ISO 15886-3:2021

INTERNATIONAL ISO
STANDARD 15886-3
Third edition
2021-03
Agricultural irrigation equipment —
Sprinklers —
Part 3:
Characterization of distribution and
test methods
Matériel agricole d'irrigation — Asperseurs —
Partie 3: Caractérisation de la distribution et méthodes d'essai
Reference number
©
ISO 2021
© ISO 2021
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ii © ISO 2021 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Collectors . 4
4.1 Collector design . 4
4.2 Collector orientation . 4
5 Installation of sprinklers under test. 5
6 Measurements . 6
6.1 Accuracy of measurements . 6
6.2 Pressure measurement . 6
6.3 Atmospheric conditions measurements . 8
6.4 Corrections for evaporative losses within collectors . 8
7 Collector arrangement, spacing and number . 8
7.1 Full grid collector array method . 8
7.1.1 Method . 8
7.1.2 Collector spacing . 8
7.1.3 Sprinkler location relative to grid . 8
7.2 Radial collector array method . 9
7.2.1 Method . 9
7.2.2 Collector spacing . 9
7.2.3 Location of sprinkler . 9
7.2.4 Radius of throw . 9
8 Additional tests . 9
8.1 Time of rotation . 9
8.2 Trajectory height . 9
9 Test operation . 9
9.1 Rotation of sprinkler riser . 9
9.2 Test duration .10
9.3 Other test details .10
10 Test location specifications .10
10.1 Indoor testing building specifications .10
10.2 Outdoor site specification.11
10.2.1 General.11
10.2.2 Measurement of atmospheric conditions .11
11 Characterization of distribution .11
11.1 Overview .11
11.2 Application pattern coverage and uniformity .11
11.3 Generating performance measurements from radial arrays .12
11.4 Validation of test results .12
12 Radius of throw and water distribution curve .12
12.1 General .12
12.2 Radius of throw .13
12.3 Distribution curve .13
12.4 Uniformity of rotation (for rotating sprinklers intended to rotate in a uniform manner) .14
Annex A (informative) Procedures for the characterization of sprinkler pattern uniformity .15
Annex B (informative) Testing of part-circle sprinklers .19
Bibliography .21
Foreword
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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).
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World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture
and forestry, Subcommittee SC 18, Irrigation and drainage equipment and systems.
This third edition cancels and replaces the second edition (ISO 15886-3:2012), which has been
technically revised. It also incorporates the Amendment ISO 15886-3:2012/Amd 1:2016.
The main changes compared to the previous edition are as follows:
— the definitions have been updated;
— the following test methods have been changed:
— for the installation of sprinkles under test, the height of the top of the sprinkler riser has been
modified;
— for the pressure measurement, the test method for pop-up sprinklers has been modified;
— the radius of throw and water distribution curve tests have been added.
A list of all parts in the ISO 15886 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved

INTERNATIONAL STANDARD ISO 15886-3:2021(E)
Agricultural irrigation equipment — Sprinklers —
Part 3:
Characterization of distribution and test methods
1 Scope
This document specifies the conditions and methods used for testing and characterizing the water
distribution patterns of irrigation sprinklers.
The term sprinkler is used in this document in a broad generic sense and is meant to cover a wide variety
of products. The specific performance measurements addressed include distribution uniformity, wetted
radius, and water jet trajectory height. This document applies to all irrigation sprinkler classifications
for which those three performance measurements are required to verify the design objectives as
defined by the manufacturer.
This document deals both with indoor and outdoor tests and with radial and full grid tests. It is
organized so as to deal with conditions common to all tests first and then with conditions unique to
indoor testing only and finally with conditions unique to outdoor testing only.
For any given sprinkler, a wide range of nozzle configurations, operating conditions, and adjustments
generate at least a theoretical need for a correspondingly large number of tests. Testing agencies and
manufacturers can use interpolation techniques to reduce the number of actual test runs provided
accuracy standards are still being met.
This document does not address the specific performance testing required for sprinklers intended for
use in frost protection.
This document does not address the topic of drop spectrum measurement and
...