ISO 14531-3:2010
(Main)Plastics pipes and fittings — Crosslinked polyethylene (PE-X) pipe systems for the conveyance of gaseous fuels — Metric series — Specifications — Part 3: Fittings for mechanical jointing (including PE-X/metal transitions)
Plastics pipes and fittings — Crosslinked polyethylene (PE-X) pipe systems for the conveyance of gaseous fuels — Metric series — Specifications — Part 3: Fittings for mechanical jointing (including PE-X/metal transitions)
ISO 14531-3:2010 specifies the physical properties and mechanical-performance requirements for full-end-load-resistant mechanical fittings for use in the connection of crosslinked polyethylene (PE‑X) pipes conforming to ISO 14531‑1 and in the construction of transition assemblies for joining PE‑X pipes to metal pipes having plain spigot, screw thread, compression socket and flange terminations. In addition, it lays down dimensional requirements and specifies some general material properties (including chemical resistance) together with a classification scheme for PE‑X fitting materials produced in the form of pipe. ISO 14531-3:2010, when used in conjunction with the other parts of ISO 14531, provides the basis for the design, manufacture and installation of PE‑X piping systems (PE‑X pipes, PE‑X fusion fittings and mechanical fittings) for the supply of category D and category E hydrocarbon-based fuels.
Tubes et raccords en matières plastiques — Systèmes de tubes en polyéthylène réticulé (PE-X) pour le transport de combustibles gazeux — Série métrique — Spécifications — Partie 3: Raccords pour assemblage mécanique (y compris transitions PE-X/métal)
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 14531-3
Second edition
2010-12-01
Plastics pipes and fittings — Crosslinked
polyethylene (PE-X) pipe systems for the
conveyance of gaseous fuels — Metric
series — Specifications —
Part 3:
Fittings for mechanical jointing
(including PE-X/metal transitions)
Tubes et raccords en matières plastiques — Systèmes de tubes
en polyéthylène réticulé (PE-X) pour le transport de combustibles
gazeux — Série métrique — Spécifications —
Partie 3: Raccords pour assemblage mécanique (y compris transitions
PE-X/métal)
Reference number
©
ISO 2010
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ii © ISO 2010 – All rights reserved
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.2
3 Terms and definitions .3
4 Materials .3
4.1 General .3
4.2 Strength.4
4.3 Chemical resistance.4
4.4 Lubricants .5
4.5 Reprocessable (re-work) material.5
5 Fittings.5
5.1 Design.5
5.2 Appearance .6
5.3 Dimensions .7
5.4 Mechanical performance .7
5.5 Validation of fitting design and design pressure DP .7
F
5.6 Performance requirements for fittings in conformity with ISO 10838 .9
6 Elastomeric seals .9
7 Marking.9
7.1 Legibility.9
7.2 Damage.9
7.3 Minimum marking requirements.10
7.4 Labels .10
Annex A (normative) Resistance to gas constituents .11
Annex B (normative) Method of test of the integrity of a fitting after an external blow .12
Annex C (normative) Constant-strain thermal-cycling test.14
Annex D (informative) Validation of fitting design pressure DP at 20 °C (plastic bodied fittings) .16
F
Annex E (normative) Validation of fitting design pressure DP at 20 °C (metal bodied fittings) .18
F
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 14531-3 was prepared by Technical Committee ISO/TC 138, Plastic pipes, fittings and valves for the
transport of fluids, Subcommittee SC 4, Plastic pipes and fittings for the supply of gaseous fuels.
This second edition cancels and replaces the first edition (ISO 14531-3:2006), of which it constitutes a minor
revision.
ISO 14531 consists of the following parts, under the general title Plastics pipes and fittings — Crosslinked
polyethylene (PE-X) pipe systems for the conveyance of gaseous fuels — Metric series — Specifications:
⎯ Part 1: Pipes
⎯ Part 2: Fittings for heat-fusion jointing
⎯ Part 3: Fittings for mechanical jointing (including PE-X/metal transitions)
⎯ Part 4: System design and installation guidelines
iv © ISO 2010 – All rights reserved
Introduction
Further to the publication of International Standards for crosslinked polyethylene (PE-X) hot-water pipes, it has
become evident that the properties of PE-X, in particular its high fracture resistance and a recently established
socket and saddle fusion-jointing capability, render it suitable for use in high-performance gas-distribution
systems. The philosophy of ISO 14531 is to provide the basis for the introduction of PE-X gas pipe systems by
the specification of a performance envelope beyond that covered by existing PE standards in order to take its
application into regimes of higher operating pressures and extremes of operating temperature.
