CEN ISO/TS 22391-7:2011

SLOVENSKI STANDARD
01-januar-2012
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Plastics piping systems for hot and cold water installations - Polyethylene of raised
temperature resistance (PE-RT) - Part 7: Guidance for the assessment of conformity
(ISO/PRF TS 22391-7:2011)
Kunststoff-Rohrleitungssysteme für die Warm- und Kaltwasserinstallation - Polyethylen
erhöhter Temperaturbeständigkeit (PE-RT) - Teil 7: Empfehlungen für die Beurteilung
der Konformität (ISO/PRF TS 22391-7:2011)
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 (ISO/PRF TS 22391-7:2011)
Ta slovenski standard je istoveten z: CEN ISO/TS 22391-7:2011
ICS:
23.040.01 Deli cevovodov in cevovodi Pipeline components and
na splošno pipelines in general
91.140.60 Sistemi za oskrbo z vodo Water supply systems
93.025 Zunanji sistemi za prevajanje External water conveyance
vode systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CEN ISO/TS 22391-7
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
November 2011
ICS 93.025; 91.140.60; 23.040.01
English Version
Plastics piping systems for hot and cold water installations -
Polyethylene of raised temperature resistance (PE-RT) - Part 7:
Guidance for the assessment of conformity (ISO/TS 22391-
7:2011)
Systèmes de canalisations en plastique pour les
Kunststoff-Rohrleitungssysteme für die Warm- und
installations d'eau chaude et froide - Polyéthylène de Kaltwasserinstallation - Polyethylen erhöhter
meilleure résistance à la température (PE-RT) - Partie 7: Temperaturbeständigkeit (PE-RT) - Teil 7: Empfehlungen
Guide pour l'évaluation de la conformité (ISO/TS 22391- für die Beurteilung der Konformität (ISO/TS 22391-7:2011)
7:2011)
This Technical Specification (CEN/TS) was approved by CEN on 14 November 2011 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available
promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)
until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN ISO/TS 22391-7:2011: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
This document (CEN ISO/TS 22391-7:2011) has been prepared by Technical Committee CEN/TC 155
“Plastics piping systems and ducting systems", the secretariat of which is held by NEN, in collaboration with
Technical Committee ISO/TC 138 "Plastics pipes, fittings and valves for the transport of fluids".
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria, Croatia, Cyprus,
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
TECHNICAL ISO/TS
SPECIFICATION 22391-7
First edition
2011-11-15
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/TS 22391-7:2011(E)
©
ISO 2011
ISO/TS 22391-7:2011(E)
©  ISO 2011
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing 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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Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2011 – All rights reserved

ISO/TS 22391-7:2011(E)
Contents Page
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Abbreviated terms . 5
5 General . 5
6 Testing and inspection . 6
6.1 Grouping . 6
6.2 Type testing . 7
6.3 Batch release tests . 10
6.4 Process verification tests . 11
6.5 Audit tests . 12
6.6 Indirect tests . 13
6.7 Test records . 13
Bibliography . 14

ISO/TS 22391-7:2011(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.
In other circumstances, particularly when there is an urgent market requirement for such documents, a
technical committee may decide to publish other types of normative document:
 an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical experts in
an ISO working group and is accepted for publication if it is approved by more than 50 % of the members
of the parent committee casting a vote;
 an ISO Technical Specification (ISO/TS) represents an agreement between the members of a technical
committee and is accepted for publication if it is approved by 2/3 of the members of the committee casting
a vote.
An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for a
further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or ISO/TS is
confirmed, it is reviewed again after a further three years, at which time it must either be transformed into an
International Standard or be withdrawn.
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/TS 22391-7 was prepared by the European Committee for Standardization (CEN) Technical Committee
TC 155, Plastics piping systems and ducting systems, in collaboration with ISO 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, in accordance with the Agreement on technical cooperation between ISO and
CEN (Vienna Agreement).
ISO 22391 consists of the following parts, under the general title Plastics piping systems for hot and cold
water installations — Polyethylene of raised temperature resistance (PE-RT):
 Part 1: General
 Part 2: Pipes
 Part 3: Fittings
 Part 5: Fitness for purpose of the system
 Part 7: Guidance for the assessment of conformity [Technical Specification]

