SIST ISO 4427-2:2007
Plastics piping systems -- Polyethylene (PE) pipes and fittings for water supply -- Part 2: Pipes
Plastics piping systems -- Polyethylene (PE) pipes and fittings for water supply -- Part 2: Pipes
ISO 4427-2:2007 specifies the pipes made from polyethylene (PE) intended for the conveyance of water for human consumption, including raw water prior to treatment and water for general purposes. It also specifies the test parameters for the test methods to which it refers.
In conjunction with the other parts of ISO 4427, it is applicable to PE pipes, their joints, to joints with components of PE and to mechanical joints with components of other materials, intended to be used under the following conditions: a maximum operating pressure (MOP) up to and including 25 bar; an operating temperature of 20 �C as the reference temperature.
Systèmes de canalisations en plastique -- Tubes et raccords en polyéthylène (PE) destinés à l'alimentation en eau -- Partie 2: Tubes
[Not translated]
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 4427-2
First edition
2007-08-01
Plastics piping systems — Polyethylene
(PE) pipes and fittings for water supply —
Part 2:
Pipes
Systèmes de canalisations en plastique — Tubes et raccords en
polyéthylène (PE) destinés à l'alimentation en eau —
Partie 2: Tubes
Reference number
ISO 4427-2:2007(E)
©
ISO 2007
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ISO 4427-2:2007(E)
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ii © ISO 2007 – All rights reserved
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ISO 4427-2:2007(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 2
3 Terms, definitions, symbols and abbreviated terms. 2
4 Material . 3
4.1 Compound . 3
4.2 Identification compound . 3
5 General characteristics . 3
5.1 Appearance . 3
5.2 Colour . 3
5.3 Effect on water quality. 3
6 Geometrical characteristics. 3
6.1 Measurements. 3
6.2 Mean outside diameter and out-of-roundness (ovality). 3
6.3 Wall thicknesses and their tolerances. 5
6.4 Coiled pipe. 10
6.5 Lengths . 10
7 Mechanical characteristics . 10
7.1 Conditioning. 10
7.2 Requirements . 10
7.3 Retest in case of failure at 80 °C . 12
8 Physical characteristics. 12
8.1 Conditioning. 12
8.2 Requirements . 12
9 Chemical characteristics of pipes in contact with chemicals. 14
10 Performance requirements . 14
11 Marking . 14
11.1 General. 14
11.2 Minimum required marking of pipes. 14
Annex A (normative) Layered pipes. 15
Annex B (informative) Relationship between PN, MRS, S and SDR . 17
Bibliography . 18
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ISO 4427-2:2007(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 4427-2 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.
This first edition, together with ISO 4427-1, cancels and replaces ISO 4427:1996, of which it constitutes a
technical revision.
ISO 4427 consists of the following parts, under the general title Plastics piping systems — Polyethylene (PE)
pipes and fittings for water supply:
⎯ Part 1: General
⎯ Part 2: Pipes
⎯ Part 3: Fittings
⎯ Part 5: Fitness for purpose of the system
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ISO 4427-2:2007(E)
Introduction
ISO 4427, the system standard, specifies the requirements for a piping system and its components when
made from polyethylene (PE). The piping system is intended to be used for water supply intended for human
consumption, including the conveyance of raw water prior to treatment and that of water for general purposes.
In respect of potential adverse effects on the quality of water intended for human consumption caused by the
products covered by ISO 4427:
a) ISO 4427 provides no information as to whether the products may be used without restriction;
b) existing national regulations concerning the use and/or the characteristics of these products are in force.
NOTE Guidance for assessment of conformity can be found in Bibliographical references [5] and [6].
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INTERNATIONAL STANDARD ISO 4427-2:2007(E)
Plastics piping systems — Polyethylene (PE) pipes and fittings
for water supply —
Part 2:
Pipes
1 Scope
This part of ISO 4427 specifies the pipes made from polyethylene (PE) intended for the conveyance of water
for human consumption, including raw water prior to treatment and water for general purposes.
It also specifies the test parameters for the test methods to which it refers.
In conjunction with the other parts of ISO 4427, it is applicable to PE pipes, their joints, to joints with
components of PE and to mechanical joints with components of other materials, intended to be used under
the following conditions:
1)
a) a maximum operating pressure (MOP) up to and including 25 bar ;
b) an operating temperature of 20 °C as the reference temperature.
