oSIST prEN 1852-1:2026

• Abstract:

  This part of EN 1852 specifies definitions and requirements for solid wall pipes with smooth internal and external surfaces extruded from the same compound throughout the wall, fittings and the system of polypropylene (PP) piping systems in the field of non-pressure underground drains and sewers for 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:; — solid wall pipes and fittings which are intended to be used buried underground outside the building structure reflected in the marking of the products by "U", and; — solid wall pipes and fittings which are intended to be used buried underground both outside (application area code “U”) and within the building structure reflected in the marking of products by "UD".; This document specifies the test parameters for the test methods referred to in this document.; NOTE 2 Multilayer pipes with different compounds throughout the wall are covered by EN 13476 2 [1] (see also CEN ISO/TR 27165 [2]).; NOTE 3 Plastics piping systems made of PP with mineral modifiers (PP-MD) are covered by EN 14758-1 [3].; This document covers a range of nominal sizes, and pipe series and gives recommendations concerning colours.; NOTE 4 It is the responsibility of the purchaser or specifier to make the appropriate selection from these aspects, taking into account their particular requirements and any relevant national regulations and installation practices or codes.; This document is applicable to PP pipes and fittings, their joints and to joints with components of other plastics and non-plastics materials intended to be used for buried piping systems for non-pressure underground drains and sewers.; Fittings can be manufactured by injection-moulding or be fabricated from pipes, fittings and/or mouldings.; NOTE 5 Pipes, fittings and other components conforming to any of the plastics product standards listed in Annex C can be connected to pipes and fittings conforming to this document, when they conform to the requirements for joint dimensions given in Clause 6 and to the requirements of Table 14.

• Status: Not Published
• Public Enquiry End Date: 14-Sep-2026
• ICS: 23.040.05 - Pipeline and its parts for external sewage systems
• ICS: 93.030 - External sewage systems
• Technical Committee: PCV - Plastic pipes, fittings and valves
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 15-Jul-2026
• Due Date: 02-Dec-2026
• Ref Project: prEN 1852-1 - Plastics piping systems for non-pressure underground drains and sewers - Polypropylene (PP) - Part 1: Specifications for pipes, fittings and the system

• Revises: SIST EN 1852-1:2018+A1:2022 - Plastics piping systems for non-pressure underground drainage and sewerage - Polypropylene (PP) - Part 1: Specifications for pipes, fittings and the system
• Effective Date: 07-Jan-2026

SLOVENSKI STANDARD
01-september-2026
Cevni sistemi iz polimernih materialov za odpadno vodo in kanalizacijo, ki delujejo
po težnostnem principu in so položeni v zemljo - Polipropilen (PP) - 1. del:
Specifikacije za cevi, fitinge in sistem
Plastics piping systems for non-pressure underground drains and sewers -
Polypropylene (PP) - Part 1: Specifications for pipes, fittings and the system
Kunststoff-Rohrleitungssysteme für erdverlegte drucklose Abwasserkanäle und -
leitungen - Polypropylen (PP) - Teil 1: Anforderungen an Rohre, Formstücke und das
Rohrleitungssystem
Systèmes de canalisations en plastique pour les branchements et les collecteurs
d'assainissement enterrés sans pression - Polypropylène (PP) - Partie 1 : Spécifications
pour tubes, raccords et le système
Ta slovenski standard je istoveten z: prEN 1852-1
ICS:
23.040.05 Cevovodi za zunanje Pipeline and its parts for
sisteme za odpadno vodo in external sewage systems
njihovi deli
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2026
ICS 23.040.05 Will supersede EN 1852-1:2018+A1:2022
English Version
Plastics piping systems for non-pressure underground
drains and sewers - Polypropylene (PP) - Part 1:
Specifications for pipes, fittings and the system
Systèmes de canalisations en plastique pour les Kunststoff-Rohrleitungssysteme für erdverlegte
branchements et les collecteurs d'assainissement drucklose Abwasserkanäle und -leitungen -
enterrés sans pression - Polypropylène (PP) - Partie 1 : Polypropylen (PP) - Teil 1: Anforderungen an Rohre,
Spécifications pour tubes, raccords et le système Formstücke und das Rohrleitungssystem
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 155.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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.
