ISO 19013-2:2016
(Main)Rubber hoses and tubing for fuel circuits for internal combustion engines — Specification — Part 2: Gasoline fuels
Rubber hoses and tubing for fuel circuits for internal combustion engines — Specification — Part 2: Gasoline fuels
ISO 19013-2:2016 specifies the requirements for rubber tubing and hoses used in gasoline fuel circuits for internal combustion engines. The gasoline fuels covered include those containing oxygenates such as methanol and fuels that have become oxidized ("sour gas"). In addition, this part of ISO 19013 can also be applied as a classification system to enable original equipment manufacturers (OEMs) to detail a "line call-out" of tests for specific applications where these are not covered by the main types specified (see example in Annex G). In this case, the hose or tubing would not carry any marking showing the number of ISO 19013‑2:2016, but may detail the OEM's own identification markings as shown on their part drawings.
Tuyaux de caoutchouc et flexibles pour les circuits de carburant pour les moteurs à combustion interne — Spécifications — Partie 2: Essences
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 19013-2
Second edition
2016-01-15
Rubber hoses and tubing for fuel
circuits for internal combustion
engines — Specification —
Part 2:
Gasoline fuels
Tuyaux de caoutchouc et flexibles pour les circuits de carburant pour
les moteurs à combustion interne — Spécifications —
Partie 2: Essences
Reference number
ISO 19013-2:2016(E)
©
ISO 2016
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ISO 19013-2:2016(E)
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ISO 19013-2:2016(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Classification . 2
4 Sizes . 2
4.1 Tubing . 2
4.2 Hoses . 3
5 Performance requirements for hose and tubing . 4
6 Frequency of testing . 6
7 Marking . 6
Annex A (normative) Cleanliness and extractables test. 7
Annex B (normative) Resistance of tubing to tearing . 9
Annex C (normative) Method for determining the resistance to surface contamination .12
Annex D (normative) Preparation of peroxidized test fuel .13
Annex E (normative) Copper corrosion and crystalline salt formation .17
Annex F (normative) Life-cycle test .18
Annex G (informative) Example of how a non-standard type of hose or tubing could be
specified by an original equipment manufacturer (OEM) using a matrix .19
Annex H (normative) Type tests .20
Annex I (normative) Routine tests .21
Annex J (informative) Production acceptance tests .22
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ISO 19013-2:2016(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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee
SC 1, Rubber and plastics hoses and hose assemblies.
This second edition cancels and replaces the first edition (ISO 19013-2:2005), which has been
technically revised.
ISO 19013 consists of the following parts, under the general title Rubber hoses and tubing for fuel circuits
for internal combustion engines — Specification:
— Part 1: Diesel fuels
— Part 2: Gasoline fuels
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INTERNATIONAL STANDARD ISO 19013-2:2016(E)
Rubber hoses and tubing for fuel circuits for internal
combustion engines — Specification —
Part 2:
Gasoline fuels
WARNING — Persons using this part of ISO 19013 should be familiar with normal laboratory
practice. This part of ISO 19013 does not purport to address all of the safety problems, if any,
associated with its use. It is the responsibility of the user to establish appropriate safety and
health practices and to ensure compliance with any national regulatory conditions.
1 Scope
This part of ISO 19013 specifies the requirements for rubber tubing and hoses used in gasoline
fuel circuits for internal combustion engines. The gasoline fuels covered include those containing
oxygenates such as methanol and fuels that have become oxidized (“sour gas”). In addition, this part
of ISO 19013 can also be applied as a classification system to enable original equipment manufacturers
(OEMs) to detail a “line call-out” of tests for specific applications where these are not covered by the
main types specified (see example in Annex G). In this case, the hose or tubing would not carry any
marking showing the number of this part of ISO 19013, but may detail the OEM’s own identification
markings as shown on their part drawings.