NOTE 1 For applications operating at constant temperatures greater than 20 °C and up to 40 °C, see ISO 4427-1:2007,
Annex A.
NOTE 2 ISO 4427 covers a range of maximum operating pressures and gives requirements concerning colours and
additives. 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 guidance or regulations and installation practices or
codes.
Three types of pipe are specified:
⎯ PE pipes (outside diameter d ), including any identification stripes;
n
⎯ PE pipes with co-extruded layers on either or both the outside and/or inside of the pipe (total outside
diameter d ), as specified in Annex A, where all layers have the same MRS rating.
n
⎯ PE pipes (outside diameter d ) having a peelable, contiguous, thermoplastics additional layer on the
n
outside of the pipe (“coated pipe”), see Annex A.
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
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ISO 4427-2:2007(E)
2 Normative references
The following referenced documents are indispensable for the application 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 1133:2005, Plastics — Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate
(MVR) of thermoplastics
ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 1: General method
ISO 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 2: Preparation of pipe test pieces
ISO 2505, Thermoplastics pipes — Longitudinal reversion — Test method and parameters
ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 4065, Thermoplastics pipes — Universal wall thickness table
ISO 4427-1:2007, Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply — Part 1:
General
ISO 4427-5:2007, Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply — Part 5:
Fitness for purpose of the system
ISO 4433-1:1997, Thermoplastics pipes — Resistance to liquid chemicals — Classification —
Part 1: Immersion test method
ISO 4433-2:1997, Thermoplastics pipes — Resistance to liquid chemicals — Classification —
Part 2: Polyolefin pipes
ISO 6259-1:1997, Thermoplastics pipes — Determination of tensile properties — Part 1: General test method
ISO 6259-3:1997, Thermoplastics pipes — Determination of tensile properties — Part 3: Polyolefin pipes
ISO 11357-6:2002, Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation
induction time
ISO 11922-1:1997, Thermoplastics pipes for the conveyance of fluids — Dimensions and tolerances — Part 1:
Metric series
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the terms, definitions, symbols and abbreviated terms given in ISO 4427-1
apply.
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ISO 4427-2:2007(E)
4 Material
4.1 Compound
The material from which the pipes are made shall be in accordance with ISO 4427-1.
4.2 Identification compound
Where applicable, the compound used for identification stripes and co-extruded layers (see 5.2) shall be
manufactured from a PE polymer manufactured from the same type of base polymer as used in the compound
for pipe production.
For co-extruded layers used for identification purposes, Annex A applies.
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 such as would prevent conformity of the pipe to this part
of ISO 4427. The pipe ends shall be cut cleanly and square to the axis of the pipe.
5.2 Colour
The pipes shall be either blue or black, or black with blue stripes. For coated pipes in accordance with
Annex A, this applies to the coating.
Blue pipes or black pipes with blue stripes are intended for drinking water only.
For above-ground installations, all blue components and components with non-black layers should be
protected from direct UV light.
5.3 Effect on water quality
Attention is drawn to the requirements of national regulations (see also the Introduction). See
ISO 4427-1:2007, Clause 5.
6 Geometrical characteristics
6.1 Measurements
The dimensions of the pipe shall be measured in accordance with ISO 3126. In case of dispute, the
measurements of dimensions shall be made not less than 24 h after manufacture and after conditioning for at
least 4 h at (23 ± 2) °C.
6.2 Mean outside diameter and out-of-roundness (ovality)
The mean outside diameters, d , and the out-of-roundness (ovality) shall be in accordance with Table 1.
