SIST EN ISO 16486-1:2024

SLOVENSKI STANDARD
01-marec-2024
Nadomešča:
SIST EN ISO 16486-1:2020
Cevni sistemi iz polimernih materialov za oskrbo s plinastimi gorivi - Cevni sistemi
iz nemehčanega poliamida (PA-U) z zvari in mehanskimi spoji - 1. del: Splošno
(ISO 16486-1:2023)
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-
1:2023)
Kunststoff-Rohrleitungssysteme für die Gasversorgung - Rohrleitungssysteme aus
weichmacherfreiem Polyamid (PA-U) mit Schweißverbindungen und mechanischen
Verbindungen - Teil 1: Allgemeines (ISO 16486-1:2023)
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 1: Généralités (ISO
16486-1:2023)
Ta slovenski standard je istoveten z: EN ISO 16486-1:2023
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 16486-1
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2023
EUROPÄISCHE NORM
ICS 75.200; 83.140.30 Supersedes EN ISO 16486-1:2020
English Version
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 16486-1:2023)
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 1: Allgemeines (ISO
Partie 1: Généralités (ISO 16486-1:2023) 16486-1:2023)
This European Standard was approved by CEN on 19 May 2023.

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, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16486-1:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 16486-1:2023) 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 June 2024, and conflicting national standards shall be
withdrawn at the latest by June 2024.
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.
This document supersedes EN ISO 16486-1:2020.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 16486-1:2023 has been approved by CEN as EN ISO 16486-1:2023 without any
modification.
INTERNATIONAL ISO
STANDARD 16486-1
Third edition
2023-12
Plastics piping systems for the supply
of gaseous fuels — Unplasticized
polyamide (PA-U) piping systems
with fusion jointing and mechanical
jointing —
Part 1:
General
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 1: Généralités
Reference number
ISO 16486-1:2023(E)
ISO 16486-1:2023(E)
© ISO 2023
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
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CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 16486-1:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 Terms related to geometrical characteristics . 3
3.2 Terms related to materials . 3
3.3 Terms related to material characteristics . 4
3.4 Terms related to service conditions . 4
4 Symbols and abbreviated terms.5
4.1 Symbols . 5
4.2 Abbreviated terms . 5
5 Material. 6
5.1 Material of the components . 6
5.2 Compound . 6
5.2.1 Additives . 6
5.2.2 Colour . 6
5.2.3 Identification compound . 6
5.2.4 Virgin material . 6
5.2.5 Characteristics . 6
5.2.6 Change of compound formulation . 9
5.3 Fusion compatibility . 9
5.4 Classification and designation . . 9
5.5 Maximum operating pressure (MOP) . 10
5.6 Effects of transport of liquid hydrocarbons and hydrogen . 10
Annex A (normative) Chemical resistance .11
Annex B (normative) Hoop stress at burst .14
Annex C (informative) Continuous liquid hydrocarbon exposure from transported fluid or
soil contamination .16
Annex D (informative) Permeation of different gases .17
Bibliography .22
iii
ISO 16486-1:2023(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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
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 third edition cancels and replaces the second edition (ISO 16486-1:2020), which has been
technically revised.
The main changes are as follows:
— in Table 1, the old requirement for "pigment or carbon black dispersion" has been substituted by
a
new requirements with reference to ISO 18553 and no reference to Annex A. Footnote has also
been corrected;
— the former Annex A, “Assessment of degree of pigment or carbon black dispersion in unplasticized
polyamide compounds,” has been deleted and reference is made to ISO 18553 instead;
— in Table D.2 and Figure D.2, permeation coefficients of methane for PA-U 11 are given;
— in Table D.4 and Figure D.4, permeation coefficients of hydrogen for PA-U 11 are given.
A list of all parts in the ISO 16486 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.
iv
ISO 16486-1:2023(E)
Introduction
This document specifies the general 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 materials and components of the piping system are specified in this
document and in ISO 16486-2, ISO 16486-3 and ISO 16486-4.
Characteristics for fitness for purpose of the system and generic fusion parameters as well as related
requirements and test methods 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.
Assessment of conformity of the system forms the subject of ISO/TS 16486-7.
ISO/TS 16486-8 specifies the training and assessment of fusion operators.
