ISO/TS 22391-7:2018

Plastics piping systems for hot and cold water installations — Polyethylene of raised temperature resistance (PE-RT) — Part 7: Guidance for the assessment of conformity

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).

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

General Information

• Status: Published
• Publication Date: 22-Nov-2018
• ICS: 23.040.01 - Pipeline components and pipelines in general
• 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 - Plastics pipes and fittings for water supplies
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 14-Sep-2021

Relations

• Revises: ISO/TS 22391-7:2011 - Plastics piping systems for hot and cold water installations — Polyethylene of raised temperature resistance (PE-RT) — Part 7: Guidance for the assessment of conformity
• Effective Date: 05-Nov-2015

Standards Content (Sample)

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/TS 22391-7:2018(E)
ISO 2018
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ISO/TS 22391-7:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2018

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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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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Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
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ISO/TS 22391-7:2018(E)
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

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ISO/TS 22391-7:2018(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.

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.
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ISO/TS 22391-7:2018(E)
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.
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ISO/TS 22391-7:2018(E)

Figure 2 — Typical scheme for the assessment of conformity by a product manufacturer,

including certification
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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
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ISO/TS 22391-7:2018(E)
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, resources and sequence of activities relevant to a

particular product or range of products
3.6
type testing

testing performed to prove that the compound (3.13), component (3.21), product, (3.16), joint (3.22) or

assembly (3.23) is capable of conforming to the requirements given in the relevant standard

Note 1 to entry: The type test results remain valid until there is a change in the compound (3.13) or product (3.16)

or assembly (3.23) provided that the process verification tests are done regularly.

3.7
batch release test
BRT

test performed by or on behalf of the manufacturer on a batch of compound (3.13), components (3.21) or

products (3.16), which has to be satisfactorily completed before the batch can be released

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ISO/TS 22391-7:2018(E)
3.8
process verification test
PVT

test performed by or on behalf of the product manufacturer on compounds (3.13), components (3.21),

products (3.16) or joints (3.22) at specific intervals to confirm that the process continues to be capable

of producing components (3.21) and products (3.16) which conform to the requirements given in the

relevant standard

Note 1 to entry: Such tests are not required to release batches of materials (3.12), compound (3.13), components

(3.21) or products (3.16) and are carried out as a measure of process control.
3.9
audit test

test performed by a test laboratory on behalf of an inspection body (3.2) or certification body (3.1) to

confirm that the material, compound (3.13), components (3.21), product (3.16), joint (3.22) or assembly

(3.23) continues to conform to the requirements given in the relevant standard and to provide

information to assess the effectiveness of the quality management system (3.4)
3.10
indirect test

test performed by or on behalf of the manufacturer, different from that specified test for that particular

characteristic, having previously verified its correlation with the specified test

3.11
witness test

test accepted by an inspection or a certification body (3.1) for type testing (3.6) 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 (3.1), qualified in testing
3.12
material

composition grouped by specific families, expressed by generic names used in various standards, e.g.

PP-H, PB-R, PE-RT Type II, PE-X a
3.13
compound

clearly defined homogenous mixture of the 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 (3.16)
3.14
material grade
material (3.12) with a defined specification from a material manufacturer
3.15
batch of material grade

clearly identified quantity of a given homogeneous material (3.12) or compound (3.13) manufactured

under uniform conditions and defined and identified by the material/compound manufacturer

3.16
product

pipe, fitting, or valve of a clearly identified type intended to be a part of a piping system which the

manufacturer puts on the market
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ISO/TS 22391-7:2018(E)
3.17
product batch

clearly identified collection of units or products (3.16), manufactured consecutively or continuously

under the same conditions, using the same compounds (3.13) conforming to the same specifications

Note 1 to entry: The production batch is defined and identified by the product manufacturer.

3.18
lot
clearly identifiable sub-division of a batch for inspection purposes
3.19
sample

one or more units or products (3.16) drawn from the same production batch or lot (3.18), selected at

random without regard to their quality
Note 1 to entry: The number of products (3.16) in the sample is the sample size.
3.20
group

collection of similar components (3.21) or products (3.16) from which samples (3.19) are selected for

testing purposes
3.21
component

product (3.16) manufactured out of a specific compound (3.13), brought to the market as part of another

product (3.16) or as a spare part

Note 1 to entry: For drinking water application, components may be considered as products (3.16) and be

individually approved (e.g. o-ring, gasket) or they are tested as integral part of a product (3.16) (e.g. in a valve).

