EN ISO 16486-3:2020

SLOVENSKI STANDARD
01-november-2020
Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Cevni sistemi
iz nemehčanega poliamida (PA-U) z zvari in mehanskimi spoji - 3. del: Fitingi (ISO
16486-3:2020)
Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U)
piping systems with fusion jointing and mechanical jointing - Part 3: Fittings (ISO 16486-
3:2020)
Kunststoff-Rohrleitungssysteme für die Gasversorgung - Rohrleitungssysteme aus
weichmacherfreiem Polyamid (PA-U) mit Schweißverbindungen und mechanischen
Verbindungen - Teil 3: Formstücke (ISO 16486-3:2020)
Systèmes de canalisations en matières plastiques pour la distribution de combustibles
gazeux - Systèmes de canalisations en polyamide non plastifié (PA-U) avec
assemblages par soudage et assemblages mécaniques - Partie 3: Raccords (ISO 16486
-3:2020)
Ta slovenski standard je istoveten z: EN ISO 16486-3:2020
ICS:
75.200 Oprema za skladiščenje Petroleum products and
nafte, naftnih proizvodov in natural gas handling
zemeljskega plina equipment
83.140.30 Polimerne cevi in fitingi za Plastics pipes and fittings for
snovi, ki niso tekočine non fluid use
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 16486-3
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2020
EUROPÄISCHE NORM
ICS 75.200; 83.140.30
English Version
Plastics piping systems for the supply of gaseous fuels -
Unplasticized polyamide (PA-U) piping systems with
fusion jointing and mechanical jointing - Part 3: Fittings
(ISO 16486-3:2020)
Systèmes de canalisations en matières plastiques pour Kunststoff-Rohrleitungssysteme für die Gasversorgung
la distribution de combustibles gazeux - Systèmes de - Rohrleitungssysteme aus weichmacherfreiem
canalisations en polyamide non plastifié (PA-U) avec Polyamid (PA-U) mit Schweißverbindungen und
assemblages par soudage et assemblages mécaniques - mechanischen Verbindungen - Teil 3: Formstücke
Partie 3: Raccords (ISO 16486-3:2020) (ISO/FDIS 16486-3:2020)
This European Standard was approved by CEN on 21 September 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a 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 European Standard 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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16486-3:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Annex (informative)  A-deviation . 4

European foreword
This document (EN ISO 16486-3:2020) 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 March 2021, and conflicting national standards shall
be withdrawn at the latest by March 2021.
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.
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 16486-3:2020 has been approved by CEN as EN ISO 16486-3:2020 without any
modification.
Annex
(informative)
A-deviation
A-deviation: National deviation due to regulations, the alteration of which is for the time being outside the competence of the CEN-CENELEC
national member.
This European Standard does not fall under any Directive of the EU.
In the relevant CEN-CENELEC countries these A-deviations are valid instead of the provisions of the European Standard until they have been
removed.
Country Clause Deviation
ITALY §1 According to Italian legislation concerning the safety of gas installation
Scope
- DM 16 April 2008 (DSO) prescribes that piping and components used in distribution system shall be in accordance with national
standard UNI 9034 (pipes with MOP below 5 bar). In case of MOP greater than 5 bar DM 17 April 2008 shall be followed.
th
(Official Journal Italian Republic GU n. 107 of 8 May 2008
https://www.gazzettaufficiale.it/eli/id/2008/05/08/08A02871/sg)
- DM 17 April 2008 (TSO) prescribes that piping and components used in transmission system shall be made of steel (art. 3.1 of
Technical Annex A to Decree).
th
(Official Journal Italian Republic GU n. 107 of 8 May 2008
https://www.gazzettaufficiale.it/atto/serie_generale/caricaDettaglioAtto/originario?atto.dataPubblicazioneGazzetta=2008-05-
08&atto.codiceRedazionale=08A02872&elenco30giorni=false)