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 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 1629, Rubber and latices — Nomenclature
ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
ISO 3302-1, Rubber — Tolerances for products — Part 1: Dimensional tolerances
ISO 4671, Rubber and plastics hoses and hose assemblies — Methods of measurement of the dimensions of
hoses and the lengths of hose assemblies
ISO 4926, Road vehicles — Hydraulic braking systems — Non-petroleum-base reference fluids
ISO 6133, Rubber and plastics — Analysis of multi-peak traces obtained in determinations of tear strength
and adhesion strength
ISO 7233:2006, Rubber and plastics hoses and hose assemblies — Determination of resistance to vacuum
ISO 7326:2006, Rubber and plastics hoses — Assessment of ozone resistance under static conditions
ISO 8031:2009, Rubber and plastics hoses and hose assemblies — Determination of electrical resistance
and conductivity
ISO 8033, Rubber and plastics hoses — Determination of adhesion between components
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ISO 19013-2:2016(E)
ISO 10619-1, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part 1:
Bending tests at ambient temperature
ISO 10619-2:2011, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness —
Part 2: Bending tests at sub-ambient temperatures
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
ASTM D130, Standard Test Method for Corrosiveness to Copper from Petroleum Products by Copper Strip Test
SAE J1737, Test Procedure to Determine the Hydrocarbon Losses from Fuel Tubes, Hoses, Fittings, and Fuel
Line Assemblies by Recirculation
SAE J2027:1998, Standard for Protective Covers for Gasoline Fuel Line Tubing
SAE J2044:2002, Quick Connect Coupling Specification for Liquid Fuel and Vapor/Emissions Systems
SAE J2260, Nonmetallic Fuel System Tubing with One or More Layers
3 Classification
The product shall consist of extruded rubber materials with or without an integral internal or external
reinforcement which may or may not be pre-formed before final vulcanization. The product may also
have a rubber or thermoplastic barrier layer, either as an internal layer or forming the inner liner, to
impart improved fuel resistance and/or reduced fuel vapour permeability.
Seven hoses and tubings for specific applications are specified as follows.
Type 1 Class A = Pressurized [0,7 MPa (7 bar) working pressure] feed and return lines from the
fuel tank to the engine compartment (−40 °C to +80 °C continuous).
Class B = Pressurized [0,2 MPa (2 bar) working pressure] feed and return lines from the
fuel tank to the engine compartment (−40 °C to +80 °C continuous).
Type 2 Class A = Pressurized [0,7 MPa (7 bar) working pressure] feed and return lines in the
engine compartment (−40 °C to +100 °C continuous).
Class B = Pressurized [0,2 MPa (2 bar) working pressure] feed and return lines in the
engine compartment (−40 °C to +100 °C continuous).
Type 3 Class A = Pressurized [0,7 MPa (7 bar) working pressure] feed and return lines in the
engine compartment (−40 °C to +125 °C continuous).
Class B = Pressurized [0,2 MPa (2 bar) working pressure] feed and return lines in the
engine compartment (−40 °C to +125 °C continuous).
Type 4 Low pressure [0,12 Mpa (1,2 bar) working pressure] fuel filler, vent, and vapour handling
(−40 °C to +80 °C continuous).
All types and classes can also be designated reduced fuel vapour permeable (RP), e.g. Type 1 Class A RP.
4 Sizes
4.1 Tubing
When determined by the methods described in ISO 4671, inside diameters and wall thicknesses shall
be as specified in Table 1.
Tolerances shall be selected from the appropriate categories specified in ISO 3302-1; M3 for moulded
hoses and E2 for extrusions.
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ISO 19013-2:2016(E)
The thickness of the barrier layer, where applicable, shall be included in the total nominal wall thickness
shown in Table 1.
Table 1 — Tubing inside diameters and wall thicknesses
Inside diameter Wall thickness
mm mm
3,5 3,5
4 3,5
5 4
7 4,5
9 4,5
11 4,5
13 4,5
NOTE For information, the unions on which the tubing is to
be fitted have the following diameters: 4 mm, 4,5 mm, 6 mm
or 6,35 mm, 8 mm, 10 mm, 12 mm, and 14 mm.
