EN ISO 21003-3:2008/A1:2021

Multilayer piping systems for hot and cold water installations inside buildings - Part 3: Fittings - Amendment 1 (ISO 21003-3:2008/Amd 1:2021)

Mehrschichtverbund-Rohrleitungssysteme für die Warm- und Kaltwasserinstallation innerhalb von Gebäuden - Teil 3: Formstücke - Änderung 1 (ISO 21003-3:2008/Amd 1:2021)

No scope available

Systèmes de canalisations multicouches pour installations d'eau chaude et froide à l'intérieur des bâtiments - Partie 3: Raccords - Amendement 1 (ISO 21003-3:2008/Amd 1:2021)

Večslojni cevni sistemi za napeljave z vročo in hladno vodo v stavbah - 3. del: Fitingi - Dopolnilo A1 (ISO 21003-3:2008/Amd 1:2021)

General Information

• Status: Published
• Publication Date: 26-Oct-2021
• Withdrawal Date: 29-Apr-2022
• ICS: 23.040.45 - Plastics fittings
• ICS: 91.140.60 - Water supply systems
• Technical Committee: CEN/TC 155 - Plastics piping systems and ducting systems
• Drafting Committee: CEN/TC 155/WG 16 - Systems for hot and cold water applications
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 27-Oct-2021
• Due Date: 28-Jun-2022
• Completion Date: 27-Oct-2021
• Ref Project: SIST EN ISO 21003-3:2009/A1:2021 - Multilayer piping systems for hot and cold water installations inside buildings - Part 3: Fittings - Amendment 1 (ISO 21003-3:2008/Amd 1:2021)

Relations

• Amends: EN ISO 21003-3:2008 - Multilayer piping systems for hot and cold water installations inside buildings - Part 3: Fittings (ISO 21003-3:2008)
• Effective Date: 22-Apr-2020

Overview

EN ISO 21003-3:2008/A1:2021 - "Multilayer piping systems for hot and cold water installations inside buildings - Part 3: Fittings - Amendment 1" is a CEN-endorsed amendment (approved October 2021) to ISO 21003-3:2008. It updates requirements for fittings used with multilayer piping systems for potable hot and cold water inside buildings, clarifying material, dimensional, corrosion and test requirements and adding a new tightness test and minimum wall thickness criteria for metallic (mainly copper-alloy) fittings.

Key topics and technical requirements

• Scope of fittings: Revised definition of a fitting as a component that connects two or more pipes/fittings; examples include compression, radial/axial press, flanged, push‑fit and fusion fittings.
• Metallic materials: Metallic fittings for ISO 21003 systems shall be copper alloys or stainless steels, defined by an appropriate standard or regulatory document. Copper-alloy fittings must meet specified corrosion resistance rules.
• Corrosion and dezincification:
  • Resistance to stress corrosion required for copper-alloy fittings. Certain alloys (CuSnZnPb, CuZn‑Si ≥2% Si) and CuZn alloys with hardness HBW 2,5/62,5 ≤ 110 are deemed resistant without additional testing.
  • Other copper alloys with ≥10% Zn require ISO 6957 testing (pH 9.5 ammonia test) with no cracking allowed.
  • Dezincification testing per ISO 6509-1 is required where a fitting is declared dezincification‑resistant; acceptance: max depth ≤ 200 µm, average ≤ 100 µm.
• Appearance and dimensional control:
  • Plastic fittings: surfaces must be smooth/clean; dimensions measured per ISO 3126.
  • Metal fittings: clean, no sharp edges; dimensions measured per ISO 2768-1 and/or ISO 22081.
• Minimum wall thickness: Annex B (normative) defines measurement points (A, B, C) and a table of minimum wall thickness values for machined/wrought and cast copper-alloy fittings across nominal diameters.
• Tightness test for cast fittings: New Clause 12 requires leak-tightness testing of cast fittings after machining - e.g., compressed air ≥ 0.5 MPa (5 bar) while immersed in water (bubbles = leak). Alternative methods may be applied.
• Sealing elements: Materials must not harm pipes/fittings and shall conform to ISO 21003-5 and EN 681‑1/2 as applicable.

Applications and users

This amendment is essential for:

• Manufacturers of multilayer piping fittings (compression, press, push-fit, fusion)
• Product designers and R&D ensuring material selection and dimensional compliance
• Testing laboratories and certification bodies performing corrosion, dezincification and tightness tests
• Plumbing engineers, specifiers and installers who require compliant fittings for hot/cold water systems in buildings
• Regulators and standards committees harmonizing national adoption (CEN members to implement by April 2022)

Related standards (normative/important references)

• ISO 3126, ISO 2768-1, ISO 22081, ISO 6506-1, ISO 6509-1, ISO 6957, ISO 21003-5, EN 681-1/2, ISO 6509-2, ISO/TS 21003-7. Note: EN 1254-3 was deleted from the normative references in this amendment.

