This document specifies the design and operational requirements of irrigation sprinklers and their test methods. The term sprinkler is used in this document in a broad generic sense and it means to cover a wide variety of products as classified by ISO 15886‑1. This document applies to rotating sprinklers. This document is applicable to sprinklers intended for installation on a pipe lateral and for operation with irrigation water.

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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.

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This document specifies the characteristics of pipes (mains, sub-mains and laterals) made from polyethylene (PE), intended for the conveyance of water for irrigation, at a water temperature up to 45 °C. NOTE 1 For the effect of water temperature on the maximum operating pressure, see Annex A. This document applies to pipes that will not be subjected to internal pressure for long periods, and not more than 1 500 hours/year. For piping applications with long-term continuous pressure, the ISO 4427 series applies. NOTE 2 The expected lifetime of pipes covered by this document is ten years or less. This document also specifies the properties of the material and the parameters for the test methods to which it refers.

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This document specifies the conditions and methods for testing the durability of rotating sprinklers for irrigation. The term sprinkler is used here in a broad generic sense and is meant to cover a wide variety of products as classified in ISO 15886-1, which applies to all irrigation sprinkler classifications having both static parts and moving parts during operation, as defined by the manufacturer. For any given sprinkler, a wide range of nozzle configurations, operating conditions, and adjustments generates 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.

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This document provides guidelines to planners and practitioners on how to adjust irrigation equipment so as to allow direct utilization of treated wastewater (TWW) for irrigation. It deals with the adjustment of all components of irrigation systems to TWW quality in respect to physical, chemical and biological parameters. This document provides guidelines on how to protect irrigation equipment so as to guarantee water systems functionality at high levels of efficiency. This document includes recommendations for a) pumping stations, b) filtration, c) water network systems, d) irrigation equipment: emitters (drippers, sprinklers, mini sprinklers, micro sprinklers, sprayers and irrigation machine (sprinklers and sprayers), e) physical treatment of irrigation equipment, and f) chemical treatment of irrigation equipment. This document defines TWW parameters at the irrigation system inlet after a wastewater treatment plant, in order to allow optimal and continual functioning of the irrigation systems and to allow uniformity of emitters' discharge.

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This document gives guidelines for the design, selection, installation and use of the equipment required to establish basic test facilities for irrigation equipment evaluation. It provides the information sufficient to complement the detailed procedures included in ISO 7714, ISO 8026, ISO 9261, ISO 9635 (all parts), ISO 9644, ISO 9911, ISO 10522, ISO 15886 and ISO 16399 for the testing of agricultural irrigation system components, specifically emitters, sprinklers, valves, sprayers and water meters.

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This document applies to manually-activated valves only. This document specifies a test method for determining the pressure loss in agricultural irrigation valves under steady-state conditions when water flows through them. The scope and accuracy of the valve performance specifications presented will assist agricultural irrigation system designers in comparing pressure losses through various types of valves. The measurement of pressure losses provides a means for determining the relationship between pressure loss and flow rate through the valve. This document also describes the method of reporting pertinent test data. No attempt is made to define product use, design or applications. The test method is suitable for valves with equal inlet and outlet nominal sizes.

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This document specifies construction requirements and test methods for pressurized granulated media filters, hereinafter referred to as media filters, intended for operation in agricultural irrigation systems. It is applicable to both manual cleaning media filters and automatic self-cleaning media filters, used as single unit or in batteries (two or more units working in parallel). This document covers the operation and performance of a media filter, together with all related valves, back flushing mechanism, underdrains, manifolds and other related accessories necessary for the operation of the filter. This document is applicable to three configurations of a filter. a) An empty filter vessel (tank) housing. b) A filter vessel filled with media filter material(s), complete with valves, connections, air release and/or other accessories. This configuration, when connected to and controlled by a flushing control device, is a complete operating single filter unit, usually positioned as a part of a filtration station. c) A filtration station, called "filter battery". Annex A provides information on types of irrigation media filters. Annex B provides information on granulated media.

