EN 13476-1:2025

Plastics piping systems for non-pressure underground drains and sewers - Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) - Part 1: General requirements and performance characteristics

This document, together with EN 13476-2 and EN 13476-3, specifies the definitions and general requirements for pipes, fittings and the system based on unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) structured-wall piping systems that are intended for use in non-pressure underground drains and sewers for foul wastewater.
NOTE 1   Products complying with this document can also be used in non-pressure underground drains and sewers for surface water.
This document is applicable to:
a)   structured-wall pipes and fittings, which are to be used buried in the ground outside a building structure only; reflected by the marking of products by “U”;
b)   structured-wall pipes and fittings, which are to be used buried in ground both outside (application area code “U”) and within a building structure (application area code “D”); reflected in the marking of products by “UD”.
In conjunction with EN 13476-2 and EN 13476-3, 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.
This part specifies general aspects and gives guidance concerning a national selection of requirement levels and classes where EN 13476-2 and EN 13476-3 provide options.
EN 13476-2 and EN 13476-3 specify material characteristics, dimensions and tolerances, test methods, test parameters and requirements for pipes with smooth internal and external surfaces, Type A, and pipes with smooth internal and profiled external surfaces, Type B, respectively.
This document, together with EN 13476-2 and EN 13476-3, is applicable to a range of pipe and fitting sizes, materials, pipe constructions, stiffness classes and tolerance classes and offers recommendations concerning colours.
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 any relevant national regulations and installation practices or codes.
NOTE 3   Pipes, fittings and other components conforming to any plastic product standards referred to in Clause 2 can be used with pipes and fittings conforming to this document, when they conform to the requirements for joint dimensions given in EN 13476-2 and to the performance requirements given in Clause 9.

Kunststoff-Rohrleitungssysteme für erdverlegte drucklose Abwasserkanäle und -leitungen - Rohrleitungssysteme mit profilierter Wandung aus weichmacherfreiem Polyvinylchlorid (PVC-U), Polypropylen (PP) und Polyethylen (PE) - Teil 1: Allgemeine Anforderungen und Leistungsmerkmale

Dieses Dokument legt gemeinsam mit FprEN 13476 2 und FprEN 13476 3 Definitionen und allgemeine Anforderungen an Rohre, Formstücke und das Rohrleitungssystem aus weichmacherfreiem Polyvinylchlorid (PVC-U), Polypropylen (PP) und Polyethylen (PE) mit profilierter Wandung fest, die für erdverlegte, drucklos betriebene Schmutzwasserkanäle und  leitungen vorgesehen sind.
ANMERKUNG 1   Produkte, die diesem Dokument entsprechen, können auch in erdverlegten, drucklos betriebenen Niederschlagswasserkanälen und  leitungen verwendet werden.
Dieses Dokument gilt für:
a)   Rohre und Formstücke mit profilierter Wandung, die ausschließlich für erdverlegte Anwendungen außerhalb einer Gebäudestruktur vorgesehen sind; angezeigt durch Kennzeichnung der Produkte mit „U“;
b)   Rohre und Formstücke mit profilierter Wandung, die sowohl für erdverlegte Anwendungen außerhalb der Gebäudestruktur (Anwendungskennzeichen „U“) als auch innerhalb einer Gebäudestruktur (Anwendungskennzeichen „D“) vorgesehen sind; angezeigt durch Kennzeichnung der Produkte mit „UD“.
Gemeinsam mit FprEN 13476 2 und FprEN 13476 3 gilt dieser Teil für Rohre und Formstücke mit profilierter Wandung sowohl mit glatten Enden als auch mit angeformter Muffe mit elastomeren Dichtringverbindungen bzw. Verbindung durch Heizelement-Stumpf-, Extrusions- oder Heizwendelschweißen.
Dieser Teil legt allgemeine Aspekte fest und gibt Empfehlungen zur Auswahl nationaler Anforderungsstufen und  klassen, wofür Teil 2 und Teil 3 dieser Norm die Optionen enthalten.
FprEN 13476 2 und FprEN 13476 3 legen jeweils Werkstoffeigenschaften, Abmessungen und Toleranzen, Prüfverfahren, Prüfparameter und Anforderungen für Rohre mit glatten Innen- und Außenflächen, Typ A, sowie Rohre mit glatten Innen- und profilierten Außenflächen, Typ B, fest.
Dieses Dokument gilt gemeinsam mit FprEN 13476 2 und FprEN 13476 3 für verschiedene Abmessungen von Rohren und Formstücken, Werkstoffe, Rohrkonstruktionen, Steifigkeitsklassen und Toleranzklassen und gibt Empfehlungen für die Einfärbung.
ANMERKUNG 2   Der Käufer bzw. Auftraggeber ist unter Berücksichtigung der eigenen Anforderungen sowie der geltenden nationalen Festlegungen und Verlegeverfahren und  vorschriften für die entsprechende Auswahl dieser Kriterien verantwortlich.
ANMERKUNG 3   Rohre, Formstücke und andere Rohrleitungsteile, die einer der in Abschnitt 2 aufgeführten Anwendungsnormen für Kunststoff-Rohrleitungssysteme entsprechen, können mit Rohren und Formstücken nach diesem Dokument verwendet werden, sofern sie die Anforderungen an die Anschlussabmessungen nach Teil 2 dieser Norm und die Anforderungen an die Leistungsfähigkeit nach Abschnitt 9 erfüllen.

