Iso 21138 1 2020

INTERNATIONAL ISO
STANDARD 21138-1
Second edition
2020-01
Plastics piping systems for non-

pressure underground drainage and
sewerage — Structured-wall piping
systems of unplasticized poly(vinyl
chloride) (PVC-U), polypropylene (PP)
and polyethylene (PE) —
iTeh STANDARD
Part 1: PREVIEW
Material specification and
(standards.iteh.ai)
performance
ISO 21138-1:2020 criteria for pipes, fittings
and systems
https://standards.iteh.ai/catalog/standards/sist/ffd69177-3290-419b-ac43-
9903b6ba3d46/iso-21138-1-2020
Systèmes de canalisations en plastique pour les branchements et les
collecteurs d'assainissement sans pression enterrés — Systèmes de
canalisations à parois structurées en poly(chlorure de vinyle) non
plastifié (PVC-U), polypropylène (PP) et polyéthylène (PE) —
Partie 1: Spécification des matières et critères de performance des
tubes, raccords et système
Reference number
ISO 21138-1:2020(E)
© ISO 2020
ISO 21138-1:2020(E)

iTeh STANDARD PREVIEW

(standards.iteh.ai)
ISO 21138-1:2020
9903b6ba3d46/iso-21138-1-2020
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ii © ISO 2020 – All rights reserved

ISO 21138-1:2020(E)

Contents Page
Foreword......................................................................................................................................................................................................................................... iv
Introduction...................................................................................................................................................................................................................................v
1 Scope.................................................................................................................................................................................................................................. 1
2 Normative references....................................................................................................................................................................................... 1
3 Terms, definitions, symbols and abbreviated terms........................................................................................................ 3
3.1 Terms and definitions........................................................................................................................................................................ 3
3.2 Symbols.......................................................................................................................................................................................................... 5
3.3 Abbreviated terms................................................................................................................................................................................ 6
4 Material........................................................................................................................................................................................................................... 6
4.1 General............................................................................................................................................................................................................ 6
4.2 Sealing ring retaining components......................................................................................................................................... 6
4.3 Sealing rings............................................................................................................................................................................................... 6
4.4 Fused or welded joints...................................................................................................................................................................... 6
5 Designation of wall construction.......................................................................................................................................................... 6
6 Colour................................................................................................................................................................................................................................ 7
7 Geometrical characteristics....................................................................................................................................................................... 7
8 Types of fitting......................................................................................................................................................................................................... 7
8.1 General............................................................................................................................................................................................................ 7
8.2 Design length of fittings................................................................................................................................................................... 9
9 (standards.iteh.ai)
Functional characteristics ........................................................................................................................................................................ 10
10 Relation between ring stiffness,ISO installation
21138-1:2020 technique and resulting deflection.........................10
Annex A (informative) General material characteristics of PVC-U, PP and PE pipes and fittings.......12
9903b6ba3d46/iso-21138-1-2020
Annex B (informative) General performance characteristics of PVC-U, PP and PE............................................13
Annex C (informative) Structural design........................................................................................................................................................14
Bibliography.............................................................................................................................................................................................................................. 17
© ISO 2020 – All rights reserved iii

ISO 21138-1:2020(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 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. (standards.iteh.ai)
This document was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for
the transport of fluids, Subcommittee SC 1, Plastics ISOpipes and fittings for soil, waste and drainage (including
21138-1:2020
land drainage). https://standards.iteh.ai/catalog/standards/sist/ffd69177-3290-419b-ac43-
9903b6ba3d46/iso-21138-1-2020
This second edition cancels and replaces the first edition (ISO 21138-1:2007), which has been
technically revised. The main changes compared to the previous edition are as follows:
— the normative references have been updated;
— references to EN test methods have been updated to ISO test methods, when applicable;
— editorial improvements have been made for clarification.
A list of all parts in the ISO 21138 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.
iv © ISO 2020 – All rights reserved

ISO 21138-1:2020(E)

Introduction
The ISO 21138 series of standards covers plastics piping systems for non-pressure underground
drainage and sewerage, in particular thermoplastics structured-wall piping systems.

