Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing — Part 2: Pipes

This document specifies the physical and mechanical properties of pipes 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 of standards is applicable to PA-U piping systems, the components of which are connected by fusion jointing and/or mechanical jointing. In addition, this document lays down dimensional characteristics and requirements for the marking of pipes. Pipes conforming to this document are jointed typically by using mechanical, electrofusion or butt fusion techniques.

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 2: Tubes

Le présent document spécifie les propriétés physiques et mécaniques des tubes en polyamide non plastifié (PA-U) conformément à l'ISO 16486-1, destinés à être enterrés et utilisés pour la distribution de combustibles gazeux. Il spécifie également les paramètres d'essai pour les méthodes d'essai auxquelles il fait référence. La série de normes ISO 16486 s'applique aux systèmes de canalisations en PA-U dont les composants sont raccordés par des assemblages par soudage et/ou par des assemblages mécaniques. De plus, ce document définit les caractéristiques dimensionnelles et les exigences pour le marquage des tubes. Les tubes conformes au présent document sont généralement assemblés par des techniques mécaniques, par électrosoudage ou par soudage bout à bout.

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Status
Published
Publication Date
28-Sep-2020
Current Stage
6060 - International Standard published
Start Date
29-Sep-2020
Completion Date
29-Sep-2020
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INTERNATIONAL ISO
STANDARD 16486-2
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 2:
Pipes
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 2: Tubes
Reference number
ISO 16486-2:2020(E)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 16486-2:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© 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

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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 16486-2:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

3.2 Abbreviated terms ............................................................................................................................................................................... 2

4 Compound ................................................................................................................................................................................................................... 2

5 General characteristics .................................................................................................................................................................................. 2

5.1 Appearance ................................................................................................................................................................................................ 2

5.2 Colour .............................................................................................................................................................................................................. 3

5.3 Fusion compatibility .......................................................................................................................................................................... 3

6 Geometrical characteristics ...................................................................................................................................................................... 3

6.1 Measurement of dimensions ....................................................................................................................................................... 3

6.2 Mean outside diameters, out-of-roundness and their tolerances ............................................................... 3

6.3 Wall thicknesses and tolerances .............................................................................................................................................. 4

6.3.1 Minimum wall thickness ........................................................................................................................................... 4

6.3.2 Tolerances on wall thickness at any point ................................................................................................. 5

7 Mechanical characteristics ........................................................................................................................................................................ 6

7.1 Conditioning .............................................................................................................................................................................................. 6

7.2 Requirements ........................................................................................................................................................................................... 6

8 Physical characteristics ................................................................................................................................................................................. 8

8.1 Conditioning .............................................................................................................................................................................................. 8

8.2 Requirements ........................................................................................................................................................................................... 8

9 Marking .......................................................................................................................................................................................................................... 9

Annex A (normative) Squeeze-off technique ............................................................................................................................................10

Annex B (informative) Examples of the water uptake over time as a function of the sample

thickness ....................................................................................................................................................................................................................11

Bibliography .............................................................................................................................................................................................................................14

© ISO 2020 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 16486-2:2020(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 16486-2:2012), which has been

technically revised. It also incorporates ISO 16486-2:2012/Amd 1: 2014.
The main changes compared to the previous edition are as follows:

— Tables 1 and 2 are extended with nominal outside diameters up to and including 630 mm;

— In Table 2, former 6 hours has been changed to 16 hours in line with the phrasing in the table header;

— In Table 3, the range for the minimum wall thickness is extended up to and including 37 mm;

— Table 4 allows for e > 12 mm to use Type 3 specimen with 10 mm/min for the determination of the

elongation at break;

— Informative Annex A – Butt fusion procedure for jointing PA-U pipes – has been deleted;

— A new normative Annex A – Squeeze-off technique – has been added;

— A new informative Annex B – Examples of the water uptake over time as a function of the sample

thickness – has been added.
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 2020 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 16486-2:2020(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 pipes of the piping system are

specified in ISO 16486-1, ISO 16486-3, 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.

