ISO 17467-1:2012
(Main)Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U) piping systems jointed by solvent cement — Part 1: General
Plastics piping systems for the supply of gaseous fuels — Unplasticized polyamide (PA-U) piping systems jointed by solvent cement — Part 1: General
ISO 17467-1:2012 specifies the general properties of unplasticized polyamide (PA-U) compounds for the manufacturing of pipes, fittings and valves made from such compounds, intended to be buried and used for the supply of gaseous fuels for maximum operating pressure up to and including 4 bar. It also specifies the test parameters for the test methods to which it refers, and specifies a calculation and design scheme on which the maximum operating pressure (MOP) of piping systems is based.
Systèmes de canalisations en matières plastiques pour la distribution de combustibles gazeux — Systèmes de canalisations en polyamide non plastifié (PA-U) avec assemblage par collage — Partie 1: Généralités
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 17467-1
First edition
2012-10-15
Plastics piping systems for the supply
of gaseous fuels — Unplasticized
polyamide (PA-U) piping systems
jointed by solvent cement —
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 assemblage par collage —
Partie 1: Généralités
Reference number
ISO 17467-1:2012(E)
©
ISO 2012
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ISO 17467-1:2012(E)
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ii © ISO 2012 – All rights reserved
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ISO 17467-1:2012(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
3.1 Geometrical definitions . 2
3.2 Definitions of materials . 3
3.3 Definitions related to material characteristics . 4
3.4 Definitions related to service conditions . 5
4 Symbols and abbreviated terms . 5
4.1 Symbols . 5
4.2 Abbreviations . 5
5 Material . 6
5.1 Material of the components . 6
5.2 Compound . 6
5.3 Classification and designation . 9
5.4 Maximum operating pressure MOP .10
Annex A (normative) Assessment of the degree of pigment or carbon black dispersion in
unplasticized polyamide compounds .11
Annex B (normative) Chemical resistance .15
Annex C (informative) Design guidance .18
Annex D (normative) Hoop stress at burst.21
Bibliography .23
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ISO 17467-1:2012(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 17467-1 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 17467-1 cancels and replaces the first edition of ISO 15439-1:2007, which has
been technically revised.
ISO 17467 consists of the following parts, under the general title Plastics piping systems for the supply of
gaseous fuels — Unplasticized polyamide (PA-U) piping systems jointed by solvent cement:
— Part 1: General
— Part 2: Pipes
— Part 3: Fittings
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ISO 17467-1:2012(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 standardisation 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 ISO 17467 series and ISO 16486 series in one single series applicable to PA-U piping systems.
A similar series (ISO 17135) of International Standards 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 [1] to [8].
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INTERNATIONAL STANDARD ISO 17467-1:2012(E)
Plastics piping systems for the supply of gaseous fuels —
Unplasticized polyamide (PA-U) piping systems jointed by
solvent cement —
Part 1:
General
1 Scope
This part of ISO 17467 specifies the general properties of unplasticized polyamide (PA-U) compounds
for the manufacturing of pipes, fittings and valves made from such compounds, intended to be buried
and used for the supply of gaseous fuels for maximum operating pressure up to and including 4 bar.
It also specifies the test parameters for the test methods to which it refers.
This part of ISO 17467 specifies a calculation and design scheme on which the maximum operating
pressure (MOP) of piping systems is based.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 179-1, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented impact test
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 307, Plastics — Polyamides — Determination of viscosity number
ISO 472, Plastics — Vocabulary
ISO 527-1, Plastics — Determination of tensile properties — Part 1: General principles
ISO 527-2, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and
extrusion plastics
ISO 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special
characteristics
ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 1: General method
ISO 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 2: Preparation of pipe test pieces
ISO 1167-4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 4: Preparation of assemblies
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
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ISO 17467-1:2012(E)
ISO 1874-1, Plastics — Polyamide (PA) moulding and extrusion materials — Part 1: Designation system and
basis for specification
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 12162:2009, 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 13480, Polyethylene pipes — Resistance to slow crack growth — Cone test method
ISO 15512, Plastics — Determination of water content
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, ISO 1874-1
and the following apply.