Systèmes de canalisations en plastique pour les branchements et les collecteurs d'assainissements 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 : Exigences générales et caractéristiques de performance

Le présent document, conjointement à l’EN 13476 2 et l’EN 13476 3, spécifie les définitions et les exigences générales pour les tubes, les raccords et le système pour des systèmes de canalisations à parois structurées en poly(chlorure de vinyle) non plastifié (PVC U), polypropylène (PP) et polyéthylène (PE), destinés à être utilisés dans des branchements et collecteurs d’assainissement enterrés sans pression pour les eaux usées.
NOTE  1      Les produits conformes au présent document peuvent également être utilisés dans les branchements et les collecteurs d’assainissement enterrés sans pression pour les eaux de surface.
Le présent document s’applique aux :
a)   tubes et raccords à parois structurées, destinés à être utilisés enterrés à l’extérieur de la structure du bâtiment uniquement ; ce qui est reflété au niveau du marquage des produits par « U » ;
b)   tubes et raccords à parois structurées, destinés à être utilisés enterrés, aussi bien à l’extérieur (code de la zone d’application « U ») qu’à l’intérieur de la structure des bâtiments (code de la zone d’application « D ») ; ce qui est reflété au niveau du marquage des produits par « UD ».
Conjointement à l’EN 13476 2 et l’EN 13476 3, elle s’applique aux tubes et raccords à parois structurées avec ou sans emboîture intégrée avec des assemblages à bague d’étanchéité en élastomère ainsi que des assemblages soudés et les assemblages obtenus par fusion.
La présente partie spécifie des aspects généraux et fournit des préconisations concernant une sélection nationale des niveaux et classes d’exigences alors que l‘EN 13476-2 et l’EN 13476-3 prévoient des options.
L’EN 13476 2 et l’EN 13476 3 spécifient les caractéristiques de la matière, les dimensions et les tolérances, les méthodes d’essai, les paramètres d’essai et les exigences applicables aux tubes avec une surface interne et une surface externe lisses, de Type A, et aux tubes avec une surface interne lisse et une surface externe profilée, de Type B, respectivement.
Le présent document, conjointement à l’EN 13476 2 et l’EN 13476 3, est applicable à une gamme de dimensions de tubes et de raccords, de matières, de constructions de tube, de classes de rigidité et de classes de tolérance et donne des recommandations concernant les couleurs.
NOTE 2   Il est de la responsabilité de l’acheteur ou du concepteur du réseau de faire les sélections appropriées à partir de ces aspects, en tenant compte des exigences particulières et des règles nationales et des pratiques ou codes de pose pertinents.
NOTE 3   Les tubes, raccords et autres composants conformes aux normes de produits plastiques indiquées à l’Article 2 peuvent être utilisés avec des tubes et des raccords conformes au présent document, lorsqu’ils satisfont aux exigences dimensionnelles des assemblages indiquées dans l’EN 13476 2 et aux exigences de performance indiquées à l’Article 9.