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.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1852-1:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 7
4 Symbols and abbreviations . 11
4.1 Symbols . 11
4.2 Abbreviations . 11
5 Material . 12
5.1 General . 12
5.2 Compound characteristics for pipe and fitting . 12
5.3 Melt mass-flow rate classification . 13
5.4 Thermal stability (OIT) . 14
5.5 Sealing ring retaining means . 14
6 General characteristics . 14
6.1 Appearance . 14
6.2 Colour . 14
7 Geometrical characteristics . 14
7.1 General . 14
7.2 Dimensions of pipes . 14
7.2.1 Outside diameters . 14
7.2.2 Outside diameters with close tolerances (CT) . 15
7.2.3 Length of pipes . 16
7.2.4 Chamfering . 17
7.2.5 Wall thicknesses . 17
7.3 Dimensions of fittings . 18
7.3.1 Outside diameters . 18
7.3.2 Design lengths (Z) . 18
7.3.3 Wall thicknesses . 19
7.3.4 Chamfering . 20
7.4 Dimensions of sockets and spigots . 20
7.4.1 Diameters and lengths of elastomeric ring seal sockets and spigots . 20
7.4.2 Wall thicknesses of sockets . 23
7.5 Types of fittings . 24
8 Mechanical characteristics . 28
8.1 Mechanical characteristics of pipes. 28
8.1.1 General requirements . 28
8.1.2 Additional mechanical requirements . 30
8.2 Mechanical characteristics of fittings . 30
8.2.1 Nominal ring stiffness class . 30
8.2.2 Additional requirements . 30
9 Physical characteristics . 31
9.1 Physical characteristics of pipes. 31
9.2 Physical characteristics of fittings . 32
10 Performance requirements . 33
11 Sealing rings . 34
12 Marking . 34
12.1 General . 34
12.2 Minimum required marking of pipes . 34
12.3 Minimum required marking of fittings . 35
12.4 Additional marking . 36
Annex A (normative) Utilization of PP recyclate . 37
A.1 General . 37
A.2 Agreed specification . 37
A.3 Additional specifications for recyclate and agreed specification . 38
Annex B (informative) General characteristics of PP pipes and fittings . 39
B.1 General . 39
B.2 Material characteristics . 39
B.3 Ring stiffness . 39
B.4 Chemical resistance . 39
B.5 Abrasion resistance . 40
B.6 Hydraulic roughness . 40
B.7 Diametric deflection . 40
Annex C (informative) Product standards of components that can be connected to
components conforming to this standard . 41
Bibliography . 42
European foreword
This document (prEN 1852-1:2026) has been prepared by Technical Committee CEN/TC 155 “Plastics
piping systems and ducting systems”, the secretariat of which is held by NEN.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN not be held responsible for identifying any or all such patent rights.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1852-1:2018+A1:2022.
Compared to EN 1852-1:2018+A1:2022, the main changes introduced into prEN 1852-1:2026 are listed
below:
a) updating of the terms and definitions in line with EN 14541-1;
b) “drainage and sewerage” changed into “drains and sewers” through the document;
c) updated material clauses and annexes for the use of recyclates.
The System Standards are based on the results of the work 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).
The System Standards 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 1852 consists of the following parts, under the general title Plastics piping systems for non-pressure
underground drainage and sewerage − Polypropylene (PP):
— Part 1: Specifications for pipes, fittings and the system (the present standard)
— Part 2: Guidance for the assessment of conformity (CEN Technical Specification)
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.
For guidance for installation, see CEN/TS 1046, and for guidance for structural design, see
CEN/TS 15223:2025 [15].
