Multilayer piping systems for hot and cold water installations inside buildings — Part 7: Guidance for the assessment of conformity

This document gives requirements and guidance for the assessment of conformity of compounds, products, and assemblies in accordance with the applicable part(s) of ISO 21003 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 of ISO 21003 (see Foreword), this document is applicable to multilayer 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 21003-1:2008, Table 1).

Systèmes de canalisations multicouches pour installations d'eau chaude et froide à l'intérieur des bâtiments — Partie 7: Guide pour l'évaluation de la conformité

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24-Apr-2019
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TECHNICAL ISO/TS
SPECIFICATION 21003-7
Second edition
2019-04
Multilayer piping systems for hot
and cold water installations inside
buildings —
Part 7:
Guidance for the assessment of
conformity
Systèmes de canalisations multicouches pour installations d'eau
chaude et froide à l'intérieur des bâtiments —
Partie 7: Guide pour l'évaluation de la conformité
Reference number
ISO/TS 21003-7:2019(E)
ISO 2019
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ISO/TS 21003-7:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© 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

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Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2019 – All rights reserved
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ISO/TS 21003-7:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Abbreviated terms and symbols .......................................................................................................................................................... 4

4.1 Abbreviated terms ............................................................................................................................................................................... 4

4.2 Symbols ......................................................................................................................................................................................................... 5

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 ............................................................................................................................................................................ 6

6.1.4 Fitting groups ..................................................................................................................................................................... 6

6.2 Type testing ............................................................................................................................................................................................... 6

6.3 Batch release test ...............................................................................................................................................................................15

6.4 Process verification tests (PVTs) ..........................................................................................................................................16

6.5 Audit tests (AT) ....................................................................................................................................................................................17

6.6 Indirect testing (IT)..........................................................................................................................................................................17

6.7 Test records.............................................................................................................................................................................................18

Annex A (informative) Interchangeability of different material grades — Testing of

alternative material grades for a layer in a multilayer M-pipe (second sourcing) .......................19

Bibliography .............................................................................................................................................................................................................................31

© ISO 2019 – All rights reserved iii
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ISO/TS 21003-7:2019(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 on 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 the following

URL: 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 21003-7:2008), which has been

technically revised. It also incorporates the Amendment ISO/TS 21003-7:2008/Amd1: 2010.

The major technical changes are:
— New definition of the terms “material”, “material grade” and “compound”;
— Revision of 6.2 “type testing”;

— Addition of Annex A "Interchangeability of different material grades — Testing of an alternative

material grades for a layer in a Multilayer M-Pipe (second sourcing)”.
A list of all parts in the ISO 21003 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
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ISO/TS 21003-7:2019(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 21003.

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 — Crosslinked 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 22391, Plastics piping systems for hot and cold water installations — Polyethylene of raised

temperature resistance (PE-RT)

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 compounds, pipes, fittings, joints or assemblies by

manufacturers, including certification, is given in Figure 2.
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ISO/TS 21003-7:2019(E)

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

including certification.
vi © ISO 2019 – All rights reserved
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TECHNICAL SPECIFICATION ISO/TS 21003-7:2019(E)
Multilayer piping systems for hot and cold water
installations inside buildings —
Part 7:
Guidance for the assessment of conformity
1 Scope

This document gives requirements and guidance for the assessment of conformity of compounds,

products, and assemblies in accordance with the applicable part(s) of ISO 21003 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 of ISO 21003 (see Foreword), this document is applicable to

multilayer 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 21003-1:2008, 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 17456, Plastics piping systems — Multilayer pipes — Determination of long-term strength

ISO 21003-1, Multilayer piping systems for hot and cold water installations inside buildings — Part 1: General

ISO 21003-2, Multilayer piping systems for hot and cold water installations inside buildings — Part 2: Pipes

ISO 21003-3, Multilayer piping systems for hot and cold water installations inside buildings — Part 3:

Fittings

ISO 21003-5, Multilayer piping systems for hot and cold water installations inside buildings — 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 21003-1, ISO 21003-3 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
© ISO 2019 – All rights reserved 1
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ISO/TS 21003-7:2019(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

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

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
[1]

Note 1 to entry: Requirements for quality management systems are given in ISO 9001 .