Cevni sistemi iz polimernih materialov za odvodnjavanje in kanalizacijo, ki delujejo po težnostnem principu in so položeni v zemljo - Cevni sistemi s strukturirano steno iz nemehčanega polivinilklorida (PVC-U), polipropilena (PP) in polietilena (PE) - 1. del: Splošne zahteve in zahtevane lastnosti

General Information

• Status: Published
• Publication Date: 07-Oct-2025
• ICS: 23.040.01 - Pipeline components and pipelines in general
• ICS: 93.030 - External sewage systems
• Technical Committee: CEN/TC 155 - Plastics piping systems and ducting systems
• Drafting Committee: CEN/TC 155/WG 13 - Systems with structured-wall pipes for non-pressure drainage and sewerage - PE, PP, PVC-U
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 08-Oct-2025
• Due Date: 06-Sep-2025
• Completion Date: 08-Oct-2025
• Ref Project: SIST EN 13476-1:2025 - 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: General requirements and performance characteristics

Relations

• Replaces: EN 13476-1:2018 - 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:General requirements and performance characteristics
• Effective Date: 05-Jul-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2025
Cevni sistemi iz polimernih materialov za odvodnjavanje in kanalizacijo, ki delujejo
po težnostnem principu in so položeni v zemljo - Cevni sistemi s strukturirano
steno iz nemehčanega polivinilklorida (PVC-U), polipropilena (PP) in polietilena
(PE) - 1. del: Splošne zahteve in zahtevane lastnosti
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: General requirements and
performance characteristics
Kunststoff-Rohrleitungssysteme für erdverlegte drucklose Abwasserkanäle und -
leitungen - Rohrleitungssysteme mit profilierter Wandung aus weichmacherfreiem
Polyvinylchlorid (PVC-U), Polypropylen (PP) und Polyethylen (PE) - Teil 1: Allgemeine
Anforderungen und Leistungsmerkmale
Systèmes de canalisations en plastique pour les branchements et les collecteurs
d'assainissements 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 : Exigences générales et caractéristiques de performance
Ta slovenski standard je istoveten z: EN 13476-1:2025
ICS:
23.040.01 Deli cevovodov in cevovodi Pipeline components and
na splošno pipelines in general
91.140.80 Drenažni sistemi Drainage 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 13476-1
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2025
EUROPÄISCHE NORM
ICS 23.040.01; 93.030 Supersedes EN 13476-1:2018
English Version
Plastics piping systems for non-pressure underground
drains and sewers - Structured-wall piping systems of
unplasticized poly(vinyl chloride) (PVC-U), polypropylene
(PP) and polyethylene (PE) - Part 1: General requirements
and performance characteristics
Systèmes de canalisations en plastique pour les Kunststoff-Rohrleitungssysteme für erdverlegte
branchements et les collecteurs d'assainissements sans drucklose Abwasserkanäle und -leitungen -
pression enterrés - Systèmes de canalisations à parois Rohrleitungssysteme mit profilierter Wandung aus
structurées en poly(chlorure de vinyle) non plastifié weichmacherfreiem Polyvinylchlorid (PVC-U),
(PVC-U), polypropylène (PP) et polyéthylène (PE) - Polypropylen (PP) und Polyethylen (PE) - Teil 1:
Partie 1 : Exigences générales et caractéristiques de Allgemeine Anforderungen und Leistungsmerkmale
performance
This European Standard was approved by CEN on 23 June 2025.

This European Standard was corrected and reissued by the CEN-CENELEC Management Centre on 15 October 2025.

