ISO 16486-1:2012

Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing — Part 1: General

ISO 16486-1:2012 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. ISO 16486-1:2012 establishes a calculation and design scheme on which to base the maximum operating pressure (MOP) of a PA-U piping system.

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

General Information

• Status: Withdrawn
• Publication Date: 03-Jun-2012
• Withdrawal Date: 03-Jun-2012
• ICS: 75.200 - Petroleum products and natural gas handling equipment
• ICS: 83.140.30 - Plastics pipes and fittings for non fluid use
• Technical Committee: ISO/TC 138/SC 4 - Plastics pipes and fittings for the supply of gaseous fuels
• Drafting Committee: ISO/TC 138/SC 4 - Plastics pipes and fittings for the supply of gaseous fuels
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 18-Aug-2020

Relations

• Revised: 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
• Effective Date: 15-Jul-2017
• Amended By: ISO 16486-1:2012/Amd 1:2014 - Plastics piping systems for the supply of gaseous fuels - Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing — Part 1: General — Amendment 1
• Effective Date: 07-Aug-2021
• Revises: ISO 22621-1:2007 - Plastics piping systems for the supply of gaseous fuels for maximum operating pressures up to and including 2 MPa (20 bar) — Polyamide (PA) — Part 1: General
• Effective Date: 26-Jun-2010

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 16486-1
First edition
2012-06-01
Plastics piping systems for the supply of
gaseous fuels — Unplasticized polyamide
(PA-U) piping systems with fusion
jointing and mechanical jointing —
Part 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 16486-1:2012(E)
©
ISO 2012

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ISO 16486-1:2012(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
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Published in Switzerland
ii © ISO 2012 – All rights reserved