1 Scope
This part of EN 1852 specifies definitions and requirements for solid wall pipes with smooth internal and
external surfaces extruded from the same compound throughout the wall, fittings and the system of
polypropylene (PP) piping systems in the field of non-pressure underground drains and sewers for
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:
— solid wall pipes and fittings which are intended to be used buried underground outside the building
structure reflected in the marking of the products by "U", and
— solid wall pipes and fittings which are intended to be used buried underground both outside
(application area code “U”) and within the building structure reflected in the marking of products by
"UD".
This document specifies the test parameters for the test methods referred to in this document.
NOTE 2 Multilayer pipes with different compounds throughout the wall are covered by EN 13476-2 [1] (see also
CEN ISO/TR 27165 [2]).
NOTE 3 Plastics piping systems made of PP with mineral modifiers (PP-MD) are covered by EN 14758-1 [3].
This document covers a range of nominal sizes, and pipe series and gives recommendations concerning
colours.
NOTE 4 It is the responsibility of the purchaser or specifier to make the appropriate selection from these aspects,
taking into account their particular requirements and any relevant national regulations and installation practices
or codes.
This document is applicable to PP pipes and fittings, their joints and to joints with components of other
plastics and non-plastics materials intended to be used for buried piping systems for non-pressure
underground drains and sewers.
Fittings can be manufactured by injection-moulding or be fabricated from pipes, fittings and/or
mouldings.
NOTE 5 Pipes, fittings and other components conforming to any of the plastics product standards listed in
Annex C can be connected to pipes and fittings conforming to this document, when they conform to the
requirements for joint dimensions given in Clause 6 and to the requirements of Table 14.

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.
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 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 1133-1, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate
(MVR) of thermoplastics — Part 1: Standard method (ISO 1133-1)
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 3451-1, Plastics — Determination of ash — Part 1: General methods (ISO 3451-1)
EN ISO 9969:2016, Thermoplastics pipes — Determination of ring stiffness (ISO 9969:2016)
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 13254, Thermoplastics piping systems for non-pressure applications — Test method for
watertightness (ISO 13254)
EN ISO 13257, Thermoplastics piping systems for non-pressure applications — Test method for resistance
to elevated temperature cycling (ISO 13257)
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 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)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 472, EN ISO 1043-1 and the
following apply.
3.1
drain
pipeline, usually underground, designed to carry wastewater from a source to a sewer
[SOURCE: EN 16323:2014, 2.2.3.1]
3.2
sewer
pipeline, usually underground, designed to carry wastewater from more than one source
[SOURCE: EN 16323:2014, 2.2.3.12, modified - or other construction deleted]
3.3
wastewater
water composed of any combination of water discharged from domestic, industrial or commercial
premises, surface run-off and accidentally any sewer infiltration water
[SOURCE: EN 16323:2014, 2.3.10.65, modified - sewage (deprecated) deleted]
3.4
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
[SOURCE: EN 16323:2014, 2.1.1.3]
3.5
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 the
fittings are buried in ground and are connected to the soil and waste discharge system of the building
3.6
Geometrical definitions
3.6.1
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).
3.6.2
nominal size
DN/OD
nominal size, related to the outside diameter
3.6.3
nominal outside diameter
d
n
specified outside diameter, assigned to a nominal size DN/OD
Note 1 to entry: Nominal size is expressed in millimetres (mm).
3.6.4
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 next greater 0,1 mm
3.6.5
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), rounded to the next greater 0,1 mm
3.6.6
mean inside diameter of a socket
d
sm
arithmetical mean of a number of measurements of the inside diameter of a socket in the same cross
section
3.6.7
wall thickness
e
value of the measurement of the wall thickness at any point around the circumference of a component
3.6.8
mean wall thickness
e
m
arithmetical mean of a number of measurements of the wall thickness, regularly spaced around the
circumference and in the same cross section of a component, including the measured minimum and the
measured maximum values of the wall thickness in that cross section
3.6.9
pipes series
S
number for pipe designation (see ISO 4065)
Note 1 to entry: It is a dimensionless number.