Assessment of conformity of the system is to form the subject of 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, 2 (this document), 3, 5 and 6 (and future Part 7) of the ISO 16486 series have been prepared by

ISO/TC 138/SC4. Part 4 has been prepared by ISO/TC 138/SC 7.
1) Under preparation. Stage at the time of publication: ISO/WD TS 16486-7:2020.
© ISO 2020 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 16486-2:2020(E)
Plastics piping systems for the supply of gaseous fuels —
Unplasticized polyamide (PA-U) piping systems with fusion
jointing and mechanical jointing —
Part 2:
Pipes
1 Scope

This document specifies the physical and mechanical properties of pipes 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 of standards is applicable to PA-U piping systems, the components of which are

connected by fusion jointing and/or mechanical jointing.

In addition, this document lays down dimensional characteristics and requirements for the marking

of pipes.

Pipes conforming to this document are jointed typically by using mechanical, electrofusion or butt

fusion techniques.
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 1167-2, 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 2505, Thermoplastics pipes — Longitudinal reversion — Test method and parameters

ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions

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 11922-1, Thermoplastics pipes for the conveyance of fluids — Dimensions and tolerances — Part 1:

Metric series

ISO 12176-4, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 4:

Traceability coding
© ISO 2020 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO 16486-2:2020(E)

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 13479, Polyolefin pipes for the conveyance of fluids — Determination of resistance to crack

propagation — Test method for slow crack growth on notched pipes

ISO 16486-1:2020, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-

U) piping systems with fusion jointing and mechanical jointing — Part 1: General

EN 12106, Plastics piping systems - Polyethylene (PE) and crosslinked polyethylene (PE-X) pipes - Test

method for the resistance to internal pressure after application of squeeze-off
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/
3.1.1
out-of-roundness

〈pipe or fitting〉 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

3.1.2
virgin material

material in a form such as granules or powder that has not been previously processed other than for

compounding and to which no rework material or recyclable material has been added

3.1.3
squeeze-off

gas flow restricted by squeezing the pipe when compressed between two clamps in such a way that the

distance between both clamps is less than twice the nominal wall thickness
3.2 Abbreviated terms
MVR melt volume-flow rate
SDR standard dimension ratio
4 Compound

The compound from which the pipes are made shall be in accordance with ISO 16486-1.

The pipes shall be made from virgin material. Rework material shall not be used.
5 General characteristics
5.1 Appearance

When viewed without magnification, the internal and external surfaces of pipes shall be smooth, clean

and free from scoring, cavities and other surface defects which can affect pipe performance. The pipe

ends shall be cut cleanly and square to the axis of the pipe.
2 © ISO 2020 – All rights reserved
---------------------- Page: 7 ----------------------
ISO 16486-2:2020(E)
5.2 Colour
The colour of the pipes shall be yellow or black.

NOTE In addition, black PA-U pipes can be identified by yellow or orange stripes, according to national

preference.
5.3 Fusion compatibility

Pipes made from PA-U 11 shall be heat fusion jointed only to pipes and/or components made from PA-U 11.

Pipes made from PA-U 12 shall be heat fusion jointed only to pipes and/or components made from

PA-U 12.

Pipes made from PA-U are not fusion compatible with pipes and/or components made from other

polymers.

NOTE Test methods for assuring fusibility are given in ISO 16486-3 and ISO 16486-5.

6 Geometrical characteristics
6.1 Measurement of dimensions

Dimensions shall be measured in accordance with ISO 3126 at (23 ± 2) °C, after being conditioned for at

least 4 h. The measurement shall not be made less than 24 h after manufacture.
6.2 Mean outside diameters, out-of-roundness and their tolerances

The mean outside diameter of the pipe, d , and the out-of-roundness and their tolerances shall be in

accordance with Table 1.
For maximum mean outside diameter grade B tolerances, ISO 11922-1 shall apply.
Table 1 — Mean outside diameters and out-of-roundness
Dimensions in millimetres
Nominal outside
Mean outside diameter Maximum of absolute out-of-roundness
diameter
b c
d d d Grade K Grade N
n em,min em,max
16 16,0 16,3 1,2 1,2
20 20,0 20,3 1,2 1,2
25 25,0 25,3 1,5 1,2
32 32,0 32,3 2,0 1,3
40 40,0 40,4 2,4 1,4
50 50,0 50,4 3,0 1,4
63 63,0 63,4 3,8 1,5
75 75,0 75,5 — 1,6
90 90,0 90,6 — 1,8
110
...