INTERNATIONAL ISO
STANDARD 16486-3
Second edition
2020-09
Plastics piping systems for the supply
of gaseous fuels — Unplasticized
polyamide (PA-U) piping systems
with fusion jointing and mechanical
jointing —
Part 3:
Fittings
Systèmes de canalisations en matières plastiques pour la distribution
de combustibles gazeux — Systèmes de canalisations en polyamide
non plastifié (PA-U) avec assemblages par soudage et assemblages
mécaniques —
Partie 3: Raccords
Reference number
ISO 16486-3:2020(E)
©
ISO 2020
ISO 16486-3:2020(E)
© ISO 2020
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 2020 – All rights reserved

ISO 16486-3:2020(E)
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Material . 3
4.1 PA-U compound . 3
4.2 Material for non-unplasticized polyamide parts . 3
4.2.1 General. 3
4.2.2 Metal parts . 4
4.2.3 Elastomers . 4
4.2.4 Other materials . 4
5 General characteristics . 4
5.1 Appearance . 4
5.2 Design . 4
5.3 Colour . 4
5.4 Electrical characteristics for electrofusion fittings . 4
5.5 Appearance of factory-made fusion joints . 5
5.6 Fusion compatibility . 5
5.7 Appearance of transition fittings. 5
6 Geometrical characteristics . 6
6.1 Measurement of dimensions . 6
6.2 Dimensions of electrofusion sockets . 6
6.2.1 Diameters and lengths of electrofusion sockets . 6
6.2.2 Wall thickness . 6
6.3 Dimensions of spigot end fittings . 8
6.4 Dimensions of tapping tees .10
6.5 Dimensions of transition fittings to other materials .11
7 Mechanical characteristics .11
7.1 General .11
7.2 Conditioning .11
7.3 Mechanical requirements .11
7.4 Additional requirements for transition fittings .14
8 Physical characteristics .14
8.1 Conditioning .14
8.2 Requirements .14
9 Chemical resistance of fittings in contact with chemicals .14
10 Performance requirements .14
11 Marking .15
11.1 General .15
11.2 Minimum required marking of fittings .15
11.3 Additional information required on fitting or label .15
11.4 Fusion system recognition .16
12 Delivery conditions .16
Annex A (informative) Examples of typical terminal connections for electrofusion .17
Annex B (normative) Short-term pressure test method .19
Annex C (normative) Tensile test fitting/pipe assemblies .21
ISO 16486-3:2020(E)
Bibliography .23
iv © ISO 2020 – All rights reserved

ISO 16486-3:2020(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 4, Plastics pipes and fittings for the supply of gaseous fuels,
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).
This second edition cancels and replaces the first edition (ISO 16486-3:2012), which has been
technically revised. It also incorporates ISO 16486-3:2012/Amd 1:2014.
The main changes compared to the previous edition are as follows:
— In subclause 5.7, text concerning the exceptional use of flange adaptors is added;
— In Table 1, electro fusion socket length has been revised and the diameter range extended;
— Tables 1 and 3 are extended with nominal outside diameters up to and including 630 mm;
— Tables 3 to 5 have been reordered;
— An editorial mistake of 6 hours has been changed to 16 hours for conditioning before hydrostatic
strength testing in Table 4 and before internal pressure testing in Table 5;
— A NOTE to Table 6 and a footnote in Table 7 have been added to explain the limited use of MVR;
— For transition fittings, the reference to ISO 17885 has been introduced;
1)
— For Fusion system recognition, reference is made to ISO 13950 and ISO 12176-4 and ISO 12176-5 ;
— The title of Clause 12 has changed from "Packaging" to "Delivery conditions”.
A list of all parts in the ISO 16486 series can also be found on the ISO website.
1) Under preparation. Stage at the time of publication: ISO/FDIS 12176-5:2020.
ISO 16486-3:2020(E)
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.
vi © ISO 2020 – All rights reserved

