ISO 16486-3:2012
(Main)Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing — Part 3: Fittings
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 16486-3:2012 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, ISO 16486-3:2012 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.
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
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 16486-3
First edition
2012-06-01
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 16486-3:2012(E)
©
ISO 2012
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ISO 16486-3:2012(E)
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ii © ISO 2012 – All rights reserved
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ISO 16486-3:2012(E)
Contents Page
Foreword .iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms . 2
4 Material . 3
4.1 PA-U compound . 3
4.2 Material for non-unplasticized polyamide parts . 3
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 joints . 4
5.6 Fusion compatibility . 4
6 Geometrical characteristics . 5
6.1 Measurement of dimensions . 5
6.2 Dimensions of electrofusion sockets . 5
6.3 Dimensions of spigot end fittings . 7
6.4 Dimensions of tapping tees . 8
6.5 Dimensions of transition fittings to other materials . 9
7 Mechanical characteristics . 9
7.1 General . 9
7.2 Conditioning . 9
7.3 Requirements . 9
8 Physical characteristics .10
8.1 Conditioning .10
8.2 Requirement . 11
9 Chemical resistance of fittings in contact with chemicals . 11
10 Performance requirements . 11
11 Marking . 11
11.1 General . 11
11.2 Minimum required marking of fittings . 11
11.3 Additional information required on fitting or label .12
11.4 Fusion system recognition .12
12 Packaging .12
Annex A (informative) Examples of typical terminal connections for electrofusion fittings .13
Annex B (normative) Short-term pressure test method .15
Annex C (normative) Tensile test fitting/pipe assemblies .17
Bibliography .18
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ISO 16486-3:2012(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 16486-3 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 first edition of ISO 16486-3 cancels and replaces the first edition of ISO 22621-3:2007 which has been
technically revised.
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
— Part 3: Fittings
— Part 5: Fitness for purpose of the system
— Part 6: Code of practice for design, handling and installation
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ISO 16486-3:2012(E)
Introduction
Thin wall thickness unplasticized polyamide (PA-U) pipes and solvent cement joints are used typically for low
pressures, while thicker wall thickness pipes and butt fusion, electrofusion or mechanical joints are typically
used for high pressures.
For technical and safety reasons, it is not possible to mix the components of the two types of piping system
(thin wall thickness pipes cannot be jointed by butt fusion or mechanical joints and vice versa). In particular,
solvent cement joints must not be used for jointing for high pressure piping systems.
So for the time being, the standardization programme dealing with unplasticized polyamide (PA-U) piping
systems for the supply of gaseous fuels is split into two series of International Standards, with one series
(ISO 17467) covering piping systems the components of which are connected by solvent cement jointing and
the other (ISO 16486) the components of which are connected by fusion jointing and/or mechanical jointing.
When more experience will be gained from the field, it might be reasonable to merge the ISO 17467 series and
the ISO 16486 series in one single series applicable to PA-U piping systems.
A similar series (ISO 17135) for fusion and mechanically jointed plasticized polyamide (PA-P) piping systems
is in preparation.
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INTERNATIONAL STANDARD ISO 16486-3:2012(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, in whole or in part, are normatively referenced in this document and are indispensable
for its application. 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 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 11922-1:1997, Thermoplastic pipes for the conveyance of fluids — Dimensions and tolerances — Part 1:
Metric series
ISO 13951:2001, Plastics piping systems — Test method for the resistance of polyolefin pipe/pipe or pipe/fitting
assemblies to tensile loading
ISO 13953:2001, Polyethylene (PE) pipes and fittings — Determination of the tensile strength and failure mode
of test pieces from a butt-fused joint
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ISO 16486-3:2012(E)
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 13955:1997, Plastics pipes and fittings — Crushing decohesion test for polyethylene (PE) electrofusion
assemblies
ISO 13956:2010, Plastics pipes and fittings — Decohesion test of polyethylene (PE) saddle fusion joints —
Evaluation of ductility of fusion joint interface by tear test
ISO 13957:1997, Plastics pipes and fittings — Polyethylene (PE) tapping tees — Test method for impact resistance
ISO 16486-1:2012, 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
EN 682, Elastomeric seals — Materials requirements for seals used in pipes and fittings carrying gas and
hydrocarbon fluids
IEC 60529:2001, Degrees of protection provided by enclosures (IP Code)
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the terms, definitions, symbols and abbreviated terms given in
ISO 16486-1 and the following apply.
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
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 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
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ISO 16486-3:2012(E)
3.6
mechanical fitting
fitting for assembling an unplasticized polyamide (PA-U) pipe to another PA-U pipe or any other element of the
piping system
NOTE 1 The mechanical fitting can be supplied for field assembly or pre-assembled by the manufacturer and generally
includes a compression part to provide pressure integrity, leak-tightness and resistance to end loads. A support sleeve
inserted into the pipe bore provides a permanent support for the PA-U pipe to prevent creep in the pipe wall under radial
compressive forces.
NOTE 2 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
a) during storage,
b) under the effect of the fluids being conveyed, and
c) 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 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.
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ISO 16486-3:2012(E)
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 fitting shall be either black or yellow.
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.
This type of fitting is part of an electrical system as defined in IEC 60335-1, IEC 60364-1 and 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 joints
The following requirements apply only to joints and fittings made or assembled in the factory.
The internal and external surfaces of the pipe and fitting after fusion jointing, examined visually without
magnification, shall be free from melt exudation outside the confines of the fitting apart from that which may be
declared acceptable by the fitting manufacturer or used as a fusion marker.
Any melt exudation shall not cause wire movement in electrofusion fittings leading to short circuiting when
jointed in accordance with the manufacturer’s instructions. There shall be no excessive creasing of the internal
surfaces of the adjoining pipes.
The interface of the butt fusion joints shall be perpendicular to the pipe and/or spigot end axis.
5.6 Fusion compatibility
Components made from PA-U 11 shall be heat fusion jointed only to components made from PA-U 11.
Components made from PA-U 12 shall be heat fusion jointed only to components made from PA-U 12.
Components made from PA-U are not fusion compatible with components made from other polymers.
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ISO 16486-3:2012(E)
6 Geometrical characteristics
6.1 Measurement of dimensions
The dimensions of the fittings shall be measured in accordance with ISO 3126. In case of dispute, the
measurement of dimensions shall be made not less than 24 h after manufacture and after conditioning for at
least 4 h at (23 ± 2) °C.
6.2 Dimensions of electrofusion sockets
6.2.1 Diameters and lengths of electrofusion sockets
When measured in accordance with 6.1, the diameters an
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