as manufactured”.
A consistent structure of clause headings has been adopted for all parts of the ISO 11300 series and the
ISO 11301 series, in order to facilitate direct comparisons across rehabilitation technique families.
Figure 1 shows the clause structure and the relationship between the ISO 11300 series and the ISO 11301
series.
For complementary information, see ISO 11295.
For assessment of conformity to the requirements of this document, see ISO/TS 23818-2.

vii
ISO 11300-2:2026(en)
a
In preparation.
Figure 1 — Clause structure of the ISO 11300 series and the ISO 11301 series
The various techniques for rehabilitation of underground drains and sewers and water supply networks,
within the scope of pipeline rehabilitation techniques generally, are shown schematically in Figure 2. For
definitions of standardized renovation and replacement techniques shown in Figure 2, but outside the scope
of this document, see ISO 11295.

viii
ISO 11300-2:2026(en)
a
This document is applicable, for piping systems made from thermoset composite materials.
Figure 2 — Technique families for renovation of underground drains, sewers and water supply
networks using plastics pipes, within the scope of pipeline rehabilitation techniques

ix
International Standard ISO 11300-2:2026(en)
Piping systems for rehabilitation of underground drains,
sewers and water supply networks —
Part 2:
Thermoset composite materials
1 Scope
This document specifies requirements and test methods for pipes and fittings which are part of piping
systems for the rehabilitation of underground non-pressure and pressure drains and sewers, and of water
supply networks which transport water intended for human consumption, including raw water intake
pipelines.
This document is applicable to the renovation technique family "lining with cured-in-place pipes (CIPP)". It is
not applicable to lining with discrete pipes or lining with pipe segments using glass-reinforced thermosetting
plastics (GRP) material, as defined by ISO 11295.
It is not applicable to short lengths of CIPP used for patch repair only of local pipe defects.
It applies to the use of thermoset composite materials with various thermosetting resin systems, in
combination with compatible fibrous carrier materials, reinforcement, and thermoplastics membranes (see
5.1).
It is applicable to pipes and fittings, as manufactured, as well as to the installed system. It applies for service
temperatures up to 50 °C for drains and sewers and up to 25 °C for water supply networks.
For pressurised networks, this document applies to independent (fully structural, class A) and interactive
(semi structural, class B) pressure pipe liners, as defined in ISO 11295, which do not rely on adhesion to the
existing pipeline.
It does not include requirements or test methods for resistance to abrasion, jetting, cyclic loading or impact,
which 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 75-2:2013, Plastics — Determination of temperature of deflection under load — Part 2: Plastics and ebonite
ISO 899-2:2024, Plastics — Determination of creep behaviour — Part 2: Flexural creep by three-point loading
ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 4435, Plastics piping systems for non-pressure underground drainage and sewerage — Unplasticized
poly(vinyl chloride) (PVC-U)
ISO 4633, Rubber seals — Joint rings for water supply, drainage and sewerage pipelines — Specification for
materials
ISO 7432, Glass-reinforced thermosetting plastics (GRP) pipes and fittings — Test methods to prove the design of
locked socket-and-spigot joints, including double-socket joints, with elastomeric seals

ISO 11300-2:2026(en)
ISO 7509, Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Determination of
time to failure under sustained internal pressure
ISO 7685:2026, Glass-reinforced thermosetting plastics (GRP) pipes — Determination of initial ring stiffness
ISO 8513:2023, Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Test methods
for the determination of the initial longitudinal tensile strength
ISO 8521:2020, Glass-reinforced thermosetting plastic (GRP) pipes — Test methods for the determination of the
initial circumferential tensile wall strength
ISO 8533, Glass-reinforced thermosetting plastics (GRP) pipes and fittings — Test methods to prove the design of
cemented or wrapped joints
ISO 8773, Plastics piping systems for non-pressure underground drainage and sewerage — Polypropylene (PP)
ISO 10468:2023, Glass-reinforced thermosetting plastics (GRP) pipes — Determination of the ring creep
properties under wet or dry conditions
ISO 10928:2024, Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes and fittings —
Methods for regression analysis and their use
ISO 10952, Glass-reinforced thermosetting plastics (GRP) pipes and fittings — Determination of the resistance
to chemical attack for the inside of a section in a deflected condition
ISO 11295:2026, Plastics piping systems used for the rehabilitation of pipelines — Classification and overview of
strategic, tactical and operational activities
ISO 13002, Carbon fibre — Designation system for filament yarns
ISO 14125:1998, Fibre-reinforced plastic composites — Determination of flexural properties
ISO 23856:2021, Plastics piping systems for pressure and non-pressure water supply, drainage or sewerage —
Glass-reinforced thermosetting plastics (GRP) systems based on unsaturated polyester (UP) resin
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 1610:2015, Construction and testing of drains and sewers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 11295 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/