3.1 Geometrical definitions
NOTE The symbols d and e correspond to d and e given in other International Standards such as
e ey y
ISO 11922-1[9].
3.1.1
nominal outside diameter
d
n
specified outside diameter of a component, 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 17467-1:2012(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
difference between the measured maximum outside diameter and the measured minimum outside
diameter in the same cross-sectional plane of a pipe, or the spigot end of a fitting, or the difference
between the measured maximum inside diameter and the measured minimum inside diameter in the
same cross-sectional plane of a socket
3.1.7
nominal wall thickness
e
n
wall thickness, in millimetres, corresponding to the minimum wall thickness, e
min
3.1.8
wall thickness at any point
e
measured wall thickness at any point around the circumference of a component, rounded up to the
nearest 0,05 mm
3.1.9
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
3.1.10
standard dimension ratio
SDR
ratio of the nominal outside diameter, d , of a pipe to its nominal wall thickness, e
n n
3.2 Definitions of materials
3.2.1
compound
homogenous mixture of base polymer (PA-U) and additives, i.e. anti-oxidants, pigments, UV-stabilizers
and others, at a dosage level necessary for the processing and use of components conforming to the
requirements of this part of ISO 17467
3.2.2
virgin material
material in a form such as granules or powder, which has not been previously processed other than for
compounding and to which no rework or recyclable materials have been added
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ISO 17467-1:2012(E)
3.2.3
own reprocessable material
material prepared from rejected unused pipes, fittings and valves, including trimmings from the
production of pipes, fittings and valves, which will be reprocessed in a manufacturer’s plant after having
been previously processed by the same manufacturer by a process such as moulding or extrusion and
for which the complete formulation or compound is known
3.2.4
external reprocessable material
material comprising either one of the following forms:
a) material from rejected unused pipes, fittings or valves or trimmings therefrom, which will be
reprocessed and which were originally processed by another manufacturer;
b) material from the production of unused PA-U products other than pipes, fittings and valves,
regardless of where they are manufactured
3.2.5
recyclable material
material comprising either one of the following forms:
a) material from used pipes, fittings or valves which have been cleaned and crushed or ground;
b) material from used PA-U products other than pipes, fittings or valves which have been cleaned and
crushed or ground
3.3 Definitions related to material characteristics
3.3.1
lower confidence limit of the predicted hydrostatic strength
σ
LPL
quantity, with the dimensions of stress, which represents the 97,5 % lower confidence limit of the
predicted hydrostatic strength at a temperature θ and time t
NOTE 1 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
LPL
the R20 series
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
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ISO 17467-1:2012(E)
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 Definitions related to service conditions
3.4.1
gaseous fuel
any fuel that 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.
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
b 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
4.2 Abbreviations
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ISO 17467-1:2012(E)
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 17467.
All additives shall be used according to the national regulations.
5.2.2 Colour
The colour of the compound shall be yellow, black or natural. The natural colour is admitted only for
compounds intended to be used for manufacturing fittings and valves.
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 identification layer shall be of the same base polymer and of
the same MRS as the compound used for pipe production.
5.2.4 Reprocessable and recyclable materials
Own and external reprocessable materials and recyclable material shall not be used.
5.2.5 Characteristics
The compounds from which the components are manufactured shall be in accordance with Tables 1 and 2.
Unless otherwise specified in the applicable test method, the test pieces shall be conditioned for at least 16 h
at 23 °C and 50 % relative humidity in accordance with ISO 291 before testing in accordance with Table 2.
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ISO 17467-1:2012(E)
Table 1 — Characteristics of the compound in the form of granules
Characteristic Requirements Test parameters Test method
Density PA-U 11 compound: (1 020 to Test temperature: 23 °C ISO 1183-1
3
1 050) kg/m ISO 1183-2
PA-U 12 compound: (1 000 to
3
1 040) kg/m
Viscosity number ≥ 180 ml/g Solvent: m-Cresol ISO 307
Water content ≤ 0,10 % ISO 15512,
Method B
Carbon black content (0,5 to 1,0) % (by mass) ISO 6964
a
Pigment or carbon Clause A.3 Annex A
black dispersion
a
Only for black compound.