ISO 16486-3:2020(E)
Introduction
This document specifies the requirements for a piping system and its components made from
unplasticized polyamide (PA-U), which is intended to be used for the supply of gaseous fuels.
Requirements and test methods for material and components, other than fittings of the piping system,
are specified in ISO 16486-1, ISO 16486-2, and ISO 16486-4.
Characteristics for fitness for purpose of the system and generic fusion parameters are covered in
ISO 16486-5.
Recommended practice for installation is given in ISO 16486-6, which will not be implemented as a
European Standard under the Vienna Agreement.
2)
Assessment of conformity of the system is to form the subject of future ISO/TS 16486-7 .
NOTE Recommended practice for installation is also given in CEN/TS 12007-6, which has been prepared by
Technical Committee CEN/TC 234, Gas infrastructure.
Parts 1 to 7 of the ISO 16486 series have been prepared by ISO/TC 138/SC 4, with the exception of Part
4, which has been prepared by ISO/TC 138/SC 7.
2) Under preparation. Stage at the time of publication: ISO/WD TS 16486-7:2020.
INTERNATIONAL STANDARD ISO 16486-3:2020(E)
Plastics piping systems for the supply of gaseous fuels —
Unplasticized polyamide (PA-U) piping systems with fusion
jointing and mechanical jointing —
Part 3:
Fittings
1 Scope
This document specifies the physical and mechanical properties of fittings made from unplasticized
polyamide (PA-U) in accordance with ISO 16486-1, intended to be buried and used for the supply of
gaseous fuels.
It also specifies the test parameters for the test methods to which it refers.
The ISO 16486 series is applicable to PA-U piping systems, the components of which are connected by
fusion jointing and/or mechanical jointing.
In addition, it lays down dimensional characteristics and requirements for the marking of fittings.
In conjunction with the other parts of the ISO 16486 series, this document is applicable to PA-U fittings,
their joints, joints with components of PA-U and joints with mechanical fittings of other materials, and
to the following fitting types:
— fusion fittings (electrofusion fittings and butt fusion fittings), and
— transition fittings.
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 291, Plastics — Standard atmospheres for conditioning and testing
ISO 307, Plastics — Polyamides — Determination of viscosity number
ISO 1133-2, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR)
of thermoplastics — Part 2: Method for materials sensitive to time, temperature history and/or moisture
ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 1: General method
ISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 4: Preparation of assemblies
ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 4433-1, Thermoplastics pipes — Resistance to liquid chemicals — Classification — Part 1: Immersion
test method
ISO 11922-1, Thermoplastics pipes for the conveyance of fluids — Dimensions and tolerances — Part 1:
Metric series
ISO 16486-3:2020(E)
ISO 12176-4, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 4:
Traceability coding
3)
ISO 12176-5:— , Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems —
Part 5: Two-dimensional data coding of components and data exchange format for PE piping systems
ISO 13950, Plastics pipes and fittings — Automatic recognition systems for electrofusion joints
ISO 13951, Plastics piping systems — Test method for the resistance of plastic pipe/pipe or pipe/fitting
assemblies to tensile loading
ISO 13953, Polyethylene (PE) pipes and fittings — Determination of the tensile strength and failure mode of
test pieces from a butt-fused joint
ISO 13954, Plastics pipes and fittings — Peel decohesion test for polyethylene (PE) electrofusion assemblies
of nominal outside diameter greater than or equal to 90 mm
ISO 13955, Plastics pipes and fittings — Crushing decohesion test for polyethylene (PE) electrofusion
assemblies
ISO 13956, Plastics pipes and fittings — Decohesion test of polyethylene (PE) saddle fusion joints —
Evaluation of ductility of fusion joint interface by tear test
ISO 13957, Plastics pipes and fittings — Polyethylene (PE) tapping tees — Test method for impact resistance
ISO 16486-1, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U)
piping systems with fusion jointing and mechanical jointing — Part 1: General
ISO 16486-2, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U)
piping systems with fusion jointing and mechanical jointing — Part 2: Pipes
ISO 16486-5, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U)
piping systems with fusion jointing and mechanical jointing — Part 5: Fitness for purpose of the system
ISO 17778, Plastics piping systems — Fittings, valves and ancillaries — Determination of gaseous flow
rate/pressure drop relationships
ISO 17885, Plastics piping systems — Mechanical fittings for pressure piping systems — Specifications
EN 682, Elastomeric seals — Materials requirements for seals used in pipes and fittings carrying gas and
hydrocarbon fluids
IEC 60529, Degrees of protection provided by enclosures (IP Code)
API 5L, Specification for Line Pipe
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 16486-1 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
electrofusion socket fitting
polyamide (PA-U) fitting which contains one or more integral heating elements that are capable of
transforming electrical energy into heat to realize a fusion joint with a spigot end and/or a pipe
3) Under preparation. Stage at the time of publication: ISO/FDIS 12176-5:2020.
2 © ISO 2020 – All rights reserved

