ISO 12051:2026

International
Standard
ISO 12051
First edition
Plastics piping systems for water
2026-09
supply and drainage and sewerage
under pressure — Modified
poly(vinyl chloride)(PVC-M) pipe
Systèmes de canalisations en plastique pour l'alimentation en
eau et pour les branchements et collecteurs d'assainissement sous
pression — Tube en poly(chlorure de vinyle) modifié (PVC-M)
Reference number
© ISO 2026
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Published in Switzerland
ii
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 2
3.1 Terms and definition .2
3.1.1 Terms related to geometrical definitions.3
3.1.2 Terms related to material . .4
3.1.3 Terms related to material characteristics .5
3.1.4 Terms related to service conditions .5
3.2 Symbols .6
3.3 Abbreviated terms .8
4 Material. 8
4.1 General .8
4.2 General requirements for compounds or formulations .8
4.3 Special requirement for compounds or formulations for components in contact with
drinking water .8
4.4 Use of reworked material and recyclate material .9
4.5 Density .9
4.6 Classification and verification of materials .9
4.6.1 Classification of compounds or formulations in pipe form .9
4.6.2 Verification of compounds or formulations in pipe form of PVC-M 250 .9
5 General characteristics . 9
5.1 Appearance .9
5.2 Colour .10
5.3 Opacity of pipes intended for the above-ground conveyance of water .10
6 Geometrical characteristics . 10
6.1 Measurement of dimensions .10
6.2 Nominal outside diameters .10
6.3 Mean outside diameters and their tolerances .10
6.4 Wall thickness and their tolerances .11
6.5 Length of pipe . 13
6.6 Pipes with sockets .14
6.6.1 Sockets for solvent cementing .14
6.6.2 Sockets for elastomeric ring seal type joints . 15
6.6.3 Minimum depth of engagement of sockets .16
6.6.4 Calculation of depth of engagement .16
6.7 Pipe ends for ring seal or solvent cement joints .19
7 Classification and selection of pipes . 19
7.1 Classification .19
7.2 Selection of nominal pressure and pipe series S for water up to and including 25 °C .19
7.3 Determination of the allowable operating pressure for water up to 45 °C .19
8 Mechanical characteristics .20
8.1 Resistance to high velocity impact . 20
8.2 Resistance to internal pressure . 20
8.3 Ring stiffness .21
8.4 C-Ring toughness test .21
8.5 Long-term toughness .21
8.6 Resistance of notched pipe to internal pressure.21
9 Physical characteristics .21
10 Sealing rings .22

iii
11 Adhesives .22
12 Performance requirements . .23
13 Marking . .23
13.1 General . 23
13.2 Minimum required marking . . 23
13.3 Additional marking. 23
Annex A (normative) Allowable operating pressures .24
Annex B (normative) Resistance to high velocity impact fracture .26
Annex C (normative) Method for determination of C-ring toughness .29
Annex D (informative) Calculation of negative pressure capability of pipes .33
Annex E (normative) Method for determination of long-term toughness .34
Annex F (normative) Method for determining the resistance of notched pipe to internal
pressure .37
Bibliography .39