3.22
joint
connection between two or more products (3.16)
3.23
assembly/assembled product
assembled product using two or more parts
3.24
sampling plan

specific plan which defines the test and the number of units or products (3.16) or assemblies (3.23) to be

inspected
3.25
product type
generic description of a product (3.16)

EXAMPLE A pipe or fitting or valve or their main parts, of the same design, from a particular compound (3.13).

3.26
cavity
(moulding) space within a mould to be filled to form the moulded product

EXAMPLE That part of an injection mould which gives the form to the injection-moulded product.

4 Abbreviated terms

To avoid misunderstanding, the abbreviations in this clause are defined as being the same in each

language. For the same reason, the terms are given in the three languages, English, French and German.

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ISO/TS 22391-7:2018(E)
EN FR DE
AT audit test essai d’audit Überwachungsprüfung
BRT batch release test essai de libération de campagne Freigabeprüfung einer
de fabrication Charge
IT indirect test essai indirect indirekte Prüfung
PVT process verification essai de vérification du procédé Prozessüberprüfung
test de fabrication
TT type test essai de type Typprüfung
WT witness testing essai témoin Prüfung unter Aufsicht
5 General

Compounds, products and assemblies shall conform to the requirements given in all parts of ISO 22391.

Products and assemblies shall be produced by the manufacturer under a quality management system

which includes a quality plan.

For the effect on water quality, attention is drawn to the requirements of national regulations.

6 Testing and inspection
6.1 Grouping
6.1.1 General
For the purposes of this document, the groups specified in 6.1.2 to 6.1.4 apply.
6.1.2 Pressure groups
Two pressure groups are defined, as given in Table 1.
Table 1 — Pressure groups
Pressure group Operating pressure, p
bar
1 4; 6
2 8; 10
6.1.3 Size groups
Two size groups are defined for pipes and fittings, as given in Table 2.
Table 2 — Size groups
Size group Nominal diameter, d
1 10 ≤ d ≤ 63
2 63 < d ≤ 160
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ISO/TS 22391-7:2018(E)
6.1.4 Fitting groups

Two groups of fittings each having a similar design are defined, as given in Table 3.

Table 3 — Fitting groups
Fitting group Type of fitting
1 Elbows, tees, reducers, couplers, end caps

2 Unions, flange adaptors, transition fittings, adaptor pieces and/or their plastics parts and others

6.2 Type testing (TT)

Relevant TTs shall be carried out on new systems and whenever there is a change in design, compound,

production site or production method, other than routine in-process adjustments, and/or whenever

there is an extension of the product range.

TTs shall demonstrate that the products conform to all requirements for the characteristics given in

Table 5 to Table 7.

Conditions considered as leading to a change of compound (M) are given in Table 4. The dosage level

of ingredients of the compound shall not exceed the tolerance bands given in Table 4. The values (see

Table 4) shall be specified by the manufacturer in his quality plan. The relevant characteristics to be

tested in case of change of compound are given in Tables 5, 6 and 7 in columns M1A to M2C, as applicable.

A change in the supplier of stabilizer or other additives does not necessarily constitute a change in

compound (see Table 4, footnote .

A change of material of metal fittings without any change of design in those areas which are relevant to

the joint performance does not require testing as specified in ISO 22391-5.
Table 4 — Conditions considered to lead to a change of compound (M)
Conditions A B C
Polymer Thermal stabilizer Other additives, e.g.
used in the compound pigments etc.
to manufacture a product
a,b

M1 Change of material — Full TT of the product — Full TT of the product — Reduced TT of

grade the product
— System test required — No system test
required — No system tests
required
e c
M2 Change of amount — Reduced TT of the — Reduced TT of
of any stabilizer, product the product
or other additives
— No system test — No system tests
greater than ±30 %
required required

Stabilizer, pigments or other additives with identical CAS number are considered as identical substances.

The case of adding pigments to fully stabilized natural (not pigmented) material grade is covered by M1C.

Not applicable.
Stabilizers which affect the thermal stability of the compound.

Changes of the amount of stabilizer, peroxides and other additives equal or less than ±30 % requires no testing.

For the purposes of defining a change in design, the following characteristics are relevant.

a) dimensions;
b) geometry of the product;
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ISO/TS 22391-7:2018(E)
c) jointing system.

In the manufacturer’s quality plan, the geometry, the dimensions and the dimensional tolerances shall

be specified at least in accordance with and in addition to the requirements given in the relevant Part(s)

of ISO 22391.

If one or more of these characteristics exceed the defined specifications, the relevant characteristics

given in Table 5 to Table 7, as applicable, shall be retested.

Barrier pipes tests according to Table 5 are made on the base pipe (without barrier layers) in case of

dispute.

Barrier layer pipes tests according to Table 7 shall be made on the full pipe including any barrier layers.