4.2 Hoses
When determined by the methods described in ISO 4671, the dimensions and concentricity of hoses
shall comply with Tables 2 and 3.
The thickness of the barrier layer, where applicable, shall be included in the total nominal wall thickness
shown in Table 2.
Table 2 — Hose dimensions
Dimensions in millimetres
Inside diameter Tolerance Wall thickness Outside diameter Tolerance
3,5 ±0,3 3 9,5 ±0,4
4 ±0,3 3 10 ±0,4
5 ±0,3 3 11 ±0,4
6 ±0,3 3 12 ±0,4
7 ±0,3 3 13 ±0,4
7,5 ±0,3 3 13,5 ±0,4
8 ±0,3 3 14 ±0,4
9 ±0,3 3 15 ±0,4
11 ±0,3 3,5 18 ±0,4
12 ±0,3 3,5 19 ±0,4
13 ±0,4 3,5 20 ±0,6
16 ±0,4 4 24 ±0,6
21 ±0,4 4 29 ±0,6
+05,
31,5 4,25 40 ±1
−1
+05,
40 5 50 ±1
−1
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ISO 19013-2:2016(E)
Table 3 — Hose concentricity
Inside diameter Maximum variation from
concentricity
mm mm
Up to and including 3,5 0,4
Over 3,5 0,8
5 Performance requirements for hose and tubing
Tests shall be selected from the following list for each application of hose or tubing based on the
performance requirements for the finished product. Type tests (as defined in Clause 6) for each hose or
tubing group are given in Annex H.
a) Burst pressure: When determined in accordance with ISO 1402, the minimum burst pressure for
Types 1, 2, and 3, Class A shall be 3,0 MPa gauge (30 bar) and shall be 1,2 MPa gauge (12 bar) for
Class B. Type 4 shall be 0,5 MPa gauge (5 bar). Additionally, after fuel resistance testing [test m)],
hoses and tubing shall not have a burst pressure of less than 75 % of the original burst pressure.
b) Proof pressure: When determined in accordance with ISO 1402, the test pressure for Types 1, 2,
and 3, Class A shall be 1,5 MPa gauge (15 bar) and shall be 0,6 MPa gauge (6 bar) for Class B. Type 4
shall be 0,25 MPa gauge (2,5 bar). The hose shall not burst or not fail by showing sign of leakage.
c) Adhesion (for all constructions with two or more bonded layers only): When determined by the
appropriate procedure in ISO 8033, the adhesion between each pair of bonded layers shall not be
less than 1,5 kN/m.
d) Low-temperature flexibility: When tested in accordance with ISO 10619-2:2011, method B, a
length of hose or tubing which has been previously kept filled with ISO 1817 liquid C for 72 h ± 2 h
at 21 °C ± 2 °C and then kept cooled at −40 °C ± 2 °C for 72 h ± 2 h shall not exhibit any cracking when
examined under ×2 magnification after bending around a similarly cooled mandrel, the radius of
which is 12 times the nominal size of the hose or 25 times the nominal size of the tubing. The hose
or tubing shall then conform to the burst strength requirement of test a).
e) Internal cleanliness: When determined in accordance with Annex A, the insoluble impurities shall
2 2
not exceed 5 g/m and the fuel-soluble impurities shall not exceed 3 g/m .
f) Extractable waxy materials: When determined in accordance with Annex A, the extractable
2
waxy materials shall not exceed 2,5 g/m .
g) Tear resistance (applicable to tubing only): When determined in accordance to Annex B, the
minimum tear resistance shall be 4,5 kN/m.
h) Ozone resistance: When tested in accordance with ISO 7326:2006, method 1 under the following
conditions, the hose or tubing shall not show cracking when examined under ×2 magnification:
Partial pressure of ozone 50 mPa ± 3 mPa
Duration 72 h ± 2 h
Temperature 40 °C ± 2 °C
Elongation 20 %
i) Heat ageing resistance: After ageing for one or more of the following times and temperatures in
accordance with ISO 188, all constructions shall meet the adhesion requirements of test b), the low-
temperature flexibility requirements of test c), and the ozone resistance requirements of test g).
