ISO/TS 22391-7:2018

TECHNICAL ISO/TS
SPECIFICATION 22391-7
Second edition
2018-11
Plastics piping systems for hot
and cold water installations —
Polyethylene of raised temperature
resistance (PE-RT) —
Part 7:
Guidance for the assessment of
conformity
Systèmes de canalisations en plastique pour les installations d'eau
chaude et froide — Polyéthylène de meilleure résistance à la
température (PE-RT) —
Partie 7: Guide pour l'évaluation de la conformité
Reference number
©
ISO 2018
© ISO 2018
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Published in Switzerland
ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 4
5 General . 5
6 Testing and inspection . 5
6.1 Grouping . 5
6.1.1 General. 5
6.1.2 Pressure groups . 5
6.1.3 Size groups . 5
6.1.4 Fitting groups . 6
6.2 Type testing (TT) . 6
6.3 Batch release tests (BRT) .11
6.4 Process verification tests (PVT) .12
6.5 Audit tests (AT) .13
6.6 Indirect tests (IT) .14
6.7 Test records.14
Annex A (informative) Basic test matrix .15
Bibliography .16
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 the European Committee for Standardization (CEN) Technical
Committee CEN/TC 155, Plastics piping systems and ducting systems, in collaboration with ISO
Technical Committee TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee
SC 2, Plastics pipes and fittings for water supplies, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO/TS 22391-7:2011), which has been
technically revised.
The major technical changes are:
— Addition of new definitions of the terms “material”, compound” and “material grade”;
— Revision of 6.2 “Type testing (TT)” with a special focus on Table 4.
A list of all parts in the ISO 22391 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 2018 – All rights reserved

Introduction
This document can be used to support elaboration of national third party certification procedures for
products conforming to the applicable part(s) of ISO 22391.
This document is a part of a System Standard for plastics piping systems of a particular material for a
specified application. There are a number of such System Standards.
At the date of publication of this document, System Standards for piping systems of other plastics
materials used for the same application are the following:
— ISO 15874, Plastics piping systems for hot and cold water installations — Polypropylene (PP)
— ISO 15875, Plastics piping systems for hot and cold water installations — Cross-linked polyethylene (PE-X)
— ISO 15876, Plastics piping systems for hot and cold water installations — Polybutene (PB)
— ISO 15877, Plastics piping systems for hot and cold water installations — Chlorinated poly(vinyl
chloride) (PVC-C)
— ISO 21003, Multilayer piping systems for hot and cold water installations inside buildings
They are supported by separate standards on test methods to which references are made throughout
the System Standard.
The System Standards are consistent with general standards on functional requirements and on
recommended practice for installation.
Figures 1 and 2 are intended to provide general information on the concept of testing and organisation
of those tests used for the purpose of the assessment of conformity. For each type of test, i.e. type testing
(TT), batch release test (BRT), process verification test (PVT), and audit test (AT), this document details
the applicable characteristics to be assessed as well as the frequency and sampling of testing.
A typical scheme for the assessment of conformity of materials, compounds, pipes, fittings, valves,
joints or assemblies by product manufacturers is given in Figure 1.
Figure 1 — Typical scheme for the assessment of conformity by a product manufacturer
A typical scheme for the assessment of conformity of pipes, fittings, joints or assemblies by
manufacturers, including certification, is given in Figure 2.
Figure 2 — Typical scheme for the assessment of conformity by a product manufacturer,
including certification
vi © ISO 2018 – All rights reserved

TECHNICAL SPECIFICATION ISO/TS 22391-7:2018(E)
Plastics piping systems for hot and cold water
installations — Polyethylene of raised temperature
resistance (PE-RT) —
Part 7:
Guidance for the assessment of conformity
1 Scope
This document gives requirements and guidance for the assessment of conformity of materials,
products, and assemblies in accordance with the applicable part(s) of ISO 22391 intended to be included
in the manufacturer’s quality plan as part of the quality management system and for the establishment
of certification procedures.
NOTE In order to help the reader, a basic test matrix is given in Annex A.
In conjunction with the other parts of ISO 22391 (see Foreword), this document is applicable to
polyethylene of raised temperature resistance (PE-RT) piping systems intended to be used for hot
and cold water installations within buildings for the conveyance of water, whether or not intended
for human consumption (domestic systems) and for heating systems, under design pressures and
temperatures appropriate to the class of application (see ISO 22391-1:2009, Table 1).
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 22391-1:2009, Plastics piping systems for hot and cold water installations — Polyethylene of raised
temperature resistance (PE-RT) — Part 1: General
ISO 22391-2:2009, Plastics piping systems for hot and cold water installations — Polyethylene of raised
temperature resistance (PE-RT) — Part 2: Pipes
ISO 22391-3:2009, Plastics piping systems for hot and cold water installations — Polyethylene of raised
temperature resistance (PE-RT) — Part 3: Fittings
ISO 22391-5:2009, Plastics piping systems for hot and cold water installations — Polyethylene of raised
temperature resistance (PE-RT) — Part 5: Fitness for purpose of the system
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 22391-1 and ISO 22391-3 and
the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http: //www .electropedia .org/
— ISO Online browsing platform: available at http: //www .iso .org/obp
3.1
certification body
impartial body, governmental or non-governmental, possessing the necessary competence and
responsibility to carry out certification of conformity according to given rules of procedure and
management
[2]
Note 1 to entry: A certification body is preferably compliant with ISO/IEC 17065 .
3.2
inspection body
body that performs inspection
Note 1 to entry: An inspection body can be an organization, or part of an organization.
[3]
Note 2 to entry: An inspection body is preferably compliant with ISO/IEC 17020 .
[3]
[SOURCE: ISO/IEC 17020:2012 , 3.5]
3.3
testing laboratory
laboratory which measures, tests, calibrates or otherwise determines the characteristics of the
performance of materials and products
[4]
Note 1 to entry: A testing laboratory is preferably compliant with ISO/IEC 17025 .
3.4
quality management system
part of a management system with regard to quality
[6]
Note 1 to entry: Requirements for quality management systems are given in ISO 9001 .
[5]
[SOURCE: ISO 9000:2015 , 3.5.4]
3.5
quality plan
document setting out the specific quality practices,
...