ISO/PWI 27126

DRAFT INTERNATIONAL STANDARD ISO/DIS 27126
ISO/TC 45/SC 1 Secretariat: DSM
Voting begins on: Voting terminates on:
2007-07-27 2007-12-27
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION
Thermoplastic multi-layer (non-vulcanized) hoses and hose
assemblies for the transfer of hydrocarbons, solvents and
chemicals — Specification
Tuyaux et flexibles multicouches (non vulcanisé) thermoplastiques pour le transfert des hydrocarbures, des
solvants et des produits chimiques — Spécifications
ICS 83.140.40

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©
International Organization for Standardization, 2007

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ISO/DIS 27126
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ISO/DIS 27126
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 2
4 Classification. 2
5 Materials and construction . 2
6 Dimensions. 3
7 Performance requirements of hoses and hose assemblies. 4
8 Test frequency. 6
9 Type tests. 6
10 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 for 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/DIS 27126
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 27126 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 1, Hoses (rubber and plastics).
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DRAFT INTERNATIONAL STANDARD ISO/DIS 27126

Thermoplastic multi-layer (non-vulcanized) hoses and hose
assemblies for the transfer of hydrocarbons, solvents and
chemicals — Specification
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
1)
mm to 300 mm, working pressures from 4 bar to 14 bar and working temperatures from –30 °C to 150 °C.
Type 1 hoses are suitable for vapour applications. Types 2 to 4 hoses are suitable for liquid applications.
NOTE The attention of users is drawn to Annex A concerning the selection of the material for the inner wall of layers
and any polymeric coating of the inner helix related to the chemical(s) to be conveyed by the hoses and/or hose
assemblies.
This standard does not apply to hose assemblies for:
aircraft refuelling        (ISO 1825)
fuel dispensing        (ISO 5772)
oil burners         (ISO 6806)
liquefied petroleum gas and liquefied natural gas    (ISO 27127)
fire fighting        (ISO 14775)
refrigeration circuits
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.
EN 590, Automotive fuels - Diesel - Requirements and test methods
EN 10088-1:1995, Stainless steels — Part 1: List of stainless steels
ISO 1043-1, Plastics - Symbols and abbreviated terms - Part 1: Basic polymers and their special
characteristics
ISO 1402, Rubber and plastics hoses and hose assemblies - Hydrostatic testing
ISO 1746, Rubber or plastics hoses and tubing - Bending tests

1)
1 bar = 0,1 MPa

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ISO/DIS 27126
ISO 2411, Rubber- or plastics-coated fabrics - Determination of coating adhesion
ISO 4671, Rubber and plastics hose and hose assemblies - Methods of measurement of dimensions
ISO 4672, Rubber and plastics hoses - Sub-ambient temperature flexibility tests
ISO 7233, Rubber and plastics hoses and hose assemblies - Determination of suction resistance
ISO 8031, Rubber and plastics hoses and hose assemblies - Determination of electrical resistance
ISO 8330:2000, Rubber and plastics hoses and hose assemblies - Vocabulary
ISO 209, Wrought aluminium and aluminium alloys — Chemical composition and forms of products
ISO 1817, Rubber, vulcanized — Determination of the effect of liquids
3 Terms and definitions
For the purposes of this standard, the terms and definitions given in ISO 8330 apply.
WARNING — Persons using this International Standard should be familiar with normal laboratory
practice. This standard 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.
4 Classification
Hoses are 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
Maximum working pressure (bar) 4 10 14 14
Proof pressure (bar) 6 15 21 21
Minimum burst pressure (bar) 16 40 56 56
Vacuum rating (bar) 0,5 0,9 0,9 0,9
Working temperature range (°C) −20 to +60 −30 to +80 −30 to +80 −30 to +150

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 Clause 5.2);
 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; and
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ISO/DIS 27126
 an external wire helix (see Clause 5.2).
5.2 Internal and external wire
Wire shall be chosen in accordance with its chemical resistance from one of the following materials:
2)
 stainless steel conforming to EN 10088-1:1995 numbers 1.4306, 1.4401, 1.4404 or 1.4436 ;
 carbon steel wire conforming to Annex B and either galvanized in accordance with Annex C or sheathed
in a polymeric material of a minimum wall thickness of 0.5mm, resistant to liquid hydrocarbon or liquid
chemicals as agreed between purchaser and manufacturer (see Annex A); and
 aluminium wire conforming to ISO 209.






4

1
2
Key
3
1 Inner wire
2 Film
3 Fabric
4 Outer wire
Figure 1 — Section of a typical thermoplastic multi-layer hose
6 Dimensions
6.1 Internal 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 described in ISO 1746 the values 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.

2) No ISO equivalent available according to the knowledge of Project Leader, but he invites suggestions from ISO/TC
45/SC 1 members as comments to this DIS
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ISO/DIS 27126

Table 2 — Dimensions and minimum bend radii
Dimensions in millimetres
Internal Tolerance Minimum bend radii
diameter
Type 1 Type 2 Type 3 Type 4
25 125 125 200 200
±1
32 150 150 200 200
±1
38 ±1 150 150 200 200
40 150 150 200 200
±1
50 200 200 225 225
±1
65 200 200 225 225
±2
75 ±2 280 280 300 300
80 300 300 350 350
±2
100 400 400 400 400
±2
150 575 575 575 —
±2
200 ±3 800 800 800 —
250 1000 1000 1000 —
±3
300 +3 1200 1200 1200 —

6.2 Tolerance on length
When tested in accordance with ISO 4671 the tolerance on the measured length of delivered hose assemblies
+2
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 no 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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ISO/DIS 27126
Table 3 — Physical properties of hoses
Property Unit Requirements Method(s)
Proof pressure Bar No leakage
...