em
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ISO 4427-2:2007(E)
Table 1 — Mean outside diameters and out-of-roundness
Dimensions in millimetres
a
Nominal outside Mean outside diameter Maximum
Nominal size DN/OD
diameter out-of-roundness
d d b
em min em max
d (ovality)
n
16 16 16,0 16,3 1,2
20 20 20,0 20,3 1,2
25 25 25,0 25,3 1,2
32 32 32,0 32,3 1,3
40 40 40,0 40,4 1,4
50 50 50,0 50,4 1,4
63 63 63,0 63,4 1,5
75 75 75,0 75,5 1,6
90 90 90,0 90,6 1,8
110 110 110,0 110,7 2,2
125 125 125,0 125,8 2,5
140 140 140,0 140,9 2,8
160 160 160,0 161,0 3,2
180 180 180,0 181,1 3,6
200 200 200,0 201,2 4,0
225 225 225,0 226,4 4,5
250 250 250,0 251,5 5,0
280 280 280,0 281,7 9,8
315 315 315,0 316,9 11,1
355 355 355,0 357,2 12,5
400 400 400,0 402,4 14,0
450 450 450,0 452,7 15,6
500 500 500,0 503,0 17,5
560 560 560,0 563,4 19,6
630 630 630,0 633,8 22,1
710 710 710,0 716,4 —
800 800 800,0 807,2 —
900 900 900,0 908,1 —
1 000 1 000 1 000,0 1 009,0 —
c
1 200 1 200 1 200,0 1 210,8 —
c
1 400 1 400 1 400,0 1 412,6 —
c
1 600 1 600 1 600,0 1 614,4 —
c
1 800 1 800 1 800,0 1 816,2 —
c
2 000 2 000 2 000,0 2 018,0 —
For coiled pipe and for straight lengths with diameters W 710, the maximum out-of-roundness shall be agreed between
manufacturer and purchaser.
a
In accordance with ISO 11922-1:1997, grade B, for sizes u 630 and grade A for sizes W 710.
b
In accordance with ISO 11922-1:1997, grade N, for sizes u 630, is measured at the point of manufacture.
c
Tolerance calculated as 0,009 d and does not conform to grade A in ISO 11922-1:1997.
em
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ISO 4427-2:2007(E)
NOTE Tolerance bands in accordance with ISO 11922-1 are calculated as follows, as applicable.
a) Grade A: 0,009d rounded to the next greater 0,1 mm with a minimum value of 0,3 mm and a maximum value of
n
10,0 mm.
b) Grade B: 0,006d rounded up to the next greater 0,1 mm with a minimum value of 0,3 mm and a maximum value of
n
4,0 mm.
c) Grade N:
⎯ for diameters u 75 mm (0,008 d + 1) mm,
n
⎯ for diameters W 90 mm and u 250 mm (0,02 d ) mm,
n
⎯ for diameters > 250 mm (0,035 d ) mm,
n
rounded up to the next 0,1 mm.
6.3 Wall thicknesses and their tolerances
The wall thickness shall be in accordance with Table 2.
NOTE The relationship between PN, MRS, S and SDR is given in Annex B.
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ISO 4427-2:2007(E)
Table 2 — Wall thicknesses
Pipe series
SDR 6 SDR 7,4 SDR 9 SDR 11 SDR 13,6 SDR 17
S 2,5 S 3,2 S 4 S 5 S 6,3 S 8
a
Nominal pressure (PN)
bar
PE 40 — PN 10 PN 8 — PN 5 PN 4
PE 63 — — — PN 10 PN 8 —
PE 80 PN 25 PN 20 PN 16 PN 12,5 PN 10 PN 8
PE 100 — PN 25 PN 20 PN 16 PN 12,5 PN 10
b
Wall thicknesses
Nominal
mm
size
e e e e e e e e e e e e
min max min max min max min max min max min max
c c
16 3,0 3,4 2,3 2,7 2,0 2,3 — — — — — —
c c
20 3,4 3,9 3,0 3,4 2,3 2,7 2,0 2,3 — — — —
c c
25 4,2 4,8 3,5 4,0 3,0 3,4 2,3 2,7 2,0 2,3 — —
c
32 5,4 6,1 4,4 5,0 3,6 4,1 3,0 3,4 2,4 2,8 2,0 2,3
40 6,7 7,5 5,5 6,2 4,5 5,1 3,7 4,2 3,0 3,5 2,4 2,8
50 8,3 9,3 6,9 7,7 5,6 6,3 4,6 5,2 3,7 4,2 3,0 3,4
63 10,5 11,7 8,6 9,6 7,1 8,0 5,8 6,5 4,7 5,3 3,8 4,3
75 12,5 13,9 10,3 11,5 8,4 9,4 6,8 7,6 5,6 6,3 4,5 5,1
90 15,0 16,7 12,3 13,7 10,1 11,3 8,2 9,2 6,7 7,5 5,4 6,1
110 18,3 20,3 15,1 16,8 12,3 13,7
...
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