EN ISO 8331:2016

SLOVENSKI STANDARD
01-februar-2017
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SIST EN ISO 8331:2014
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Rubber and plastics hoses and hose assemblies - Guidelines for selection, storage, use
and maintenance (ISO 8331:2016)
Tuyaux et flexibles en caoutchouc et en plastique - Lignes directrices pour la sélection, le
stockage, l'utilisation et la maintenance (ISO 8331:2016)
Ta slovenski standard je istoveten z: EN ISO 8331:2016
ICS:
83.140.40 Gumene cevi Hoses
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 8331
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2016
EUROPÄISCHE NORM
ICS 23.040.70 Supersedes EN ISO 8331:2014
English Version
Rubber and plastics hoses and hose assemblies -
Guidelines for selection, storage, use and maintenance (ISO
8331:2016)
Tuyaux et flexibles en caoutchouc et en plastique - Gummi- und Kunststoffschläuche und -
Lignes directrices pour la sélection, le stockage, schlauchleitungen - Richtlinien für die Auswahl,
l'utilisation et la maintenance (ISO 8331:2016) Lagerung, Verwendung und Wartung (ISO 8331:2016)
This European Standard was approved by CEN on 19 October 2016.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8331:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 8331:2016) has been prepared by Technical Committee ISO/TC 45 "Rubber and
rubber products" in collaboration with Technical Committee CEN/TC 218 “Rubber and plastics hoses
and hose assemblies” the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by May 2017, and conflicting national standards shall be
withdrawn at the latest by May 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes EN ISO 8331:2014.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 8331:2016 has been approved by CEN as EN ISO 8331:2016 without any modification.
INTERNATIONAL ISO
STANDARD 8331
Fourth edition
2016-11-01
Rubber and plastics hoses and hose
assemblies — Guidelines for selection,
storage, use and maintenance
Tuyaux et flexibles en caoutchouc et en plastique — Lignes directrices
pour la sélection, le stockage, l’utilisation et la maintenance
Reference number
ISO 8331:2016(E)
©
ISO 2016
ISO 8331:2016(E)
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved

ISO 8331:2016(E)
Contents Page
Foreword .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General recommendations . 1
4.1 Selection criteria. 1
4.2 Storage conditions . 2
4.2.1 General. 2
4.2.2 Storage period . 2
4.2.3 Temperature . 3
4.2.4 Humidity . 3
4.2.5 Light . 3
4.2.6 Ozone . 3
4.2.7 Environment . 3
4.2.8 Sources of heat . . 3
4.2.9 Electric and magnetic fields . 3
4.2.10 Method of storing . 3
4.2.11 Rodents . 3
4.2.12 Issue from storage . 4
4.2.13 Return to storage . 4
4.3 Use and maintenance . 4
4.3.1 Handling . 4
4.3.2 Pressure . 4
4.3.3 Temperature . 4
4.3.4 Products conveyed . 4
4.3.5 Environment . 4
4.3.6 Bending radii . 4
4.3.7 Torsional stress . 4
4.3.8 Tensile stress . 5
4.3.9 Vibration . 5
4.3.10 Assembly of end fittings . 5
4.3.11 Leakage . 5
4.3.12 Electrical properties . 5
4.3.13 Fixed installations . 5
4.3.14 Moving parts . 5
4.3.15 Marking/identification . 5
4.3.16 Maintenance . 6
4.3.17 Repairing of hoses . 6
5 Additional recommendations for specific applications. 6
5.1 General . 6
5.2 Welding and gas-cutting hoses . 6
5.3 Steam hoses . 6
5.4 Hoses for the conveyance of foodstuffs and drinking water. 7
5.5 Hoses for the conveyance of abrasive products . 7
5.6 Hoses for the conveyance of corrosive or aggressive products . 7
5.7 Hoses for the conveyance of flammable products . 7
5.8 Automotive hoses . 8
5.9 Fire-fighting hoses . 8
5.9.1 General. 8
5.9.2 Special points to be observed . 9
5.10 Oil-industry hoses and hose assemblies .10
5.10.1 General.10
5.10.2 Special points to be observed .10
ISO 8331:2016(E)
Bibliography .13
iv © ISO 2016 – All rights reserved

