FprEN ISO 11300-2

SLOVENSKI STANDARD
oSIST prEN ISO 11300-2:2025
01-marec-2025
Cevni sistemi za obnovo podzemnih odtokov, kanalizacije in vodovodnih omrežij -
2. del: Duromerni kompozitni materiali (ISO/DIS 11300-2:2025)
Piping systems for rehabilitation of underground drains, sewers and water supply
networks-Part 2: Thermoset composite materials (ISO/DIS 11300-2:2025)
Rohrleitungssysteme für die Sanierung von unterirdischen Entwässerungs-,
Kanalisations- und Wasserversorgungsnetzen - Teil 2: Duroplastische Komposite
(ISO/DIS 11300-2:2025)
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/DIS 11300-2:2025)
Ta slovenski standard je istoveten z: prEN ISO 11300-2
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
oSIST prEN ISO 11300-2:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 11300-2:2025
oSIST prEN ISO 11300-2:2025
DRAFT
International
Standard
ISO/DIS 11300-2
ISO/TC 138/SC 8
Piping systems for rehabilitation
Secretariat: JISC
of underground drains, sewers and
Voting begins on:
water supply networks —
2025-01-06
Part 2:
Voting terminates on:
2025-03-31
Thermoset composite materials
ICS: 93.025; 91.140.80; 23.040.05; 93.030
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
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NOTIFICATION OF ANY RELEVANT PATENT
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PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 11300-2:2025(en)
oSIST prEN ISO 11300-2:2025
ISO/DIS 11300-2:2025(en)
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
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oSIST prEN ISO 11300-2:2025
ISO/DIS 11300-2:2025(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 .4
3.3 Terms related to characteristics.7
3.4 Terms related to product stages .10
3.5 Terms related to materials .10
3.6 Terms related to service conditions .11
4 Symbols and abbreviated terms.12
4.1 Symbols . 12
4.2 Abbreviated terms .14
5 Pipes . 14
5.1 Materials .14
5.2 General characteristics .17
5.3 Material characteristics .17
5.4 Geometric characteristics .17
5.4.1 General .17
5.4.2 Wall thickness at the “M” stage .18
5.4.3 Wall thickness at the “I” stage .18
5.4.4 CIPP wall structure at the “I” stage .18
5.5 Mechanical characteristics .19
5.5.1 General .19
5.5.2 Reference conditions for testing .19
5.5.3 Test requirements .19
5.6 Physical characteristics . 23
5.7 Additional characteristics . 23
5.8 Sampling .24
5.8.1 General .24
5.8.2 Non-pressure drains and sewers .24
5.9 Jointing. 25
5.10 Marking . 25
6 Fittings .26
6.1 General . 26
6.2 General characteristics . 26
6.3 Material characteristics . 26
6.4 Geometric characteristics . 26
6.5 Mechanical characteristics . 28
6.6 Physical characteristics . 28
6.7 Jointing. 28
6.8 Marking . 28
7 Ancillary components .29
8 Fitness for purpose .29
8.1 Materials . 29
8.2 General characteristics . 29
8.3 Geometric characteristics . 30
8.4 Mechanical characteristics . 30
8.5 Additional characteristics .31
8.6 Sampling .31
8.7 Regional requirements for the lining system .31

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ISO/DIS 11300-2:2025(en)
9 Installation practice .32
9.1 Preparatory work .32
9.2 Storage, handling and transport of lining tube components.32
9.3 Equipment .32
9.3.1 General .32
9.3.2 Technique-specific equipment .32
9.4 Installation . 33
9.4.1 General . 33
9.4.2 Environmental precautions . 33
9.4.3 Safety precautions . 33
9.4.4 Installation procedures . 33
9.4.5 Simulated installations . 34
9.5 Process-related inspection and testing . 34
9.6 Lining process termination . 35
9.7 Reconnection to the existing pipeline system . 35
9.7.1 Non-pressure networks . 35
9.7.2 Pressure networks . 35
9.8 Final inspection and testing . 35
9.9 Documentation . 36
Annex A (informative) CIPP components and their functions .37
Annex B (normative) Cured-in-place pipes — Determination of short-term flexural properties .39
Annex C (normative) Cured-in-place pipes — Determination of long-term flexural modulus
under dry or wet conditions .49
Annex D (normative) Cured-in-place pipes — Determination of long-term flexural strength
under dry, wet or acidic conditions (stress corrosion test) .53
Annex E (informative) Examples of methods for reconnecting laterals to a liner .56
Bibliography .58

