ISO 4427-5:2019

Plastics piping systems for water supply, and for drainage and sewerage under pressure - Polyethylene (PE) - Part 5: Fitness for purpose of the system

This document specifies the characteristics of the fitness for purpose of pipes and/or fittings assemblies made from polyethylene (PE) for buried or above ground applications, intended for the conveyance of water for human consumption, raw water prior to treatment, drainage and sewerage under pressure, vacuum sewer systems, and water for other purposes. NOTE 1 The intended uses include sea outfalls, laid in water and pipes suspended below bridges. NOTE 2 This document is intended to be only used by the product manufacturer to assess the performance of components according to ISO 4427‑2 and/or ISO 4427‑3 when joined together under normal and extreme conditions. It is not intended for on-site testing of pipe systems. This document also specifies the test parameters for the test methods referred to in this document. In conjunction with the other parts of the ISO 4427 series, this document is applicable to PE pipes, fittings, their joints and to joints with components of PE and other materials, intended to be used under the following conditions: a) a maximum allowable operating pressure (PFA) up to and including 25 bar[1]; b) an operating temperature of 20 °C as the reference temperature. NOTE 3 For other operating temperatures, guidance is given in ISO 4427‑1: 2019, Annex A. The ISO 4427 series covers a range of maximum allowable operating pressures and gives requirements concerning colours. [1] 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.

Systèmes de canalisations en plastique destinés à l'alimentation en eau et aux branchements et collecteurs d'assainissement sous pression — Polyéthylène (PE) — Partie 5: Aptitude à l'emploi du système

General Information

• Status: Published
• Publication Date: 05-Aug-2019
• ICS: 23.040.20 - Plastics pipes
• ICS: 23.040.45 - Plastics fittings
• ICS: 91.140.60 - Water supply systems
• ICS: 93.025 - External water conveyance systems
• Technical Committee: ISO/TC 138/SC 2 - Plastics pipes and fittings for water supplies
• Drafting Committee: ISO/TC 138/SC 2/WG 4 - PE piping systems for water supply
• Current Stage: 9092 - International Standard to be revised
• Start Date: 15-Dec-2025
• Completion Date: 27-Dec-2025

Relations

• Revises: ISO 4427-5:2007 - Plastics piping systems - Polyethylene (PE) pipes and fittings for water supply - Part 5: Fitness for purpose of the system
• Effective Date: 20-Aug-2016

Overview

ISO 4427-5:2019 defines the fitness for purpose of polyethylene (PE) piping assemblies used in water supply, drainage and sewerage under pressure. It applies to buried and above‑ground PE pipes, fittings and joints intended for potable water, raw water prior to treatment, pressurised drainage and sewerage (including vacuum sewer systems), sea outfalls, pipes laid in water and pipes suspended below bridges. The standard is intended for product manufacturers to assess assembled component performance (not for on‑site system testing). It covers systems with a maximum allowable operating pressure (PFA) up to 25 bar and uses 20 °C as the reference temperature.

Key topics and requirements

• Scope of assemblies: PE pipes and fittings joined by electrofusion, butt fusion, socket fusion and mechanical joints. Size groups span nominal outside diameters from about ≥16 mm up to and beyond 1 800 mm.
• Preparation and grouping: Procedures for preparing test assemblies, grouping by size and product type, and required test-piece preparation.
• Joint types and criteria: Requirements for:
  • Electrofusion socket and saddle joints (decohesive resistance / cohesive strength)
  • Butt-fusion assemblies (tensile strength and failure mode)
  • Mechanical fittings and socket fusion joints
• Test methods and parameters: Specifies test parameters and references internationally recognised methods (e.g., ISO 1167 series for internal pressure resistance; ISO 11413/11414 for electrofusion and butt fusion preparation; ISO 13953/13954/13955/13956 for joint tensile/peel/crushing/decohesion tests; ISO 17885 for mechanical fittings).
• Normal and extreme conditions: Defines test conditions for ambient (≈23 °C) and extreme fusion conditions, including energy ranges and conditioning. Manufacturers must declare compatible pipe SDR ranges, material designations and fusion parameters.

Practical applications

• Product development and type testing of PE piping systems for potable water, irrigation, industrial water, sewer under pressure and coastal outfalls.
• Quality assurance and type approval of fittings and joint technologies (electrofusion, butt fusion, mechanical).
• Technical specifications for procurement, tender documents and conformity assessment for municipal water utilities and infrastructure projects.
• Basis for laboratory testing programs that verify joint performance, durability and failure modes under defined temperature and pressure conditions.