[6]
[SOURCE: ISO 9000:2015 , 3.5.4, modified — Note 1 to entry has been added]
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, component, product, joint or assembly 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 or product or assembly

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 material compound, components or

products, 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 product manufacturer on compounds, components, products or

joints at specific intervals to confirm that the process continues to be capable of producing components

and products which conform to the requirements given in the relevant standard

Note 1 to entry: Such tests are not required to release batches of materials, compound, components or products

and are carried out as a measure of process control
2 © ISO 2019 – All rights reserved
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ISO/TS 21003-7:2019(E)
3.9
audit test

test performed by a test laboratory on behalf of an inspection body or certification body to confirm

that the material, compound, components, product, 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

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 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

composition grouped by families, expressed by generic names used in material standards, e.g. PP-H, PB-

R, PE-RT Type II, PE-Xa, aluminium alloy type 8006
3.13
material grade
material with a defined specification from a material manufacturer
3.14
alternative material grade

material grade available for the production of a multilayer pipe, but different from the one used in the

type test (second sourcing)

Note 1 to entry: The pipe manufacturer might have alternative material grades for the inner layer, inner adhesive

layer, metal layer, outer adhesive layer and/or outer layer of the multilayer pipe.

3.15
compound

clearly defined homogenous 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

3.16
batch of material grade

clearly identified quantity of a given homogeneous materials or compound manufactured under

uniform conditions and defined and identified by the materials or compound manufacturer

3.17
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
3.18
product batch

clearly identified collection of units or products, manufactured consecutively or continuously under the

same conditions, using the same compounds conforming to the same specifications

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

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ISO/TS 21003-7:2019(E)
3.19
lot
clearly identifiable sub-division of a batch for inspection purposes
3.20
sample

one or more units or products drawn from the same production batch or lot, selected at random without

regard to their quality
Note 1 to entry: The number of products in the sample is the sample size.
3.21
group

collection of similar components from which samples are selected for testing purposes

3.22
component

product manufactured out of a specific material or compound, brought to the market as part of another

product or as a spare part

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

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

3.23
joint
connection between two or more products
3.24
assembly/assembled product
product consisting of two or more parts
3.25
sampling plan

specific plan, which defines the test and the number of units or products or assemblies to be inspected

3.26
product type
generic description of a product

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

3.27
cavity
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 and symbols
4.1 Abbreviated terms

To avoid misunderstanding, the abbreviated terms 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.

EN FR DE
AT audit test essai d’audit Überwachungsprüfung
essai de libération de campagne de fab-
BRT batch release test Freigabeprüfung einer Charge
rication
IT indirect test essai indirect indirekte Prüfung
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ISO/TS 21003-7:2019(E)
EN FR DE
essai de vérification du procédé de fab-
PVT process verification test Prozessüberprüfung
rication
TT type test essai de type Typprüfung
WT witness testing essai témoin Prüfung unter Aufsicht
4.2 Symbols
I Material grade used in the inner layer of the initial type-tested M-pipe

Ai Material grade used in the inner adhesive layer of the initial type-tested M-pipe

M Material grade used in the metal layer of the initial type-tested M-pipe

Ao Material grade used in the outer adhesive layer of the initial type-tested M-pipe

O Material grade used in the outer layer of the initial type-tested M-pipe
I Alternative material grade to be introduced in the inner layer
Ai Alternative material grade to be introduced in the inner adhesive layer
M Alternative material grade to be introduced in the metal layer
Ao Alternative material grade to be introduced in the outer adhesive layer
O Alternative material grade to be introduced in the outer layer
5 General

Compounds, products and assemblies shall conform to the requirements given of ISO 21003 (all parts).

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

which includes a quality plan.
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
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ISO/TS 21003-7:2019(E)
6.1.3 Size groups
Three 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 ≤ 26
2 26 < d ≤ 63
3 d > 63
6.1.4 Fitting groups
Two groups of fittings 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
Unions, flange adaptors, transition fitting, adaptor pieces
and/or their plastics parts and others
6.2 Type testing

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.

Type tests shall demonstrate that the products conform to all requirements for the characteristics

given in Table 6 to Table 10, as applicable.

Conditions considered as leading to a change of compound (M) of M-pipes and P-pipes are given in

Tables 4 and 5. Tables 4 and 5 offer a wide range of changes.
NOTE 1
— Example 1: A change of the inner layer material from PE-Xa to PERT Type II

— Example 2: A change of the metal layer material from an aluminium alloy type 8006 to a different aluminium

alloy type or even to a steel alloy.

— Example 3: A change of a material grade used for the inner layer to another material grade from another raw

material supplier.

