oSIST ISO 4427-1:2012

Plastics piping systems -- Polyethylene (PE) pipes and fittings for water supply -- Part 1: General

ISO 4427-1:2007 specifies the general aspects of polyethylene (PE) piping systems (mains and service pipes) 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, fittings, their joints 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 1: Généralités

[Not translated]

General Information

• Status: Not Published
• ICS: 23.040.20 - Plastics pipes
• ICS: 23.040.45 - Plastics fittings
• ICS: 91.140.60 - Water supply systems
• Technical Committee: PCV - Plastic pipes, fittings and valves
• Current Stage: 98 - Abandoned project (Adopted Project)
• Start Date: 19-Jan-2012
• Due Date: 24-Jan-2012
• Completion Date: 19-Jan-2012
• Ref Project: ISO 4427-1:2007 - Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply — Part 1: General

Relations

• Revised: SIST ISO 4427:1997 - Polyethylene (PE) pipes for water supply -- Specifications
• Effective Date: 15-Apr-2008
• Revised: ISO 4427:1996 - Polyethylene (PE) pipes for water supply — Specifications
• Effective Date: 12-May-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 4427-1
First edition
2007-08-01

Plastics piping systems — Polyethylene
(PE) pipes and fittings for water supply —
Part 1:
General
Systèmes de canalisations en plastique — Tubes et raccords en
polyéthylène (PE) destinés à l'alimentation en eau —
Partie 1: Généralités




Reference number
ISO 4427-1:2007(E)
©
ISO 2007

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ISO 4427-1:2007(E)
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ii © ISO 2007 – All rights reserved

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ISO 4427-1:2007(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms. 3
3.1 Terms and definitions. 3
3.2 Symbols . 6
3.3 Abbreviated terms . 6
4 Material . 7
4.1 Compound . 7
4.2 Colour . 7
4.3 Use of reprocessable and recyclable material . 7
4.4 Physical characteristics of the compound .7
4.5 Fusion compatibility. 9
4.6 Classification and designation. 10
5 Effect on water quality of pipes intended for conveyance of water for human
consumption . 10
Annex A (informative) Pressure reduction coefficients . 11
Annex B (informative) Resistance to rapid crack propagation. 12
Bibliography . 14

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ISO 4427-1:2007(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 4427-1 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 4427-2, 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 4427-1:2007(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 [9] and [10].

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INTERNATIONAL STANDARD ISO 4427-1:2007(E)

Plastics piping systems — Polyethylene (PE) pipes and fittings
for water supply —
Part 1:
General
1 Scope
This part of ISO 4427 specifies the general aspects of polyethylene (PE) piping systems (mains and service
pipes) 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, fittings, their joints 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 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.
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 3:1973, Preferred numbers — Series of preferred numbers
ISO 472, Plastics — Vocabulary
ISO 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special
characteristics
ISO 1133:2005, Plastics — Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate
(MVR) of thermoplastics