Table 2 — Characteristics of compound in the form of pipe/bar/assembly
Characteristic Requirements Test parameters Test method
Change in mean hoop stress
at burst between specimens
tested in reagent and in
the corresponding control
fluid ≤ 20 %
Chemical resist- OR
Shall conform to Annex B Annex B
ance Change in tensile yield
strength of injection
moulded bar specimens
tested in reagent and in
the corresponding control
fluid ≤ 20 %
The weathered test pieces Preconditioning
Resistance to
2
shall fulfil the following (weathering): Cumula- ≥ 3,5 GJ/m ISO 16871
weathering
requirements: tive solar radiation
a)
(ISO 6259-1,
a) Elongation at ISO 6259-3)
≥ 160 % Testing speed 25 mm/min
a
break or
(ISO 527-1,
b
ISO 527-2)
a
For test pieces in the form of pipe.
b
For test pieces in the form of injection moulded bar prepared according to ISO 1874-2.
c
The critical pressure, p shall be determined for each new PA-U compound and for every pipe dimension with d > 90 mm.
c n
d
The temperature of cooling for the crack initiation groove shall be appropriate to produce a high speed crack or cracks
emanating from the initiation. For some PA-U compounds a crack initiation groove temperature between 0 °C and −60 °C has
been found to be suitable.
e
The critical pressure, p shall be determined on a pipe produced from the same batch of PA-U compound and the same
c,S4
lot of pipes, as the pipe submitted to the full-scale test.
f
The value of p determined in this test is the reference value, p , to be referred to in the requirement of the S4
c,S4 c,S4,REF
[12]
test specified in ISO 17467-2 .
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ISO 17467-1:2012(E)
Table 2 (continued)
Characteristic Requirements Test parameters Test method
End caps Type A
Orientation Free
Conditioning time 6 h
Water-in-
Type of test
water
Circumferential (hoop)
b)
b) Hydrostatic No failure during the test stress:
ISO 1167-1
strength (pipe) period of any test piece
PA-U 11 160 and PA-U 10,0 MPa ISO 1167-2
12 160
PA-U 11 180 and PA-U
11,5 MPa
12 180
165 h
Test period
80 °C
Test temperature
End caps Type A
Orientation Free
Conditioning time 6 h
Type of test Water-in-
water
c) Hydrostatic Circumferential (hoop)
strength (pipe/ No failure during the test stress: ISO 1167-1
socket fitting period of any test piece ISO 1167-4
PA-U 11 160 and PA-U 10,0 MPa
assembly)
12 160
PA-U 11 180 and PA-U
11,5 MPa
12 180
165 h
Test period
80 °C
Test temperature
a
For test pieces in the form of pipe.
b
For test pieces in the form of injection moulded bar prepared according to ISO 1874-2.
c
The critical pressure, p shall be determined for each new PA-U compound and for every pipe dimension with d > 90 mm.
c n
d
The temperature of cooling for the crack initiation groove shall be appropriate to produce a high speed crack or cracks
emanating from the initiation. For some PA-U compounds a crack initiation groove temperature between 0 °C and −60 °C has
been found to be suitable.
e
The critical pressure, p shall be determined on a pipe produced from the same batch of PA-U compound and the same
c,S4
lot of pipes, as the pipe submitted to the full-scale test.
f
The value of p determined in this test is the reference value, p , to be referred to in the requirement of the S4
c,S4 c,S4,REF
[12]
test specified in ISO 17467-2 .