This amendment helps ensure robust, corrosion-resistant fittings and consistent dimensional and testing practices for safe, long‑lasting multilayer hot and cold water installations.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2021
Večslojni cevni sistemi za napeljave z vročo in hladno vodo v stavbah - 3. del:
Fitingi - Dopolnilo A1 (ISO 21003-3:2008/Amd 1:2021)
Multilayer piping systems for hot and cold water installations inside buildings - Part 3:
Fittings - Amendment 1 (ISO 21003-3:2008/Amd 1:2021)
Mehrschichtverbund-Rohrleitungssysteme für die Warm- und Kaltwasserinstallation
innerhalb von Gebäuden - Teil 3: Formstücke - Änderung 1 (ISO 21003-3:2008/Amd
1:2021)
Systèmes de canalisations multicouches pour installations d'eau chaude et froide à
l'intérieur des bâtiments - Partie 3: Raccords - Amendement 1 (ISO 21003-3:2008/Amd
1:2021)
Ta slovenski standard je istoveten z: EN ISO 21003-3:2008/A1:2021
ICS:
23.040.45 Fitingi iz polimernih Plastics fittings
materialov
91.140.60 Sistemi za oskrbo z vodo Water supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 21003-3:2008/A1
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2021
EUROPÄISCHE NORM
ICS 91.140.60; 23.040.45
English Version
Multilayer piping systems for hot and cold water
installations inside buildings - Part 3: Fittings -
Amendment 1 (ISO 21003-3:2008/Amd 1:2021)
Systèmes de canalisations multicouches pour Mehrschichtverbund-Rohrleitungssysteme für die
installations d'eau chaude et froide à l'intérieur des Warm- und Kaltwasserinstallation innerhalb von
bâtiments - Partie 3: Raccords - Amendement 1 (ISO Gebäuden - Teil 3: Formstücke - Änderung 1 (ISO
21003-3:2008/Amd 1:2021) 21003-3:2008/Amd 1:2021)
This amendment A1 modifies the European Standard EN ISO 21003-3:2008; it was approved by CEN on 1 October 2021.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This amendment exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.

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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21003-3:2008/A1:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 21003-3:2008/A1:2021) has been prepared by Technical Committee ISO/TC
138 "Plastics pipes, fittings and valves for the transport of fluids" in collaboration with Technical
Committee CEN/TC 155 “Plastics piping systems and ducting systems” the secretariat of which is held
by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by April 2022, and conflicting national standards shall be
withdrawn at the latest by April 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: 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, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 21003-3:2008/Amd 1:2021 has been approved by CEN as EN ISO 21003-
3:2008/A1:2021 without any modification.

INTERNATIONAL ISO
STANDARD 21003-3
First edition
2008-07-01
AMENDMENT 1
2021-10
Multilayer piping systems for hot
and cold water installations inside
buildings —
Part 3:
Fittings
AMENDMENT 1
Systèmes de canalisations multicouches pour installations d'eau
chaude et froide à l'intérieur des bâtiments —
Partie 3: Raccords
AMENDEMENT 1
Reference number
ISO 21003-3:2008/Amd.1:2021(E)
ISO 21003-3:2008/Amd.1:2021(E)
© ISO 2021
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 21003-3:2008/Amd.1:2021(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 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 collaboration
with the European Committee for Standardization (CEN) Technical Committee CEN/TC 155, Plastics
piping systems and ducting systems, in accordance with the Agreement on technical cooperation between
ISO and CEN (Vienna Agreement).
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.
iii
ISO 21003-3:2008/Amd.1:2021(E)
Multilayer piping systems for hot and cold water
installations inside buildings —
Part 3:
Fittings
AMENDMENT 1
Normative references
Add the following normative references:
ISO 2768-1, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual
tolerance indications
ISO 6506-1, Metallic materials — Brinell hardness test — Part 1: Test method
ISO 6509-1, Corrosion of metals and alloys — Determination of dezincification resistance of copper alloys
with zinc — Part 1: Test method
ISO 6957, Copper alloys — Ammonia test for stress corrosion resistance
ISO 22081, Geometrical product specifications (GPS) — Geometrical tolerancing — General geometrical
specifications and general size specifications

Delete the following normative reference:
EN 1254-3, Copper and copper alloys — Plumbing fittings — Part 3: Fittings with compression ends for use
with plastics pipes
Terms and definitions
Replace the existing definition 3.1 with the following:
...