ISO 15886-3:2021 Agricultural irrigation equipment — Sprinklers —Part 3: Characterization of distribution and test methods

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Agricultural irrigation equipment — Sprinklers —Part 3: Characterization of distribution and test methods是国际标准化组织(International Organization for Standardization，简称ISO)于2021-03发布的ISO标准，适用于全球。

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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 characterization and the related questions of soil compaction, spray drift, evaporative losses, etc., all of which can be considerations in the design of sprinkler irrigation systems.

This document is used for evaluating irrigation coverage of sprinklers that are identical and arranged in a fixed repeating geometric pattern. This document does not apply to moving systems.

This document applies to part-circle sprinklers provided that the testing agency can satisfy questions of potential anomalies in performance parameters.

NOTE Annex A addresses the procedures for the characterization of sprinkler pattern uniformity. Annex B addresses testing part-circle sprinklers.

2 Normative references

There are no normative references in this document.

3 Terms a nd definiti ons

For the purposes of this document, the following terms and definitions apply.

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

— ISO Online browsing platform: available at https:// www .iso .org/ obp

— IEC Electropedia: available at http:// www .electropedia .org/

3.1

ambient temperature

temperature of the air surrounding a sprinkler

3.2

area of coverage

area within the wetted boundary from the sprinkler operated within the range of effective application rates (3.9) specified in the manufacturer’s literature

3.3

C h r i s t i a n s en's u n i f or m it y c o ef f ic ient

UCC

coefficient using deviations from the mean to characterize the uniformity of field-measured or simulated water application from a grid of sprinklers

3.4

clean water

water processed, if necessary, so as to contain suspended particles no larger than 74 μm (200-mesh equivalent) and to contain no dissolved chemicals known to have short-term effects on sprinklers materials

3.5

collector

receptacle into which water is deposited during a water distribution test

3.6

critical dry area

experience-based definition of the dry area size that defines uniformity of coverage objectives

3.7

densogram

areal map utilizing the density of dots representing water application depth at locations in the area of coverage (3.2) of a sprinkler or a grid of sprinklers

3.8

distribution uniformity

DU

coefficient using the lowest 25 % of water application depths to characterize the uniformity of field-

measured or simulated water application from a grid of sprinklers

3.9

effective application rate

application rate equal to or exceeding 0,26 mm/h for sprinklers with flow rates (3.11) exceeding 120 l/h and 0,13 mm/h for sprinklers with flow rates equal to or less than 120 l/h

3.10

effective radius of throw

radius at which 95 % of the reconstituted volume of water discharged by a sprinkler, interpolated between points of measurement, is applied

3.11

f low r at e

volume of water flowing through a device per unit time

3.12

full grid collector array

collectors (3.5) located at the intersections of a two-dimensional geometric grid pattern sufficient in number to give a desired statistical basis for determining water distribution uniformity (3.8)

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