ISO 3949:2004

INTERNATIONAL ISO
STANDARD 3949
Third edition
2004-12-01
Plastics hoses and hose assemblies —
Textile-reinforced types for hydraulic
applications — Specification
Tuyaux et flexibles en plastique — Types hydrauliques avec armature
textile — Spécifications

Reference number
ISO 3949:2004(E)
©
ISO 2004

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ISO 3949:2004(E)
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ISO 3949:2004(E)
Contents Page
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Classification . 2
5 Materials and construction . 2
5.1 Hoses . 2
5.2 Hose assemblies . 2
6 Dimensions and tolerances . 2
6.1 Diameters . 2
6.2 Concentricity . 3
7 Performance requirements . 3
7.1 Hydrostatic requirements . 3
7.2 Change in length . 3
7.3 Minimum bend radius . 3
7.4 Resistance to impulse . 4
7.5 Leakage of hose assemblies . 4
7.6 Cold flexibility . 4
7.7 Ozone resistance . 4
7.8 Electrical conductivity . 4
7.9 Resistance to fluids . 5
8 Frequency of testing . 5
9 Designation . 5
10 Marking . 6
10.1 Hoses . 6
10.2 Hose assemblies . 6
11 Recommendations for packaging and storage . 6
12 Test report . 6
Annex A (normative) Frequency of testing for type approval and routine tests . 7
Annex B (informative) Recommended frequency of testing for production acceptance tests . 8
Annex C (informative) Recommendations for lengths of supplied hoses and hose assemblies . 9
Annex D (normative) Method of test for electrical conductivity . 10
Bibliography . 11
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ISO 3949:2004(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 3949 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee SC 1,
Hoses (rubber and plastics).
This third edition cancels and replaces the second edition (ISO 3949:1991), which has been technically revised.
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INTERNATIONAL STANDARD ISO 3949:2004(E)
Plastics hoses and hose assemblies — Textile-reinforced types
for hydraulic applications — Specification
1Scope
This International Standard specifies requirements for two types of textile-reinforced thermoplastics hoses and
hose assemblies of nominal bore from 5 to 25. Each type is divided into two classes dependent on electrical-
conductivity requirements. They are suitable for use with:
◦
— hydraulic fluids HH, HL, HM, HR and HV (as defined in ISO 6743-4) at temperatures ranging from −40 C
◦
to ;+100 C
— water-based hydraulic fluids HFC, HFAE, HFAS and HFB (as defined in ISO 6743-4) at temperatures
◦ ◦
ranging from 0 C to +60 C.
This International Standard does not include requirements for end fittings. It is limited to the performance of
hoses and hose assemblies.
◦
100 C
NOTE Operating temperatures in excess of may materially reduce the life of the hose.
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 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 1817, Rubber, vulcanized — Determination of the effect of liquids
ISO 4671, Rubber and plastics hoses and hose assemblies — Methods of measurement of dimensions
ISO 4672:1997, Rubber and plastics hoses — Sub-ambient temperature flexibility tests
ISO 6803, Rubber or plastics hoses and hose assemblies — Hydraulic-pressure impulse test without flexing
ISO 7326:1991, Rubber and plastics hoses — Assessment of ozone resistance under static conditions
ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary
ISO 8331, Rubber and plastics hoses and hose assemblies — Guide to selection, storage, use and
maintenance
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8830 apply.
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ISO 3949:2004(E)
4 Classification
Two types of hose are specified, distinguished by their maximum working pressure:
a) type R7: hoses with one or more layers of reinforcement;
b) type R8: hoses with one or more layers of reinforcement, for operation at higher working pressures.
Each type of hose is divided into two classes according to its electrical properties:
1) class 1, no electrical requirements;
2) class 2, “non-conductive” (see 7.8).
5 Materials and construction
5.1 Hoses
Hoses shall consist of a seamless thermoplastics lining resistant to hydraulic fluids, with a suitable textile yarn
reinforcement and a thermoplastics cover resistant to hydraulic fluids, water and the weather.
For class 2 hoses, the cover shall not be perforated. It shall be orange (colour code RAL 2004).
5.2 Hose assemblies
Hose assemblies shall only be manufactured with those hose fittings whose functionality conforms to the
requirements of 7.1, 7.4, 7.5, 7.6 and, for class 2 only, 7.8.
NOTE The manufacturer's instructions should be followed for proper preparation and fabrication of hose assemblies.
6 Dimensions and tolerances
6.1 Diameters
When measured in accordance with ISO 4671, the diameters of hoses shall conform to the values given in
Table 1.
Table 1 — Dimensions of hoses
Maximum outside
Inside diameter
diameter
Nominal
mm mm
bore
Type R7 Type R8 Type R7 Type R8
min. max. min. max.
5 4,6 5,4 4,6 5,4 11,4 14,6
6,3 6,2 7,0 6,2 7,0 13,7 16,8
8 7,7 8,5 7,7 8,5 15,6 18,6
10 9,3 10,3 9,3 10,3 18,4 20,3
12,5 12,3 13,5 12,3 13,5 22,5 24,6
16 15,6 16,7 15,6 16,7 25,8 29,8
19 18,6 19,8 18,6 19,8 28,6 33,0
25 25,0 26,4 25,0 26,4 34,7 38,6
NOTE Inside diameters are in accordance with ISO 4397.
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ISO 3949:2004(E)
6.2 Concentricity
When measured in accordanc
...