5 2

1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
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ISO 4427-1:2007(E)
ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 1: General method
ISO 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 2: Preparation of pipe test pieces
ISO 1183-2, Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density gradient
column method
ISO 4065:1996, Thermoplastics pipes — Universal wall thickness table
ISO 4427-2:2007, Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply — Part 2:
Pipes
ISO 4427-3:2007, Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply — Part 3:
Fittings
ISO 4427-5:2007, Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply — Part 5:
Fitness for purpose of the system
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 6964:1986, Polyolefin pipes and fittings — Determination of carbon black content by calcination and
pyrolysis — Test method and basic specification
ISO 9080, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of
thermoplastics materials in pipe form by extrapolation
ISO 11357-6:2002, Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation
induction time
ISO 11414, Plastics pipes and fittings — Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test piece
assemblies by butt fusion
ISO 12162, Thermoplastics materials for pipes and fittings for pressure applications — Classification and
designation — Overall service (design) coefficient
ISO 13479:1997, Polyolefin pipes for the conveyance of fluids — Determination of resistance to crack
propagation — Test method for slow crack growth on notched pipes (notch test)
ISO 13761:1996, Plastics pipes and fittings — Pressure reduction factors for polyethylene pipeline systems for
use at temperatures above 20 °C
ISO 13953:2001, Polyethylene (PE) pipes and fittings — Determination of the tensile strength and failure
mode of test pieces from a butt-fused joint
ISO 13954, Plastics pipes and fittings — Peel decohesion test for polyethylene (PE) electrofusion assemblies
of nominal outside diameter greater than or equal to 90 mm
ISO 16871, Plastics piping and ducting systems — Plastics pipes and fittings — Method for exposure to direct
(natural) weathering
ISO 18553, Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin pipes,
fittings and compounds
EN 12099, Plastics piping systems — Polyethylene piping materials and components — Determination of
volatile content
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ISO 4427-1:2007(E)
ISO 15512, Plastics — Determination of water content
Guidelines for drinking water quality, Volume 1: Recommendations, WHO, Geneva, 1984
EC Council Directive 98/83/EC of 3 November 1998 on the quality of water intended for human consumption,
Official Journal of the European Communities
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 3, ISO 472 and ISO 1043-1, and the
following, apply.
3.1.1 Geometrical characteristics
3.1.1.1
nominal size
DN
numerical designation of the size of a component, other than a component designated by a thread size, which
is a convenient round number approximately equal to the manufacturing dimension in millimetres (mm)
3.1.1.2
nominal size
DN/OD
nominal size, related to the outside diameter
3.1.1.3
nominal outside diameter
d
n
specified outside diameter, in millimetres, assigned to a nominal size DN/OD
3.1.1.4
outside diameter at any point
d
e
value of the measurement of the outside diameter through its cross-section at any point of the pipe rounded to
the next greater 0,1 mm
3.1.1.5
mean outside diameter
d
em
value of the measurement of the outer circumference of the pipe or spigot end of a fitting in any cross-section
divided by π (= 3,142), rounded to the next greater 0,1 mm
3.1.1.6
minimum mean outside diameter
d
em min
minimum value of the outside diameter as specified for a given nominal size
3.1.1.7
maximum mean outside diameter
d
em max
maximum value of the outside diameter as specified for a given nominal size
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ISO 4427-1:2007(E)
3.1.1.8
out-of-roundness
ovality
difference between the measured maximum outside diameter and the measured minimum outside diameter in
the same cross-section of the pipe or spigot end of a fitting
3.1.1.9
nominal wall thickness
e
n
numerical designation of the wall thickness of a component, which is a convenient round number
approximately equal to the manufacturing dimension in millimetres
3.1.1.10
wall thickness at any point
e
value of the measurement of the wall thickness at any point around the circumference of a component
3.1.1.11
minimum wall thickness at any point
e
min
minimum value of the wall thickness at any point around the circumference of a component as specified
3.1.1.12
maximum wall thickness at any point
e
max
maximum value of the wall thickness at any point around the circumference of a component as specified
3.1.1.13
mean wall thickness
e
m
arithmetic mean of a number of measurements regularly spaced around the circumference of the component
in the same cross-section of the component, including the measured minimum and the measured maximum
values of the wall thickness
3.1.1.14
pipe series
S
dimensionless number for pipe designation conforming to ISO 4065
NOTE The relationship between the pipe series, S, and the standard dimension ratio, SDR, is given by the following
equation from ISO 4065:
SDR−1
S=
2
3.1.1.15
standard dimension ratio
SDR
ratio of the nominal outside diameter, d , of a pipe to its nominal wall thickness, e
n n
3.1.1.16
tolerance
permissible variation of the specified value of a quantity expressed as the difference between the permissible
maximum and permissible minimum values
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ISO 4427-1:2007(E)
3.1.2 Related to service conditions
3.1.2.1
nominal pressure
PN
numerical designation used for reference purposes related to the mechanical characteristics of the component
of a piping system
NOTE For plastic piping systems conveying water, it corresponds to the maximum continuous operating pressure,
expressed in bar, which can be sustained with water at 20 °C, based on the minimum design coefficient.
3.1.2.2
maximum operating pressure
MOP
maximum effective pressure of the fluid in the piping system, expressed in bar, which is allowed in continuous
use
It takes into account the physical and the mechanical characteristics of the components of a piping system
NOTE It is calculated using the following equation:
20 MRS
()
MOP=
C×−⎡⎤()SDR 1
⎣⎦
3.1.2.3
allowable operating pressure
PFA
maximum hydrostatic pressure that a component is capable of withstanding continuously in service
3.1.3 Related to material characteristics
3.1.3.1
lower confidence limit of the predicted hydrostatic strength at 20 °C for 50 years
σ
LPL
quantity, with the dimensions of stress expressed in megapascals, which can be considered as a property of
the material, and which represents the 97,5 % lower confidence limit of the predicted hydrostatic strength at
...