FprEN ISO 11300-1

SLOVENSKI STANDARD
oSIST prEN ISO 11300-1:2025
01-marec-2025
Cevni sistemi za obnovo podzemnih odtokov, kanalizacije in vodovodnih omrežij -
1. del: Polietilen (PE) (ISO/DIS 11300-1:2025)
Piping systems for rehabilitation of underground drains, sewers and water supply
networks - Part 1: Polyethylene (PE) material (ISO/DIS 11300-1:2025)
Rohrleitungssysteme für die Sanierung von unterirdischen Entwässerungs-,
Kanalisations- und Wasserversorgungsnetzen - Teil 1: Werkstoff Polyethylen (PE)
(ISO/DIS 11300-1:2025)
Systèmes de canalisations pour la réhabilitation des branchements, des collecteurs
d’assainissement et des réseaux d’alimentation en eau enterrés - Partie 1: Matériau
polyéthylène (PE) (ISO/DIS 11300-1:2025)
Ta slovenski standard je istoveten z: prEN ISO 11300-1
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 11300-1:2025 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN ISO 11300-1:2025
oSIST prEN ISO 11300-1:2025
DRAFT
International
Standard
ISO/DIS 11300-1
ISO/TC 138/SC 8
Piping systems for rehabilitation
Secretariat: JISC
of underground drains, sewers and
Voting begins on:
water supply networks —
2025-01-03
Part 1:
Voting terminates on:
2025-03-28
Polyethylene (PE) material
ICS: 93.030; 91.140.80; 23.040.20; 23.040.45; 93.025
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 11300-1:2025(en)
oSIST prEN ISO 11300-1:2025
ISO/DIS 11300-1:2025(en)
© ISO 2025
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
oSIST prEN ISO 11300-1:2025
ISO/DIS 11300-1:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 3
3.1 General .3
3.2 Terms related to techniques .5
3.3 Terms related to characteristics.6
3.4 Terms related to product stages .9
3.5 Terms related to materials .9
3.6 Terms related to Service conditions .10
3.7 Terms related to Joints .11
4 Symbols and abbreviated terms.11
4.1 Symbols .11
4.2 Abbreviated terms . 12
5 Pipes .13
5.1 Materials . 13
5.1.1 General . 13
5.1.2 Virgin material . 13
5.1.3 Reprocessable material and recyclable material . 13
5.2 General characteristics . 13
5.2.1 Appearance . 13
5.2.2 Colour . 13
5.3 Material characteristics . 13
5.4 Geometric characteristics .14
5.5 Mechanical characteristics .14
5.6 Physical characteristics .14
5.7 Jointing.14
5.8 Marking . 15
5.9 Regional requirements for pipes . 15
6 Fittings .15
6.1 Materials . 15
6.2 General characteristics .16
6.3 Material characteristics .16
6.4 Geometric characteristics .16
6.5 Mechanical characteristics .16
6.6 Physical characteristics .16
6.7 Jointing.16
6.8 Marking .16
6.9 Regional requirements for fittings .16
7 Ancillary components . 16
8 Fitness for purpose . 17
8.1 Materials .17
8.2 General characteristics .17
8.3 Geometric characteristics .17
8.4 Mechanical characteristics .18
8.5 Sampling .18
8.6 Regional requirements for pipes .18
9 Installation practice .18
9.1 Preparatory work .18
9.2 Storage, handling and transport of pipes and fittings .19

iii
oSIST prEN ISO 11300-1:2025
ISO/DIS 11300-1:2025(en)
9.3 Equipment .19
9.3.1 General .19
9.3.2 Butt fusion equipment and de-beading equipment . 20
9.3.3 Pipe skids/rollers . . 20
9.3.4 Winching and rod-pulling equipment . . 20
9.3.5 Pipe entry guides . 20
9.3.6 Electrofusion equipment . 20
9.3.7 Inspection equipment .21
9.3.8 Lifting equipment .21
9.4 Installation .21
9.4.1 General .21
9.4.2 Safety precautions . 22
9.4.3 Simulated installations . 22
9.5 Process-related inspection and testing . 22
9.6 Pipe end termination . 23
9.7 Reconnection to the existing pipeline system . 23
9.8 Final inspection and testing . 23
9.9 Documentation . 23
Annex A (normative) Additional requirements applicable for Lining with Continuous pipes .24
Annex B (normative) Additional requirements applicable for Lining with Close-fit pipes .26
Annex C (normative) Additional requirements for Trenchless replacement techniques - pipe
bursting, pipe extraction, HDD and impact moling .31
Annex D (normative) Layered pipes .36
Annex E (normative) Factory-folded heat-reverted polyethylene (PE) pipe — Determination of
memory ability .37
Annex F (informative) Pipe design considerations particular to pipe bursting and pipe
extraction .39
Annex G (informative) Pipe design considerations particular to HDD . 41
Bibliography .43