iv
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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.
This document was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the
transport of fluids, Subcommittee SC 2, Plastics pipes and fittings for water supplies.
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
Introduction
This document defines the requirements for modified poly(vinyl chloride) (PVC-M) pipes.
PVC-M pipe is similar in composition to unplasticized PVC (PVC-U) pipe except that an impact modifier has
been added to alter the fracture mechanism, so that the material behaves in a more predictable, ductile
manner. The combination of material formulation and processing conditions are such that the required
strength and ductility is achieved.
The more predictable, ductile fracture mechanism allows for reduced wall thickness with material and
energy savings. It also results in improved resistance to crack propagation.
Similar products have been specified in various national standards and have been referred to as PVC-A,
PVC-HI, PVC-CPE, PVC-EPR and HIVP. This product is different to the product specified in the ISO 6993 series
(PVC-HI).
vi
International Standard ISO 12051:2026(en)
Plastics piping systems for water supply and drainage and
sewerage under pressure — Modified poly(vinyl chloride)
(PVC-M) pipe
1 Scope
This document specifies requirements for pipe and integral joints of higher level of impact resistant PVC-M
for the conveyance of water and waste water under pressure. The pipes are intended for installation below
and above ground where they are not exposed to direct sunlight.
This document also specifies the test parameters for the test methods in this document.
This document is applicable to extruded PVC-M pipes without a socket and pipes with a socket (integral or
not), intended to be used for the following purposes:
a) water mains and services buried in the ground;
b) conveyance of water above ground for both outside and inside buildings;
c) buried and above-ground drainage and sewerage under pressure.
This document is applicable to piping systems intended for the supply of water under pressure up to and
including 25 °C (cold water) intended for human consumption and for general purposes as well as for waste
water under pressure.
This document specifies pipes for the conveyance of water and waste water up to and including 45 °C. For
temperatures between 25 °C and 45 °C, Figure A.1 applies.
NOTE 1 The producer and the end-user can come to agreement on the possibilities of use for temperatures above
45 °C on a case-by-case basis
This document specifies a range of pipe sizes and pressure classes, and gives requirements concerning
colours.
NOTE 2 It is the responsibility of the purchaser or specifier to make the appropriate selections concerning pipe
sizes, pressure classes and colours, taking into account their particular requirements and any relevant national
regulations and installation practices or codes.
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 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 1452-1, Plastics piping systems for water supply and for buried and above-ground drainage and sewerage
under pressure — Unplasticized poly(vinyl chloride) (PVC-U) — Part 1: General

ISO 1452-2, Plastics piping systems for water supply and for buried and above-ground drainage and sewerage
under pressure — Unplasticized poly(vinyl chloride) (PVC-U) — Part 2: Pipes
ISO 1452-5, Plastics piping systems for water supply and for buried and above-ground drainage and sewerage
under pressure — Unplasticized poly(vinyl chloride) (PVC-U) — Part 5: Fitness for purpose of the system
ISO 2505, Thermoplastics pipes — Longitudinal reversion — Test method and parameters
ISO 2507, Thermoplastics pipes and fittings — Vicat softening temperature — General test method and test
conditions for vinyl chloride-based (PVC-U, PVC-C, PVC-HI) and acrylonitrile-based (ABS, ASA) pipes and fittings
ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 6259-1, Thermoplastics pipes — Determination of tensile properties — Part 1: General test method
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 7387-1, Adhesives with solvents for assembly of PVC-U pipe elements — Characterization — Part 1: Basic
test methods
ISO 7686, Plastics pipes and fittings — Determination of opacity
ISO 9080, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of
thermoplastics materials in pipe form by extrapolation
ISO 9311-1, Adhesives for thermoplastic piping systems — Part 1: Determination of film properties
ISO 9852, Unplasticized poly(vinyl chloride) (PVC-U) pipes — Dichloromethane resistance at specified
temperature (DCMT) — Test method
ISO 11673, Unplasticized poly(vinyl chloride) (PVC-U) pressure pipes — Determination of the fracture toughness
properties
ISO 12162, Thermoplastics materials for pipes and fittings for pressure applications — Classification, designation
and design coefficient
ISO 18373-1, Rigid PVC pipes — Differential scanning calorimetry (DSC) method — Part 1: Measurement of the
processing temperature
EN 681-1, Elastomeric seals — Materials requirements for pipe joint seals used in water and drainage
applications — Part 1: Vulcanized rubber
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definition
For the purposes of this document, the terms and definitions given in ISO 472, ISO 1452-1, ISO 1452-2 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/