ISO 16486-3:2020(E)
3.2
electrofusion saddle fitting
unplasticized polyamide (PA-U) fitting which contains one or more integral heating elements that are
capable of transforming electrical energy into heat to realize fusion onto a pipe
3.3
tapping tee
electrofusion saddle fitting (3.2) (top loading or wraparound) which contains an integral cutter, used to
cut through the wall of the main pipe, and holds the coupon inside the cutter
Note 1 to entry: The cutter remains in the body of the saddle after installation.
3.4
spigot end fitting
unplasticized polyamide (PA-U) fitting where the outside diameter of the spigot length is equal to the
nominal outside diameter, d , of the corresponding pipe
n
3.5
transition fitting
factory made fitting that makes a transition joint between an unplasticized polyamide (PA-U) piping
and a metallic pipe
Note 1 to entry: The metallic parts of the fitting may be assembled to metallic pipes by screw threads, compression
joints, welded or flanged connections. The fitting can allow for either a dismountable or permanently assembled
joint. In some cases, the supporting ring can also act as a grip ring.
3.6
voltage regulation
control of energy supplied, during the fusion process of an electrofusion fitting, by means of the voltage
parameter
3.7
out-of-roundness
difference between the measured maximum outside diameter and the measured
minimum outside diameter in the same cross-sectional plane of a pipe or spigot end of a fitting
3.8
out-of-roundness
difference between the measured maximum inside diameter and the measured minimum
inside diameter in the same cross-sectional plane of a socket
4 Material
4.1 PA-U compound
The fittings shall be made from virgin material.
The compound from which the fittings are made shall be in accordance with ISO 16486-1.
4.2 Material for non-unplasticized polyamide parts
4.2.1 General
The materials and constituent elements used in making the fitting shall be resistant to the external and
internal environments in which they are intended to be used
1) during storage,
2) under the effect of the fluids being conveyed, and
ISO 16486-3:2020(E)
3) taking account of the service environment and operating conditions.
Fittings materials, including elastomers, greases and lubricants in contact with the PA-U pipe, shall not
adversely affect pipe performance or initiate stress cracking.
4.2.2 Metal parts
All parts susceptible to corrosion shall be adequately protected.
When dissimilar metallic materials are used which can be in contact with moisture, steps shall be taken
to avoid galvanic corrosion.
Metals and materials produced by corrosion shall not affect the long-term performance of the pipe/
fitting.
4.2.3 Elastomers
Elastomeric materials used for the manufacture of seals shall be in accordance with EN 682.
4.2.4 Other materials
Greases or lubricants shall not exude on to the fusion areas, and shall not affect the long-term
performance of the pipe/fitting.
5 General characteristics
5.1 Appearance
When viewed without magnification, the internal and external surfaces of the fitting shall be smooth,
clean and free from scoring, cavities and other surface defects such as would prevent conformity of the
fitting to this document.
No component of the fitting shall show any signs of damage, scratches, pitting, bubbles, blisters,
i
...