This part of ISO 14531 is therefore one part of a four-part system standard covering pipes, fittings for heat-
fusion jointing, fittings for mechanical jointing and design and installation guidelines. The content is suitable for
use by procurement authorities and distribution engineers responsible for the design, installation and
operation of pipeline systems.
This part of ISO 14531 is structured to ensure the supply of mechanical fittings with an end-load resistance
greater than that exhibited by the pipe(s) to which the fittings are connected.
INTERNATIONAL STANDARD ISO 14531-3:2010(E)
Plastics pipes and fittings — Crosslinked polyethylene (PE-X)
pipe systems for the conveyance of gaseous fuels — Metric
series — Specifications —
Part 3:
Fittings for mechanical jointing (including PE-X/metal
transitions)
1 Scope
This part of ISO 14531 specifies the physical properties and mechanical-performance requirements for full-
end-load-resistant mechanical fittings for use in the connection of crosslinked polyethylene (PE-X) pipes
conforming to ISO 14531-1 and in the construction of transition assemblies for joining PE-X pipes to metal
pipes having plain spigot, screw thread, compression socket and flange terminations. In addition, it lays down
dimensional requirements and specifies some general material properties (including chemical resistance)
together with a classification scheme for PE-X fitting materials produced in the form of pipe.
This part of ISO 14531, when used in conjunction with the other parts of ISO 14531, provides the basis for the
design, manufacture and installation of PE-X piping systems (PE-X pipes, PE-X fusion fittings and mechanical
fittings) for the supply of category D and category E hydrocarbon-based fuels (see ISO 13623) at
1)
a) maximum operating pressures (MOPs) up to and including 16 bar and
b) a maximum operating temperature of +60 °C and
c) a minimum operating temperature of
1) −50 °C;
2) −35 °C;
3) −20 °C.
Conformity to this part of ISO 14531-3 of mechanical fittings produced in accordance with ISO 10838-1,
ISO 10838-2 or ISO 10838-3 may be claimed subject to the satisfactory conclusion of the tests listed in 5.6
and an end-use restriction on operating temperatures to the temperature range −20 °C to +40 °C.
NOTE It is recognized that mechanical fittings conforming to ISO 10838-1, ISO 10838-2 or ISO 10838-3 are limited to
a maximum operating temperature of 40 °C. Provision is made in ISO 14531-4 for the use on a restricted-temperature
basis of ISO 10838 fittings conforming to 5.6 in conjunction with PE-X pipes conforming to ISO 14531-1. The fitting
manufacturer's technical file should also be consulted for relevant supporting information.
For installation purposes, this part of ISO 14531 provides for the jointing of mechanical fittings to PE-X pipes
within the temperature range −5 °C to +40 °C.
5 2
1) 1 bar = 10 N/m = 100 kPa.
2 Normative references
The following referenced documents are indispensable for the application 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 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
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 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 2: Preparation of pipe test pieces
ISO 1167-3, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 3: Preparation of components
ISO 16010, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gaseous
fuels and hydrocarbon fluids
ISO 3127, Thermoplastics pipes — Determination of resistance to external blows — Round-the-clock method
ISO 3458, Assembled joints between fittings and polyethylene (PE) pressure pipes — Test of leakproofness
under internal pressure
ISO 4437, Buried polyethylene (PE) pipes for the supply of gaseous fuels — Metric series — Specifications
ISO 8085-3:2001, Polyethylene fittings for use with polyethylene pipes for the supply of gaseous fuels —
Metric series — Specifications — Part 3: Electrofusion fittings
ISO 9080, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of
thermoplastics materials in pipe form by extrapolation
ISO 10838-1:2000, Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels —
Part 1: Metal fittings for pipes of nominal outside diameter less than or equal to 63 mm
ISO 10838-2:2000, Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels —
Part 2: Metal fittings for pipes of nominal outside diameter greater than 63 mm
ISO 10838-3:2001, Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels —
Part 3: Thermoplastics fittings for pipes of nomina
...
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