3.1.1 Terms related to geometrical definitions
3.1.1.1
nominal size
DN
numerical designation of the size of a component, other than a component designated by thread size, which
is a convenient round number approximately equal to the manufacturing dimension in millimetres (mm)
3.1.1.2
nominal diameter
d
n
specified diameter assigned to a nominal size
Note 1 to entry: According to the ISO 1452 series, the nominal (outside) diameter of a thermoplastics pipe or a spigot is
equal to its minimum mean outside diameter, d .
em,min
Note 2 to entry: The nominal (inside) diameter of the socket of a fitting, pipe, valve or of ancillary equipment is equal
to the nominal (outside) diameter of the connecting pipe for which they are designed.
Note 3 to entry: The nominal diameter is expressed in millimetres (mm).
3.1.1.3
outside diameter at any point
d
e
value of the measurement of the outside diameter through its cross-section at any point of a pipe or spigot,
rounded up to the nearest 0,1 mm
3.1.1.4
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 up to the nearest 0,1 mm
3.1.1.5
mean inside diameter of socket
d
im
arithmetical mean of two measured inside diameters perpendicular to each other at the midpoint of the
socket length
3.1.1.6
out-of-roundness
ovality
difference between the measured maximum and the measured minimum outside diameter in the same cross-
section of a pipe or spigot, or the difference between the measured maximum and the measured minimum
inside diameter in the same cross-section of a socket
Note 1 to entry: The out-of-roundness tolerance on the outside diameters is applicable to pressure classes PN 10
and above. No such tolerance is placed on classes PN 8 and below because the thinner walled pipes can be easily re-
rounded when inserted into sockets.
3.1.1.7
nominal wall thickness
e
n
numerical designation of the wall thickness of a component which is identical to the minimum permissible
wall thickness at any point
Note 1 to entry: The wall thickness is expressed in millimetres (mm).
3.1.1.8
wall thickness at any point
e
value of the measurement of the wall thickness at any point around the circumference of a component

3.1.1.9
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
3.1.1.10
tolerance
permitted variation of the specified value of a quantity, expressed as the difference between the permitted
maximum and the permitted minimum value
3.1.1.11
pipe series
S
dimensionless number for pipe designation
Note 1 to entry: The pipe series S is related to a given pipe geometry as given in Formula (1):
de−
nn
S= (1)
2e
n
3.1.1.12
standard dimension ratio
SDR
numerical designation of pipe series which is a convenient round number approximately equal to the
dimension ratio of the nominal outside diameter, d , and the nominal wall thickness, e
n n
[4]
Note 1 to entry: According to ISO 4065, the standard dimension ratio, SDR, and the pipe series, S, are related as given
in Formula (2):
SDR21S (2)
3.1.2 Terms related to material
3.1.2.1
virgin material
plastics material in the form of pellets, granules, powder, flake, etc. that has not been subjected to use or
processing other than that required for its initial manufacture and to which no reworked or recyclate
material(s) has been added
3.1.2.2
own reworked material
material prepared from rejected unused pipes including trimmings from the production of pipes, which will
be reworked in a manufacturer's plant after having been previously processed by the same manufacturer
and for which the complete formulation or compound is known
3.1.2.3
recyclate
plastics material resulting from the recycling or reworking of material from any external source including
pre-consumer and post-consumer plastics products
3.1.2.4
resin
non-crystalline powder or pellets consisting of organic compound or organic derivatives or both
3.1.2.5
impact modifier
substance added into an unplasticized poly(vinyl chloride) (PVC-U) composition in order to alter the fracture
mechanism so that the material behaves in a more predictable and ductile manner

3.1.2.6
compound
polymer composition that is based on unplasticized poly(vinyl chloride) (PVC-U) resin and that further
incorporated only the modifiers and additives that are required for the manufacture of pipes and fittings
3.1.3 Terms related to material characteristics
3.1.3.1
lower prediction limit
σ
LPL
quantity which can be considered as a material property, representing the 97,5 % lower confidence limit of
the predicted long-term hydrostatic strength at 20 °C for 50 years with internal water pressure
Note 1 to entry: Lower prediction limit is expressed in megapascals (MPa).
3.1.3.2
minimum required strength
MRS
value of the lower prediction limit, σ , rounded to the next lower value of the R10 series when σ is below
LPL LPL
10 MPa, or to the next lower value of the R20 series when σ is 10 MPa or greater
LPL
Note 1 to entry: The R10 and R20 series are the basic series of preferred numbers conforming to ISO 3 and ISO 497.
3.1.3.3
design coefficient
C
overall coefficient with a value greater than 1, which takes into consideration service conditions as well as
properties of the components of a piping system other than those represented in the lower predictive limit
3.1.3.4
design stress
σ
s
allowable stress for a given application at 20 °C
Note 1 to entry: Design stress is derived from the minimum required strength, MRS, by dividing it by the coefficient,
C, using Formula (3):
MRS
  (3)
s
C
Note 2 to entry: Design stress is expressed in megapascals (MPa).
3.1.4 Terms related to service conditions
3.1.4.1
nominal pressure
PN
numerical designation used for reference purposes related to the mechanical characteristics of a component
of a piping system
Note 1 to entry: For plastics piping systems, nominal pressure corresponds to the allowable operating pressure, in bar
5 2
(1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm ), conveying water at 20 °C during 50 years, as given in Formula (4):
20MRS
PN  (4)
CSDR 1

Note 2 to entry: Research on long-term performance prediction of existing poly(vinyl chloride) (PVC) water
[8],[9]
distribution systems shows possible service life of at least 100 years .