[7]
NOTE 1 Recommended practice for installation is also given in CEN/TS 12007-6, which has been prepared
by Technical Committee CEN/TC 234, Gas infrastructure.
[8]
NOTE 2 EN 13067 also gives recommendations for the qualification of welders for thermoplastics welded
assemblies.
NOTE 3 A list of ASTM standards related to polyamide pipes and fittings for the supply of gas is given in the
[9], [10], [11], [12]
Bibliography.
v
INTERNATIONAL STANDARD ISO 16486-1:2023(E)
Plastics piping systems for the supply of gaseous fuels —
Unplasticized polyamide (PA-U) piping systems with fusion
jointing and mechanical jointing —
Part 1:
General
1 Scope
This document specifies the general properties of unplasticized polyamide (PA-U) compounds for the
manufacture of pipes, fittings and valves made from these compounds, 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.
This document establishes a calculation and design scheme on which to base the maximum operating
pressure (MOP) of a PA-U piping system.
NOTE For the purpose of this document the term gaseous fuels includes, for example, natural gas, methane,
butane, propane, hydrogen, manufactured gas, biogas, and mixtures of these gases.
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 179-1, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented impact test
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 307, Plastics — Polyamides — Determination of viscosity number
ISO 472, Plastics — Vocabulary
ISO 527-1, Plastics — Determination of tensile properties — Part 1: General principles
ISO 527-2, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and
extrusion plastics
ISO 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special
characteristics
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 1183-1, Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion
method, liquid pycnometer method and titration method
ISO 16486-1:2023(E)
ISO 1183-2, Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density
gradient column method
ISO 2505, Thermoplastics pipes — Longitudinal reversion — Test method and parameters
ISO 6259-1, Thermoplastics pipes — Determination of tensile properties — Part 1: General test method
ISO 6259-3, Thermoplastics pipes — Determination of tensile properties — Part 3: Polyolefin pipes
ISO 6964, Polyolefin pipes and fittings — Determination of carbon black content by calcination and
pyrolysis — Test method
ISO 9080, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of
thermoplastics materials in pipe form by extrapolation
ISO 11413:2019, Plastics pipes and fittings — Preparation of test piece assemblies between a polyethylene
(PE) pipe and an electrofusion fitting
ISO 12162, Thermoplastics materials for pipes and fittings for pressure applications — Classification,
designation and design coefficient
ISO 13477, Thermoplastics pipes for the conveyance of fluids — Determination of resistance to rapid crack
propagation (RCP) — Small-scale steady-state test (S4 test)
ISO 13478, Thermoplastics pipes for the conveyance of fluids — Determination of resistance to rapid crack
propagation (RCP) — Full-scale test (FST)
ISO 13479, Polyolefin pipes for the conveyance of fluids — Determination of resistance to crack propagation
— Test method for slow crack growth on notched pipes
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 15512, Plastics — Determination of water content
ISO 16396-1, Plastics — Polyamide (PA) moulding and extrusion materials — Part 1: Designation system
and basis for specifications
ISO 16396-2, Plastics — Polyamide (PA) moulding and extrusion materials — Part 2: Preparation of test
specimens and determination of properties
ISO 16871, Plastics piping and ducting systems — Plastics pipes and fittings — Method for exposure to
direct (natural) weathering
ISO 18553, Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin
pipes, fittings and compounds
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472, ISO 1043-1 and
ISO 16396-1 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
ISO 16486-1:2023(E)
3.1 Terms related to geometrical characteristics
3.1.1
nominal outside diameter
d
n
specified outside diameter of a component, which is identical to the minimum mean outside diameter,
d
em,min
Note 1 to entry: Expressed in millimetres.
