SIST EN 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 (ISO 16486-1:2020)

This part of ISO 16486 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.
ISO 16486 is applicable to PA-U piping systems the components of which are connected by fusion jointing and/or mechanical jointing

Kunststoff-Rohrleitungssysteme für die Gasversorgung - Rohrleitungssysteme aus weichmacherfreiem Polyamid (PA-U) mit Schweißverbindungen und mechanischen Verbindungen - Teil 1: Allgemeines (ISO 16486-1:2020)

Dieses Dokument legt die allgemeinen Eigenschaften von weichmacherfreien Polyamid (PA U)-Formmassen für die Herstellung von Rohren, Formstücken und Armaturen aus diesen Formmassen fest, die unterirdisch verlegt und für den Transport von gasförmigen Brennstoffen verwendet werden. Es spezifiziert ebenso die Prüfparameter für die Prüfverfahren, auf die es sich bezieht.
Die Normenreihe ISO 16486 gilt für PA U Rohrleitungssysteme, deren Komponenten durch Schweißverbindungen und/oder mechanische Verbindungen zusammengefügt werden.
Dieses Dokument legt ein Berechnungs  und ein Auslegungsschema als Grundlage für die Bestimmung des maximalen Betriebsdrucks (MOP, en: maximum operating pressure) eines PA U Rohrleitungssystems fest.

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 16486-1:2020)

Le présent document spécifie les exigences pour la bonne intégration avec d’autres composants et systèmes microfluidiques, afin de faciliter le processus de conception de nouveaux dispositifs microfluidiques (par exemple, puces, capteurs, actionneurs, connecteurs microfluidiques).
Le présent document est applicable aux dispositifs dans le domaine de la microfluidique nécessitant des interconnexions microfluidiques.

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 16486-1:2020)

General Information

• Status: Published
• Public Enquiry End Date: 19-Dec-2019
• Publication Date: 04-Oct-2020
• ICS: 75.200 - Petroleum products and natural gas handling equipment
• ICS: 83.140.30 - Plastics pipes and fittings for non fluid use
• Technical Committee: PCV - Plastic pipes, fittings and valves
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 24-Sep-2020
• Due Date: 29-Nov-2020
• Completion Date: 05-Oct-2020
• Ref Project: EN 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 (ISO 16486-1:2020)

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 16486-1:2020
01-november-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 16486-1:2020)

Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U)

piping systems with fusion jointing and mechanical jointing - Part 1: General (ISO 16486-

1:2020)
Kunststoff-Rohrleitungssysteme für die Gasversorgung - Rohrleitungssysteme aus
weichmacherfreiem Polyamid (PA-U) mit Schweißverbindungen und mechanischen
Verbindungen - Teil 1: Allgemeines (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 (ISO
16486-1:2020)
Ta slovenski standard je istoveten z: EN ISO 16486-1:2020
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
SIST EN ISO 16486-1:2020 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 16486-1:2020
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SIST EN ISO 16486-1:2020
EN ISO 16486-1
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2020
EUROPÄISCHE NORM
ICS 75.200; 83.140.30
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 16486-1:2020)

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 16486-1:2020) 16486-1:2020)
This European Standard was approved by CEN on 14 August 2020.

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, Turkey 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

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16486-1:2020 E

worldwide for CEN national Members.
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SIST EN ISO 16486-1:2020
EN ISO 16486-1:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 16486-1:2020
EN ISO 16486-1:2020 (E)
European foreword

This document (EN ISO 16486-1:2020) 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 March 2021, and conflicting national standards shall

be withdrawn at the latest by March 2021.

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.

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, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 16486-1:2020 has been approved by CEN as EN ISO 16486-1:2020 without any

modification.
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SIST EN ISO 16486-1:2020
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SIST EN ISO 16486-1:2020
INTERNATIONAL ISO
STANDARD 16486-1
Second edition
2020-08
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 16486-1:2020(E)
ISO 2020
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SIST EN ISO 16486-1:2020
ISO 16486-1:2020(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: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
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SIST EN ISO 16486-1:2020
ISO 16486-1:2020(E)
Contents Page

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

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

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

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

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

3.1 Geometrical characteristics ......................................................................................................................................................... 2

3.2 Materials ....................................................................................................................................................................................................... 3

3.3 Material characteristics ................................................................................................................................................................... 4

3.4 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 Rework 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) Assessment of degree of pigment or carbon black dispersion

in unplasticized polyamide compounds ...................................................................................................................................11

Annex B (normative) Chemical resistance ..................................................................................................................................................15

Annex C (normative) Hoop stress at burst ..................................................................................................................................................18

Annex D (informative) Continuous liquid hydrocarbon exposure from transported fluid or

soil contamination ...........................................................................................................................................................................................20

Annex E (informative) Permeation resistance against different gases ..........................................................................21

Bibliography .............................................................................................................................................................................................................................24

© ISO 2020 – All rights reserved iii
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SIST EN ISO 16486-1:2020
ISO 16486-1:2020(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 16486-1:2012), which has been

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

— In subclause 5.2.5 characteristics include the need to saturate pipes for LTHS testing;

— In Table 1 the Carbon black content is changed to (1,0 to 2,5) % (by mass);

— In Table 2 former 6 hours has been changed to 16 hours for conditioning before hydrostatic strength

testing in line with the phrasing in the table header;
— In subclause 5.2.6 change of compound refers to PPI TR-3 as guidance;

— A new informative Annex D – Continuous liquid hydrocarbon exposure from transported fluid or

soil contamination – has been added;

— A new informative Annex E – Permeation resistance against different gases – 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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SIST EN ISO 16486-1:2020
ISO 16486-1:2020(E)
Introduction

This document specifies the general requirements for a piping system and its components made from

unplasticized polyamide (PA-U), which are intended to be used for the supply of gaseous fuels.