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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.
For piping systems made from thermoset composite materials, this document cancels and replaces the
system standards: ISO 11296-1, -4, ISO 11297-1, -4 and ISO 11298-1, -4.
ISO 11300-1 similarly replaces for piping systems using PE material, the content of the standards:
ISO 11296-1, -2, -3, ISO 11297-1, -2, -3, ISO 11298-1, -2, -3 and ISO 21225-1, -2
ISO 11300-3 similarly replaces for piping systems using PVC-U material, the content of the standards:
ISO 11296-1, -3.
ISO 11300-4 similarly replaces for piping systems using thermoplastic composite materials, the content of
the standards: ISO 11296-1, -7, -9.
A list of all parts in the ISO 11300 series can be found on the ISO website.
Once all four parts of ISO 11300 have been published, the above-mentioned replaced standards will be
withdrawn.
In merging their respective contents, this document also adds or makes technical changes to the
requirements of the last editions of ISO 11296-4, ISO 11297-4 and ISO 11298-4 as follows:
— Additional and amended definitions in Clause 3.
— New material classification of thermoplastics membranes (amended Table 1).
— Extended material classification of resin systems (new Table 2).
— Additional requirements for declaration of short-term mechanical characteristics in Table 5.
— Extended classification of lateral connections (new class D collar added in Table 9 and Figure 6).

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ISO/DIS 11300-2:2025(en)
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.

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oSIST prEN ISO 11300-2:2025
ISO/DIS 11300-2:2025(en)
Introduction
This document is a part of a System Standard for 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: Piping systems for rehabilitation of underground drains, sewers and water supply networks;
(this standard)
— ISO 11301: Piping systems for rehabilitation of underground gas supply networks.
The System Standards ISO 11300 and ISO 11301 are subdivided into parts each covering a specific material
or class of material of the piping system.
ISO 11300 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 System Standards 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 ISO 11300 and ISO 11301, in order
to facilitate direct comparisons across rehabilitation technique families.
Figure 1 shows the clause structure and the relationship between ISO 11300 and ISO 11301.
For complementary information, see ISO 11295. For assessment of conformity to the requirements of this
document, see ISO/TS 23818-2.
System Standard ISO 11300 incorporates the relevant content of and replaces the following previous System
Standards for the rehabilitation of existing drainage and sewerage and water supply networks:
— 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 21225 series: Plastics piping systems for the trenchless replacement of underground pipeline
networks.
vii
oSIST prEN ISO 11300-2:2025
ISO/DIS 11300-2:2025(en)
Figure 1 — Format of the rehabilitation system standards

viii
oSIST prEN ISO 11300-2:2025
DRAFT International Standard ISO/DIS 11300-2:2025(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.
It is applicable to the renovation technique family:
— lining with cured-in-place pipes (CIPP).
It applies to the use of thermoset composite materials with various thermosetting resin systems, in
combination with compatible fibrous carrier materials, reinforcement, and both permanent and process-
related thermoplastics membranes (see 5.1).
It is applicable to pipes and fittings, as manufactured, as well as to the installed system, with 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, 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 178:2019, Plastics — Determination of flexural properties
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

oSIST prEN ISO 11300-2:2025
ISO/DIS 11300-2:2025(en)
ISO 7509, Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Determination of
time to failure under sustained internal pressure
ISO 7685:2019, 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/DIS 11295:2024, Plastics piping systems used for the rehabilitation of pipelines — Classification and
overview of strategic, tactical and operational activities
ISO/DIS 11300-1, Piping systems for rehabilitation of underground drains, sewers and water supply networks —
Part 1: Polyethylene (PE) material
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
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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/