iv
oSIST prEN ISO 11300-1:2025
ISO/DIS 11300-1:2025(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).
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 polyethylene (PE) material, this document replaces
the related content, including requirements, of the system standards:
ISO 11296-1, -2, -3, ISO 11297-1, -2, -3, ISO 11298-1, -2, -3 and ISO 21225-1, -2.
ISO 11300-2 similarly replaces for piping systems using Thermoset composite materials, the content of the
standards: ISO 11296-1, -4, ISO 11297-1, -4 and ISO 11298-1, -4.
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 (and ISO 11298-1, -11).
A list of all parts in the ISO 11300 series, can be found on the ISO website.
Once all three parts of ISO 11300 have been published, the above mentioned replaced standards will be
withdrawn.
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.

v
oSIST prEN ISO 11300-1:2025
ISO/DIS 11300-1:2025(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 covering a specific material per
pipe system.
ISO 11300 is subdivided in four parts:
— Part 1: Polyethylene (PE) material (this document);
— Part 2: Thermoset composite materials;
— 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 renovation technique families.
Figure 1 shows the clause structure and the relationship between ISO 11300 and ISO 11301.
[2]
For complementary information, see ISO 11295 .
[3]
For assessment of conformity to the requirements of this document, see ISO/TS 23818-1 .
System Standard ISO 11300 covers the relevant content of and replaces the following previous System
Standards for the rehabilitation of existing drains and sewers;
— 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.
vi
oSIST prEN ISO 11300-1:2025
ISO/DIS 11300-1:2025(en)
Figure 1 — Format of the rehabilitation system standards

vii
oSIST prEN ISO 11300-1:2025
oSIST prEN ISO 11300-1:2025
DRAFT International Standard ISO/DIS 11300-1:2025(en)
Piping systems for rehabilitation of underground drains,
sewers and water supply networks —
Part 1:
Polyethylene (PE) material
1 Scope
This document specifies requirements and test methods for pipes and fittings which are part of piping
systems for the rehabilitation by means of renovation and trenchless replacement of underground non-
pressure and pressure drains and sewers and water supply networks, which transport water intended for
human consumption, including raw water pipelines.
It is applicable to polyethylene (PE) pipes, fittings and assemblies, as manufactured and as installed. It is not
applicable to the existing pipeline.
It is applicable to technique families for renovation:
— lining with continuous pipes;
— lining with close-fit pipes;
and technique families for trenchless replacement:
— pipe bursting and pipe extraction;
— horizontal directional drilling and impact moling.
and intended to be used at an operating temperature of 20 °C as the reference temperature.
NOTE For applications operating at constant temperatures greater than 20 °C and up to 40 °C, see ISO 4427-1:2019,
Annex A.
When used with lining with continuous pipes, lining with close-fit pipes and trenchless replacement
technique families, this document is applicable to:
— PE solid wall single layered pipes (nominal outside diameter, d ), including any identification stripes;
n
— 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 E, where all layers have the same MRS rating.
n
Furthermore, when used with lining with continuous pipes and trenchless replacement this document is
applicable to:
— PE coated pipes (outside diameter, d ) having a peelable, contiguous, thermoplastics additional layer on
n
the outside of the pipe (“coated pipe”), as specified in Annex E.
This document is applicable to jointing by means of butt fusion and electrofusion and to fabricated and
injection-moulded fittings and mechanical connections of PE.

oSIST prEN ISO 11300-1:2025
ISO/DIS 11300-1:2025(en)
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 497, Guide to the choice of series of preferred numbers and of series containing more rounded values of
preferred numbers
ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of the
resistance to internal pressure — Part 1: General method
ISO 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of the
resistance to internal pressure — Part 2: Preparation of pipe test pieces
ISO 2505, Thermoplastics pipes — Longitudinal reversion — Test method and parameters
ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 4427-1:2019, Plastics piping systems for water supply and for drainage and sewerage under pressure —
Polyethylene (PE) — Part 1: General
ISO 4427-2, Plastics piping systems for water supply, and for drainage and sewerage under pressure —
Polyethylene (PE) — Part 2: Pipes
ISO 4427-3, Plastics piping systems for water supply, and for drainage and sewerage under pressure —
Polyethylene (PE) — Part 3: Fittings
ISO 4427-5, Plastics piping systems for water supply, and for drainage and sewerage under pressure —
Polyethylene (PE) — Part 5: Fitness for purpose of the system
ISO 4633, Rubber seals — Joint rings for water supply, drainage and sewerage pipelines — Specification for
materials
ISO 8772, Plastics piping systems for non-pressure underground drainage and sewerage — Polyethylene (PE)
ISO 9967, Thermoplastics pipes — Determination of creep ratio
ISO 9969, Thermoplastics pipes — Determination of ring stiffness
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 1:
Electrofusion
EN 681-1, Elastomeric seal — 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 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

