ISO 27126:2014

INTERNATIONAL ISO
STANDARD 27126
First edition
2014-09-15
Thermoplastic multi-layer (non-
vulcanized) hoses and hose
assemblies for the transfer of
hydrocarbons, solvents and
chemicals — Specification
Tuyaux et flexibles multicouches (non vulcanisés) thermoplastiques
pour le transfert des hydrocarbures, des solvants et des produits
chimiques — Spécifications
Reference number
ISO 27126:2014(E)
©
ISO 2014

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ISO 27126:2014(E)

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© ISO 2014
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ISO 27126:2014(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3  Terms and definitions . 2
4  Classification . 2
5 Materials and construction . 2
5.1 General . 2
5.2 Internal and external wire . 3
6 Dimensions . 3
6.1 Inside diameters, with tolerances and minimum bend radii . 3
6.2 Tolerance on length . 4
7 Performance requirements of hoses and hose assemblies . 4
7.1 Cover . 4
7.2 Hoses . 4
7.3 End fittings . 5
7.4 Hose assemblies . 5
7.5 Electrical continuity . 6
8 Test frequency . 6
9 Type tests . 6
10 Marking . 7
10.1 Hose marking . 7
10.2 Hose assembly marking . 7
Annex A (informative) Resistance to chemical(s) conveyed . 8
Annex B (normative) Carbon steel wire . 9
Annex C (normative) Galvanized zinc coating .11
Annex D (normative) Method of test for crush recovery .12
Annex E (normative) Method of test for fuel resistance .14
Annex F (normative) Method of test for thermal ageing .15
Annex G (normative) Method of test flammability .16
Annex H (normative) Sequence of hydrostatic tests .18
Annex I (normative) Method of test for fitting security.19
Annex J (normative) Method of test for leak tightness .20
Annex K (normative) Type and routine tests for hoses and hose assemblies .21
Annex L (informative) Batch tests for hoses and hose assemblies.22
Bibliography .23
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ISO 27126:2014(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.
ISO 27126 is based on EN 13765:2010 with the following modifications to comply with the requirements
of ISO/TC 45/SC 1:
— the pressure unit “bar” has been replaced by “MPa (bar)”;
— all references to EN or EN/ISO standards have been replaced by references to ISO standards
wherever possible;
— references in Clause 2 have been amended;
— Table 2 has been amended (tolerance for ID 150 only, the other tolerances are already sufficient to
accommodate the required changes of ID to include inch size mandrels);
— Table 3 now requires the change in length and twist to be measured at maximum working pressure
instead of proof pressure and Annex H has been amended accordingly;
— in Table 4, the reference to the test method clause, to determine electrical resistance between
fittings according to ISO 8031 has been corrected;
— Annex G has been amended in order to describe the method of detection of failure after completion
of test;
— in Clause 10, the marking has been amended according ISO/TC45/SC1 remarks.
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INTERNATIONAL STANDARD ISO 27126:2014(E)
Thermoplastic multi-layer (non-vulcanized) hoses and
hose assemblies for the transfer of hydrocarbons, solvents
and chemicals — Specification
WARNING — Persons using this document should be familiar with normal laboratory practice.
This document does not purport to address all the safety problems, if any, associated with its
use. It is the responsibility of the user to establish appropriate health and safety practices and to
ensure compliance with any national regulatory conditions.
1 Scope
This International Standard specifies requirements for four types of thermoplastic multi-layer (non-
vulcanized) hoses and hose assemblies for carrying hydrocarbons, solvents and chemicals. It specifies
bore sizes from 25 mm to 300 mm, working pressures from 0,4 MPa (4 bar) to 1,4 MPa (14 bar) and
working temperatures from –30 °C to 150 °C, according to type.
Type 1 hoses are suitable for vapour applications. Types 2 to 4 hoses are suitable for liquid applications.
NOTE 1 See Annex A concerning the selection of the material for the inner wall of layers and any polymeric
coating of the internal wire helix related to the chemical(s) to be conveyed by the hoses and/or hose assemblies.
NOTE 2 It is intended that the manufacturer be consulted where a polymeric coated internal wire is being
considered for use with low conductivity hydrocarbons or chemicals.
This International Standard does not apply to hoses and hose assemblies for:
— aircraft refuelling see (ISO 1825);
— fuel dispensing see (ISO 5772);
— oil burners see (ISO 6806);
— liquefied petroleum gas and liquefied natural gas see (ISO 27127);
— fire fighting see (ISO 14557);
— offshore liquefied natural gas see (EN 1474–2);
— refrigeration circuits.
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 209, Aluminium and aluminium alloys — Chemical composition
ISO 1043-1, Plastics — Symbols and abbreviated terms — Part 1: Basic polymers and their special
characteristics
ISO 1402:2009, Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
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ISO 27126:2014(E)