The relevant characteristics to be tested in case of change of compound of M-pipes and P-pipes are

given in Tables 6, 7 and 10 in columns M1 –M5, as applicable.

However, combinations of such compound changes are not covered by Tables 6, 7 and 10. In case of a

combination of compound changes of a pipe, a full type testing is required, if Annex A (see below) is not

applicable.

A special case, similar to change of compound, but with a different intention is described in Annex A.

Annex A defines the testing of second sourcing material grades. It describes a qualified test scheme

to test the interchangeability of a currently used material grade for a layer of an initial type-tested

multilayer pipe by an alternative material grade intended to be used for this layer of this pipe. The

testing does not only ensure the interchangeability of a material grade for one layer, it covers also

all possible combinations, which can occur in the production later on, when for each layer the initial

material grade and a positive tested alternative material grade can be used.
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ISO/TS 21003-7:2019(E)

The characteristics to be tested in case of change of compound (M) of plastic fittings are listed in Table 8

in columns M1 – M2 and in Table 10 in column MF, as applicable.

NOTE 2 The characteristics to be tested are applicable also for plastic fittings made of other polymer material

(e.g. PPSU, PSU, PVDF) than those materials specified in the relevant product standards.

The relevant characteristics to be tested in case of change of a metal fitting are given in Tables 9 and 10,

as applicable. A change of material of metal fittings without any change of design in those areas, which

are relevant to the joint performance, requires no testing as specified in ISO 21003-5.

Table 4 — Conditions considered to lead to a change of compound (M) for M-pipes
Type of change Conditions
Defined in Part 7 of the relevant reference product standard
where for M-pipes in this document only the specific “M1A”
change (change of polymer) is applicable.
Change of inner layer (M1)
All other “M” changes in the relevant reference product stand-
ards for the inner layer compound are assumed to be covered in
accordance with parts 7 of those relevant product standard (on
mono layer pipes).
Change of supplier
Change of inner adhesive layer (M2) Change of formulation
Change of chemical nature
Change of supplier
Change of metal (M3) Change of alloy/composition
Change of welding system
Change of supplier
Change of outer adhesive layer (M4) Change of formulation
Change of chemical nature
Change of supplier
Change of outer layer (M5) Change of formulation
Change of chemical nature

Inner layers are the layers in direct contact with the conveyed fluid and all other (stress designed) layers on the inner

side of the metal layer.

Inner adhesive layers are all layers applied as thin bonding layers on the inner side of the metal layer.

Outer adhesive layers are all layers applied as thin bonding layer on the outer side of the metal layer.

Outer layers are all layers applied on the outer side of the metal layer which could be non-stress designed layers. For

stress designed outer layers the M1 procedure applies.
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ISO/TS 21003-7:2019(E)
Table 5 — Conditions considered to lead to a change of compound (M) for P-pipes
Type of change Conditions
Defined in Part 7 of the relevant reference product standard
where for M-Pipes in this document only the specific “M1A”
change (change of polymer) is applicable. (For PVC-C M1 ap-
Change of inner layer (M1)
plies.) All other “M” changes for the inner layer compound are
assumed to be covered in accordance with the parts 7 of the
relevant product standard (on mono layer pipes).
Change of supplier
Change of inner adhesive layer (M2) Change of formulation
Change of chemical nature
Change of supplier
Change of application (functional) layer (M3) Change of formulation
Change of chemical nature
Change of supplier
Change of outer adhesive layer (M4) Change of formulation
Change of chemical nature
Change of supplier
Change of (outer) plastics layer (M5) Change of formulation
Change of chemical nature

Inner layers are the layers in direct contact with the conveyed fluid and all other (stress designed) layers on the inner

side of the functional layer.

Inner adhesive layers are all layers applied as thin bonding layers on the inner side of the functional layer.

Outer adhesive layers are all layers applied as thin bonding layers on the outer side of the functional layer.

Outer layers are all layers applied on the outer side of the functional layer which could be non-stress designed layers.

For stress designed outer layers the M1 procedure applies.

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

a) dimensions;
b) geometry of the product;
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 21003. If one or more of these characteristics exceed the defined specifications, the relevant

characteristics given in Table 6 to Table 10, as applicable, shall be retested.

In case of extension of the product range (E), the relevant characteristics given in Table 6 to Table 10, 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 6 to Table 10, as applicable, shall be tested.

NOTE 1 As an exception, no testing is required in case of changes (M, E) for a product (pipes/fittings)

manufactu
...

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