3.6.10
standard dimension ratio
SDR
numerical designation of a pipe series, which is a convenient round number approximately equal to the
ratio of the nominal outside diameter, d , and the minimum wall thickness, e
n min
3.6.11
solid wall pipe
pipe with smooth internal and external surface with same compound/formulation throughout the wall
3.7
Mechanical definitions
3.7.1
nominal ring stiffness class
SN
numerical designation of the ring stiffness of a pipe or fitting, which is a convenient round number,
indicating the minimum required ring stiffness of the pipe or stiffness of the fitting
3.8
Material definitions
3.8.1
virgin material
plastics material in the form of pellets, granules, powder, floc, etc. that has not been subjected to use or
processing other than that required for its initial manufacture
Note 1 to entry: Does not contain any reworked plastics material and/or plastics recyclate.
Note 2 to entry: Sometimes also referred to as “primary material” or “primary plastics feedstock”.
Note 3 to entry: It is understood that the addition of additives such as stabilizers and pigments is still resulting
into a virgin (plastics) material.
[SOURCE: EN 14541-1:2022 [16] ]
3.8.2
reworked material
plastics material from rejected unused products or trimmings capable of being reclaimed within the same
process that generated it
Note 1 to entry: Reworked material does not change the status of the feedstock.
Note 2 to entry: This definition does not cover the conditions for the use of reworked material-which can be
found in the applicable product standard
Note 3 to entry: Previously referred to as “own reprocessed material”.
[SOURCE: EN 14541-1:2022 [16] ]
3.8.3
recyclate
plastics material resulting from the recycling of pre-consumer and post-consumer plastics products
Note 1 to entry: Also referred to as “secondary raw material” or “recycled plastics” or “regenerate”.
Note 2 to entry: Recycling can be chemical, physical or mechanical.
[SOURCE: EN 14541-1:2022 [16] ]
3.8.4
pre-consumer material
plastics material diverted from the waste stream during a manufacturing process, excluding reworked
(plastics) material
Note 1 to entry: Previously referred to as “post-industrial material”.
Note 2 to entry: Different categories of pre-consumer material may be considered in the applicable product
standard.
[SOURCE: EN 14541-1:2022 [16] ]
3.8.5
post-consumer material
plastics material generated by households or by commercial, industrial and institutional facilities in their
role as end-users of the product which can no longer be used for its intended purpose
Note 1 to entry: This includes returns of material from the distribution chain.
Note 2 to entry: Different categories of post-consumer material may be considered in the applicable product
standard.
[SOURCE: EN 14541-1:2022 [16] ]
3.8.6
compound
clearly defined homogenous mixture of substances used for the manufacture of the product
Note 1 to entry: In general, the term “compound” is used for polyolefins and the term “formulation” for PVC.
Note 2 to entry: For metals and when dealing with water and food contact regulations the term “composition” is
often used instead of compound/formulation.
[SOURCE: EN 14541-1:2022 [16] ]
3.8.7
agreed specification
specification of the relevant material characteristics agreed between the supplier of the recyclate and the
pipe and/or fitting manufacturer
Note 1 to entry: The agreed specification is often considered in the context of certification by a third party
organization.
3.8.8
fabricated fitting
fitting produced by welding, thermoforming or adhesive joints from pipes and/or from injection moulded
or rotomoulded fittings
4 Symbols and abbreviations
4.1 Symbols
For the purposes of this document, the following symbols apply.
A length of engagement
C depth of sealing zone
d outside diameter
e
d mean outside diameter
em
d nominal outside diameter
n
d mean inside diameter of a socket
sm
e wall thickness
e mean wall thickness
m
e wall thickness of a socket
e wall thickness in the groove area
l effective length of a pipe
L length of spigot
M length of spigot of a plug
R radius of swept fittings
Z design length of (a part of) a fitting
α nominal angle of a fitting
4.2 Abbreviations
For the purposes of this document, the following abbreviations apply.