(standards.iteh.ai)
ISO 21138-1:2020
9903b6ba3d46/iso-21138-1-2020
© ISO 2020 – All rights reserved v

(standards.iteh.ai)
ISO 21138-1:2020
9903b6ba3d46/iso-21138-1-2020
INTERNATIONAL STANDARD ISO 21138-1:2020(E)
Plastics piping systems for non-pressure underground

drainage and sewerage — Structured-wall piping
systems of unplasticized poly(vinyl chloride) (PVC-U),
polypropylene (PP) and polyethylene (PE) —
Part 1:
Material specification and performance criteria for pipes,
fittings and systems
1 Scope
This document, together with ISO 21138-2 and ISO 21138-3, specifies the definitions and requirements
for pipes, fittings and systems based on unplasticized poly(vinyl chloride) (PVC-U), polypropylene
(PP) and polyethylene (PE) structured-wall piping systems intended to be used in non-pressure
underground drainage and sewerage applications.
NOTE 1 Pipes, fittings and the system complying with this document can also be used for highway drainage
and surface water. iTeh STANDARD PREVIEW
This document covers a range (standards.iteh.ai)
of pipe and fitting sizes, materials, pipe constructions, nominal ring
stiffnesses, and gives recommendations concerning colours.
ISO 21138-1:2020
NOTE 2 It is the responsibility of the purchaser or specifier to make the appropriate selections from these
aspects, taking into account their particular requirements and installation practices or codes.
9903b6ba3d46/iso-21138-1-2020
In conjunction with ISO 21138-2 and ISO 21138-3, this document is applicable to structured-wall pipes
and fittings, to their joints and to joints with components of other plastics and non-plastics materials.
It is applicable to structured-wall pipes and fittings with or without an integral socket with elastomeric
ring seal joints as well as welded and fused joints.
NOTE 3 Pipes, fittings and other components conforming to any plastics product standards referred to in
the Bibliography can be used with pipes and fittings conforming to this document when they conform to the
requirements for joint dimensions given in ISO 21138-2 and ISO 21138-3 and to the performance requirements
given in Clause 9.
NOTE 4 For dimensions larger than DN/OD 1200 or DN/ID 1200, this document can serve as a general guideline
regarding appearance, colour, physical and mechanical characteristics as well as performance requirements.
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 472, Plastics — Vocabulary
ISO 580, Plastics piping and ducting systems — Injection-moulded thermoplastics fittings — Methods for
visually assessing the effects of heating
ISO 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special
characteristics
© ISO 2020 – All rights reserved 1

ISO 21138-1:2020(E)