NORME ISO
INTERNATIONALE 16486-2
Deuxième édition
2020-09
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 2:
Tubes
Plastics piping systems for the supply of gaseous fuels —
Unplasticized polyamide (PA-U) piping systems with fusion jointing
and mechanical jointing —
Part 2: Pipes
Numéro de référence
ISO 16486-2:2020(F)
ISO 2020
---------------------- Page: 1 ----------------------
ISO 16486-2:2020(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2020

Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette

publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,

y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut

être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.

ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse
ii © ISO 2020 – Tous droits réservés
---------------------- Page: 2 ----------------------
ISO 16486-2:2020(F)
Sommaire Page

Avant-propos ..............................................................................................................................................................................................................................iv

Introduction ................................................................................................................................................................................................................................vi

1 Domaine d’application ................................................................................................................................................................................... 1

2 Références normatives ................................................................................................................................................................................... 1

3 Termes et définitions ....................................................................................................................................................................................... 2

3.2 Abréviations .............................................................................................................................................................................................. 2

4 Composition .............................................................................................................................................................................................................. 2

5 Caractéristiques générales ........................................................................................................................................................................ 3

5.1 Aspect ......... ..................................................................................................................................................................................................... 3

5.2 Couleur ........................................................................................................................................................................................................... 3

5.3 Compatibilité au soudage .............................................................................................................................................................. 3

6 Caractéristiques géométriques ............................................................................................................................................................. 3

6.1 Mesurage des dimensions ............................................................................................................................................................. 3

6.2 Diamètres extérieurs moyens, faux-rond et leurs tolérances ......................................................................... 3

6.3 Épaisseurs de paroi et tolérances ........................................................................................................................................... 4

6.3.1 Épaisseur de paroi minimale................................................................................................................................. 4

6.3.2 Tolérances d’épaisseur de paroi en un point quelconque ............................................................ 5

7 Caractéristiques mécaniques .................................................................................................................................................................. 6

7.1 Conditionnement .................................................................................................................................................................................. 6

7.2 Exigences ..................................................................................................................................................................................................... 6

8 Caractéristiques physiques ....................................................................................................................................................................... 9

8.1 Conditionnement .................................................................................................................................................................................. 9

8.2 Exigences ..................................................................................................................................................................................................... 9

9 Marquage ...................................................................................................................................................................................................................10

Annexe A (normative) Technique d’obturation par écrasement .........................................................................................12

Annexe B (informative) Exemples de l’absorption d’eau dans le temps en fonction de

l’épaisseur de l’échantillon .....................................................................................................................................................................13

Bibliographie ...........................................................................................................................................................................................................................16

© ISO 2020 – Tous droits réservés iii
---------------------- Page: 3 ----------------------
ISO 16486-2:2020(F)
Avant-propos

L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes

nationaux de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est

en général confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude

a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,

gouvernementales et non gouvernementales, en liaison avec l'ISO participent également aux travaux.

L'ISO collabore étroitement avec la Commission électrotechnique internationale (IEC) en ce qui

concerne la normalisation électrotechnique.

Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont

décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents

critères d'approbation requis pour les différents types de documents ISO. Le présent document a été

rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir www

.iso .org/ directives).

L'attention est attirée sur le fait que certains des éléments du présent document peuvent faire l'objet de

droits de propriété intellectuelle ou de droits analogues. L'ISO ne saurait être tenue pour responsable

de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant

les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de

l'élaboration du document sont indiqués dans l'Introduction et/ou dans la liste des déclarations de

brevets reçues par l'ISO (voir www .iso .org/ brevets).

Les appellations commerciales éventuellement mentionnées dans le présent document sont données

pour information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un

engagement.

Pour une explication de la nature volontaire des normes, la signification des termes et expressions

spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion

de l'ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles

techniques au commerce (OTC), voir www .iso .org/ avant -propos.

Le présent document a été élaboré par le comité technique ISO/TC 138, Tubes, raccords et robinetterie en

matières plastiques pour le transport des fluides, sous-comité SC 4, Tubes et raccords en matières plastiques

pour réseaux de distribution de combustibles gazeux, en collaboration avec le comité technique CEN/

TC 155, Systèmes de canalisations et de gaines en plastiques, conformément à l'Accord de coopération

technique entre l'ISO et le CEN (Accord de Vienne).