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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13476-1:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 9
3.1 General definitions . 9
3.2 Geometrical definitions . 10
3.3 Material definitions . 12
3.4 Symbols and abbreviations . 14
4 Material . 14
4.1 General . 14
4.2 Utilization of reworked material and recyclate . 14
4.3 Sealing ring retaining components . 14
4.4 Sealing rings . 14
4.5 Fused or welded joints . 15
4.6 Adhesives for PVC-U . 15
5 Designation of wall construction . 15
6 Appearance and colour . 15
6.1 Appearance . 15
6.2 Colour . 15
7 Geometrical characteristics . 15
8 Types of fittings . 16
8.1 General . 16
8.2 Design length of fittings . 19
9 System performance related test methods and characteristics . 19
10 Marking . 21
10.1 General . 21
10.2 Marking process . 22
10.3 Size . 22
Annex A (informative) Characteristics of PVC-U, PP and PE pipes and fittings . 23
A.1 General . 23
A.2 Material characteristics . 23
A.3 Chemical resistance . 23
A.4 Abrasion resistance . 23
A.5 Hydraulic roughness . 23
Annex B (informative) Recommended minimum fitting classes . 24
Annex C (informative) Designation of pipes and corresponding fittings . 25
Annex D (informative) Guidance in cleaning plastics pipes . 27
D.1 General . 27
D.2 Cleaning and unblocking . 27
D.2.1 Choosing the right equipment . 27
D.2.2 Comparing techniques . 27
D.3 Conclusions from independent jetting tests . 28
D.3.1 Assessing efficiency and impact . 28
D.3.2 Testing of plastic pipes . 28
D.3.3 Clearing tests . 28
D.4 Supplementary cleaning techniques . 28
D.5 Recommended practice principles for jetting . 29
Bibliography . 31