3.1.4.2
allowable operating pressure
PFA
maximum hydrostatic pressure which a component is capable of withstanding continuously in service
(excluding surge)
Note 1 to entry: For water temperatures up to and including 25 °C: PFA = PN, where PN is the nominal pressure.
Note 2 to entry: For water temperatures above 25 °C: PFA = f × PN, where f is the derating factor depending on water
T T
temperature.
Note 3 to entry: In cases where a further derating factor for application is required: PFA = f × f × PN, where f is the
A T A
derating factor depending on the application.
3.1.4.3
allowable site test pressure
PEA
maximum hydrostatic pressure which a newly installed component is capable of withstanding for a relatively
short duration, in order to ensure the integrity and leaktightness of the pipeline
Note 1 to entry: For ISO 12051 or PEA equals PFA+5 bar whichever is the lowest (1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1
N/mm ).
3.1.4.4
hydrostatic stress
σ
stress induced in the wall of a pipe when a pressure is applied using water as a medium
Note 1 to entry: The hydrostatic stress is related to the applied pressure, p, in bar (1 bar = 0,1 MPa = 10 Pa; 1 MPa
= 1 N/mm ), the wall thickness at any point, e, and the mean outside diameter, d , of a pipe and is calculated using
em
Formula (5):
pd e

em
  (5)
20e
Note 2 to entry: Hydrostatic stress is expressed in megapascals (MPa).
3.2 Symbols
C design coefficient
d outside diameter at any point
e
d mean outside diameter
em
d outside diameter of the test piece
e,test
d inside diameter at any point
i
d mean inside diameter of socket
im
d nominal outside or inside diameter
n
e wall thickness at any point
e mean wall thickness
m
e nominal wall thickness
n
E Young’s modulus
E elastic modulus in the circumferential direction
c
f derating factor depending on the application
A
f derating factor depending on water temperature
T
3 3
I moment of inertia = e /12, in mm /m
n
l nominal pipe length
p
l length of socket
s
l length of socket entrance and sealing area
s,e/s
m depth of engagement
m minimum depth of engagement
min
m minimum depth of engagement due to angular deflection of the pipe
a,min
m minimum depth of engagement calculated
calc,min
m minimum depth of engagement due to the Poisson contraction
p,min
m minimum depth of engagement due to safety allowance
s,min
m minimum depth of engagement due to temperature contraction
T,min
S calculated initial ring stiffness
Ncalc
α
coefficient of linear expansion
ΔT temperature differential
p pressure
p unsupported critical buckling pressure
cr
δ material density
θ maximum angle of deflection of spigot within socket
μ Poisson ratio
ρ density
σ hydrostatic stress
σ net section stress
n
σ design stress
s
σ lower predicted limit
LPL
3.3 Abbreviated terms
DN nominal size
DN/ID nominal size, inside diameter related
DN/OD nominal size, outside diameter related
MRS minimum required strength
PFA allowable operating pressure
PEA allowable site test pressure
PN nominal pressure
PVC-U unplasticized poly(vinyl chloride)
PVC-HI high impact resistant poly(vinyl chloride)
PVC-M modified poly(vinyl chloride)
S pipe series
SDR standard dimension ratio
TIR true impact rate
4 Material
4.1 General
The pipes shall be made of modified PVC, to which only additives that are necessary for facilitating
conformity to this document are added. The material to be used shall conform to the requirements given in
4.2, 4.3 and 4.4.
4.2 General requirements for compounds or formulations
The material from which the pipes, fittings and valves are made shall be an unplasticized poly(vinyl chloride)
compound or formulation. This compound or formulation shall consist of PVC resin/powders compounded
with additives such as stabilizer, pigment and modifier, which will not have significantly adverse effect on
the weathering or mechanical properties of the material. The PVC content of the pipe shall be not less than
83 %.
None of these additives shall be used separately or together in quantities sufficient to constitute a toxic,
organoleptic or microbiological hazard, or to impair the fabrication or solvent cementing properties of the
product or to impair the chemical and physical or mechanical properties (in particular long-term mechanical
strength and impact strength) as specified in this document.
4.3 Special requirement for compounds or formulations for components in contact with
drinking water
All plastics and non-plastics materials for components of the PVC-M piping system (e.g. pipes, fittings, valves,
elastomeric sealing rings, solvent cement, lubricants), when in permanent or in temporary contact with
water that is intended for human consumption, shall not adversely affect the quality of the drinking water.