Cette deuxième édition annule et remplace la première édition (ISO 16486-2:2012), qui a fait l’objet

d’une révision technique. Elle incorpore également l’ISO 16486-2:2012/Amd 1:2014.

Les principales modifications par rapport à l’édition précédente sont les suivantes:

— les Tableaux 1 et 2 sont étendus jusqu’aux diamètres extérieurs nominaux inférieurs ou égaux à

630 mm;

— dans le Tableau 2, la durée est passée de 6 h à 16 h, en accord avec ce qui est indiqué dans l'en-tête

du tableau;

— dans le Tableau 3, la plage d’épaisseur de paroi minimale est étendue jusqu’à 37 mm inclus;

— le Tableau 4 permet, pour e > 12 mm, d’utiliser une éprouvette du type 3 avec 10 mm/min pour la

détermination de l’allongement à la rupture;

— l’Annexe A informative – Mode opératoire de soudage bout à bout pour l’assemblage de tubes en

PA-U – a été supprimée;

— une nouvelle Annexe A normative – Technique d’obturation par écrasement – a été ajoutée;

— une nouvelle Annexe B informative – Exemples d’absorption d’eau dans le temps en fonction de

l’épaisseur de l’échantillon – a été ajoutée.
iv © ISO 2020 – Tous droits réservés
---------------------- Page: 4 ----------------------
ISO 16486-2:2020(F)

Une liste de toutes les parties de la série ISO 16486 se trouve sur le site web de l’ISO.

Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent

document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes

se trouve à l’adresse www .iso .org/ fr/ members .html.
© ISO 2020 – Tous droits réservés v
---------------------- Page: 5 ----------------------
ISO 16486-2:2020(F)
Introduction

Le présent document spécifie les exigences pour un système de canalisations et ses composants en

polyamide non plastifié (PA-U) destiné à être utilisé pour la distribution de combustibles gazeux.

Les exigences et les méthodes d’essai pour la matière et les composants autres que les tubes du système

de canalisations sont spécifiées dans l’ISO 16486-1, l’ISO 16486-3 et l’ISO 16486-4.

Les caractéristiques d’aptitude à l’emploi du système et les paramètres de soudage sont traités dans

l’ISO 16486-5.

Les pratiques recommandées pour l’installation sont données dans l’ISO 16486-6, qui n’est pas

transposée comme Norme européenne dans le cadre de l’Accord de Vienne.

L’évaluation de la conformité du système fera l'objet de la future ISO/TS 16486-7 .

NOTE Les pratiques recommandées pour l’installation sont aussi données dans le CEN/TS 12007-6, qui a été

élaboré par le Comité technique CEN/TC 234 Infrastructures gazières.

Les parties 1, 2 (le présent document), 3, 5 et 6 (ainsi que la future partie 7) de la série ISO 16486 ont

été élaborées par l’ISO/TC 138/SC 4. La Partie 4 a été élaborée par l’ISO/TC 138/SC 7.

1) En cours de préparation. Stade au moment de la publication: ISO/WD TS 16486-7:2020.

vi © ISO 2020 – Tous droits réservés
---------------------- Page: 6 ----------------------
NORME INTERNATIONALE ISO 16486-2:2020(F)
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 2:
Tubes
1 Domaine d’application

Le présent document spécifie les propriétés physiques et mécaniques des tubes en polyamide non

plastifié (PA-U) conformément à l’ISO 16486-1, destinés à être enterrés et utilisés pour la distribution de

combustibles gazeux. Il spécifie également les paramètres d’essai pour les méthodes d’essai auxquelles

il fait référence.

La série de normes ISO 16486 s’applique aux systèmes de canalisations en PA-U dont les composants

sont raccordés par des assemblages par soudage et/ou par des assemblages mécaniques.

De plus, ce document définit les caractéristiques dimensionnelles et les exigences pour le marquage

des tubes.

Les tubes conformes au présent document sont généralement assemblés par des techniques mécaniques,

par électrosoudage ou par soudage bout à bout.
2 Références normatives

Les documents suivants sont cités dans le texte de sorte qu’ils constituent, pour tout ou partie de leur

contenu, des exigences du présent document. Pour les références datées, seule l’édition citée s’applique.