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This document specifies general requirements and test methods for volumetric valves able to automatically deliver preset quantities of water. It is applicable to valves actuated by pipeline pressure and flow alone, and which do not need any other, external, source of energy. NOTE Volumetric valves are typically required to operate correctly with different qualities of irrigation water at a variety of flow rates and at temperatures between 5 °C and 50 °C.

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ISO 13693-1:2013 specifies the general requirements and test methods for small plastics-bodied valves used for chemigation, intended for operation in irrigation pipe systems which may contain fertilizers and chemicals of the type and concentration used in agriculture.
It is applicable to controllable safety devices (also known as backflow preventers) with a reduced pressure zone (RPZ), intended to prevent backflow by back-siphonage or backpressure of irrigation water into an upstream potable water distribution system, whenever the pressure in the latter is lower than that in the system located downstream.
It is applicable to such devices of nominal size up to and including DN 50 (2"), with a nominal pressure of PN10, that are capable of working without modification or adjustment at any pressure up to 1 MPa (10 bar), with any pressure variation up to 1 MPa (10 bar), and in permanent duty at temperatures up to 45 °C and for 1 h at 65 °C.

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ISO 13693-1:2013 specifies the general requirements and test methods for small plastics-bodied valves used for chemigation, intended for operation in irrigation pipe systems which may contain fertilizers and chemicals of the type and concentration used in agriculture.
It is applicable to controllable safety devices (also known as backflow preventers) with a reduced pressure zone (RPZ), intended to prevent backflow by back-siphonage or backpressure of irrigation water into an upstream potable water distribution system, whenever the pressure in the latter is lower than that in the system located downstream.
It is applicable to such devices of nominal size up to and including DN 50 (2"), with a nominal pressure of PN10, that are capable of working without modification or adjustment at any pressure up to 1 MPa (10 bar), with any pressure variation up to 1 MPa (10 bar), and in permanent duty at temperatures up to 45 °C and for 1 h at 65 °C.

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IWA 20:2017 reviews drip irrigation in comparison to major irrigation methods available and practiced today by farmers worldwide. IWA 20:2017 reviews the benefits of drip irrigation, such as increased yield, reduced water consumption, reduced energy consumption, lower environmental impact, reduced contamination of groundwater and surface water, reduced greenhouse gas emissions and reduced labour. IWA 20:2017 also reviews some of the limitations of drip irrigation. IWA 20:2017 does not provide a technical specification for the implementation of drip irrigation. The qualities of drip irrigation referred to in IWA 20:2017 apply to systems manufactured in accordance with ISO 9261 or equivalent standard. IWA 20:2017 is intended to be used by agricultural policymakers, infrastructure providers, water supply regulatory bodies and authorities, and food chain and farmer cooperatives interested in developing agricultural policies to preserve natural resources and funds. IWA 20:2017 is also intended to be used by farmers and smallholders interested in applying an economic agricultural method.

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ISO 13460-1:2015 specifies the required properties and test methods for plastics saddles for assembly on polyethylene (hereinafter "PE") pressure pipes used in above-ground and underground irrigation systems conveying water at temperatures not exceeding 50 °C.

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ISO 18471:2015 a test method for the verification of filtration grade of filters intended for operation in agricultural irrigation systems. It is intended to be used for verifying the filter manufacturer's declaration about the filtration grade of a specific filter. This test method uses a Clogging Capacity Meter (CCM) device to compare the filtration grade of the filter under test against the filtration grade of a test filtration screen. NOTE This test method may also be used by a filter manufacturer to determine the filtration grade.

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This International Standard specifies the general requirements and test methods for irrigation sprayers.
It is applicable to sprayers intended for installation on a pipe lateral and for operation with irrigation water.

