SIST EN ISO 16486-3:2020

SLOVENSKI STANDARD
oSIST prEN ISO 16486-3:2020
01-januar-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/DIS 16486-3:2019)
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/DIS
16486-3:2019)
Kunststoff-Rohrleitungssysteme für die Gasversorgung - Rohrleitungssysteme aus
weichmacherfreiem Polyamid (PA-U) mit Schweißverbindungen und mechanischen
Verbindungen - Teil 3: Formstücke (ISO/DIS 16486-3:2019)
Systèmes de canalisations en matières plastiques pour la distribution de combustibles
gazeux - Systèmes de canalisations en polyamide non plastifié (PA-U) avec asemblages
par soudage et assemblages mécaniques - Partie 3: Raccords (ISO/DIS 16486-3:2019)
Ta slovenski standard je istoveten z: prEN ISO 16486-3
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
oSIST prEN ISO 16486-3:2020 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 16486-3:2020

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oSIST prEN ISO 16486-3:2020
DRAFT INTERNATIONAL STANDARD
ISO/DIS 16486-3
ISO/TC 138/SC 4 Secretariat: NEN
Voting begins on: Voting terminates on:
2019-10-25 2020-01-17
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
ICS: 83.140.30; 75.200
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 16486-3:2019(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2019

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oSIST prEN ISO 16486-3:2020
ISO/DIS 16486-3:2019(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
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
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ISO copyright office
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Published in Switzerland
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oSIST prEN ISO 16486-3:2020
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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 . 4
5.6 Fusion compatibility . 5
5.7 Appearance of transition fittings. 5
6 Geometrical characteristics . 5
6.1 Measurement of dimensions . 5
6.2 Dimensions of electrofusion sockets . 5
6.2.1 Diameters and lengths of electrofusion sockets . 5
6.2.2 Wall thickness . 6
6.3 Dimensions of spigot end fittings . 7
6.4 Dimensions of tapping tees . 9
6.5 Dimensions of transition fittings to other materials .10
7 Mechanical characteristics .10
7.1 General .10
7.2 Conditioning .10
7.3 Mechanical requirements .11
7.4 Additional requirements for transition fittings .12
8 Physical characteristics .12
8.1 Conditioning .12
8.2 Requirement .12
9 Chemical resistance of fittings in contact with chemicals .13
10 Performance requirements .13
11 Marking .13
11.1 General .13
11.2 Minimum required marking of fittings .13
11.3 Additional information required on fitting or label .14
11.4 Fusion system recognition .14
12 Delivery conditions .14
12.1 General .14
Annex A (informative) Examples of typical terminal connections for electrofusion .15
Annex B (normative) Short-term pressure test method .17
Annex C (normative) Tensile test fitting/pipe assemblies .19
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Bibliography .20
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oSIST prEN ISO 16486-3:2020
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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.
This second edition cancels and replaces the first edition (ISO 16486-3:2012), which has been
technically revised.
The main changes compared to the previous edition are as follows:
— Amendment 1 of ISO 16486-3:2012 is incorporated;
— At Table 1 electro fusion socket length has been revised and extended;
— Tables 1 and 3 are extended with nominal outside diameters up to and including 630 mm;
— 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;
— About the limited use of MVR a note to Table 6 and a footnote in Table 7 have been added;
— For transition fittings the reference to ISO 17885 is introduced;
— For Fusion system recognition reference is made to ISO 13950 and notes reference to ISO 12176-4
and ISO/DIS 12176-5;
— The title of Clause 12 changed from Packaging to Delivery conditions,
ISO 16486 consists of the following parts, under the general title Plastics piping systems for the supply
of gaseous fuels — Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical
jointing:
Part 1: General
Part 2: Pipes
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Part 3: Fittings
Part 4: Valves
Part 5: Fitness for purpose of the system
Part 6: Code of practice for design, handling and installation
Part 7: Assessment of conformity of the system (proposal in preparation)
A list of all parts in the ISO 16486- series can also be found on the ISO website.
Parts 1, 2, 3 (this document), 5 and 6 have been prepared by ISO/TC138/SC4, and a future part 7:
Assessment of conformity is under preparation. Part 4 has been prepared by Technical Committee
ISO/TC138/SC 7 Valves and auxiliary equipment of plastics materials.
Part 6 will not be implemented as European Standard under the Vienna Agreement.
NOTE Future CEN/TS 12007-x, Gas infrastructure — Pipelines for maximum operating pressure up to and
including 16 bar — Part x: Design, handling, installation and operation of unplasticized polyamide (PA-U) piping