Requirements and test methods for components of the piping system are specified in ISO 16486-2,

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 the future ISO/TS 16486-7 .

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.

NOTE 2 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 (this document), 2, 3, 5 and 6 (and future Part 7) have been prepared by ISO/TC 138/SC 4. 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
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SIST EN ISO 16486-1:2020
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SIST EN ISO 16486-1:2020
INTERNATIONAL STANDARD ISO 16486-1:2020(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.
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 1110, Plastic — Polyamides — Accelerated conditioning of test specimens

ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of

the resistance to internal pressure — Part 1: General method

ISO 1167-2, 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 1183-2, Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density

gradient column method
© ISO 2020 – All rights reserved 1
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SIST EN ISO 16486-1:2020
ISO 16486-1:2020(E)

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 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,

marking of products 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 16486-5, Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U)

piping systems with fusion jointing and mechanical jointing — Part 5: Fitness for purpose of the system

ISO 16871, Plastics piping and ducting systems — Plastics pipes and fittings — Method for exposure to

direct (natural) weathering
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 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 Geometrical characteristics
3.1.1
nominal outside diameter

specified outside diameter of a component, which is identical to the minimum mean outside diameter

(3.1.4), d
em,min
Note 1 to entry: Expressed in millimetres.
2 © ISO 2020 – All rights reserved
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SIST EN ISO 16486-1:2020
ISO 16486-1:2020(E)
3.1.2
outside diameter at any point

outside diameter measured through the cross-section at any point on a pipe, or the spigot end of a

fitting, rounded up to the nearest 0,1 mm
3.1.3
mean outside diameter

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
3.1.4
minimum mean outside diameter
em,min

minimum value for the mean outside diameter (3.1.3) as specified for a given nominal size

3.1.5
maximum mean outside diameter
em,max

maximum value for the mean outside diameter (3.1.3) as specified for a given nominal size

3.1.6
nominal wall thickness
wall thickness, in millimetres, corresponding to the minimum wall thickness, e
min
3.1.7
wall thickness at any point

measured wall thickness at any point around the circumference of a component, rounded up to the

nearest 0,1 mm
3.1.8
minimum wall thickness at any point
min

minimum value for the wall thickness at any point (3.1.7) around the circumference of a component, as

specified
3.1.9
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 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
rework material

material from a manufacturer's own production (of compounds [3.2.1] and of pipes, fittings or valves)

that has been reground or pelletized for reuse by that same manufacturer
© ISO 2020 – All rights reserved 3
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SIST EN ISO 16486-1:2020
ISO 16486-1:2020(E)
3.3 Material characteristics
3.3.1
lower confidence limit of the predicted hydrostatic strength
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
[5] [6]

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).
θ,t

Note 2 to entry: Temperature, θ, is expressed in degrees Celsius and time, t, is expressed in years.

[5] [6]

Note 3 to entry: The R10 series conforms to ISO 3 and the R20 series conforms to ISO 497 .

3.3.4
design coefficient

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
3.3.5
design stress
s,θ,t

stress derived by dividing the MRS (3.3.2) or CRSθ,t (3.3.3) by the design coefficient (3.3.4), C, i.e.

σ = MRS/C, or σ = CRS /C
s s,θ,t θ,t
3.4 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)

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 © ISO 2020 – All rights reserved
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SIST EN ISO 16486-1:2020
ISO 16486-1:2020(E)
4 Symbols and abbreviated terms
4.1 Symbols
a charpy notched impact strength
C design coefficient
d outside diameter at any point
d mean outside diameter
d maximum mean outside diameter
em,max
d minimum mean outside diameter
em,min
d nominal outside diameter
e wall thickness at any point
e minimum wall thickness at any point
min
e nominal wall thickness
L length
P pressure at burst
p critical pressure
Σ is the hoop stress to be induced by the pressure at burst
σ lower confidence limit of the predicted hydrostatic strength
LPL
σ design stress

NOTE 1 The symbols d and e correspond to d and e given in other International Standards, e.g.

e ey y
[7]
ISO 11922-1 .
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 2020 – All rights reserved 5
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SIST EN ISO 16486-1:2020
ISO 16486-1:2020(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 ISO 16396-1.
5.2 Compound
5.2.1 Additives

The compound shall be made of the PA-U base polymer to which are added only those additives that

are needed to facilitate the manufacture of pipes and fittings conforming to the applicable parts of

ISO 16486.
5.2.2 Colour
The colour of the compound shall be yellow or black.

The carbon black used in the production of black compound shall have an average (primary) particle

size of 10 nm to 25 nm.
5.2.3 Identification compound

When applicable, the compound used for identification stripes shall be manufactured from a PA-U

polymer manufactured from the same type of base polymer as used in the compound for pipe

production.
When applicable, the compound used for an
...