ISO 8331:2016(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 World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee
SC 1, Rubber and plastics hoses and hose assemblies.
This fourth edition cancels and replaces the third edition (ISO 8331:2014), which has been technically
revised with the following change:
— 4.9 has been deleted.
INTERNATIONAL STANDARD ISO 8331:2016(E)
Rubber and plastics hoses and hose assemblies —
Guidelines for selection, storage, use and maintenance
1 Scope
This document sets out recommendations designed to maintain rubber and plastics hoses and hose
assemblies, prior to use, in a condition as close as possible to the condition they were in when they were
received and to obtain the expected service life.
NOTE It is intended that this document be used in conjunction with any applicable national statutory
regulations.
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 2230, Rubber products — Guidelines for storage
ISO 8031, Rubber and plastics hoses and hose assemblies — Determination of electrical resistance and
conductivity
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 http://www.iso.org/obp
4 General recommendations
4.1 Selection criteria
It is in the best interests of the user to select hoses or hose assemblies complying with national or
international standards whenever such standards exist for the intended application. For applications
outside the scope of such standards, needing special requirements or for which the necessary
information is not available, the hose manufacturer or trade association should be consulted.
The following points should be taken into consideration when selecting a hose or hose assembly for a
specific application:
a) Operational environment:
— ambient temperature;
— atmospheric conditions;
— contact with chemically aggressive liquids;
ISO 8331:2016(E)
— contact with other deleterious media.
b) Media conveyed:
— liquid;
— gaseous;
— solids;
— combinations of the above.
c) Method of conveyance:
— pressure (including rate of flow);
— suction (including rate of flow);
— gravity (including rate of flow);
— assisted (mixture of solid/fluid, solid/air).
d) Operating conditions:
— pressure and temperature of product conveyed;
— frequency of use.
e) Installation:
— degree of curvature (minimum bend radius);
— vibration of system;
— risk of damage by impact and abrasion;
— use of correct type of connection;
— type of movement and frequency.
4.2 Storage conditions
4.2.1 General
During storage, especially for long periods, and when hoses and hose assemblies are exposed to certain
adverse influences, the physical properties of hoses and hose assemblies can undergo changes that may
result in them no longer having the optimum characteristics corresponding to their application when
they are put into service. The storage conditions should be such as will offer maximum protection and
minimize deterioration of the articles during storage.
4.2.2 Storage period
The storage period should be kept to a minimum. Rotation of stock is therefore essential and the
“first-in first-out” rule applied. For long-term storage, the following maximum storage periods are
recommended:
— for bulk hoses (without fittings attached), maximum of 4 years;
— for hose assemblies, maximum of 2 years.
These two periods can be interpreted as consecutive for a maximum storage duration of 6 years
(4 years as bulk hose + 2 years as hose assembly).
2 © ISO 2016 – All rights reserved

ISO 8331:2016(E)
4.2.3 Temperature
The storage temperature should be below 25 °C and articles stored away from direct heat sources.
Storage above 25 °C may shorten the life of the hose or hose assembly. Articles should not be subjected
to temperatures over 50 °C or below –30 °C or to abnormal fluctuations in temperature during the
storage period. See ISO 2230 for information on the effect of higher and lower temperatures on the
storage time.
4.2.4 Humidity
The relative humidity should not exceed 70 % or 65 % for polyurethane hose products.
4.2.5 Light
The articles should be stored in a dark place away from sunlight and strong artificial light. If the storage
area has windows or glazed openings, they should be obscured with red, orange or white coverings.
4.2.6 Ozone
Due to the harmful effect of ozone on rubber-based articles, storage areas should not contain equipment
capable of generating ozone, for example mercury vapour lamps or tubes, high-voltage electrical
equipment, electric motors or other equipment likely to cause sparks or electrical discharges.
4.2.7 Environment
Articles should not be placed in contact with certain products or exposed to their vapours, particularly
solvents, oils, greases, acids, disinfectants, etc. Some metals, such as copper, iron and manganese, have
a harmful effect
...