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This International Standard specifies a test method for determining the pressure loss in agricultural irrigation
valves under steady-state conditions when water flows through them. The scope and accuracy of the valve
performance specifications presented will assist agricultural irrigation system designers in comparing pressure
losses through various types of valves.
The measurement of pressure losses provides a means for determining the relationship between pressure
loss and flow rate through the valve.
This International Standard also describes the method of reporting pertinent test data.
No attempt is made to define product use, design or applications.
The test method is suitable for valves with equal inlet and outlet nominal sizes.
NOTE Unless otherwise specified, the equations are expressed in the SI units recommended by ISO 1000.

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ISO 13693-2:2015 specifies the construction and performance requirement and test methods for metal-bodied chemigation valves with water at temperatures not exceeding 50 °C, which might contain fertilizers and chemicals of the types and concentration used in agriculture. The valve is designed to prohibit backflow caused by either back pressure or back siphonage. It is not designed for use in potable water systems. It is not to be confused with other forms of backflow prevention devices including pressure vacuum breakers, double check valves, reduced pressure zone valves, or goose neck loops. ISO 13693-2:2015 specifies the minimum design, construction, and performance testing requirements for the chemigation valve assembly. The assembly consists of the following components: ? a valve body into which a spring-loaded check valve is mounted with a resilient disk cover on the sealing surface; a combination air release/vacuum relief valve located upstream of the check valve; a low pressure drain valve located upstream of the check valve; an inspection port located so as to permit visual and manual inspection of the valve working components.

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ISO 9635-5:2014 specifies construction and performance requirements and test methods for control valves, intended for operation in irrigation systems with water at temperatures not exceeding 60 °C, which can contain fertilizers and other chemicals of the types and concentrations used in agriculture. It is applicable to hydraulically-operated control irrigation valves of DN 15 (1/2 inch) diameter or greater, designed to operate in any position, from fully open to fully closed. The valves can either be directly operated (i.e. the force applied via a spring or diaphragm to the obturator), or pilot-operated (i.e. the force is applied through an adjustable pilot valve via a diaphragm). These valves can also function as check valves.

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ISO 9635-3:2014 specifies construction and performance requirements and test methods for check valves, intended for operation in irrigation systems with water at temperatures not exceeding 60 °C, which can contain fertilizers and other chemicals of the types and concentrations used in agriculture. It is applicable to hydraulically operated check irrigation valves of DN 15 diameter or greater, designed to operate in the fully open and fully closed positions, but which can also operate for extended time periods in any intermediate position.

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ISO 9635-2:2014 specifies construction and performance requirements and test methods for isolating valves, intended for operation in irrigation systems with water at temperatures not exceeding 60 °C, which can contain fertilizers and other chemicals of the types and concentrations used in agriculture. It is applicable to isolating irrigation valves of DN 8 in diameter or greater, designed to operate in the fully open and fully closed positions, but which can also operate for extended time periods in any intermediate position.

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ISO 9635-4:2014 specifies construction and performance requirements and test methods for air valves, intended for operation in irrigation systems with water at temperatures not exceeding 60 °C, which can contain fertilizers and other chemicals of the types and concentrations used in agriculture. It is applicable to hydraulically operated air irrigation valves of DN 15 diameter or greater, designed to be directly operated, i.e. the force is applied to the obturator by the float, either directly or via a mechanical linkage. The valves can be operated by a force applied through an adjustable pilot valve.

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ISO 9635-1:2014 specifies construction and performance requirements and test methods for valves, intended for operation in irrigation systems with water at temperatures not exceeding 60 °C, which can contain fertilizers and other chemicals of the types and concentrations used in agriculture. It is applicable to irrigation valves of 8 mm diameter or greater, designed to operate in the fully open and fully closed positions, but which can also operate for extended time periods in any intermediate position.