ISO 2411, Rubber- or plastics-coated fabrics — Determination of coating adhesion
ISO 4671, Rubber and plastics hoses and hose assemblies — Methods of measurement of the dimensions of
hoses and the lengths of hose assemblies
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 8330, Rubber and plastics hoses and hose assemblies — Vocabulary
ISO 10619-1, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part 1:
Bending tests at ambient temperature
ISO 10619-2, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part 2:
Bending tests at sub-ambient temperatures
ISO 16143-3:2005, Stainless steels for general purposes — Part 3: Wire
EN 590, Automotive fuels — Diesel — Requirements and test methods
EN 10088-3:2005, Stainless steels — Part 3: Technical delivery conditions for semi-finished products, bars,
rods, wire, sections and bright products of corrosion resisting steels for general purposes
3  Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8330 apply.
4  Classification
Hoses shall be classified according to working pressure and working temperature range as given in
Table 1.
Table 1 — Pressure and temperature range
Type 1 Type 2 Type 3 Type 4
MPa Bar MPa Bar MPa Bar MPa Bar
Maximum working pressure 0,4 4 1,0 10 1,4 14 1,4 14
Proof pressure 0,6 6 1,5 15 2,1 21 2,1 21
Minimum burst pressure 1,6 16 4 40 5,6 56 5,6 56
Vacuum rating 0,05 0,5 0,09 0,9 0,09 0,9 0,09 0,9
Working temperature range (°C) −20 to +60 −30 to +80 −30 to + 80 −30 to +150
NOTE 1 bar = 0,1 MPa.
5 Materials and construction
5.1 General
Hoses shall be constructed as shown in Figure 1 and shall consist of the following:
— an internal wire helix (see 5.2);
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ISO 27126:2014(E)

— a multi-ply wall of layers of films and fabrics made of thermoplastics that in combination give the
required properties and provide a complete seal (see also Annex A);
— a cover consisting of a fabric with abrasion resistant polymeric coating;
— an external wire helix (see 5.2).
5.2 Internal and external wire
Wire shall be chosen in accordance with its chemical resistance from one of the following materials:
— austenitic stainless steel wire conforming to EN 10088-3, Table 4, numbers 1.4436 (X3CrNiMo 17-
13-3) or ISO 16143-3:2005, Table 1: X2CrNi 19-11, X5CrNiMo 17-12-2, X2CrNiMo 17-12-2;
— carbon steel wire conforming to Annex B and either galvanised in accordance with Annex C
or sheathed in a polymeric material of a minimum wall thickness of 0,5 mm, resistant to liquid
hydrocarbon or liquid chemicals as agreed between purchaser and manufacturer (see Annex A);
— aluminium wire conforming to ISO 209.

4
1
2
3
Key
1 internal wire
2 film
3 fabric
4 external wire
Figure 1 — Section of a typical thermoplastic multi-layer hose
6 Dimensions
6.1 Inside diameters, with tolerances and minimum bend radii
When measured in accordance with ISO 4671, the values of the internal diameters of the hose shall
conform to Table 2. When tested by the method specified in ISO 10619-1 the value of the minimum bend
radius shall be as given in Table 2. The hose shall show no sign of permanent deformation of the cross
section i.e. kinking.
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ISO 27126:2014(E)

Table 2 — Dimensions and minimum bend radii
Dimensions in millimetres, except where specified as “inch”
Inside diameter Tolerance Minimum bend radii
mm Inch Type 1 Type 2 Type 3 Type 4
25 1 ±1 125 125 200 200
32 1,1/4 ±1 150 150 200 200
38 1,1/2 ±1 150 150 200 200
40 1,1/2 ±1 150 150 200 200
50 2 ±1 200 200 225 225
65 2,1/2 ±2 200 200 225 225
75 3 ±2 280 280 300 300
80 3 ±2 300 300 350 350
100 4 ±2 400 400 400 400
125 5 ±2 500 500 500 —
150 6 ±3 575 575 575 —
200 8 ±3 800 800 800 —
250 10 ±3 1 000 1 000 1 000 —
300 12 ±3 1 200 1 200 1 200 —
6.2 Tolerance on length
When tested in accordance with ISO 4671, the tolerance on the measured length of delivered hose
+2
assemblies shall be % .
−1
7 Performance requirements of hoses and hose assemblies
7.1 Cover
When tested in accordance with ISO 2411, the adhesion between the fabric used for the outer cover and
its abrasion resistant coating shall be not less than 1,5 kN/m.
7.2 Hoses
When tested in accordance with the methods given in Table 3, the physical properties of the hoses shall
conform to Table 3.
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