European foreword
This document (EN 13476-1:2025) has been prepared by 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 2026, and conflicting national standards shall be
withdrawn at the latest by April 2026.
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 13476-1:2018.
The main changes with respect to EN 13476-1:2018 are listed below:
a) updating of the ”terms” and “definition” in line with EN 14541-1;
b) “drainage and sewerage” changed into “drains and sewers” through the document;
c) NOTE 1 introduced in Scope;
d) definitions updated;
e) 6.1 Appearance updated;
f) Annex B updated;
g) editorial updates through the document.
This document is a part of a System Standard for plastics piping systems of particular materials for
specified applications. There are a number of such System Standards.
System Standards are based on the results of the work being undertaken in ISO/TC 138 “Plastics pipes,
fittings and valves for the transport of fluids”, which is a Technical Committee of the International
Organization for Standardization (ISO).
They are supported by separate standards on test methods to which references are made throughout the
System Standard.
The System Standards are consistent with general standards on functional requirements and on
recommended practice for installation.
EN 13476 consists of the following parts under the general title “Plastics piping systems for non-pressure
underground drains and sewers — Structured-wall piping systems of unplasticized poly(vinyl chloride)
(PVC-U), polypropylene (PP) and polyethylene (PE)”:
— Part 1: General requirements and performance characteristics (this document);
— Part 2: Specifications for pipes and fittings with smooth internal and external surface and the system,
Type A;
— Part 3: Specifications for pipes and fittings with smooth internal and profiled external surface and the
system, Type B;
— Part 4: Assessment of conformity (CEN/TS). (CEN/TS 13476-4:2025).
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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.
Introduction
Due to the variety in materials, pipe constructions, application areas and classes, several combinations
are possible.
The purchaser or specifier may select between these possibilities by designating the pipe and fitting
preferred for each project, as described in Annex C “Designation of pipes and corresponding fittings”,
taking into account any particular requirements and relevant national regulations and installation
practices or codes.
1 Scope
This document, together with EN 13476-2 and EN 13476-3, specifies the definitions and general
requirements for pipes, fittings and the system based on unplasticized poly(vinyl chloride) (PVC-U),
polypropylene (PP) and polyethylene (PE) structured-wall piping systems that are intended for use in
non-pressure underground drains and sewers for foul wastewater.
NOTE 1 Products complying with this document can also be used in non-pressure underground drains and
sewers for surface water.
This document is applicable to:
a) structured-wall pipes and fittings, which are to be used buried in the ground outside a building
structure only; reflected by the marking of products by “U”;
b) structured-wall pipes and fittings, which are to be used buried in ground both outside (application
area code “U”) and within a building structure (application area code “D”); reflected in the marking
of products by “UD”.
In conjunction with EN 13476-2 and EN 13476-3, 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.
This part specifies general aspects and gives guidance concerning a national selection of requirement
levels and classes where EN 13476-2 and EN 13476-3 provide options.
EN 13476-2 and EN 13476-3 specify material characteristics, dimensions and tolerances, test methods,
test parameters and requirements for pipes with smooth internal and external surfaces, Type A, and pipes
with smooth internal and profiled external surfaces, Type B, respectively.
This document, together with EN 13476-2 and EN 13476-3, is applicable to a range of pipe and fitting
sizes, materials, pipe constructions, stiffness classes and tolerance classes and offers recommendations
concerning colours.
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 any relevant national regulations and installation
practices or codes.
NOTE 3 Pipes, fittings and other components conforming to any plastic product standards referred to in Clause 2
can be used with pipes and fittings conforming to this document, when they conform to the requirements for joint
dimensions given in EN 13476-2 and to the performance requirements given in Clause 9.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
EN 476:2022, General requirements for components used in drains and sewers
EN 681-1, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 1: Vulcanized rubber
EN 681-2, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 2: Thermoplastic elastomers
EN 681-4, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 4: Cast polyurethane sealing elements
EN 14541-1:2022, Plastics pipes and fittings — Utilisation of thermoplastics recyclates — Part 1:
Vocabulary
EN 13476-2:2025, Plastics piping systems for non-pressure underground drains and sewers — Structured-
wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE)
— Part 2: Specifications for pipes and fittings with smooth internal and external surface and the system,
Type A
EN 13476-3:2025, Plastics piping systems for non-pressure underground drains and sewers — Structured-
wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE)
— Part 3: Specifications for pipes and fittings with smooth internal and profiled external surface and the
system, Type B
EN ISO 472, Plastics — Vocabulary (ISO 472)
EN ISO 580, Plastics piping and ducting systems — Injection-moulded thermoplastics fittings — Methods
for visually assessing the effects of heating (ISO 580)
EN ISO 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special
characteristics (ISO 1043-1)
EN 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 1167-1)
EN 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 1167-2)
EN ISO 2505, Thermoplastics pipes — Longitudinal reversion — Test method and parameters (ISO 2505)
EN ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions (ISO 3126)