Pour les références non datées, la dernière édition du document de référence s'applique (y compris les

éventuels amendements).
ISO 291, Plastiques — Atmosphères normales de conditionnement et d'essai
ISO 307, Plastiques — Polyamides — Détermination de l'indice de viscosité

ISO 1133-2, Plastiques — Détermination de l'indice de fluidité à chaud des thermoplastiques, en masse

(MFR) et en volume (MVR) — Partie 2: Méthode pour les matériaux sensibles à l'historique temps-

température et/ou à l'humidité

ISO 1167-1, Tubes, raccords et assemblages en matières thermoplastiques pour le transport des fluides —

Détermination de la résistance à la pression interne — Partie 1: Méthode générale

ISO 1167-2, Tubes, raccords et assemblages en matières thermoplastiques pour le transport des fluides —

Détermination de la résistance à la pression interne — Partie 2: Préparation des éprouvettes tubulaires

ISO 2505, Tubes en matières thermoplastiques — Retrait longitudinal à chaud — Méthode d'essai et

paramètres

ISO 3126, Systèmes de canalisations en plastiques — Composants en plastiques — Détermination des

dimensions

ISO 6259-1, Tubes en matières thermoplastiques — Détermination des caractéristiques en traction —

Partie 1: Méthode générale d'essai
© ISO 2020 – Tous droits réservés 1
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ISO 16486-2:2020(F)

ISO 6259-3, Tubes en matières thermoplastiques — Détermination des caractéristiques en traction —

Partie 3: Tubes en polyoléfines

ISO 11922-1, Tubes en matières thermoplastiques pour le transport des fluides — Dimensions et

tolérances — Partie 1: Série métrique

ISO 12176-4, Tubes et raccords en matières plastiques — Appareillage pour l'assemblage par soudage des

systèmes en polyéthylène — Partie 4: Codage de la traçabilité

ISO 13477, Tubes en matières thermoplastiques pour le transport des fluides — Détermination de la

résistance à la propagation rapide de la fissure (RCP) — Essai à petite échelle à état constant (essai S4)

ISO 13479, Tubes en polyoléfines pour le transport des fluides — Détermination de la résistance à la

propagation de la fissure — Méthode d’essai de la propagation lente de la fissure d’un tube entaillé (essai

d’entaille)

ISO 16486-1:2020, 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 1:Généralités

EN 12106, Systèmes de canalisations en plastique — Tubes en polyéthylène (PE) — Méthode d’essai de

résistance à la pression interne après application de l’écrasement
3 Termes et définitions

Pour les besoins du présent document, les termes et définitions donnés dans l’ISO 16486-1, ainsi que les

suivants, s’appliquent.

L’ISO et l’IEC tiennent à jour des bases de données terminologiques destinées à être utilisées en

normalisation, consultables aux adresses suivantes:

— ISO Online browsing platform: disponible à l’adresse https:// www .iso .org/ obp

— IEC Electropedia: disponible à l’adresse http:// www .electropedia .org/
3.1.1
faux-rond

〈tube ou raccord〉 différence entre le diamètre extérieur maximal mesuré et le diamètre extérieur

minimal mesuré dans le même plan de section transversale d'un tube ou du bout mâle d'un raccord

3.1.2
matière vierge

matière sous forme de granulés ou de poudre qui n’a pas été préalablement transformée autrement que

pour son mélangeage, et à laquelle il n’a été ajouté aucune matière rebroyée ou recyclable

3.1.3
obturation par écrasement

écoulement de gaz restreint par écrasement du tube, lorsque celui-ci est comprimé entre deux mâchoires

de telle sorte que l’écartement entre elles soit inférieur à deux fois l’épaisseur de paroi nominale

3.2 Abréviations
MVR indice de fluidité à chaud en volume
SDR rapport des dimensions nominales
4 Composition

La composition utilisée pour fabriquer les tubes doit être conforme à l’ISO 16486-1.

2 © ISO 2020 – Tous droits réservés
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ISO 16486-2:2020(F)

Les tubes doivent être fabriqués à partir de matière vierge. La matière rebroyée ne doit pas être utilisée.