CT close tolerance
DN nominal size
DN/OD nominal size, outside diameter related
MFR melt mass-flow rate
OIT oxidation induction time
PP polypropylene
S pipes series
SDR standard dimension ratio
SN nominal ring stiffness
TIR true impact rate
5 Material
5.1 General
The compound for production of pipes and fittings shall be PP-base material to which additives can be
added to enable conformity with the requirements of this document.
PP material may be virgin material, reworked material or recyclates.
Due to the use of additives and reworked material or recyclates, which both can contain minerals, the
maximum content of minerals in the final compound shall be ≤ 3,0 % by mass.
The content of the minerals (Ash residue) shall be tested in accordance with EN ISO 3451-1.
Recyclates are permitted if they comply with Annex A.
The minimum and maximum amounts of recyclate in the compound shall be specified by the
manufacturer and the conformity with all the requirements of this document shall be demonstrated by
testing the product:
— with no or minimum recyclate content, and
— with maximum recyclate content.
NOTE 1 Compounds with recyclate content between minimum and maximum are deemed to comply as well.
The quantity of recyclates that is added in each production batch shall be recorded by the manufacturer.
NOTE 2 The total recyclate content in the compound is the sum of the recyclate added and the recyclate present
in reworked material.
NOTE 3 Additional information on general characteristics of PP pipes and fittings is given in Annex B.
5.2 Compound characteristics for pipe and fitting
When tested in accordance with the test methods as specified in Table 1 using the indicated parameters,
the compound shall have characteristics conforming to the requirements given in Table 1.
Table 1 — Characteristics of PP compound for pipes and injection-moulded fittings
Characteristic Requirements Test parameters Test method
Resistance to No failure End caps Type A or type B EN ISO 1167–1
internal during the test
EN ISO 1167-2
pressure period
Test temperature 80 °C
Orientation free
Number of test 3
pieces
Circumferential 4,2 MPa
(hoop) stress
Conditioning period 1 h
Type of test Water-in-water
Test period 140 h
End caps Types A or B
Test temperature 95 °C
Orientation free
Number of test 3
pieces
Circumferential 2,5 MPa
(hoop) stress
Conditioning period 1 h
Type of test Water-in-water
Test period 1 000 h
5.3 Melt mass-flow rate classification
The MFR of the base material shall be tested in accordance with EN ISO 1133-1, using the test parameters:
temperature 230 °C and loading mass 2,16 kg.
Pipes and fittings shall be made from materials with an MFR as follows:
MFR (230/2,16) ≤ 1,5 g/10 min.
Materials for pipes and fittings for butt fusion joints shall be designated by the following classes with
regard to the MFR:
Class A: MFR ≤ 0,3 g/10 min;
Class B: 0,3 g/10 min < MFR ≤ 0,6 g/10 min;
Class C: 0,6 g/10 min < MFR ≤ 0,9 g/10 min;
Class D: 0,9 g/10 min < MFR ≤ 1,5 g/10 min.
Only pipes and fittings made from materials of the same or an adjacent MFR class may be fused together.
5.4 Thermal stability (OIT)
The test shall be carried out in accordance with EN ISO 11357-6 using a test temperature of 200 °C in
oxygen. The oxidation induction time of the material shall not be less than 8 min.
5.5 Sealing ring retaining means
Sealing rings may be retained using means made from polymers other than PP.
6 General characteristics
6.1 Appearance
When viewed without magnification, the following requirements apply:
— the internal and external surfaces of pipes and fittings shall be smooth, clean and free from defects
likely to prevent their conformity to this document. The manufacturer shall define acceptance
criteria for visual appearance;
NOTE Examples of defects can be grooving, blistering, impurities or pores.
— pipe ends shall be cleanly cut and the ends of pipes and fittings shall be square to their axis.