oSIST prEN ISO 11300-2:2025
ISO/DIS 11300-2:2025(en)
3.1 General terms
3.1.1
pipeline system
interconnecting pipe network for the conveyance of fluids
3.1.2
drain
conduit which conveys wastewater, surface water or other unwanted liquids, including its connections to
lateral pipes, manhole, gullies and other network components
[SOURCE: ISO 6701-1:2020, 3.3.4.38, modified to include connections as stated]
3.1.3
sewer
pipeline which conveys unwanted liquids, including its connections to lateral pipes, manholes, access
chambers and other network components
[SOURCE: ISO 6701-1:2020, 3.3.4.41, modified to include connections as stated]
3.1.4
rehabilitation
measures for restoring or upgrading the performance of existing pipeline systems (3.1.1), including renovation
(3.1.5), repair (3.1.6) and replacement (3.1.7)
3.1.5
renovation
work incorporating all or part of the original fabric of the pipeline, by means of which its current performance
is improved
3.1.6
repair
rectification of local damage
3.1.7
replacement
construction of a new pipeline, on or off the line of an existing pipeline, where the function of the new pipeline
system (3.1.1) incorporates that of the old
3.1.8
trenchless replacement
replacement (3.1.7) without opening trenches other than small excavations to provide access for the
particular technique
3.1.9
maintenance
routine work undertaken to ensure the existing performance of an asset
3.1.10
lining pipe
pipe inserted for renovation (3.1.5) purposes
3.1.11
liner
lining pipe (3.1.10) after installation
3.1.12
lining system
lining pipe (3.1.10) and all relevant fittings for insertion into an existing pipeline for the purposes of
renovation (3.1.5)
oSIST prEN ISO 11300-2:2025
ISO/DIS 11300-2:2025(en)
3.1.13
characteristic
property, dimension or other feature of a material or component
3.1.14
declared value
limiting value of a characteristic (3.1.13) declared in advance by the lining system (3.1.12) supplier, which
becomes the requirement for the purposes of assessment of conformity
3.1.15
system test pressure
STP
either hydrostatic or air pressure, or both applied to the installed pipeline system in order to ensure its
integrity and leaktightness
3.1.16
simulated installation
installation of a lining system (3.1.12) into a simulated host pipeline (3.1.17), using representative equipment
and processes, to provide samples for testing which are representative of an actual installation
3.1.17
simulated host pipeline
section of pipeline, which is not part of an operational network, but which replicates the environment of an
operational network
3.1.18
technique family
group of renovation techniques which are considered to have common characteristics (3.1.13) for
standardization purposes
3.1.19
independent pressure pipe liner
liner capable on its own of resisting without failure all applicable internal loads throughout its design life
3.1.20
interactive pressure pipe liner
liner which relies on the existing pipeline for some measure of radial support in order to resist without
failure all applicable internal loads throughout its design life
3.1.21
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
3.1.22
CCTV
system comprised of cameras, recorders, interconnections and displays that are used to inspect pipelines
3.2 Terms related to techniques
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.
3.2.1
lining with cured-in-place pipes
lining with a flexible tube impregnated with a thermosetting resin, which produces a pipe after resin cure

oSIST prEN ISO 11300-2:2025
ISO/DIS 11300-2:2025(en)
3.2.2
inversion
process of turning a flexible tube or hose inside out by the use of fluid (water or air) pressure
3.2.3
inverted-in-place insertion
method whereby the lining tube (3.2.15) is introduced by inversion (3.2.2) to achieve simultaneous insertion
and inflation
3.2.4
inflation
the process of expanding a lining tube (3.2.15) to achieve a close fit (3.2.6) to the existing pipeline by the use
of externally supplied fluid (water or air) pressure
3.2.5
winched-in-place insertion
method whereby the flat lining tube (3.2.15) 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 (3.2.4) is achieved by inversion (3.2.2) through the pulled-in lining
tube (3.2.15) of a separate impregnated tube or dry hose, which is either withdrawn after resin cure or left in place as
a permanent internal membrane.

a
Within scope of this document covering piping systems of 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

oSIST prEN ISO 11300-2:2025
ISO/DIS 11300-2:2025(en)
3.2.6
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
3.2.7
abrasion layer
inner layer of composite (3.2.11) of declared thickness provided as a sacrificial layer for abrasion of the CIPP
liner (3.2.9) in service
Note 1 to entry: The abrasion layer thickness is expressed using the symbol e (see 4.1).
c,a
3.2.8
carrier material
porous component of the lining tube (3.2.15), which carries the liquid resin system (3.2.21) during insertion into
the pipe being renovated and forms part of the installed lining system (3.1.12) once the resin has been cured
3.2.9
CIPP liner
lining tube (3.2.15) after installation and resin cure
3.2.10
CIPP product
cured-in-place pipe product
CIPP liner (3.2.9) of a particular design, produced from a lining tube (3.2.15) 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 (3.2.21) and installed by a specific process
3.2.11
composite
combination of cured resin system (3.2.21), either carrier material (3.2.8) or reinforcement (3.2.20), or both,
excluding any internal or external membranes
Note 1 to entry: Pure resin not wholly contained within the carrier material is nevertheless part of the composite.
3.2.12
curing
process of resin polymerization, which may be initiated or accelerated by the use of heat or exposure to light
3.2.13
design thickness
e
c,d
required wall thickness of the composite (3.2.11), excluding any abrasion layer (3.2.7), as determined by
structural design
3.2.14
lateral connection collar
fitting for reconnecting a lined main pipe to an existing or renovated lateral pipe
3.2.15
lining tube
flexible tube, consisting of resin system (3.2.21), carrier material (3.2.8) and either reinforcement (3.2.20) or
membranes or both, as combined prior to insertion in the pipe to be lined
3.2.16
permanent membrane
internal or external membrane designed to retain its integrity through the processes of lining tube (3.2.15)
insertion and resin system (3.2.21) cure, and to provide functions for the operational life of the CIPP liner (3.2.9)