oSIST prEN ISO 11300-1:2025
ISO/DIS 11300-1:2025(en)
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 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/
3.1 General
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, manholes, gullies and other network components
[SOURCE: ISO 6707-1:2020, 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 6707-1:2020, 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

oSIST prEN ISO 11300-1:2025
ISO/DIS 11300-1:2025(en)
3.1.8
trenchless replacement
replacement (3.1.7) without opening trenches other than small excavations to provide access for the
particular technique and for service and lateral connections
3.1.9
maintenance
routine work undertaken to ensure the existing performance of an asset
3.1.10
lining pipe
pipe for renovation purposes prior to any site processing
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)
3.1.13
replacement pipe
new pipe installed for rehabilitation purposes
3.1.14
characteristic
property, dimension or other feature of a material or component
3.1.15
declared value
limiting value of a characteristic (3.1.14) declared in advance by the lining system (3.1.12) supplier, which
becomes the requirement for the purposes of assessment of conformity
3.1.16
system test pressure
either hydrostatic or air pressure, or both applied to the installed pipeline system (3.1.1) in order to ensure
its integrity and leaktightness
3.1.17
simulated installation
installation of a lining system (3.1.12) into a simulated host pipeline (3.1.18), using representative equipment
and processes, to provide samples for testing which are representative of an actual installation
3.1.18
simulated host pipeline
section of pipeline, which is not part of an operational network, but which replicates the environment of an
operational network
3.1.19
technique family
group of rehabilitation techniques which are considered to have common characteristics for standardization
purposes
3.1.20
coated pipe
pipe with a peelable, contiguous thermoplastic additional layer on the outside of the pipe
3.1.21
solid wall single layered pipe
pipe with smooth internal and external surface, extruded from the same compound throughout the wall

oSIST prEN ISO 11300-1:2025
ISO/DIS 11300-1:2025(en)
3.1.22
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
3.1.23
interactive pressure pipe liner
liner (3.1.11) 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
3.1.24
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, sewers and water supply networks,
within the scope of pipeline rehabilitation techniques generally, are shown schematically in Figure 2. For
definitions of standardized renovation techniques shown in Figure 2, but outside the scope of this document,
see ISO 11295.
a
This document is applicable, for pipe systems made from PE materials.
Figure 2 — Technique families for rehabilitation of underground drains, sewers and water supply
networks using plastics pipes, within the scope of pipeline rehabilitation techniques
3.2.1
lining with continuous pipes
lining with pipe made continuous prior to insertion, where the diameter of the lining pipe (3.1.10) remains
unchanged
oSIST prEN ISO 11300-1:2025
ISO/DIS 11300-1:2025(en)
3.2.2
lining with close-fit pipes
lining with a continuous pipe, of which the cross-section is reduced to facilitate installation and reverted
after installation to provide a close fit (3.2.8) to the existing pipe
Note 1 to entry: For the reduction in cross-section, the following are the two options:
— reduction in the pipe manufacturing plant: the pipe is usually supplied coiled on a reel, from which it is directly
inserted;
— reduction on site: the pipe is usually fed through the reduction equipment and simultaneously inserted in one
continuous string.
3.2.3
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
3.2.4
bursting head
tool that can crack or split the existing pipe material
3.2.5
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, which is simultaneously pulled or pushed in
3.2.6
horizontal directional drilling
HDD
off the line replacement 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 to be
subsequently pulled/pushed into place
3.2.7
impact moling
off the line replacement method in which pipes are pulled in behind a pneumatically powered soil
displacement hammer
3.2.8
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
3.2.9
close-fit pipe
continuous lining pipe (3.1.10) of thermoplastic material reshaped or otherwise expanded after insertion to
achieve a close fit (3.2.8) to the existing pipeline
3.3 Terms related to characteristics
3.3.1
nominal size
DN
numerical designation of the size of a component related to the inside or 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, modified to include inside diameter as option]