In case of extension of the product range (E) the relevant characteristics given in Table 5 to Table 7, as

applicable shall be tested.

In case of a change of production site of a product (pipe/fitting) (P), the relevant characteristics given

in column P of Table 5 to Table 7, as applicable, shall be tested.

NOTE 1 Testing is not required in case of changes (M, E) for a product (pipes, fittings) manufactured at an

alternative production site provided that these changes (M, E) have been evaluated according to this document

for the same product (pipe, fitting) at an equivalent and evaluated production site and provided that the

production process of the product is equivalent.

In case of change of a production site of a material grade, the supplier shall ensure that the material

grade is identical. Additional type testing of products (pipe/fitting) is not required.

Table 5 — Characteristics of pipes that require type testing (TT)
Conditions requiring test Evaluation procedure
Characteristic Reference
Certification
N M1A M1B M1C M2B M2C E P Manufacturer
body
Influence on water ISO 22391-
intended for human 1:2009, 5.2 According to national regulations
consumption
c c d d d d d
Hydrostatic stress ISO 22391- + + + + + + − + 1 evaluation per Evaluation
properties of mate- 2:2009, 4.2 compound checked by certi-
rial fication body
Appearance ISO 22391- + + + + + + + + 1 test piece of 1 test piece of 1
2:2009, 5.1 each diameter one diameter/
and pressure size group and
group pressure group
Opacity ISO 22391- + + + + − + + + 1 test piece of 1 test piece of
2:2009, 5.2 the smallest the smallest
wall thickness wall thickness
produced produced
Dimensions ISO 22391- + + + + + + + + 1 test piece of 1 test piece of 1
2:2009, Tables each diameter diameter/size
3 to 7 and pressure group and pres-
group sure group

Resistance to inter- ISO 22391- + + + + + + + + 3 test pieces of 3 test pieces of

nal pressure 2:2009, Tables 1 diameter/size 1 diameter/size
8 to 9 group and pres- group and pres-
sure group sure group
Longitudinal rever- ISO 22391- + + + + + + + + 3 test pieces of 3 test pieces of
sion 21:2009, Table 1 diameter/size 1 diameter/size
10 group and pres- group and pres-
sure group sure group
Melt flow rate ISO 22391- + + + + + + + + 3 test pieces of 3 test pieces of
2:2009, Table 1 diameter/size 1 diameter/size
10 group group
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ISO/TS 22391-7:2018(E)
Table 5 (continued)
Conditions requiring test Evaluation procedure
Characteristic Reference
Certification
N M1A M1B M1C M2B M2C E P Manufacturer
body
Thermal stability ISO 22391- + + + + + − − + 1 test piece per 1 test piece per
2:2009, Table compound compound
Marking ISO 22391- + − − − − − + + 1 test piece of 1 test piece of 1
2:2009, Clause each diameter diameter/size
10 and pressure group and pres-
group sure group
N : new system;
M1 : change of material grade; see Table 4;

M2 : change of amount of any stabilizers or other additives greater than ±30 %, see Table 4;

E : extension of the product range (except the products already covered by the scheme of sampling procedure);

P : change of production site of the pipes and fittings made of the same compounds to an existing product location, provided that the

production process is equivalent;
+ : test to be carried out.

Recommended sampling procedure for a testing laboratory working for or on behalf of a certification body. Testing undertaken in a

manufacturer's laboratory can be taken into account, by prior agreement with the certification body.

If the material manufacturer/supplier has already evaluated the hydrostatic stress properties specified in ISO 22391-2:2009 (see also

[7]

ISO 9080 ), by means of a test report of an accredited testing laboratory, the manufacturer of pipes shall conduct the conformity test-

ing (2 500 h/95 °C) according to footnote only.

Conformity testing of the compound: In order to check the conformity of the compound on the hydrostatic stress properties specified

in ISO 22391-2:2009, three test pieces shall be tested at two different stress levels at 95 °C. The lowest stress level shall give failure times

of approximately 2 500 h. All failure points shall be on or above the relevant reference curve of ISO 22391-2:2009, Figure 1 or Figure 2.

If extension includes smaller wall thickness than current range.
Table 6 — Characteristics of fittings that require type testing (TT)
Conditions requiring test Evaluation procedure
Character-
M1A
Reference
Manufac- Certification
istic
N D or M1C M2B M2C E P
turer body
M1B
Influence on ISO 22391-
water intend- 1:2009, 5.2
According to national regulations
ed for human
consumption
c c d d d
Hydro- ISO 22391- + − + + + + − − 1 evaluation Evaluation
static stress 3:2009, 4.1 per com- checked by
properties of pound certification
material body
e e,h e e,h e,g,h
Thermal sta-
...