systems with fusion joining and mechanical jointing - Functional recommendation, to be prepared by Technical
Committee CEN/TC234 Gas infrastructure will deal with the recommended practice for installation of plastics
pipes system in accordance with EN ISO 16486 (all parts except for part 6).
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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Introduction
This part of ISO 16486 specifies the requirements for a piping system and its components made from
unplasticized polyamide (PA-U), and 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
European Standard under the Vienna Agreement. Recommended practice for installation will be given
in future CEN/TS 12007-x, Gas infrastructure — Pipelines for maximum operating pressure up to and
including 16 bar — Part x: Design, handling, installation and operation of unplasticized polyamide (PA-U)
piping systems with fusion joining and mechanical jointing - Functional recommendation, that is under
preparation by Technical Committee CEN/TC234 Gas infrastructure.
This part of ISO 16486 covers the characteristics of fittings.
Assessment of conformity of the system is to form the subject of a future part 7.
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oSIST prEN ISO 16486-3:2020
DRAFT INTERNATIONAL STANDARD ISO/DIS 16486-3:2019(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 part of ISO 16486 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.
ISO 16486 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 ISO 16486, it is applicable to PA-U fittings, their joints, to joints
with components of PA-U and to joints with mechanical fittings of other materials, and to the following
fitting types:
— fusion fittings — electrofusion fittings and butt fusion fittings;
— 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 1110, Plastics — Polyamides — Accelerated conditioning of test specimens
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
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ISO/DIS 12176-4, Plastics pipes and fittings – Equipment for fusion jointing polyethylene systems Part 4:
Traceability coding
ISO/DIS 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 15512, Plastics — Determination of water content
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 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 60529:2013, Degrees of protection provided by enclosures (IP Code)
API 5L, Specification to Line Pipe
3 Terms and definitions
For the purposes of this document, the terms, definitions, symbols and abbreviated terms given in
ISO 16486-1 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 realise a fusion joint with a spigot end and/or a pipe
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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 (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
branch saddle
electrofusion saddle fitting (top loading or wraparound), which requires an ancillary cutting tool for
drilling the hole in the main pipe
3.5
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
3.6
transition fittings
factory made fitting that makes a transition joint between a 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 may also act as a grip ring.
3.7
voltage regulation
control of energy supplied, during the fusion process of an electrofusion fitting, by means of the voltage
parameter
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
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.
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4.2.2 Metal parts
All parts susceptible to corrosion shall be adequately protected.
When dissimilar metallic materials are used which may 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 part of ISO 16486.
5.2 Design
The design of the fitting shall be such that, when assembling the fitting onto the pipe, spigot ends or
other components, the electrical coils and/or seals and other functional parts (e.g. grippers) are not
displaced.
5.3 Colour
The colour of fittings shall be yellow or black.
5.4 Electrical characteristics for electrofusion fittings
The electrical protection to be provided by the system depends on the voltage and the current used and
on the characteristics of the electric power.
For voltages greater than 25 V, direct human contact with the energized parts shall not be possible
when the fitting is in the fusion cycle during assembly in accordance with the instructions of the
manufacturer of the fittings and the assembly equipment, as applicable.
[1] [2]
This type of fitting is part of an electrical system as defined in IEC 60335-1 , IEC 60364-1 and
[3]
IEC 60449 . Protection against direct contact with active parts (live conductors) shall be required in
accordance with IEC 60529. This protection is a function of the work site conditions.
NOTE See Annex A for examples of typical electrofusion terminal connectors.
The surface finish of the terminal pins shall allow a minimum contact resistance in order to satisfy the
resistance tolerance requirements (nominal value ± 10 %).
5.5 Appearance of factory-made fusion joints
The following requirements apply only to joints and fittings made or assembled in the factory.
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