ISO/FDIS 19718

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 19718
ISO/TC 45/SC 1
Rubber and plastics hoses and
Secretariat: DSM
hose assemblies, wire- or textile-
Voting begins on:
2017­07­28 reinforced, for hydraulic power units
used in heavy duty hydraulic tool
Voting terminates on:
2017­09­22
applications — Specification
Tuyaux et flexibles en caoutchouc et en plastique, à armature
textile ou métallique, pour des applications de vérin hydraulique —
Spécifications
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©
NATIONAL REGULATIONS. ISO 2017

© ISO 2017, Published in Switzerland
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ii © ISO 2017 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3  Terms and definitions . 2
4  Classification . 2
5  List of significant hazards . 2
5.1 General . 2
5.2 Hazards due to bursting or leaking of hoses . 2
5.3 Hazards due to failure of connectors . 2
5.4 Hazards due to errors by the operator . 3
5.5 Hazards due to change in length of hose assembly . 4
6 Safety requirements and/or protective measures . 5
6.1 General . 5
6.2 Requirements for compatibility of components . 5
7 Materials and construction . 5
7.1 Hoses . 5
7.2 Hose assemblies . 5
8 Dimensions and tolerances . 5
8.1 Diameters . 5
8.2 Cover thickness . 6
8.3 Concentricity. 6
9 Physical properties . 6
9.1 Fluid resistance . 6
9.1.1 Test pieces . 6
9.1.2 Oil resistance . 6
9.2 Performance requirements . 6
9.2.1 Hydrostatic requirements . 6
9.2.2 Change in length . 7
9.2.3 Minimum bend radius . 7
9.2.4 Resistance to impulse . 8
9.2.5 Leakage of hose assemblies . 8
9.2.6 Cold flexibility . 8
9.2.7 Ozone resistance . 8
9.2.8 Electrical conductivity . 9
9.3 Frequency of testing . 9
10 Type tests . 9
11 Marking . 9
11.1 Hoses . 9
11.2 Hose assemblies .10
12 Test report .10
13 Recommendations for packaging and storage .10
Annex A (normative) Test frequency.11
Annex B (informative) Production tests .12
Annex C (informative) Recommendations for lengths of supplied hoses and hose assemblies .13
Annex D (normative) Test method for electrical conductivity .14
Bibliography .15
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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electrotechnical standardization.
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different types of ISO documents should be noted. This document was drafted in accordance with the
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URL: w w w . i s o .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.
iv © ISO 2017 – All rights reserved

FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 19718:2017(E)
Rubber and plastics hoses and hose assemblies, wire- or
textile- reinforced, for hydraulic power units used in heavy
duty hydraulic tool applications — Specification
1 Scope
This document specifies the requirements for wire- or textile-reinforced hydraulic hose and hose
assemblies used in heavy duty hydraulic tool applications of sizes ranging from 5 to 10. They are suitable
for use with hydraulic fluids HH, HL, HM, HR and HV in accordance with ISO 6743-4 at temperature
ranging from −20 and +55 °C.
This document does not include requirements for the connection ends. It is limited to the performance
of hoses and hose assemblies. The hose assembly maximum working pressure is regulated by the lowest
maximum working pressure of the components.
Typical usage of this product includes, but is not limited to, applications where the hose is in close
proximity to the operator, such as rescue tools and electrical utilities service tools, using hydraulic
power units (electrical, pneumatic, etc.).
NOTE It is the responsibility of the user, in consultation with the hose manufacturer, to establish the
compatibility of the hose with the fluid to be used.
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 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 6743­4, Lubricants, industrial oils and related products (class L) — Classification — Part 4: Family H
(Hydraulic systems)
ISO 6803, Rubber or plastics hoses and hose assemblies — Hydraulic-pressure impulse test without flexing
ISO 7326:2016, 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 — Guidelines for selection, storage, use and
maintenance
ISO 10619­1, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part 1:
Bending tests at ambient temperature
ISO 10619­2:2011, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness —
Part 2: Bending tests at sub-ambient temperatures
ISO 12100, Safety of machinery — General principles for design — Risk assessment and risk reduction
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:
— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4  Classification
All hoses are classified on their electrical properties using grades:
a) Grade 1, no electrical requirements.
b) Grade
...