EN ISO 3127, Thermoplastics pipes — Determination of resistance to external blows — Round-the-clock
method (ISO 3127)
EN ISO 6259-1, Thermoplastics pipes — Determination of tensile properties — Part 1: General test method
(ISO 6259-1)
EN ISO 6259-2, Thermoplastics pipes — Determination of tensile properties — Part 2: Pipes made of
unplasticized poly(vinyl chloride) (PVC-U), oriented unplasticized poly(vinyl chloride) (PVC-O), chlorinated
poly(vinyl chloride) (PVC-C) and high-impact poly(vinyl chloride) (PVC-HI) (ISO 6259-2)
EN ISO 9852, Unplasticized poly(vinyl chloride) (PVC-U) pipes — Dichloromethane resistance at specified
temperature (DCMT) — Test method (ISO 9852)
EN ISO 9967, Thermoplastics pipes — Determination of creep ratio (ISO 9967)
EN ISO 9969, Thermoplastics pipes — Determination of ring stiffness (ISO 9969)
EN ISO 11173, Thermoplastics pipes — Determination of resistance to external blows — Staircase method
(ISO 11173)
EN ISO 11357-6, Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation
induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT) (ISO 11357-6)
EN ISO 13257:2018, Thermoplastics piping systems for non-pressure applications — Test method for
resistance to elevated temperature cycling (ISO 13257:2018)
EN ISO 13259, Thermoplastics piping systems for underground non-pressure applications — Test method
for leaktightness of elastomeric sealing ring type joints (ISO 13259)
EN ISO 13260, Thermoplastics piping systems for non-pressure underground drainage and sewerage —
Test method for resistance to combined temperature cycling and external loading (ISO 13260)
EN 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
(ISO 13262)
EN ISO 13263, Thermoplastics piping systems for non-pressure underground drainage and sewerage —
Thermoplastics fittings — Test method for impact strength (ISO 13263)
EN ISO 13264, Thermoplastics piping systems for non-pressure underground drainage and sewerage —
Thermoplastics fittings — Test method for mechanical strength or flexibility of fabricated fittings
(ISO 13264)
EN ISO 13967, Thermoplastics fittings — Determination of ring stiffness (ISO 13967)
EN ISO 13968, Plastics piping and ducting systems — Thermoplastics pipes — Determination of ring
flexibility (ISO 13968)
ISO 12091, Structured-wall thermoplastics pipes — Oven test
ISO 11922-1, Thermoplastics pipes for the conveyance of fluids — Dimensions and tolerances — Part 1:
Metric series
ISO/TR 10358, Plastics pipes and fittings for industrial applications — Collection of data on combined
chemical-resistance
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 472, EN ISO 1043-1,
ISO 11922-1, EN 14541-1 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/
3.1 General definitions
3.1.1
application area code
code used in the marking of pipes and fittings to indicate the application area(s) for which they are
intended, as follows:
U: for the area more than 1 m from the building to which the buried piping system is connected;
UD: for application area U and the area under and within 1 m from the building where the pipes and fittings are
buried in ground and are connected to the soil and waste discharge system of the building
3.1.2
structured-wall pipes and fittings
pipes and fittings which 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 Clause 5 in
EN 13476-2:2025 and EN 13476-3:2025.
3.1.3
fabricated fitting
fittings produced from pipe and/or from injection-moulded fittings by thermoforming, adhesive joint or
welding
Note 1 to entry: Fabricated fittings need an additional fabrication step.
3.1.4
foul wastewater
wastewater comprising domestic wastewater and/or industrial wastewater
3.1.5
surface water
water from precipitation, which has not seeped into the ground and is discharged to the drain or sewer
system directly from the ground or from exterior building surfaces
3.2 Geometrical definitions
3.2.1
nominal size, DN
numerical designation of the size of a component, which is a convenient round number approximately
equal to the manufacturing dimension
Note 1 to entry: Nominal size is expressed in millimetres (mm).
Note 2 to entry: This designation is not used for threaded components.
3.2.2
nominal size, DN/OD
nominal size, related to the outside diameter
3.2.3
nominal size, DN/ID
nominal size, related to the inside diameter
3.2.4
nominal diameter
d
n
specified diameter assigned to a nominal size
Note 1 to entry: It is expressed in millimetres (mm).
3.2.5
outside diameter
d
e
value of the measurement of the outside diameter through its cross-section at any point of a pipe or spigot
end, rounded up to the nearest 0,1 mm
3.2.6
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 (pi ≈ 3,142), rounded up to the nearest 0,1 mm
3.2.7
mean inside diameter of a pipe or a fitting
d
im
arithmetical mean of a number of measurements of the inside diameter of a pipe or a fitting in the same
cross-section
Note 1 to entry: Alternatively for type A2 pipes, dim may be calculated as dim = d - 2 · e
em c
3.2.8
wall thickness
e
value of measurement of the wall thickness at any point around the circumference of a component
3.2.9
construction height
e
c
mean radial distance between the external and internal surfaces of the wall for Type A1 and A2 pipes and
fittings, or mean radial distance between the top of ribs or corrugation and the inside surface of the wall
for Type B pipes and fittings
3.2.10
ring flexibility
ability of a pipe to resist diametric deflection without the loss of structural integrity
3.2.11
pipe stiffness
mechanical characteristic of a pipe, which is a measure of the resistance to diametric (ring) deflection
under an external force as determined in accordance with EN ISO 9969
3.2.12
fitting stiffness
mechanical characteristic of a fitting which is a measure of the resistance to diametric (ring) deflection
under an external force as determined in accordance with EN ISO 13967
3.2.13
ring stiffness class
SN
numerical designation of the ring stiffness of the pipe or fitting which is a convenient round number,
relative to the determined stiffness in kiloNewtons per square meters (kN/m ), indicating the minimum
required ring stiffness of the pipe or stiffness of the fitting
3.2.14
drain
pipeline, usually underground, designed to carry wastewater fro
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