4.4 Use of reworked material and recyclate material
The use of the manufacturer's own reworked material obtained during the production and production
testing of products conforming to ISO 12051 is permitted in addition to the use of virgin material.
Reworked material obtained from external sources and recyclate material shall not be used.
4.5 Density
The density, ρ, at 23 °C of the pipe, when measured in accordance with ISO 1183-1, shall be within the
following limits:
3 3
1 350 kg/m ≤ ρ ≤ 1 460 kg/m
4.6 Classification and verification of materials
4.6.1 Classification of compounds or formulations in pipe form
Compounds or formulations shall be designated by the material type (PVC-M) and the level of minimum
required strength (MRS), in accordance with Table 1.
The MRS value for compound or formulation classification shall be derived from σ in accordance with
LPL
ISO 12162. The σ shall be determined by analysis, in accordance with ISO 9080, of hydrostatic pressure
LPL
tests carried out in accordance with ISO 1167-1 and ISO 1167-2 and using pipe series 6,3 ≤ S ≤ 12,5 and end
caps type A, tested with water in water. The test temperatures shall be 20 °C and 60 °C.
NOTE Analyses established according to previous editions of ISO 9080 are deemed to satisfy the requirements of
this subclause.
Table 1 — Material designation and corresponding maximum design stress values
a
Designation   Minimum re- σ of pipes
s
quired strength MRS
MPa
MPa
d ≤ 90 d > 90
n n
(C = 1,6) (C = 1,4)
PVC-M 250     25,0 15,6 17,8
a
The designation is only used for compound classification declared by the compound manufacturer.
4.6.2 Verification of compounds or formulations in pipe form of PVC-M 250
For the verification of materials with MRS ≥ 25 MPa, the originally established curve in accordance with
ISO 9080 shall be used accordingly.
5 General characteristics
5.1 Appearance
When viewed without magnification, the internal and external surfaces of pipes shall be smooth, clean and
free from scoring, cavities and other surface defects that would prevent conformity to this document. The
material shall not contain any impurities visible without magnification. The ends of the pipe shall be cut
cleanly and square to the axis of the pipe.

5.2 Colour
The colour of pipes shall be in accordance with the defined application, e.g. drinking water, pressurized
sewerage or drainage.
NOTE The colouring of pipes for the supply of water for human consumption can be governed by national
regulations.
5.3 Opacity of pipes intended for the above-ground conveyance of water
The wall of the pipe shall be opaque and shall not transmit more than 0,2 % of visible light when measured
in accordance with ISO 7686.
6 Geometrical characteristics
6.1 Measurement of dimensions
Dimensions shall be measured in accordance with ISO 3126.
6.2 Nominal outside diameters
The nominal outside diameter, d , of a pipe shall conform to Table 2.
n
6.3 Mean outside diameters and their tolerances
The mean outside diameter, d , of a pipe shall conform to the applicable nominal outside diameter, d ,
em n
within the tolerance given in Table 2.
The tolerance for out-of-roundness shall conform to Table 2.