oSIST prEN ISO 11300-1:2025
ISO/DIS 11300-1:2025(en)
3.3.2
nominal size DN/OD
DN/OD
nominal size, related to the outside diameter
3.3.3
nominal outside diameter
d
n
specified outside diameter, in millimetres, assigned to a nominal size DN/OD (3.3.2)
Note 1 to entry: For thermoplastics solid-wall components, the value of nominal outside diameter is identical to the
minimum mean outside diameter (3.3.5), d , defined in 3.3.5.
em,min
[SOURCE: ISO 4427-1:2019, 3.1.2, modified by addition of Note 1 to entry.]
3.3.4
mean outside diameter
d
em
value of the measurement of the outer circumference of the 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]
3.3.5
minimum mean outside diameter
d
em,min
minimum value of the mean outside diameter (3.3.4) as specified for a given nominal size (3.3.1)
[SOURCE: ISO 4427-1:2019, 3.1.5]
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 (3.3.6), regularly spaced around the
circumference and in the same cross-section of a component, including the measure minimum and the
maximum measured values of the wall thickness in that cross-section
[SOURCE: ISO 4427-1:2019, 3.1.12]
3.3.8
minimum wall thickness at any point
e
min
minimum value of the wall thickness (3.3.6) 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 (3.3.6) of a component, which is a convenient round number,
approximately equal to the manufacturing dimension in millimetres (mm)
Note 1 to entry: For thermoplastics components conforming to the different parts of the ISO 4427 series, the value of
nominal wall thickness, e , is identical to the specified minimum wall thickness at any point (3.3.8), e .
n min
[SOURCE: ISO 4427-1:2019, 3.1.8]

oSIST prEN ISO 11300-1:2025
ISO/DIS 11300-1:2025(en)
3.3.10
nominal thickness of the coating
e
coating
arithmetic mean of a number of measurements of the coating thickness around the circumference and in the
same cross-section of a component
3.3.11
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 (3.3.3), d , and the nominal wall thickness (3.3.9), e
n n
[SOURCE: ISO 4427-1:2019, 3.1.14]
3.3.12
ring stiffness
resistance of a pipe to diametric deflection in response to external loading applied along one longitudinal
diametric plane
Note 1 to entry: This definition applies to both long and short-term values.
3.3.13
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.
3.3.14
lower confidence limit of the predicted hydrostatic strength
σ
LPL
quantity, with the dimensions of stress, which represents the 97,5 % lower confidence limit of the predicted
hydrostatic strength at a temperature θ and time t
Note 1 to entry: It is expressed in megapascals.
3.3.15
melt mass-flow rate
MFR
value relating to the viscosity of the molten material at a specified temperature and load
Note 1 to entry: It is expressed in grams per 10 min (g/10 min)
[SOURCE: ISO 4427-1:2019, 3.3.5]
3.3.16
minimum required strength
MRS
value of σ at 20 °C and 50 years, rounded down to the next smaller value of the R10 series when σ is
LPL LPL
below 10 MPA, or to the next smaller value of the R20 series when σ is 10 MPA or greater
LPL
[1]
Note 1 to entry: the R10 series conform to ISO 3 and the R20 series conforms to ISO 497.
[SOURCE: ISO 4427-1:2019, 3.3.2]
3.3.17
oxidation induction time
OIT
relative measure of a stabilized material’s resistance to oxidative decomposition, determined by the
calorimetric measurement of the time interval to the onset of exothermic oxidation of the material at a
specified temperature in an oxygen or air atmosphere, under atmospheric pressure

oSIST prEN ISO 11300-1:2025
ISO/DIS 11300-1:2025(en)
3.4 Terms related to product stages
The characteristics of components used for renovation and the materials from which they are made can be
considered at two distinct stages as follows.
3.4.1
“M” stage
stage as manufactured, before any subsequent site processing of components associated with the particular
renovation technique
Note 1 to entry: For pipes and fittings at the “M” stage, see Clauses 5 and 6, respectively.
3.4.2
“I” stage
stage as installed, i.e. in final configuration after any site processing of components associated with the
particular renovation technique
Note 1 to entry: For pipes and fittings at the “I” stage, see Clause 8.
3.5 Terms related to materials
3.5.1
virgin material
material in a form such as granules, powder or liquid, which has not been subjected to use or processing
other than that required for its manufacture and to which no reprocessable or recyclable material (3.5.4) has
been added
3.5.2
own reprocessable material
material prepared from clean, rejected and unused pipes, fittings, or valves, including trimmings from the
production of pipes, fittings or valves, that is reprocessed in a manufacturer’s plant after having previously
been processed by the same manufacture in the production of a component by, for example, injection
moulding or extrusion
[SOURCE:
...