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ISO 16486-1:2012(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 . 5
5.1 Material of the components . 5
5.2 Compound . 5
5.3 Fusion compatibility . 8
5.4 Classification and designation . 8
5.5 Maximum operating pressure (MOP) . 9
Annex A (normative) Assessment of degree of pigment or carbon black dispersion in unplasticized
polyamide compounds .10
Annex B (normative) Chemical resistance .14
Annex C (normative) Hoop stress at burst .17
Bibliography .19
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ISO 16486-1:2012(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 16486-1 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the
transport of fluids, Subcommittee SC 4, Plastics pipes and fittings for the supply of gaseous fuels.
This first edition of ISO 16486-1 cancels and replaces the first edition of ISO 22621-1:2007 which has been
technically revised.
ISO 16486 consists of the following parts, under the general title Plastics piping systems for the supply of
gaseous fuels — Unplasticized polyamide (PA-U) piping systems with fusion jointing and mechanical jointing:
— Part 1: General
— Part 2: Pipes
— Part 3: Fittings
— Part 5: Fitness for purpose of the system
— Part 6: Code of practice for design, handling and installation
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ISO 16486-1:2012(E)
Introduction
Thin wall thickness unplasticized polyamide (PA-U) pipes and solvent cement joints are used typically for low
pressures, while thicker wall thickness pipes and butt fusion, electrofusion or mechanical joints are typically
used for high pressures.
For technical and safety reasons, it is not possible to mix the components of the two types of piping system
(thin wall thickness pipes cannot be jointed by butt fusion or mechanical joints and vice versa). In particular,
solvent cement joints must not be used for jointing for high pressure piping systems.
So for the time being, the standardization programme dealing with unplasticized polyamide (PA-U) piping
systems for the supply of gaseous fuels is split into two series of International Standards, with one series
(ISO 17467) covering piping systems the components of which are connected by solvent cement jointing and
the other (ISO 16486) the components of which are connected by fusion jointing and/or mechanical jointing.
When more experience will be gained from the field, it might be reasonable to merge the ISO 17467 series and
the ISO 16486 series in one single series applicable to PA-U piping systems.
A similar series (ISO 17135) for fusion and mechanically jointed plasticized polyamide (PA-P) piping systems
is in preparation.
NOTE A list of standards related to polyamide pipes and fittings for the supply of gas is given in the Bibliography.
See References [6] to [9].
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INTERNATIONAL STANDARD ISO 16486-1:2012(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 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.
This part of ISO 16486 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, in whole or in part, are normatively referenced in this document and are indispensable
for its application. For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
ISO 179-1:2010, 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 pyknometer method and titration method
ISO 1183-2, Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density gradient
column method
ISO 1874-1, Plastics — Polyamide (PA) moulding and extrusion materials — Part 1: Designation system and
basis for specification
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ISO 16486-1:2012(E)
ISO 1874-2, Plastics — Polyamide (PA) moulding and extrusion materials — Part 2: Preparation of test
specimens and determination of properties
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 and basic specification
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 13478:2007, 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 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 1874-1,
and the following apply.
3.1 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
in millimetres
NOTE The nominal inside diameter of a socket is equal to the nominal outside diameter of the corresponding pipe.
3.1.2
outside diameter at any point
d
e
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
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ISO 16486-1:2012(E)
3.1.3
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
3.1.4
minimum mean outside diameter
d
em,min
minimum value for the mean outside diameter as specified for a given nominal size
3.1.5
maximum mean outside diameter
d
em,max
maximum value for the mean outside diameter as specified for a given nominal size
3.1.6
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
3.1.7
out-of-roundness
〈socket〉 difference between the measured maximum inside diameter and the measured minimum inside
diameter in the same cross-sectional plane of a socket
3.1.8
nominal wall thickness
e
n
wall thickness, in millimetres, corresponding to the minimum wall thickness, e
min
3.1.9
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
3.1.10
minimum wall thickness at any point
e
min
minimum value for the wall thickness at any point around the circumference of a component, as specified
3.1.11
standard dimension ratio
SDR
ratio of the nominal outside diameter, 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 and
others, at a dosage level necessary for the processing and use of components conforming to the requirements
of this part of ISO 16486
3.2.2
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
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ISO 16486-1:2012(E)
3.2.3
rework material
material from a manufacturer’s own production (of compounds and of pipes, fittings or valves) that has been
reground or pelletized for reuse by that same manufacturer
3.3 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 The quantity is expressed in megapascals (MPa).
NOTE 2 Temperature, θ, is expressed in degrees Celsius and time, t, is expressed in years.
3.3.2
minimum required strength
MRS
value of σ at 20 °C and 50 years, rounded down to the next smaller value of the R10 series or the R20 series
LPL
[1] [2]
NOTE 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 at temperature θ and time t, rounded down to the next smaller value of the R10 series or the R20 series
LPL
NOTE 1 CRS at 20 °C and 50 years equals MRS.
θ,t
NOTE 2 Temperature, θ, is expressed in degrees Celsius and time, t, is expressed in years.
[1] [2]
NOTE 3 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
3.3.5
design stress
σ
s
σ
s,θ,t
stress derived by dividing the MRS or CRS by the design coefficient C, i.e. σ = MRS/C, or σ = CRS /C
θ,t 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 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.
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ISO 16486-1:2012(E)
4 Symbols and abbreviated terms
4.1 Symbols
C design coefficient
d outside diameter at any point
e
d mean outside diameter
em
d maximum mean outside diameter
em,max
d minimum mean outside diameter
em,min
d nominal outside diameter
n
e wall thickness at any point
e minimum wall thickness at any point
min
e nominal wall thickness
n
σ design stress
s
σ lower confidence limit of the predicted hydrostatic strength
LPL
p critical pressure
c
[3]
NOTE 1 The symbols d and e correspond to d and e given in other International Standards such as ISO 11922-1 .
e ey y
NOTE 2 Additional symbols specific to Annex C are defined therein.
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
SDR standard dimension ratio
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 1874-1.
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.
All additives shall be used according to national regulations.
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ISO 16486-1:2012(E)
5.2.2 Colo
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