6.2 Colour
The pipes and fittings shall be coloured through the wall.
1)
The colour should preferably be black, orange-brown (approximately RAL 8023 or dusty grey
1)
(approximately RAL 7037 ).
7 Geometrical characteristics
7.1 General
Dimensions shall be measured in accordance with EN ISO 3126.
NOTE All figures in this document are schematic sketches only, to indicate the relevant dimensions. They do
not necessarily represent the manufactured components.
7.2 Dimensions of pipes
7.2.1 Outside diameters
The mean outside diameter, d , shall conform to Table 2 or Table 3, as applicable.
em
1)
See colour register RAL 840-HR [4].
Table 2 — Mean outside diameters
Dimensions in millimetres
Nominal outside Mean outside diameter
Nominal size
diameter
DN/OD
d d d
n em,min em,max
110 110 110,0 110,4
125 125 125,0 125,4
160 160 160,0 160,5
200 200 200,0 200,6
250 250 250,0 250,8
315 315 315,0 316,0
355 355 355,0 358,2
400 400 400,0 403,6
450 450 450,0 454,1
500 500 500,0 504,5
560 560 560,0 565,0
630 630 630,0 635,7
710 710 710,0 716,4
800 800 800,0 807,2
1 000 1 000 1 000,0 1 009,0
1 200 1 200 1 200,0 1 210,0
1 400 1 400 1 400,0 1 410,0
1 600 1 600 1 600,0 1 610,0
NOTE The tolerances for mean outside diameters up to and including 315 mm conform to
ISO 11922–1:1997 [5], grade C and the tolerances for mean outside diameters greater than
315 mm conform to ISO 11922–1:1997 [5], grade A.

7.2.2 Outside diameters with close tolerances (CT)
For the purposes of this standard in addition to the dimensions and tolerances given in Table 2 for spigot
ends of pipes and fittings, tolerances which are in accordance with EN 1401-1 [6] may be used.
If these tolerances, classified as close tolerance (CT), are required, the mean outside diameter, d , and
em
the tolerances shall conform to Table 3.
Table 3 — Mean outside diameters with close tolerances type CT
Dimensions in millimetres
Nominal outside Mean outside diameter
Nominal size
diameter
DN/OD
d d d
n em,min em,max
200 200 200,0 200,5
250 250 250,0 250,5
315 315 315,0 315,6
355 355 355,0 355,7
400 400 400,0 400,7
450 450 450,0 450,8
500 500 500,0 500,9
560 560 560,0 561,0
630 630 630,0 631,1
710 710 710,0 711,2
800 800 800,0 801,3
1000 1000 1 000,0 1 001,6
NOTE Spigot ends of pipes and fittings with maximum mean outside diameters conforming to
Table 3 can be used with pipes and fittings conforming to EN 1401–1 [6] provided that the
socket(s) for these pipes and fittings are intended to be used for elastomeric ring seal joints.

7.2.3 Length of pipes
The effective length of a pipe, l, shall be not less than that declared by the manufacturer when measured
as shown in Figure 1.
Figure 1 — Effective length of pipes
7.2.4 Chamfering
If a chamfer is applied, the angle of chamfering shall be between 15° and 45° to the axis of the pipe.
The remaining wall thickness of the end of the pipe shall be at least 1∕3 of e .
min
7.2.5 Wall thicknesses
The wall thickness, e, shall conform to Table 4, where the maximum wall thickness at any point of
1,25 e is permitted provided that the mean wall thickness, e , is less than or equal to the specified
min m
e .
