Thermoplastic hoses and hose assemblies -- Wire or synthetic yarn reinforced single-pressure types for hydraulic applications -- Specification

ISO 23297:2017 specifies requirements for eight classes and two types (construction with adhesive bond between layers and construction without adhesive bond between layers) of wire or synthetic yarn reinforced hydraulic hoses and hose assemblies of nominal size from 3,2 to 31,5. Each class has a single maximum working pressure for all sizes. Such hoses 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 for grades A and B and −40 °C to +120 °C for grades C and D. ISO 23297:2017 does not include requirements for end fittings. It is limited to the performance of hoses and hose assemblies. The hose assembly maximum working pressure is governed by the lowest maximum working pressure of the components. NOTE It is the responsibility of the user, in consultation with the hose manufacturer, to establish compatibility of the hose with the fluid to be used.

Tuyaux et flexibles en matière thermoplastique -- Types hydrauliques à pression unique, avec armature de fils métalliques ou synthétiques -- Spécifications

General Information

Status
Published
Publication Date
05-Dec-2017
Current Stage
6060 - International Standard published
Start Date
04-Nov-2017
Completion Date
06-Dec-2017
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INTERNATIONAL ISO
STANDARD 23297
Second edition
2017-11
Thermoplastic hoses and hose
assemblies — Wire or synthetic yarn
reinforced single-pressure types for
hydraulic applications — Specification
Tuyaux et flexibles en matière thermoplastique — Types hydrauliques
à pression unique, avec armature de fils métalliques ou synthétiques
— Spécifications
Reference number
ISO 23297:2017(E)
ISO 2017
---------------------- Page: 1 ----------------------
ISO 23297:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

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ii © ISO 2017 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 23297:2017(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 2

4 Classification ............................................................................................................................................................................................................ 2

4.1 Classes ............................................................................................................................................................................................................ 2

4.2 Types................................................................................................................................................................................................................ 2

4.3 Grades ............................................................................................................................................................................................................. 2

5 Materials and construction ....................................................................................................................................................................... 3

5.1 Hoses ............................................................................................................................................................................................................... 3

5.2 Hose assemblies ..................................................................................................................................................................................... 3

6 Dimensions and tolerances ....................................................................................................................................................................... 3

6.1 Diameters .................................................................................................................................................................................................... 3

6.2 Lengths of supplied hoses and hose assemblies ........................................................................................................ 4

6.3 Outer cover thickness........................................................................................................................................................................ 4

6.4 Concentricity............................................................................................................................................................................................. 4

7 Physical properties ............................................................................................................................................................................................ 5

7.1 Fluid and UV resistance of thermoplastic compounds ......................................................................................... 5

7.1.1 Fluid resistance ................................................................................................................................................................. 5

7.1.2 UV resistance ...................................................................... ................................................................................................. 5

7.2 Performance requirements .......................................................................................................................................................... 5

7.2.1 Hydrostatic requirements ........................................................................................................................................ 5

7.2.2 Change in length ............................................................................................................................................................... 6

7.2.3 Minimum bend radius ................................................................................................................................................. 6

7.2.4 Resistance to impulse .................................................................................................................................................. 6

7.2.5 Leakage of hose assemblies .................................................................................................................................... 7

7.2.6 Cold flexibility .................................................................................................................................................................... 7

7.2.7 Adhesion between components (applicable to type 1 hoses only) ...................................... 7

7.2.8 Vacuum resistance .......................................................................................................................................................... 7

7.2.9 Ozone resistance .............................................................................................................................................................. 8

8 Frequency of testing .......................................................................................................................................................................................... 8

9 Marking .......................................................................................................................................................................................................................... 8

9.1 Hoses ............................................................................................................................................................................................................... 8

9.2 Hose assemblies ..................................................................................................................................................................................... 8

10 Packaging and storage .................................................................................................................................................................................... 9

11 Test report ................................................................................................................................................................................................................... 9

Annex A (normative) Type tests and routine tests .............................................................................................................................10

Annex B (informative) Production acceptance tests .........................................................................................................................11

Annex C (informative) Recommendations for lengths of supplied hoses and hose assemblies ..........12

Bibliography .............................................................................................................................................................................................................................13

© ISO 2017 – All rights reserved iii
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ISO 23297:2017(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 voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following

URL: www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee 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 23297:2008), of which it constitutes a

minor revision. The changes compared to previous edition are as follows:

— the title of the document has been changed to refer to thermoplastic hoses and hose assemblies

instead of thermoplastics hoses and hose assemblies, in keeping with the text of the document;

— the introduction has been amended to explain the current status of a new ISO standard for abrasion

tests on rubber and plastic hose covers;

— Clause 2 has been updated: ISO 1746 and ISO 4672 have been cancelled and replaced by ISO 10619‑1

and 10619‑2, respectively; ISO 7326:2006 has been replaced by ISO 7326:2016;

— 7.2.3 and 7.2.6 have been amended to refer to the bend test standards ISO 10619-1 and ISO 10619-2;

— 7.2.9 has been amended to refer to ISO 7326:2016;

— 9.1 has been revised to stipulate that the hose manufacturer shall use the latest edition of this

document, otherwise the year of publication shall be included in the marking;

— the bibliography has been amended by the deletion of ISO 6945 (standard withdrawn).

iv © ISO 2017 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 23297:2017(E)
Introduction

The abrasion resistance tests for compound and plastic hose covers are not included in this document.

ISO 20444 is intended to specify abrasion tests on rubber and plastic hose covers.

1) Under preparation, to replace ISO 6945 (withdrawn).
© ISO 2017 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 23297:2017(E)
Thermoplastic hoses and hose assemblies — Wire or
synthetic yarn reinforced single-pressure types for
hydraulic applications — Specification
1 Scope

This document specifies requirements for eight classes and two types (construction with adhesive

bond between layers and construction without adhesive bond between layers) of wire or synthetic yarn

reinforced hydraulic hoses and hose assemblies of nominal size from 3,2 to 31,5. Each class has a single

maximum working pressure for all sizes. Such hoses 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 for grades A

and B and −40 °C to +120 °C for grades C and D.

This document does not include requirements for end fittings. It is limited to the performance of

hoses and hose assemblies. The hose assembly maximum working pressure is governed by the lowest

maximum working pressure of the components.

NOTE It is the responsibility of the user, in consultation with the hose manufacturer, to establish

compatibility of the hose with the fluid to be used.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements 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 or thermoplastic — Determination of the effect of liquids

ISO 4671, Rubber and plastics hoses and hose assemblies — Methods of measurement of the dimensions of

hoses and the lengths of hose assemblies
ISO 4892 (all parts), Plastics — Methods of exposure to laboratory light sources

ISO 6803, Rubber or plastics hoses and hose assemblies — Hydraulic-pressure impulse test without flexing

ISO 7233, Rubber and plastics hoses and hose assemblies — Determination of resistance to vacuum

ISO 7326:2016, Rubber and plastics hoses — Assessment of ozone resistance under static conditions

ISO 8033, Rubber and plastics hoses — Determination of adhesion between components

ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary

ISO 8331, Rubber and plastics hoses and hose assemblies — Guidelines for selection, storage, use and

maintenance

ISO 10619-1, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part 1:

Bending tests at ambient temperature

ISO 10619-2:2017, Rubber and plastic hoses and tubing — Measurement of flexibility and stiffness — Part

2: Bending tests at sub-ambient temperatures
© ISO 2017 – All rights reserved 1
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ISO 23297:2017(E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 8330 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Classification
4.1 Classes

Eight classes of hose are specified, distinguished by their maximum working pressure, as shown in

Table 1. Each class may be manufactured in up to 10 nominal sizes.
Table 1 — Classes, nominal size and maximum working pressure
Class 35 70 140 210 280 350 420 560
MWP (bar) 35 70 140 210 280 350 420 560
MWP (MPa) 3,5 7 14 21 28 35 42 56
Nominal size
3,2 X X X X X X X X
5 X X X X X X X X
6,3 X X X X X X X X
8 X X X X X X X X
10 X X X X X X X X
12,5 X X X X X X X X
16 X X X X X X X X
19 X X X X X X X X
25 X X X X X X X X
31,5 X X X X X X X X
X = applicable.
Maximum working pressure.
4.2 Types

Two types are specified according to their construction: type 1 with adhesion between the layers; and

type 2 without adhesion between the layers. In type 1 hoses, the lining and cover are adhesively bonded

(i.e. only separable by force) to the reinforcement; in type 2 hoses, these layers are not attached to the

reinforcement.
4.3 Grades

Hoses are classified according to their resistance to impulse into four grades: A, B, C and D, as shown in

Table 2.
2 © ISO
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