ISO 11300-2:2026(en)
3.1 General terms
3.1.1
characteristic
property, dimension or other feature of a material or component
[SOURCE: ISO 11300-1:2026, 3.1.1]
3.1.2
declared value
limiting value of a characteristic (3.1.1) declared in advance by the rehabilitation system supplier (3.1.3)
supplier, which becomes the requirement for the purposes of assessment of conformity
[SOURCE: ISO 11300-1:2026, 3.1.2]
3.1.3
rehabilitation system supplier
entity that specifies the field and range of application and brings together the components of a rehabilitation
system to meet the requirements of the product standard at the “M” stage (3.4.1), so that when installed in
accordance with the installation manual they meet the requirements of the product standard at the “I” stage
(3.4.2)
[SOURCE: ISO 11300-1:2026, 3.1.5]
3.1.4
system installer
entity that prepares the host pipe, takes the rehabilitation system at the “M” stage (3.4.1) and installs it so
that it is at the “I” stage (3.4.2)
[SOURCE: ISO 11300-1:2026, 3.1.6]
3.1.5
type testing
testing performed to prove that a material, component, joint or assembly is capable of conforming to the
requirements given in the applicable standard
[SOURCE: ISO 11300-1:2026, 3.1.7]
3.2 Terms related to techniques
3.2.1
inversion
process of turning a flexible tube or hose inside out by the use of fluid (water or air) pressure
3.2.2
inverted-in-place insertion
method whereby the lining tube (3.2.11) is installed by inversion (3.2.1) to achieve simultaneous insertion
and inflation
3.2.3
inflation
process of expanding a lining tube (3.2.11) to achieve a close fit (3.2.5) to the existing pipeline by the use of
fluid (water or air) pressure
3.2.4
winched-in-place insertion
method whereby the flat lining tube (3.2.11) is first pulled into the pipe to be lined and then inflated to bring
it up to size
Note 1 to entry: With some techniques, inflation (3.2.3) is achieved by inversion (3.2.1) through the pulled-in lining
tube (3.2.11) of a separate impregnated tube or dry tube or hose. Hoses can either be withdrawn after resin cure or
left in place as a permanent or semi-permanent internal membrane.

ISO 11300-2:2026(en)
3.2.5
close fit
situation of the outside of the installed liner relative to the inside of the existing pipeline, which may either
be an interference fit or include a small annular gap resulting from shrinkage and tolerances only
[SOURCE: ISO 11300-1:2026, 3.2.1]
3.2.6
CIPP liner
cured-in-place pipe liner
lining tube (3.2.11) after installation and resin cure
3.2.7
CIPP lining system
lining tube (3.2.11) and all relevant fittings for insertion into an existing pipeline for the purposes of
renovation
3.2.8
CIPP product
cured-in-place pipe product
cured-in-place pipe liner (3.2.6) of a particular design, produced from a lining tube (3.2.11) of specified
materials, with a wall structure which is uniquely defined for each diameter/wall thickness combination,
and which is impregnated with a specific resin system (3.5.6) and installed by a specific process
3.2.9
composite design thickness
e
c,d
required wall thickness of the composite (3.5.3), excluding any abrasion layer (3.5.1), as determined by
structural design
Note 1 to entry: in practice for multi-layer composites e can be calculated as the design value of the thickness e
c,d psl
of the primary structural layer (3.5.7), to which the thicknesses of any internal and external resin-rich layers (3.5.8),
excluding any abrasion layer, are then added.
3.2.10
lateral connection collar
fitting for reconnecting a lined main pipe to an existing or renovated lateral pipe
3.2.11
lining tube
flexible tube, consisting of resin system (3.5.6), carrier material (3.5.2) and either reinforcement (3.5.5) or
membranes or both, as combined prior to insertion in the pipe to be lined
3.2.12
permanent membrane
internal or external membrane designed to retain its integrity through the processes of transportation
and storage, lining tube (3.2.11) insertion and resin system (3.5.6) cure, and to provide functions for the
operational life of the cured-in-place pipe liner (3.2.6)
3.2.13
semi-permanent membrane
internal or external membrane designed to provide protection during transportation and storage and to
remain functional through the processes of lining tube (3.2.11) insertion and resin system (3.5.6) cure, but
not relied on to retain its integrity at the “I” stage
3.2.14
temporary membrane
membrane forming the internal or external surface of the lining tube (3.2.11) for the purposes of protection
during transportation and storage and with process-related functions only during installation
Note 1 to entry: Internal temporary membranes are removed during or after the installation.

ISO 11300-2:2026(en)
3.2.15
preliner
permanent or semi-permanent external membrane which is installed separately before the insertion of the
lining tube (3.2.11)
3.2.16
nominal CIPP “M” stage wall thickness
nominal cured-in-place pipe “M” stage wall thickness
e
n,M
one of a range of discrete wall thicknesses of the dry fibre components of the lining tube (3.2.11) dictated
by the sum of the thicknesses of the individual layers of carrier material (3.5.2) and reinforcement (3.5.5)
used for tube construction at the “M” stage, prior to their impregnation with the resin system (3.5.6) and
excluding any internal or external membranes
Note 1 to entry: Applicable only where dry tube manufacture and resin impregnation undertaken as separate
processes.
3.2.17
nominal CIPP “I” stage wall thickness
nominal cured-in-place pipe “I” stage wall thickness
e
n,I
one of a range of discrete CIPP liner (3.2.6) wall thicknesses at the “I” stage, dictated by the sum of the
thicknesses of the individual layers of materials used for lining tube (3.2.11) construction, excluding any
internal or external membranes
3.3 Terms related to characteristics
3.3.1
nominal outside diameter
d
n
outside diameter of cured-in-place pipe liner (3.2.6) specified as the inside diameter of the pipe to be lined
3.3.2
mean diameter
d
m
diameter of the circle corresponding to the middle of the pipe wall cross-section
Note 1 to entry: In the case of a cured-in-place pipe liner (3.2.6), measured to mid-thickness of the composite (3.5.3)
[SOURCE: ISO 23856:2021, 3.3 — modified]
3.3.3
wall thickness
e
value of the measurement of the wall thickness at any point around the circumference of a component
[SOURCE: ISO 11300-1:2026, 3.3.6]
3.3.4
mean wall thickness
e
m
arithmetic mean of a number of measurements of the wall thickness regularly spaced around the
circumference and in the same cross-section of a component, including the measured minimum and the
measured maximum values of the wall thickness in that cross-section
[SOURCE: ISO 11300-1:2026, 3.3.7]
...