Table 2 — Nominal outside diameters and tolerances
Dimensions in millimetres
b
Nominal outside Tolerance for mean out- Tolerance for out-of-roundness
a
diameter side diameter,d
em
c d
d x S 20 to S 16 S 12,5 to S 5
n
12 0,2 — 0,5
16 0,2 — 0,5
20 0,2 — 0,5
25 0,2 — 0,5
32 0,2 — 0,5
40 0,2 1,4 0,5
50 0,2 1,4 0,6
63 0,3 1,5 0,8
75 0,3 1,6 0,9
90 0,3 1,8 1,1
110 0,4 2,2 1,4
125 0,4 2,5 1,5
140 0,5 2,8 1,7
160 0,5 3,2 2,0
180 0,6 3,6 2,2
200 0,6 4,0 2,4
225 0,7 4,5 2,7
250 0,8 5,0 3,0
280 0,9 6,8 3,4
315 1,0 7,6 3,8
355 1,1 8,6 4,3
400 1,2 9,6 4,8
450 1,4 10,8 5,4
500 1,5 12,0 6,0
560 1,7 13,5 6,8
630 1,9 15,2 7,6
710 2,0 17,1 8,6
800 2,0 19,2 9,6
900 2,0 21,6 —
1 000 2,0 24,0 —
a
The tolerance conforms to grade D of ISO 11922-1 for d ≤ 50 and to grade C for d > 50. The tolerance is
n n
+x
expressed in the form mm, where x is the value of the tolerance.
b
The tolerance is expressed as the difference between the largest and the smallest outside diameter in a
cross-section of the pipe (i.e. d − d ).
e,max e,min
c
For d ≤ 250, the tolerance conforms to grade N of ISO 11922-1. For d > 250, the tolerance conforms to
n n
grade M of ISO 11922-1. The requirement for out-of-roundness is only applicable prior to storage.
d
For d of 12 to 1 000, the tolerance conforms to 0,5 grade M of ISO 11922-1. The requirement for out-of-
n
roundness is only applicable prior to the pipe leaving the manufacturer's premises.
6.4 Wall thickness and their tolerances
The nominal wall thickness, e , is classified with the pipe series, S. The nominal wall thickness corresponds
n
to the minimum allowable wall thickness.
The nominal wall thickness shall conform to Table 3, as appropriate to the pipe series.
The tolerance for wall thickness, e, shall conform to Table 4.

Table 3 — Nominal (minimum) wall thicknesses
Pipe series S
Nominal (minimum) wall thickness
Nominal
outside S 16 S 12,5 S 10 S 8 S 6,3 S 5
S 20
diameter,
(SDR 33) (SDR 26) (SDR 21) (SDR 17) (SDR 13,6) (SDR 11)
d
n
Nominal pressure PN based on design coefficientC = 1,6
PN 6 PN 8 PN 10 PN 12,5 PN 16 PN 20
12 — — — — — —
16 — — — — — —
20 — — — — — —
25 — — — — — —
32 — — — — — —
40 — — — — — 2,7
50 — — — — 2,7 3,4
63 — — — 2,6 3,4 4,3
75 — — 2,5 3,1 4,1 5,1
90 — — 3,0 3,8 4,9 6,2
a
Nominal pressure PN based on design coefficientC = 1,4
(SDR (SDR (SDR (SDR (SDR (SDR (SDR
57) 45) 35,5) 28,5) 22,25) 17,8) 14,25)
PN 6 PN 8 PN 10 PN 12,5 PN 16 PN 20 PN 25
110 — 2,5 3,2 4,0 5,2 6,5 8,3
125 — 2,8 3,6 4,5 5,9 7,4 9,4
140 — 3,2 4,1 5,1 6,6 8,3 10,6
160 2,8 3,6 4,6 5,8 7,5 9,5 12,1
180 3,1 4,1 5,2 6,5 8,5 10,7 13,6
200 3,4 4,5 5,8 7,3 9,4 11,9 15,1
225 3,9 5,1 6,5 8,2 10,6 13,4 —
250 4,3 5,7 7,2 9,1 11,8 14,9 —
280 4,8 6,4 8,1 10,2 13,2 16,7 —
315 5,4 7,2 9,1 11,5 14,8 18,8 —
355 6,1 8,1 10,3 12,9 16,7 21,1 —
400 6,9 9,1 11,6 14,5 18,8 23,8 —
450 7,8 10,2 13,0 16,4 21,2 26,8 —
500 8,6 11,4 14,5 18,2 23,5 29,8 —
560 9,7 12,7 16,2 20,4 — — —
630 10,9 14,3 18,3 22,9 — — —
710 12,2 16,1 20,6 — — — —
800 13,8 18,2 23,2 — — — —
900 15,5 20,5 — — — — —
1 000 17,2 22,7 — — — — —
a
To apply a design coefficient of 1,6 (instead of 1,4) for pipes with nominal diameters above 90 mm, the
next higher pressure rating, PN, shall be chosen.
NOTE 1 The nominal wall thicknesses conform to ISO 4065.
NOTE 2 The PN 6 values for S 20 and S 16 are calculated with the preferred number 6,3.

