ISO 4427-5:2007
(Main)Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply — Part 5: Fitness for purpose of the system
Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply — Part 5: Fitness for purpose of the system
ISO 4427-5:2007 specifies the characteristics of the fitness for purpose of assembled piping systems 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, fittings, valves, their joints and to 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 5: Aptitude à l'emploi du système
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 4427-5
First edition
2007-08-01
Plastics piping systems — Polyethylene
(PE) pipes and fittings for water supply —
Part 5:
Fitness for purpose of the system
Systèmes de canalisations en plastique — Tubes et raccords en
polyéthylène (PE) destinés à l'alimentation en eau —
Partie 5: Aptitude à l'emploi du système
Reference number
ISO 4427-5:2007(E)
©
ISO 2007
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ISO 4427-5:2007(E)
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ii © ISO 2007 – All rights reserved
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ISO 4427-5:2007(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 4427-5 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.
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 4427-5:2007(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.
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INTERNATIONAL STANDARD ISO 4427-5:2007(E)
Plastics piping systems — Polyethylene (PE) pipes and fittings
for water supply —
Part 5:
Fitness for purpose of the system
1 Scope
This part of ISO 4427 specifies the characteristics of the fitness for purpose of assembled piping systems
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, fittings, valves, their joints and to
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.
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 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 1: General method
ISO 1167-3, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 3: Preparation of components
ISO 3458, Assembled joints between fittings and polyethylene (PE) pressure pipes — Test of leakproofness
under internal pressure
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
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ISO 4427-5:2007(E)
ISO 3459, Polyethylene (PE) pressure pipes — Joints assembled with mechanical fittings — Internal under-
pressure test method and requirement
ISO 3501, Assembled joints between fittings and polyethylene (PE) pressure pipes — Test of resistance to
pull-out
ISO 3503, Assembled joints between fittings and polyethylene (PE) pressure pipes — Test of leakproofness
under internal pressure when subjected to bending
ISO 4427-1:2007, Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply — Part 1:
General
ISO 4427-3, Plastics piping systems — Polyethylene (PE) pipes and fittings for water supply — Part 3: Fittings
ISO 11413:1996, Plastics pipes and fittings — Preparation of test piece assemblies between a polyethylene
(PE) pipe and an electrofusion fitting
ISO 11414:1996, Plastics pipes and fittings — Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test
piece assemblies by butt fusion
ISO 13953, 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 13955, Plastics pipes and fittings — Crushing decohesion test for polyethylene (PE) electrofusion
assemblies
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
and the following terms and definitions apply.
3.1
electrofusion joint
joint between a PE socket or saddle electrofusion fitting and pipe or fitting with spigotted ends, made by
heating the electrofusion fittings by the Joule effect of the heating element incorporated at their jointing
surfaces, causing the material adjacent to them to melt and the pipe and fitting surfaces to fuse
3.2
butt fusion joint
joint made by heating the planed ends of matching surfaces by holding them against a flat heating plate until
the PE material reaches fusion temperature, quickly removing the heating plate and pushing the two softened
ends against one another
3.3
saddle fusion joint
joint made by heating the curved surface of a saddle and the outside surface of a pipe by holding them
against a heated tool until the PE material reaches fusion temperature, quickly removing the heated tool and
pushing the two softened surfaces against each other
3.4
mechanical joint
joint made by assembling a PE pipe to another PE pipe, or any other element of the piping system that
generally includes a compression part, to provide for pressure integrity, leaktightness and resistance to end
loads
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ISO 4427-5:2007(E)
NOTE 1 A support sleeve inserted into the pipe bore can be used to provide a permanent support for the PE pipe to
prevent creep in the pipe wall under radial compressive forces.
NOTE 2 Metallic parts of these fittings can be assembled to metallic pipes by jointing threads, compression joints, or
welded or flanged connections including PE flanges. The fitting can allow either a dismountable or permanently assembled
joint.
3.5
fusion compatibility
ability of two similar or dissimilar polyethylene (PE) materials to be fused togeth
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