1) 1 000 h at 80 °C.
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ISO 19013-2:2016(E)
2) 1 000 h at 100 °C.
3) 1 000 h at 125 °C.
4) 168 h at 100 °C.
5) 168 h at 125 °C.
6) 168 h at 140 °C.
NOTE The 1 000 h tests represent long-term working temperatures and the 168 h tests represent short-
term peak working temperatures.
j) Resistance to surface contamination by engine oil: When tested in accordance with Annex C
using ISO 1817 oil 3, all constructions shall meet the adhesion requirements of test b), the cold
flexibility requirements of test c) and the ozone resistance requirements of test g).
k) Resistance to surface contamination by non-petroleum hydraulic (brake/clutch) fluid: When
tested in accordance with Annex C using hydraulic fluid to ISO 4926, all constructions shall meet
the adhesion requirements of test b), the cold flexibility requirements of test c), and the ozone
resistance requirements of test g).
l) Resistance to kinking (this requirement applies only to straight hoses and tubing with a nominal
size of 16 mm or less): When determined in accordance with ISO 10619-1, the maximum coefficient of
deformation (T/D) shall not exceed 0,7. The mandrel diameter shall be 140 mm for hoses and tubing
up to nominal size 11 mm and 220 mm for hoses and tubing of nominal size from 12 mm to 16 mm.
m) Resistance to vacuum (this requirement applies only to straight hoses and tubing): When the hose
or tubing is tested in accordance with ISO 7233:2006, method A at 0,08 MPa absolute (0,8 bar) for
15 s to 60 s duration with a ball of diameter 0,8 × the nominal size, the ball shall traverse the full
length of the hose or tubing.
n) Resistance to fuels: When tested by the methanol fuel resistance test of SAE J2260 for a test
duration of 5 000 h using one or more of the following test fuels at a fuel temperature of 60 °C ± 2 °C,
all constructions shall meet the adhesion requirements of test b), the cold flexibility requirements
of test c), the ozone resistance requirements of test g), the kinking resistance of test k), and the
suction resistance of test l).
1) A mixture of 85 % by volume of liquid C (ISO 1817) and 15 % by volume of methanol.
2) A mixture of 75 % by volume of liquid C (ISO 1817) and 25 % by volume of methanol.
3) A mixture of 50 % by volume of liquid C (ISO 1817) and 50 % by volume of methanol.
4) A mixture of 85 % by volume of methanol and 15 % by volume of liquid C (ISO 1817).
5) 100 % by volume of methanol.
6) A mixture prepared in accordance with Annex D and peroxidized to a peroxide number of 90.
Recheck the peroxide number of the test fuel using the method given in D.5 after each 70 h of
testing. If the peroxide number falls below 80, replace the test fuel with fresh test fuel.
o) Burn-through resistance: When tested in accordance with SAE J2027, the hose or tubing shall
withstand a minimum of 60 s exposure to flame without loss of pressure.
p) Fuel permeability by recirculation (RP hoses and tubing only): When determined in accordance
with SAE J1737, the permeability to a mixture of 75 % by volume of liquid C (ISO 1817) and 25 % by
2
volume of methanol at 60 °C and 13,8 kPa shall not exceed 60 g/m /24 h.
q) Electrical resistance: When determined in accordance with ISO 8031:2009, 4.5 to 4.7, the electrical
resistance shall not exceed 10 MΩ.
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ISO 19013-2:2016(E)
r) Copper corrosion and crystalline salt formation: When tested in accordance with Annex E,
there shall be no tarnish on the copper strip greater than ASTM D130 classification 1. Nor shall
there be any formation of crystalline material on the copper strip, on the inner liner material, or on
the bottom of the test tube.
s) Life-cycle test (types 1, 2, and 3 only): When tested in accordance with Annex F, hose and
...
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