ISO 1133-1, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR)
of thermoplastics — Part 1: Standard method
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 1183-1, Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion
method, liquid pycnometer method and titration method
ISO 2505, Thermoplastics pipes — Longitudinal reversion — Test method and parameters
ISO 2507-1, Thermoplastics pipes and fittings — Vicat softening temperature — Part 1: General test method
ISO 2507-2, Thermoplastics pipes and fittings — Vicat softening temperature — Part 2: Test conditions for
unplasticized poly(vinyl chloride) (PVC-U) or chlorinated poly(vinyl chloride) (PVC-C) pipes and fittings and
for high impact resistance poly (vinyl chloride) (PVC-HI) pipes
ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 3127, Thermoplastics pipes — Determination of resistance to external blows — Round-the-clock method
ISO 9852, Unplasticized poly(vinyl chloride) (PVC-U) pipes — Dichloromethane resistance at specified
temperature (DCMT) — Test method
ISO 9967, Thermoplastics pipes — Determination of creep ratio
(standards.iteh.ai)
ISO 9969, Thermoplastics pipes — Determination of ring stiffness
ISO 11173, Thermoplastics pipes — Determination ISOof21138-1:2020
resistance to external blows — Staircase method
ISO 11357-6, Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation
9903b6ba3d46/iso-21138-1-2020
induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT)
ISO 11922-1, Thermoplastics pipes for the conveyance of fluids — Dimensions and tolerances — Part 1:
Metric series
ISO 12091, Structured-wall thermoplastics pipes — Oven test
ISO 13254, Thermoplastics piping systems for non-pressure applications — Test method for watertightness
ISO 13259, Thermoplastics piping systems for underground non-pressure applications — Test method for
leaktightness of elastomeric sealing ring type joints
ISO 13262, Thermoplastics piping systems for non-pressure underground drainage and sewerage —
Thermoplastics spirally-formed structured-wall pipes — Determination of the tensile strength of a seam
Thermoplastics fittings — Test method for impact strength
Thermoplastics fittings — Test method for mechanical strength or flexibility of fabricated fittings
ISO 13265, Thermoplastics piping systems for non-pressure underground drainage and sewerage — Joints
for buried non-pressure applications — Test method for the long-term sealing performance of joints with
elastomeric seals by estimating the sealing pressure
ISO 13967, Thermoplastics fittings — Determination of ring stiffness
ISO 13968, Plastics piping and ducting systems — Thermoplastics pipes — Determination of ring flexibility
2 © ISO 2020 – All rights reserved

ISO 21138-1:2020(E)

ISO 21138-2, Plastics piping systems for non-pressure underground drainage and sewerage — Structured-
wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene
(PE) — Part 2: Pipes and fittings with smooth external surface, Type A
ISO 21138-3, Plastics piping systems for non-pressure underground drainage and sewerage — Structured-
wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene
(PE) — Part 3: Pipes and fittings with non-smooth external surface, Type B
EN 681-1, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 1: Vulcanized rubber
applications — Part 2: Thermoplastic elastomers
applications — Part 4: Cast polyurethane sealing elements
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 472, ISO 1043-1, ISO 11922-1
and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://w ww.electropedia.org/
(standards.iteh.ai)
— ISO Online browsing platform: available at http://w ww.iso.org/obp
ISO 21138-1:2020
3.1.1 General terms
9903b6ba3d46/iso-21138-1-2020
3.1.1.1
structured-wall pipes and fittings
products that have an optimized design with regard to material usage to achieve the physical,
mechanical and performance requirements of this document
Note 1 to entry: For a description of the particular designs covered by this document, see ISO 21138-2 for Type A
and ISO 21138-3 for Type B. Type A pipes have an internal and external plain surface. Type B pipes have an
internal plain surface and a hollow spiral or annular ribbed external surface.
3.1.1.2
fabricated fitting
fitting manufactured by heat forming and/or joining more than one piece of pipe and/or moulded
component
Note 1 to entry: Sealing rings retaining components are not considered as a piece.
3.1.2 Geometrical terms
3.1.2.1
nominal size
DN
numerical designation of the size of a component, other than a component designated by thread size,
which is approximately equal to the manufacturing dimension in millimetres
Note 1 to entry: The nominal size is either related to the outside diameter, or to the inside diameter

ISO 21138-1:2020(E)