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ISO 16399:2014 applies to water meters intended for irrigation use (herein after referred to as water meters), regardless of the water quality used for this purpose, and specifies the requirements and certification procedures for water meters, irrespective of the design technologies used to meter the actual volume of cold water or heated water flowing through a fully charged closed conduit. These water meters incorporate devices which indicate the integrated volume. ISO 16399:2014 also applies to water meters based on electrical or electronic principles and to water meters based on mechanical principles, incorporating electronic devices used to meter the actual volume flow of cold water. It provides metrological requirements for electronic ancillary devices when they are subject to metrological control. As a rule, the ancillary devices are optional. However national or international regulations make some ancillary devices mandatory in relation to the utilization of the water meter.

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This part of ISO 8224 specifies the operational characteristics of, and laboratory and field test methods for, traveller irrigation machines. It includes
- user-oriented technical information for inclusion in the manufacturer’s accompanying product literature,
- laboratory test procedures for evaluating the uniformity of water application on an irrigated strip by a machine operating within a specified range of conditions and for determining the maximum travelling rates the drive mechanism is able to achieve in response to specified operating conditions, and
- field test procedures for determining the uniformity of water application on a given irrigated strip under local conditions prevailing in the field at time of testing. It is applicable only to traveller irrigation machines and not to other types of irrigation machine such as centrepivot and moving lateral irrigation machines.

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ISO 9912-2:2013 specifies general construction requirements and test methods for strainer filters and disc filters intended for operation in agricultural irrigation systems. It does not cover the aspects of filtration ability, efficiency and capacity (like quality of filtered water or time of operation before a filter becomes entirely clogged), nor does it deal with structural requirements or tests of automatic flushing mechanism filters that are covered by ISO 9912-3.

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ISO 9912-3:2013 specifies general construction requirements and test methods for automatic flushing strainer-type filters and disc filters intended for operation in agricultural irrigation systems. It does not cover the aspects of filtration ability, efficiency and capacity (like quality of filtered water or time of operation before filter becomes entirely clogged).

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ISO 13693-1:2013 specifies the general requirements and test methods for small plastics-bodied valves used for chemigation, intended for operation in irrigation pipe systems which may contain fertilizers and chemicals of the type and concentration used in agriculture. It is applicable to controllable safety devices (also known as backflow preventers) with a reduced pressure zone (RPZ), intended to prevent backflow by back-siphonage or backpressure of irrigation water into an upstream potable water distribution system, whenever the pressure in the latter is lower than that in the system located downstream. It is applicable to such devices of nominal size up to and including DN 50 (2"), with a nominal pressure of PN10, that are capable of working without modification or adjustment at any pressure up to 1 MPa (10 bar), with any pressure variation up to 1 MPa (10 bar), and in permanent duty at temperatures up to 45 °C and for 1 h at 65 °C.

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ISO 16438:2012 specifies requirements and test methods for reinforced and non-reinforced thermoplastic collapsible hoses, which are intended to be used as main and sub-main supply lines for the conveyance and distribution of water for irrigation at water temperatures up to 50 °C. It is applicable to irrigation hoses with nominal diameters between 40 mm and 500 mm and working pressures between 0,3 bar (0,03 MPa) and 6 bar (0,6 MPa). ISO 16438:2012 is applicable to two types of hose configurations: distributor hose (with outlet connections) and plain hose (without outlet connections).

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ISO/TR 15155-2:2012 is intended to provide guidance on the operation of basic test facilities for irrigation equipment evaluation. Its purpose is to provide information sufficient to implement the detailed procedures included in ISO 7714, ISO 8026, ISO 9261, ISO 9635-1 to 5, ISO 9644, ISO 9911 and ISO 10522 and ISO 15886-3 for the testing of agricultural irrigation system components, specifically emitters, sprinklers and valves. The intent is that the structure of tISO/TR 15155-2 can be modified to be used as the operating manual of a test facility established to test the components referred to in these International Standards.