iv © ISO 2011 – All rights reserved

ISO/TS 22391-7:2011(E)
Introduction
At the date of publication of this part of ISO 22391, System Standards for piping systems of other plastics
materials used for the same application are the following:
ISO 15874 (all parts), Plastics piping systems for hot and cold water installations — Polypropylene (PP)
ISO 15875 (all parts), Plastics piping systems for hot and cold water installations — Crosslinked polyethylene
(PE-X)
ISO 15876 (all parts), Plastics piping systems for hot and cold water installations — Polybutylene (PB)
ISO 15877 (all parts), Plastics piping systems for hot and cold water installations — Chlorinated poly(vinyl
chloride) (PVC-C)
Figures 1 and 2 are intended to provide general information on the concept of testing and organization of
those tests used for the purpose of the assessment of conformity. For each kind of test, i.e. type test (TT),
batch release test (BRT), process verification test (PVT), and audit test (AT), this part of ISO 22391 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 pipes, fittings or assemblies by manufacturers is given in
Figure 1.
PRODUCTION
Product
development
TT BRT (each batch)
PVT (periodically on selected items)
Test performed by or on behalf of the manufacturer

Key
BRT batch release test
PVT process verification test
TT type testing
Figure 1 — Typical scheme for the assessment of conformity by a manufacturer
A typical scheme for the assessment of conformity of pipes, fittings or assemblies by manufacturers, including
certification, is given in Figure 2.
01-01-year N
01-01-year N+1
Batch
Batch
Batch
Batch
Batch
Batch
ISO/TS 22391-7:2011(E)
Tests performed by a test laboratory on behalf of an inspection body
or certification body
AT AT AT AT AT
PRODUCTION
Product
development
TT BRT (each batch)
PVT (periodically on selected items)
Test performed by or on behalf of the manufacturer

Key
AT audit test
BRT batch release test
PVT process verification test
TT type testing
Figure 2 — Typical scheme for the assessment of conformity by a manufacturer,
including certification
This part of ISO 22391 specifies the requirements for a piping system when made from polyethylene (PE-RT).
The piping system is intended to be used for hot and cold water installations and heating system installations.
See the foreword for a complete listing of all available parts of ISO 22391.
This part of ISO 22391 gives guidance for the assessment of conformity of materials, components, joints, and
assemblies. It is intended for use by certification bodies, inspection bodies, testing laboratories, and
manufacturers.
vi © ISO 2011 – All rights reserved