5 Caractéristiques générales
5.1 Aspect

Les surfaces internes et externes des tubes, examinées sans grossissement, doivent être lisses, propres

et exemptes de stries, cavités, et autres défauts superficiels susceptibles d’altérer les performances du

tube. Les extrémités des tubes doivent être coupées nettement et perpendiculairement à l’axe du tube.

5.2 Couleur
La couleur des tubes doit être jaune ou noire.

NOTE En outre, les tubes PA-U noirs peuvent être identifiés par des bandes jaunes ou oranges, selon la

préférence nationale.
5.3 Compatibilité au soudage

Les tubes en PA-U 11 doivent être uniquement assemblés par fusion à des tubes et/ou des composants

en PA-U 11.

Les tubes en PA-U 12 doivent être uniquement assemblés par fusion à des tubes et/ou des composants

en PA-U 12.

Les tubes en PA-U ne sont pas compatibles pour le soudage avec des tubes et/ou des composants

fabriqués à partir d’autres polymères.

NOTE Les méthodes d’essai pour assurer la soudabilité sont données dans l’ISO 16486-3 et l’ISO 16486-5.

6 Caractéristiques géométriques
6.1 Mesurage des dimensions

Les dimensions doivent être mesurées conformément à l’ISO 3126 à (23 ± 2) °C, après un conditionnement

pendant au moins 4 h. Le mesurage ne doit pas être effectué moins de 24 h après la fabrication.

6.2 Diamètres extérieurs moyens, faux-rond et le
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 16486-2
ISO/TC 138/SC 4
Plastics piping systems for the supply
Secretariat: NEN
of gaseous fuels — Unplasticized
Voting begins on:
2020-06-08 polyamide (PA-U) piping systems
with fusion jointing and mechanical
Voting terminates on:
2020-08-03
jointing —
Part 2:
Pipes
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 2: Tubes
ISO/CEN PARALLEL PROCESSING
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 16486-2:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2020
---------------------- Page: 1 ----------------------
ISO/FDIS 16486-2:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© 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

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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 16486-2:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

3.2 Abbreviated terms ............................................................................................................................................................................... 2

4 Compound ................................................................................................................................................................................................................... 2

5 General characteristics .................................................................................................................................................................................. 2

5.1 Appearance ................................................................................................................................................................................................ 2

5.2 Colour .............................................................................................................................................................................................................. 3

5.3 Fusion compatibility .......................................................................................................................................................................... 3

6 Geometrical characteristics ...................................................................................................................................................................... 3

6.1 Measurement of dimensions ....................................................................................................................................................... 3

6.2 Mean outside diameters, out-of-roundness and their tolerances ............................................................... 3

6.3 Wall thicknesses and tolerances .............................................................................................................................................. 4

6.3.1 Minimum wall thickness ........................................................................................................................................... 4

6.3.2 Tolerances on wall thickness at any point ................................................................................................. 5

7 Mechanical characteristics ........................................................................................................................................................................ 6

7.1 Conditioning .............................................................................................................................................................................................. 6

7.2 Requirements ........................................................................................................................................................................................... 6

8 Physical characteristics ................................................................................................................................................................................. 8

8.1 Conditioning .............................................................................................................................................................................................. 8

8.2 Requirements ........................................................................................................................................................................................... 8

9 Marking .......................................................................................................................................................................................................................... 9

Annex A (normative) Squeeze-off technique ............................................................................................................................................10

Annex B (informative) Examples of the water uptake over time as a function of the sample

thickness ....................................................................................................................................................................................................................11

Bibliography .............................................................................................................................................................................................................................14

© ISO 2020 – All rights reserved iii
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ISO/FDIS 16486-2:2020(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 16486-2:2012), which has been

technically revised. It also incorporates ISO 16486-2:2012/Amd 1: 2014.
The main changes compared to the previous edition are as follows:

— Tables 1 and 2 are extended with nominal outside diameters up to and including 630 mm;

— In Table 2, former 6 hours has been changed to 16 hours in line with the phrasing in the table header;

— In Table 3, the range for the minimum wall thickness is extended up to and including 37 mm;

— Table 4 allows for e > 12 mm to use Type 3 specimen with 10 mm/min for the determination of the

elongation at break;

— Informative Annex A – Butt fusion procedure for jointing PA-U pipes – has been deleted;

— A new normative Annex A – Squeeze-off technique – has been added;

— A new informative Annex B – Examples of the water uptake over time as a function of the sample

thickness – has been added.
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 2020 – All rights reserved
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ISO/FDIS 16486-2:2020(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 pipes of the piping system are

specified in ISO 16486-1, ISO 16486-3, 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.