3.1.2.2
nominal diameter
dn
specified diameter, in millimetres, assigned to a nominal size (DN/OD or DN/ID)
3.1.2.3
outside diameter
de
value of the measurement of the outside diameter through its cross-section at any point of a pipe or
spigot, rounded to the next greater 0,1 mm
Note 1 to entry: For Type B constructions, see ISO 21138-3.
3.1.2.4
mean outside diameter
dem
value of the measurement of the outer circumference of a pipe or spigot in any cross-section divided by
π (= 3,142), rounded up to the nearest 0,1 mm
Note 1 to entry: For Type B constructions, see ISO 21138-3.
3.1.2.5
mean inside diameter
dim
average value of a number of equally spaced measurements of inside diameter in the same cross-section
of a pipe or fitting iTeh STANDARD PREVIEW
3.1.2.6
(standards.iteh.ai)
minimum mean inside diameter of a socket
Dim,min
average value of equally spaced measurements ISO 21138-1:2020
of inside diameter in the same cross-section of a socket
3.1.2.7 9903b6ba3d46/iso-21138-1-2020
wall thickness
e
measured wall thickness at any point of the body of a component
3.1.2.8
wall thickness of the inside layer
waterway wall thickness
e4
<Type A1> thickness at any point of the inner layer of a pipe or fitting
Note 1 to entry: See ISO 21138-2, Figure 1.
3.1.2.9
wall thickness of the inside layer
waterway wall thickness
e4
<Type B> thickness at any point of the wall between the ribs or corrugations of the pipe or fitting
Note 1 to entry: See ISO 21138-3, Figure 4.
3.1.2.10
wall thickness of the inside layer under a hollow section
e5
thickness at any point of the inside wall between a hollow section and the inside surface of the Type A2
or Type B pipe or fitting
Note 1 to entry: See ISO 21138-2, Figure 2 and ISO 21138-3, Figure 4.
4 © ISO 2020 – All rights reserved

ISO 21138-1:2020(E)

3.1.2.11
construction height
ec
radial distance between the top of ribs or corrugation and the inside surface of the wall, in the case of
Type B pipes and fittings or between the outside surface of the wall and the inside surface of the wall, in
the case of Type A1 and Type A2 pipes and fittings
3.1.2.12
minimum length of a spigot
L1,min
minimum permitted value for the length of a spigot of a pipe or fitting
3.1.2.13
nominal ring stiffness
SN
numerical designation of the ring stiffness of the pipe or fitting, which is a convenient round number,
indicating the minimum required ring stiffness of the pipe or stiffness of the fitting
3.1.2.14
fitting stiffness
mechanical characteristic of a fitting, which is a measure of the resistance to ring deflection under an
external force as determined in accordance with ISO 13967
3.1.3 Material terms
3.1.3.1 iTeh STANDARD PREVIEW

virgin material
(standards.iteh.ai)
material in form such as granules or powder that have not been subjected to use or processing other than
that required for their manufacture and to which no reprocessed or recycled materials have been added
ISO 21138-1:2020
3.1.3.2 https://standards.iteh.ai/catalog/standards/sist/ffd69177-3290-419b-ac43-
internal (own) reprocessed material 9903b6ba3d46/iso-21138-1-2020
material prepared from rejected unused pipes or fittings, including trimmings from the production
of pipes and fittings, that will be reprocessed in a manufacturer’s plant after having been previously
processed by the same manufacturer by a process such as moulding or extrusion and for which the
complete formulation is known
3.1.3.3
external recycled material
material comprising either one of the following:
a) material from rejected unused pipes or fittings, or trimmings therefrom, that will be reprocessed
and that were originally processed by another manufacturer;
b) material from used pipes or fittings that have been cleaned and crushed or ground;
c) material from the production of unused thermoplastics products other than pipes and fittings,
regardless of where they are manufactured
d) material from used thermoplastics products other than pipes or fittings which have been cleaned
and crushed or ground
3.2 Symbols
dn1 nominal diameter of the main of a branch/saddle branch
dn2 nominal diameter of the branch of a branch/saddle branch
L axial cover by a saddle branch

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Plastics piping systems for non-

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Plastics piping systems for non-pressure underground

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3 Terms, definitions, symbols and abbreviated terms

3.1 Terms and definitions

3.1.2 Geometrical terms

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4 ﻿ © ISO 2020 – All rights reserved

3.1.3 Material terms

3.1.3.1 iTeh STANDARD PREVIEW

dn1 nominal diameter of the main of a branch/saddle branch

dn2 nominal diameter of the branch of a branch/saddle branch

L axial cover by a saddle branch

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