Who should use this standard

• PE pipe and fitting manufacturers (assembly performance assessment)
• Test and certification laboratories (type testing and validation)
• System designers, specifiers and procurement teams for water and sewer projects
• Regulatory bodies and compliance assessors

Related standards (selection)

• ISO 4427-1, -2, -3 (series general rules, pipes, fittings)
• ISO 1167-1/2/4, ISO 11413, ISO 11414, ISO 13953–13956, ISO 17885

Keywords: ISO 4427-5:2019, polyethylene (PE), fitness for purpose, electrofusion, butt fusion, socket fusion, mechanical joints, potable water, drainage, sewerage under pressure, PE piping systems.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 4427-5
Second edition
2019-08
Plastics piping systems for water
supply, and for drainage and sewerage
under pressure — Polyethylene (PE) —
Part 5:
Fitness for purpose of the system
Systèmes de canalisations en plastique destinés à l'alimentation
en eau et aux branchements et collecteurs d'assainissement sous
pression — Polyéthylène (PE) —
Partie 5: Aptitude à l'emploi du système
Reference number
©
ISO 2019
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 2
4 Fitness for purpose of pipes and/or fittings assemblies . 2
4.1 Method of preparation of assemblies for testing . 2
4.1.1 General. 2
4.1.2 Grouping . 2
4.1.3 Fitting types . 3
4.1.4 Electrofusion joints (A and B) . 3
4.1.5 Butt fusion joints (C) . 3
4.1.6 Mechanical joints (D) . 3
4.1.7 Socket fusion joints (E) . 3
4.2 Requirements for fitness for purpose of the assemblies . 4
4.2.1 General. 4
4.2.2 Fitness for purpose of the electrofusion assemblies (A and B) . 4
4.2.3 Fitness for purpose of butt fusion assemblies (C) . 5
4.2.4 Fitness for purpose of the mechanical assemblies (D) . 6
4.2.5 Fitness for purpose of socket fusion assemblies (E) . 6
4.3 Conditioning . 6
4.4 Requirements . 6
4.5 Retest in case of failure at 80 °C . 7
Bibliography . 9
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 documents 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).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
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, fitting and valves for
the transport of fluids, Subcommittee SC 2, Plastics pipes and fittings for water supplies.
This second edition cancels and replaces the first edition (ISO 4427-5:2007), which has been technically
revised.
The main changes compared to the previous edition are:
— Update of the normative references;
— Technical consistency with ISO 4437-5 (see Reference [1] in the Bibliography).
A list of all parts in the ISO 4427 series can be found on the ISO website.
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.
iv © ISO 2019 – All rights reserved

Introduction
The ISO 4427 series of standards are a set of system standards that specify the requirements for a
piping system and its components when made from polyethylene (PE). The piping system is intended
to be used in buried or above ground applications, for the conveyance of water for human consumption,
raw water prior to treatment, drainage and sewerage under pressure, vacuum sewer systems, and
water for other purposes.
In respect of potential adverse effects on the quality of water intended for human consumption caused
by the products covered by the ISO 4427 series, it does not provide information on the restriction on
the use of products.
NOTE Guidance for assessment of conformity can be found in Reference [2] in the Bibliography .
INTERNATIONAL STANDARD ISO 4427-5:2019(E)
Plastics piping systems for water supply, and for drainage
and sewerage under pressure — Polyethylene (PE) —
Part 5:
Fitness for purpose of the system
1 Scope
This document specifies the characteristics of the fitness for purpose of pipes and/or fittings assemblies
made from polyethylene (PE) for buried or above ground applications, intended for the conveyance of
water for human consumption, raw water prior to treatment, drainage and sewerage under pressure,
vacuum sewer systems, and water for other purposes.
NOTE 1 The intended uses include sea outfalls, laid in water and pipes suspended below bridges.
NOTE 2 This document is intended to be only used by the product manufacturer to assess the performance
of components according to ISO 4427-2 and/or ISO 4427-3 when joined together under normal and extreme
conditions. It is not intended for on-site testing of pipe systems.
This document also specifies the test parameters for the test methods referred to in this document.
In conjunction with the other parts of the ISO 4427 series, this document is applicable to PE pipes,
fittings, their joints and to joints with components of PE and other materials, intended to be used under
the following conditions:
1)
a) a maximum allowable operating pressure (PFA) up to and including 25 bar ;
b) an operating temperature of 20 °C as the reference temperature.
NOTE 3 For other operating temperatures, guidance is given in ISO 4427-1: 2019, Annex A.
The ISO 4427 series covers a range of maximum allowable operating pressures and gives requirements
concerning colours.
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 1167-1:2006, 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 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 4: Preparation of assemblies
ISO 4427-1:2019, Plastics piping systems for water supply, and for drainage and sewerage under pressure —
Polyethylene (PE) — Part1: General
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
ISO 4427-2:2019, Plastics piping systems for water supply, and for drainage and sewerage under pressure —
Polyethylene (PE) — Part 2: Pipes
ISO 4427-3:2019, Plastics piping systems for water supply, and for drainage and sewerage under pressure —
Polyethylene (PE) — Part 3: Fittings
ISO 11413:2019, Plastics pipes and fittings — Preparation of test piece assemblies between a polyethylene
(PE) pipe and an electrofusion fitting
ISO 11414:2009, 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
ISO 13956, Plastics pipes and fittings — Decohesion test of polyethylene (PE) saddle fusion joints —
Evaluation of ductility of fusion joint interface by tear test
ISO 17885, Plastics piping systems — Mechanical fittings for pressure piping systems — Specifications
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.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
4 Fitness for purpose of pipes and/or fittings assemblies
4.1 Method of preparation of assemblies for testing
4.1.1 General
The assemblies shall be made by using pipes conforming to ISO 4427-2 and fittings conforming to
ISO 4427-3.
Test pieces for pressure testing shall be closed with pressure-tight, end-load-bearing end caps, plugs, or
flanges which shall
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