Assessment of conformity of the system is to form the subject of prEN ISO 16486-7.

Recommended practice for installation is also given in CEN/TS 12007-6, which has been prepared by

Technical Committee CEN/TC 234, Gas infrastructure.

A list of ASTM standards related to polyamide pipes and fittings for the supply of gas is given in the

[1][2][3][4]
Bibliography .

Parts 1 to 7 of the ISO 16486 series have been prepared by ISO/TC 138/SC4, with the exception of Part

4, which has been prepared by ISO/TC 138/SC 7.
© ISO 2020 – All rights reserved v
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 16486-2:2020(E)
Plastics piping systems for the supply of gaseous fuels —
Unplasticized polyamide (PA-U) piping systems with fusion
jointing and mechanical jointing —
Part 2:
Pipes
1 Scope

This document specifies the physical and mechanical properties of pipes 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 of standards 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 pipes.

Pipes conforming to this document are jointed typically by using mechanical, electrofusion or butt

fusion techniques.
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 1167-2, 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 2505, Thermoplastics pipes — Longitudinal reversion — Test method and parameters

ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions

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 11922-1, Thermoplastics pipes for the conveyance of fluids — Dimensions and tolerances — Part 1:

Metric series

ISO 12176-4, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 4:

Traceability coding
© ISO 2020 – All rights reserved 1
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ISO/FDIS 16486-2:2020(E)

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 13479, Polyolefin pipes for the conveyance of fluids — Determination of resistance to crack

propagation — Test method for slow crack growth on notched pipes

ISO 16486-1:2020, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-

U) piping systems with fusion jointing and mechanical jointing — Part 1: General

EN 12106, Plastics piping systems - Polyethylene (PE) and crosslinked polyethylene (PE-X) pipes - Test

method for the resistance to internal pressure after application of squeeze-off
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/
3.1.1
out-of-roundness

〈pipe or fitting〉 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

3.1.2
virgin material

material in a form such as granules or powder that has not been previously processed other than for

compounding and to which no rework material or recyclable material has been added

3.1.3
squeeze-off

gas flow restricted by squeezing the pipe when compressed between two clamps in such a way that the

distance between both clamps is less than twice the nominal wall thickness
3.2 Abbreviated terms
MVR melt volume-flow rate
SDR standard dimension ratio
4 Compound

The compound from which the pipes are made shall be in accordance with ISO 16486-1.

The pipes shall be made from virgin material. Rework material shall not be used.
5 General characteristics
5.1 Appearance

When viewed without magnification, the internal and external surfaces of pipes shall be smooth, clean

and free from scoring, cavities and other surface defects which can affect pipe performance. The pipe

ends shall be cut cleanly and square to the axis of the pipe.
2 © ISO 2020 – All rights reserved
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ISO/FDIS 16486-2:2020(E)
5.2 Colour
The colour of the pipes shall be yellow or black.
5.3 Fusion compatibility

Pipes made from PA-U 11 shall be heat fusion jointed only to pipes and/or components made from PA-U 11.

Pipes made from PA-U 12 shall be heat fusion jointed only to pipes and/or components made from

PA-U 12.

Pipes made from PA-U are not fusion compatible with pipes and/or components made from other

polymers.

NOTE Test methods for assuring fusibility are given in ISO 16486-3 and ISO 16486-5.

6 Geometrical characteristics
6.1 Measurement of dimensions

Dimensions shall be measured in accordance with ISO 3126 at (23 ± 2) °C, after being conditioned for at

least 4 h. The measurement shall not be made less than 24 h after manufacture.
6.2 Mean outside diameters, out-of-roundness and their tolerances

The mean outside diameter of the pipe, d , and the out-of-roundness and their tolerances shall be in

accordance with Table 1.
For maximum mean outside diameter grade B tolerances, ISO 11922-1 shall apply.
Table 1 — Mean outside diameters and out-of-roundness
Dimensions in millimetre
...

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