01-01-year N
01-01-year N+1
Batch
Batch
Batch
Batch
Batch
Batch
TECHNICAL SPECIFICATION ISO/TS 22391-7:2011(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 part of ISO 22391 gives guidance on the assessment of conformity of products and assemblies in
accordance with other 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.
In conjunction with the other parts, this part of ISO 22391 is applicable to hot and cold water installations
within buildings for the conveyance of water, whether or not intended for human consumption (domestic
systems), under design pressures and temperatures appropriate to the class of application.
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 2859-1, Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 3951-1, Sampling procedures for inspection by variables ― Part 1: Specification for single sampling plans
indexed by acceptance quality limit (AQL) for lot-by-lot inspection for a single quality characteristic and a
single AQL
ISO 3951-2, Sampling procedures for inspection by variables ― Part 2: General specification for single
sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection of independent quality
characteristics
ISO 3951-3, Sampling procedures for inspection by variables ― Part 3: Double sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection
ISO 3951-5, Sampling procedures for inspection by variables ― Part 5: Sequential sampling plans indexed by
acceptance quality limit (AQL) for inspection by variables (known standard deviation)
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/TS 22391-7:2011(E)
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, ISO 22391-2, ISO 22391-3
and the following apply.
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
[5]
NOTE A certification body is preferably compliant with ISO/IEC 17021 .
3.2
inspection body
body, that performs inspection
NOTE 1 A body can be an organization, or part of an organization.
[4]
[ISO/IEC 17020:1998 , 2.2]
[4]
NOTE 2 An inspection body is preferably compliant with ISO/IEC 17020 .
3.3
testing laboratory
laboratory which measures, tests, calibrates or otherwise determines the characteristics of the performance of
materials and products
NOTE 1 In the context of this part of ISO/TS 22391, the materials and products can be subjected to type testing, batch
release testing, process verification testing, audit testing, and witness testing, as applicable.
[6]
NOTE 2 A testing laboratory is preferably compliant with ISO/IEC 17025 .
3.4
quality management system
management system to direct and control an organization with regard to quality
[2]
[ISO 9000:2005 , 3.2.3]
[3]
NOTE Requirements for quality management systems are given in ISO 9001 .
3.5
quality plan
document setting out the specific quality practices, resources and sequence of activities relevant to a
particular product or range of products
3.6
type testing
TT
testing performed to prove that the material, component, joint or assembly is capable of conforming to the
requirements given in the relevant standard
NOTE The type test results remain valid until there is a change in the material or product or assembly provided that
process verification tests are done regularly.
2 © ISO 2011 – All rights reserved

ISO/TS 22391-7:2011(E)
3.7
batch release test
BRT
test performed by or on behalf of the manufacturer on a batch of components, which has to be satisfactorily
completed before the batch can be released
3.8
process verification test
PVT
test performed by or on behalf of the manufacturer on materials, components, joints or assemblies at specific
intervals to confirm that the process continues to be capable of producing components which conform to the
requirements given in the relevant standard
NOTE Such tests are not required to release batches of products and are carried out as a measure of process
control.
3.9
audit test
AT
test performed by a test laboratory on behalf of an inspection body or certification body to confirm that the
material, component, joint or assembly continues to conform to the requirements given in the relevant
standard and to provide information to assess the effectiveness of the quality management system
3.10
indirect test
IT
test performed by or on behalf of the manufacturer, different from the test specified for that particular
characteristic, having previously verified its correlation with the specified test
3.11
witness test
WT
testing accepted by an inspection or a certification body for type testing and/or audit testing, which is carried
out by or on behalf of the manufacturer and supervised by a representative of the inspection or certification
body, qualified in testing
3.12
material
generic term for compounds grouped by families, expressed by generic names, e.g. polypropylene, stainless
steel, brass or EPDM
NOTE Definition from European Commission, Directorate-General for Enterprise and Industry, Sub-group on Product
Testing Procedures (EC, DG ENT and IND, SG PTP).
3.13
compound
clearly defined homogeneous mixture of base polymer with additives, i.e. antioxidants, pigments, stabilizers
and others, at a dosage level necessary for the processing and the intended use of the final product
3.14
material batch
clearly identified quantity of a given homogeneous compound manufactured under uniform conditions, and
defined and identified by the compound manufacturer
3.15
product
pipe or fitting of a clearly identified type intended to be a part of a piping system which the manufacturer puts
on the market
ISO/TS 22391-7:2011(E)
3.16
product batch
clearly identified collection of units, manufactured consecutively or continuously under the same conditions,
using material or compound conforming to the same specification
NOTE The product batch is defined and identified by the product manufacturer.
3.17
lot
clearly identifiable sub-division of a batch for inspection purposes
3.18
sample
one or more units of product drawn from a batch or lot, selected at random without regard to their quality
NOTE The number of units of product in the sample is the sample size.
3.19
acceptable quality limit
AQL
quality level that is the worst tolerable process average when a continuing series of lots is submitted for
acceptance sampling
NOTE 1 See ISO 2859-1, ISO 3
...