m,max
Table 4 — Wall thicknesses
Dimensions in millimetres
a b
Wall thickness
SN 2 SN 4 SN 8 SN 16
Nominal
Nominal
outside
c S11,2
size S 16 S14 S 12,5 S10,5
S 20
diameter
DN/OD
d
n
SDR 41 SDR 33 SDR 29 SDR 26 SDR23,4 SDR22
e e e e e e e e e e e e
min m,max min m,max min m,max min m,max min m,max min m,max
110 110 − − 3,4 4,0 3,8 4,4 4,2 4,9 4,7 5,4 5,0 5,7
125 125 − − 3,9 4,5 4,3 5,0 4,8 5,5 5,4 6,2 5,7 6,5
160 160 − − 4,9 5,6 5,5 6,3 6,2 7,1 6,9 7,8 7,3 8,3
200 200 − − 6,2 7,1 6,9 7,8 7,7 8,7 8,6 9,7 9,1 10,3
250 250 6,2 7,1 7,7 8,7 8,6 9,7 9,6 10,8 10,7 12,0 11,4 12,8
315 315 7,7 8,7 9,7 10,9 10,8 12,1 12,1 13,6 13,5 15,1 14,4 16,1
355 355 8,7 9,8 10,9 12,2 12,2 13,7 13,6 15,2 15,2 17,0 16,2 18,1
400 400 9,8 11,0 12,3 13,8 13,7 15,3 15,3 17,1 17,1 19,1 18,2 20,3
450 450 11,0 12,3 13,8 15,4 15,4 17,2 17,2 19,2 19,2 21,4 20,5 22,8
500 500 12,3 13,8 15,3 17,1 17,1 19,1 19,1 21,3 21,4 23,6 22,8 25,3
560 560 13,7 15,3 17,2 18,2 19,2 21,4 21,4 23,8 23,9 26,5 25,5 28,3
630 630 15,4 17,2 19,3 21,5 21,6 24,0 24,1 26,8 26,9 29,8 28,7 31,8
710 710 17,4 19,4 21,8 24,2 24,3 27,0 27,2 30,2 30,3 33,6 32,3 35,8
800 800 19,6 21,8 24,5 27,2 27,4 30,4 30,6 33,9 34,2 37,9 36,4 40,3
1 000 1 000 24,5 27,2 30,6 33,9 34,2 37,9 38,2 42,3 42,7 47,2 45,5 50,3
1 200 1 200 29,4 32,6 36,7 40,6 41,1 45,5 45,9 50,7 51,2 56,5 54,6 60,3
1 400 1 400 34,3 38,0 42,9 47,4 47,9 52,9 53,5 59,1 59,8 66,0 63,7 70,3
1 600 1 600 39,2 43,4 49,0 54,1 54,7 60,4 61,2 67,5 68,3 75,3 72,7 80,2
a
The e values are accordance with ISO 4065.
min
b
The tolerances for wall thickness conform to ISO 11922–1 [5], Grade W.
c
S 20 is applicable for application area code “U” only.

7.3 Dimensions of fittings
7.3.1 Outside diameters
The mean outside diameter, d , of the spigot shall conform to Table 2 or Table 3 as applicable.
em
7.3.2 Design lengths (Z)
The design lengths, Z, shall be declared by the manufacturer.
NOTE The design lengths (see the dimensions Z in Figures 7 to 11 and Figures 14 to 19) are intended to assist
in the design of moulds and are not intended to be used for quality control purposes. ISO 265-1:1988 [5] can be
used as a guideline.
7.3.3 Wall thicknesses
The minimum wall thickness e of the body or the spigot of a fitting shall conform to Table 5, except
min
that a reduction of 5 % resulting from core shifting is permitted. In such a case, the average of two
opposite wall thicknesses shall be equal to or exceed the values given in Table 5.
Where a fitting or adaptor provides for a transition between two nominal sizes, the wall thickness of each
connecting part shall conform to the requirements for the applicable nominal size. In such a case, the wall
thickness of the fitting body is permitted to change gradually from the one wall thickness to the other.
The wall thickness of fabricated fittings, except for spigot and socket, may be changed locally by the
fabrication process, providing that the minimum wall thickness of the body conforms to e , as given in
min
Table 4 or Table 5 as appropriate for the pipe series concerned.