oSIST prEN ISO 11300-2:2025
ISO/DIS 11300-2:2025(en)
3.2.17
semi-permanent membrane
internal or external membrane designed to retain its integrity through the processes of lining tube (3.2.15)
insertion and resin system (3.2.21) cure, but not relied on to retain its integrity at the “I” stage
3.2.18
temporary membrane
membrane forming the internal or external surface of the lining tube (3.2.15) 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.
3.2.19
preliner
permanent or semi-permanent external membrane which is installed separately before the insertion of the
lining tube (3.2.15)
3.2.20
reinforcement
fibres incorporated in the lining tube (3.2.15) which enhance the dimensional stability of either the lining
tube (3.2.15) or the structural properties, or both of the CIPP liner (3.2.9)
Note 1 to entry: The reinforcement can be incorporated in the carrier material (3.2.8), constitute the carrier material,
or can be a separate layer.
3.2.21
resin system
thermosetting resin including either the curing (3.2.12) agent(s) or initiators, or both and any fillers or other
additives in specified proportions
3.2.22
nominal CIPP “M” stage wall thickness
e
n,M
one of a range of discrete wall thicknesses of the dry fibre components of the lining tube (3.2.15) wall
thicknesses dictated by the sum of the thicknesses of the individual layers of carrier material (3.2.8) and
reinforcement (3.2.20) used for tube construction at the “M” stage, prior to their impregnation with the resin
system (3.2.21) and excluding any internal or external membranes
Note 1 to entry: Applicable only where dry tube manufacture and resin impregnation undertaken as separate
processes.
3.2.23
nominal CIPP “I” stage wall thickness
e
n,I
one of a range of discrete CIPP liner (3.2.9) wall thicknesses at the “I” stage, dictated by the sum of the
thicknesses of the individual layers of materials used for lining tube (3.2.15) construction, excluding any
internal or external membranes
3.3 Terms related to characteristics
3.3.1
nominal size DN/OD
DN/OD
numerical designation of the size of a component related to the outside diameter
Note 1 to entry: It is a convenient round number approximately equal to the manufacturing dimension in millimetres
(mm). It is not applicable to components designated by thread size.
[SOURCE: ISO 4427-1:2019, 3.1.1]

oSIST prEN ISO 11300-2:2025
ISO/DIS 11300-2:2025(en)
3.3.2
nominal outside diameter
d
n
specified outside diameter assigned to a nominal size DN/OD
Note 1 to entry: Nominal outside diameter is expressed in millimetres.
[SOURCE: ISO 4427-1:2019, 3.1.2]
3.3.3
mean outside diameter
d
em
value of the measurement of the outer circumference of a pipe or spigot end of a fitting in any cross-section,
divided by π (= 3,142) and rounded to the next greater 0,1 mm
[SOURCE: ISO 4427-1:2019, 3.1.4]
3.3.4
minimum mean outside diameter
d
em,min
minimum value for the mean outside diameter as specified for a given nominal size
[SOURCE: ISO 4427-1:2019, 3.1.5]
3.3.5
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 CIPP liner (3.2.9), measured to mid-thickness of the composite (3.2.11)
[SOURCE: ISO 23856:2021, 3.3 — modified]
3.3.6
wall thickness
e
value of the measurement of the wall thickness at any point around the circumference of a component
3.3.7
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
3.3.8
minimum wall thickness at any point
e
min
minimum value for the wall thickness at any point around the circumference of a component, as specified
[SOURCE: ISO 4427-1:2019, 3.1.10]
3.3.9
nominal wall thickness
e
n
numerical designation of the wall thickness of a component which is a convenient round number,
approximately equal to the manufacturing dimension in millimetres
[SOURCE: ISO 4427-1:2019, 3.1.8, modified by removal of Note 1 to entry which is not relevant to this
document.]
oSIST prEN ISO 11300-2:2025
ISO/DIS 11300-2:2025(en)
3.3.10
total thickness
e
tot
nominal thickness of CIPP liner (3.2.9) comprising the composite (3.2.11) and any semi-permanent (3.2.17)
and permanent membranes (3.2.16)
3.3.11
composite thickness
e
c
thickness of composite (3.2.11) at the “I” stage (3.4.2).
3.3.12
standard dimension ratio
SDR
numerical designation of a pipe series, which is a convenient round number, approximately equal to the
dimension ratio of the nominal outside diameter, d , and the nominal wall thickness, e
n n
[SOURCE: ISO 4427-1:2019, 3.1.14]
3.3.13
first break
first major discontinuity of the stress-strain curve characterised by a sudden drop in stress associated with
local failure of the composite (3.2.11)
Note 1 to entry: It is also generally accompanied by an audible
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