Table 4 — Tolerance on wall thicknesses at any point
Dimensions in millimetres
Nominal (minimum) Tolerance for wall Nominal (minimum) Tolerance for wall
thickness thickness
wall thickness wall thickness
x x
e e
n n
> ≤ > ≤
1,0 2,0 0,4 21,0 22,0 2,4
2,0 3,0 0,5 22,0 23,0 2,5
3,0 4,0 0,6 23,0 24,0 2,6
4,0 5,0 0,7 24,0 25,0 2,7
5,0 6,0 0,8 25,0 26,0 2,8
6,0 7,0 0,9 26,0 27,0 2,9
7,0 8,0 1,0 27,0 28,0 3,0
8,0 9,0 1,1 28,0 29,0 3,1
9,0 10,0 1,2 29,0 30,0 3,2
10,0 11,0 1,3 30,0 31,0 3,3
11,0 12,0 1,4 31,0 32,0 3,4
12,0 13,0 1,5 32,0 33,0 3,5
13,0 14,0 1,6 33,0 34,0 3,6
14,0 15,0 1,7 34,0 35,0 3,7
15,0 16,0 1,8 35,0 36,0 3,8
16,0 17,0 1,9 36,0 37,0 3,9
17,0 18,0 2,0 37,0 38,0 4,0
18,0 19,0 2,1
19,0 20,0 2,2
20,0 21,0 2,3
+x
NOTE 1 The tolerance applies to the nominal (minimum) wall thickness and is expressed in the form mm,
where x is the value of tolerance for the mean wall thickness, e .
m
NOTE 2 The tolerance for wall thickness, e, at any point, conforms to grade W of ISO 11922-1.
6.5 Length of pipe
The nominal pipe length, l , shall be a minimum length which does not include the depth of the socketed
p
portions, as shown in Figure 1.
NOTE The preferred nominal length of pipe is 6 m. Other lengths are subject to agreement between the
manufacturer and the purchaser.

Figure 1 — Points of measurement for nominal pipe lengths
6.6 Pipes with sockets
6.6.1 Sockets for solvent cementing
The dimensions of sockets for solvent cementing are given in Figure 2. They shall conform to Table 5.
Figure 2 — Socket for solvent cementing
The nominal inside diameter of a socket shall be equal to the nominal outside diameter, d , of the pipe.
n
The maximum included internal angle of the socketed portion shall not exceed 0°30' (30 min).
The requirements for mean inside diameters, d , of sockets shall apply at the midpoint of the socket length
im
Table 5 — Dimensions of sockets for solvent cementing
Dimensions in millimetres
Nominal inside di- Mean inside diameter of Maximum out-of- Minimum socket length
ameter of socket socket roundness ford
i
a b
d d d l
n im,min im,max s,min
12 12,1 12,3 0,25 12,0
16 16,1 16,3 0,25 14,0
20 20,1 20,3 0,25 16,0
25 25,1 25,3 0,25 18,5
32 32,1 32,3 0,25 22,0
40 40,1 40,3 0,25 26,0
50 50,1 50,3 0,3 31,0
63 63,1 63,3 0,4 37,5
75 75,1 75,3 0,5 43,5
90 90,1 90,3 0,6 51,0
110 110,1 110,4 0,7 61,0
125 125,1 125,4 0,8 68,5
140 140,2 140,5 0,9 76,0
160 160,2 160,5 1,0 86,0
180 180,2 180,6 1,1 96,0
200 200,2 200,6 1,2 106,0
225 225,3 225,7 1,4 118,5
250 250,3 250,8 1,5 131,0
280 280,3 280,9 1,7 146,0
315 315,4 316,0 1,9 163,5
355 355,
...