Table 5 — Wall thicknesses
Dimensions in millimetres
Nominal size Nominal a
Minimum wall thickness, e
min
DN/OD outside
diameter, d SN 2 SN 8
n SN 4
b c
S 20 S 16,0 S 13,3
SDR 41 SDR 33 SDR 27,6
110 110 ― 3,4 4,0
125 125 ― 3,9 4,6
160 160 ― 4,9 5,8
200 200 ― 6,2 7,3
250 250 6,2 7,7 9,1
315 315 7,7 9,7 11,4
355 355 8,7 10,9 12,9
400 400 9,8 12,3 14,5
450 450 11,0 13,8 16,3
500 500 12,3 15,3 18,1
560 560 13,7 17,2 20,3
630 630 15,4 19,3 22,8
710 710 17,4 21,8 25,7
800 800 19,6 24,5 29,0
1 000 1000 24,5 30,6 36,2
1 200 1200 29,4 36,7 43,4
1 400 1400 34,3 42,9 50,6
1 600 1600 39,2 49,0 57,9
a
The e values are in accordance with ISO 4065.
min
b
S 20 is applicable for application area code “U” only.
c
S13,3 is an existing series for injection moulding fittings. S12,5 is also
applicable.
7.3.4 Chamfering
If a chamfer is applied, the angle of chamfering shall between 15° and 45° to the axis of the spigot end of
the fitting. The remaining wall thickness of the end of the fitting shall be at least 1/3 of e .
min
7.4 Dimensions of sockets and spigots
7.4.1 Diameters and lengths of elastomeric ring seal sockets and spigots
The diameters and lengths of elastomeric ring seal sockets and lengths of spigots shall conform to Table 6
(see Figures 2, 3, 4 or 5, as applicable).
Where sealing rings are firmly retained, the dimensions for the minimum value for A and the maximum
value for C shall be measured to the effective sealing point (see Figure 5) as specified by the manufacturer.
This point shall give a full sealing action.
Different designs of elastomeric ring seal sockets and spigots are permitted, provided the joints conform
to the requirements given in Table 14.
Table 6 — Socket diameters and lengths of sockets and spigot
Dimensions in millimetres
Nominal size Nominal outside Minimum mean inside a Spigot
Socket
DN/OD diameter diameter of the socket
d b A C L
n d min max 1,min
sm,min
110 110 110,4 40 22 62
125 125 125,4 43 26 68
160 160 160,5 50 32 82
200 200 200,6 58 40 98
250 250 250,9 68 c 118
315 315 316,1 81 c 144
355 355 358,3 89 c 160
400 400 403,7 98 c 178
450 450 454,2 108 c 198
500 500 504,6 118 c 218
560 560 565,7 130 c 242
630 630 635,8 144 c 270
a
The socket is designed for an effective length of pipe of 6 m.
b
For nominal sizes DN/OD ≤ 200, d conforms to EN 1401–1 [6].
sm,min
c
Higher values for C are allowed for dimensions ≥ DN/OD 250. In that case the manufacturer shall state
in his documentation the actual required L according to the equation L = A + C.
1,min 1,min min
For sockets which have a nominal outside diameter greater than 630 mm, the values of d , A
sm,min min
and C shall be calculated using the following formulae:
max
d = 1,009 2 d (1)
sm,min n
A = (0,2 d + 18) mm (2)
min n
C = 0,2 d (3)
max n
For pipe lengths longer than 6 m the length of engagement A in the socket shall be calculated from the
equation: A = (0,2 d + 3 l) mm, where l is the pipe length in metres.
n
Figure 2 — Spigot length
Key
A length of engagement e wall thickness of a socket
C depth of sealing zone e wall thickness at the groove
de outside diameter L1 length of a spigot
ds inside diameter of a socket
e wall thickness
Figure 3 — General dimensions of sockets and spigot ends with elastomeric sealing joints

Figure 4 — Typical groove designs for elastomer
...