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ISO 17467-1:2012(E)
Table 2 (continued)
Characteristic Requirements Test parameters Test method
Resistance to
rapid crack
propagation
e
(critical pres- p ≥ 1,5 MOP Test temperature 0 °C ISO 13478
c
sure, p )
c
c
(e ≥ 5 mm)
(Full-scale test)
Resistance to
rapid crack
propagation
f
Test temperature 0 °C ISO 13477
(critical pres-
sure, p )
c,S4
e
(S4 test)
Heating fluid air
Test temperature 150 °C
Longitudinal ≥ 3 % original appearance of
ISO 2505
Length of test piece 200 mm
reversion the pipe shall remain
Duration of exposure Shall conform
time to ISO 2505
Resistance
to slow crack
growth for v ≤ 10 mm/day ISO 13480
e ≥ 5 mm (cone
test)
Test specimens Notched injec-
tion moulded
specimens
2
a ≥ 10 kJ/m ISO 179-1
prepared
cN
Charpy impact
for PA-U 11 and PA-U 12 com- Method
according to
strength
pounds ISO 179-1/1eA
ISO 1874-2
Test temperature
0 °C
a
For test pieces in the form of pipe.
b
For test pieces in the form of injection moulded bar prepared according to ISO 1874-2.
c
The critical pressure, p shall be determined for each new PA-U compound and for every pipe dimension with d > 90 mm.
c n
d
The temperature of cooling for the crack initiation groove shall be appropriate to produce a high speed crack or cracks
emanating from the initiation. For some PA-U compounds a crack initiation groove temperature between 0 °C and −60 °C has
been found to be suitable.
e
The critical pressure, p shall be determined on a pipe produced from the same batch of PA-U compound and the same
c,S4
lot of pipes, as the pipe submitted to the full-scale test.
f
The value of p determined in this test is the reference value, p , to be referred to in the requirement of the S4
c,S4 c,S4,REF
[12]
test specified in ISO 17467-2 .
5.3 Classification and designation
PA-U compounds shall be classified by MRS in accordance with Table 3.
The long-term hydrostatic strength of the compound shall be evaluated in accordance with ISO 9080,
with pressure tests performed in accordance with ISO 1167-1 to find the σ . The MRS-value shall be
LPL
determined from the σ .
LPL
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ISO 17467-1:2012(E)
The classification in accordance with ISO 12162 shall be given and demonstrated by the compound producer.
Where fittings are manufactured from the same compound as pipes, then the compound classification
shall be the same as for pipes.
Table 3 — Classification and designation of compounds
σ (20 °C, 50 years, 0,975) MRS
LPL
Compound designation
MPa MPa
PA-U 11 160
16,00 ≤ σ < 18 16
LPL
PA-U 12 160
PA-U 11 180
18,00 ≤ σ < 20 18
LPL
PA-U 12 180
5.4 Maximum operating pressure MOP
The MOP is the lower value when calculated using Formula (1) and Formula (2):
20×MRS
MOP= (1)
C×−SRD 1
()
The minimum value of the design coefficient, C, for pipes, fittings and valves for the supply of gaseous
fuels shall be 2, or a higher value according to national regulations.
The MRS is determined at 20 °C and for 50 years but other temperatures and times may be used
according to Annex C.
p
c
MOP= (2)
15,
p is the full scale critical pressure determined in accordance with ISO 13478 at 0 °C.
c
The critical pressure determined for pipe with a given wall thickness may be used for pipes made from
the same compound with a smaller wall thickness.
The MRS is determined at 20 °C and for 50 years but other temperatures and times may be used
according to Annex C.
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ISO 17467-1:2012(E)
Annex A
(normative)
Assessment of the degree of pigment or carbon black dispersion in
unplasticized polyamide compounds
A.1 Apparatus
A.1.1 Microscope with a magnification of × (200 ± 10) with a field of view of (1 ± 0,1) mm diameter,
equipped with vernier scale to measure linear dimensions and capable of phase contrast illumination.
A.1.2 Hotplate capable of being maintained at (180 ± 5) °C.
A.1.3 Metal shims of 38 mm length, 19 mm width and 0,03 mm thicknes
...
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