3.1.2
mean outside diameter
d
em
measured length of the outer circumference of a pipe, or the spigot end of a fitting, divided by π (≈3,142),
rounded up to the nearest 0,1 mm
3.1.3
wall thickness at any point
e
measured wall thickness at any point around the circumference of a component, rounded up to the
nearest 0,1 mm
3.1.4
minimum wall thickness at any point
e
min
minimum value for the wall thickness at any point (3.1.3) around the circumference of a component, as
specified
3.1.5
standard dimension ratio
SDR
ratio of the nominal outside diameter (3.1.1), d , of a pipe to its nominal wall thickness, e
n n
3.2 Terms related to materials
3.2.1
compound
homogenous mixture of base polymer (PA-U) and additives, i.e. antioxidants, pigments, UV stabilisers,
at a dosage level necessary for the processing and use of components conforming to the requirements
of this document
3.2.2
virgin material
compound in the form of granules that has not been subjected to use or processing other than that
required for its manufacture and to which no reprocessed or recycled materials have been added
3.2.3
own reprocessable material
material prepared from clean, rejected and unused pipes, fittings, or valves, including trimmings from
the production of pipes, fittings, or valves, that is reprocessed in a manufacturer's plant after having
been previously processed by the same manufacturer in the production of components by, for example,
injection-moulding or extrusion
ISO 16486-1:2023(E)
3.3 Terms related to material characteristics
3.3.1
lower confidence limit of the predicted hydrostatic strength
σ
LPL
quantity, with the dimensions of stress, which represents the 97,5 % lower confidence limit of the
predicted hydrostatic strength at a temperature θ and time t
Note 1 to entry: The quantity is expressed in megapascals (MPa).
Note 2 to entry: Temperature, θ, is expressed in degrees Celsius and time, t, is expressed in years.
3.3.2
minimum required strength
MRS
value of σ (3.3.1) at 20 °C and 50 years, rounded down to the next smaller value of the R10 series or
LPL
the R20 series
Note 1 to entry: The R10 series conforms to ISO 3 and the R20 series conforms to ISO 497.
3.3.3
categorized required strength at temperature θ and time t
CRS
θ,t
value of σ (3.3.1) at temperature θ and time t, rounded down to the next smaller value of the
LPL
R10 series or the R20 series
Note 1 to entry: CRS at 20 °C and 50 years equals MRS (3.3.2). Policies and procedures for developing CRS are
,θ,t
[15]
given in PPI TR-3.
Note 2 to entry: Temperature, θ, is expressed in degrees Celsius and time, t, is expressed in years.
Note 3 to entry: The R10 series conforms to ISO 3 and the R20 series conforms to ISO 497.
3.3.4
design coefficient
C
coefficient with a value greater than 1, which takes into consideration service conditions as well as
properties of the components of a piping system other than those represented in the lower confidence
limit
Note 1 to entry: Recommended design factors and design coefficients for thermoplastic pressure pipes are given
[16]
in PPI TR-9.
3.3.5
design stress
σ
s
σ
s,θ,t
stress derived by dividing the MRS (3.3.2) or CRS (3.3.3) by the design coefficient (3.3.4), C, i.e.
θ,t
σ = MRS/C, or σ = CRS /C
s s,θ,t θ,t
3.4 Terms related to service conditions
3.4.1
gaseous fuel
any fuel which is in a gaseous state at a temperature of 15 °C, at a pressure of one bar (0,1 MPa)
ISO 16486-1:2023(E)
3.4.2
maximum operating pressure
MOP
maximum effective pressure of the gas in the piping system, expressed in bar, which is allowed in
continuous use
Note 1 to entry: The MOP takes into account the physical and the mechanical characteristics of the components
of a piping system and the influence of the gas on these characteristics.
4 Symbols and abbreviated terms
4.1 Symbols
a charpy notched impact strength
cN
C design coefficient
d mean outside diameter
em
d nominal outside diameter
n
e wall thickness at any point
e minimum wall thickness at any point
min
L length
ln natural logarithm
p pressure at burst
p critical pressure
c
t time
θ temperature
σ hoop stress to be induced by the pressure at burst
σ lower confidence limit of the predicted hydrostatic strength
LPL
σ design stress
s
4.2 Abbreviated terms
CRS categorized required strength at temperature, θ, and time, t
θ,t
MOP maximum operating pressure
MRS minimum required strength
PA-U unplasticized polyamide
R series of preferred numbers, conforming to the Renard series
RT room temperature
SDR standard dimension ratio
ISO 16486-1:2023(E)
5 Material
5.1 Material of the components
The material from which the components, i.e. the pipes, fittings and valves, are made shall be
unplasticized polyamide (PA-U) in accordance with IS
...