ISO 16438:2012

INTERNATIONAL ISO
STANDARD 16438
First edition
2012-12-01
Agricultural irrigation equipment —
Thermoplastic collapsible hoses for
irrigation — Specifications and test
methods
Matériel agricole d’irrigation — Tuyaux écrasables en matières
thermoplastiques pour l’irrigation — Spécifications et méthodes d’essai
Reference number
ISO 16438:2012(E)
©
ISO 2012

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ISO 16438:2012(E)

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© ISO 2012
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ii © ISO 2012 – All rights reserved

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ISO 16438:2012(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3  Terms and definitions . 1
4  Classification . 2
5 Material . 2
6 Marking . 2
7 Dimensions . 3
7.1 Inside diameter . 3
7.2 Length . 3
7.3 Spacing of outlet connections . 3
8 Fittings . 3
9  Hydrostatic and hydraulic characteristics . 3
9.1 Proof pressure test . 3
9.2 Deformation under pressure and after relaxation . 3
9.3 Warping . 4
9.4 Head loss . 4
10 Physical characteristics . 4
10.1 Opacity . 4
10.2 UV resistance . 4
Bibliography . 5
© ISO 2012 – All rights reserved iii

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ISO 16438:2012(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 16438 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and
forestry, Subcommittee SC 18, Irrigation and drainage equipment and systems.
iv © ISO 2012 – All rights reserved

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ISO 16438:2012(E)

Introduction
Thermoplastic collapsible hoses have been introduced to agricultural irrigation projects in recent years,
e.g. as headers supplying drip tape systems or as replacement for gated pipes.
Thermoplastic collapsible hoses for irrigation are a special “breed” of hoses. They have a unique
combination of attributes and requirements, that are not covered by any other existing ISO International
Standard, thus justifying the preparation of a separate, dedicated standard. These aspects include:
— equal and accurate spacing of multiple outlet connections;
— very low elongation and amount of twist under pressure;
— resistance to most fertilizers and other chemicals employed in irrigation;
— protection against degradation by UV radiation;
— impermeability to incident light;
— defined pressure loss data.
This International Standard is intended to cover all these aspects by specifying the
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