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ISO 15886-3:2012 specifies the conditions and methods used for testing and characterizing the water distribution patterns of irrigation sprinklers. The term sprinkler is used in a broad generic sense and is meant to cover a wide variety of products as classified by ISO 15886-1. The specific performance measurements addressed include distribution uniformity, wetted radius, and water jet trajectory height. This standard applies to all irrigation sprinkler classifications for which these three performance measurements are required to verify the design objectives as defined by the manufacturer. ISO 15886-3:2012 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 may use interpolation techniques to reduce the number of actual test runs provided accuracy standards are still being met. ISO 15886-3:2012 does not address the specific performance testing required for sprinklers intended for use in frost protection. It also 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. To apply ISO 15886-3:2012 for evaluating irrigation coverage, all sprinklers must be identical and arranged in a fixed repeating geometric pattern. ISO 15886-3:2012 does not apply to moving systems. ISO 15886-3:2012 applies to part-circle sprinklers provided that the testing agency can satisfy questions of potential anomalies in performance parameters. One annex addresses the procedures for the characterization of sprinkler pattern uniformity; another addresses testing part-circle sprinklers.

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ISO 15886-1:2012 defines terms related to irrigation sprinklers and specifies the classification of sprinklers according to the following categories: physical factors; characteristics of the water spray; the mechanism for operation and water distribution; the mechanism for sealing; the intended use; additional functions incorporated into the sprinkler. The scope is intentionally broad to cover the widest possible range of sprinkler construction, performance, and intended-use alternatives.

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ISO 15081:2011 establishes graphical symbols for use on drawings and diagrams relating to the installation of pressurized agricultural irrigation systems.

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ISO 9261:2004 gives mechanical and functional requirements for agricultural irrigation emitters and emitting pipes, and, where applicable, their fittings, and provides methods for testing conformity with such requirements. It also specifies the data to be supplied by the manufacturer to permit correct information, installation and operation in the field. It is applicable to emitters, emitting and dripping (trickling) pipes, hoses, including collapsible hoses ("tapes") and tubing of which the emitting units form an integral part, to emitters and emitting units with or without pressure regulation and with flow rates not exceeding 24 l/h per outlet (except during flushing), as well as to fittings dedicated to the connection of emitting pipes, hoses and tubing. It is not applicable to porous pipe (pipe that is porous along its entire length), nor does it cover the performance of pipes as regards clogging.

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This International Standard specifies an in-field method for determining the uniformity of water distribution in the field from centre-pivot and moving lateral irrigation machines equipped with sprayer or sprinkler nozzles. The calculation of the coefficient of uniformity is also specified. This International Standard is applicable to agricultural irrigation machines for which the water application device is more than 1,5 m above the soil surface and for which the water distribution from successive devices overlaps. It is not applicable to the evaluation of centre-pivot irrigation machines equipped with various corner arm application devices.

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This European standard specifies the test methods in the laboratory and in the field.

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ISO 9261:2004 gives mechanical and functional requirements for agricultural irrigation emitters and emitting pipes, and, where applicable, their fittings, and provides methods for testing conformity with such requirements. It also specifies the data to be supplied by the manufacturer to permit correct information, installation and operation in the field. It is applicable to emitters, emitting and dripping (trickling) pipes, hoses, including collapsible hoses ("tapes") and tubing of which the emitting units form an integral part, to emitters and emitting units with or without pressure regulation and with flow rates not exceeding 24 l/h per outlet (except during flushing), as well as to fittings dedicated to the connection of emitting pipes, hoses and tubing. It is not applicable to porous pipe (pipe that is porous along its entire length), nor does it cover the performance of pipes as regards clogging.

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ISO 8026:2009 specifies the general requirements and test methods for irrigation sprayers. It is applicable to sprayers intended for installation on a pipe lateral and for operation with irrigation water.

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ISO 11545:2009 specifies an in-field method for determining the uniformity of water distribution in the field from centre-pivot and moving lateral irrigation machines equipped with sprayer or sprinkler nozzles. The calculation of the coefficient of uniformity is also specified.
It is applicable to agricultural irrigation machines for which the water application device is more than 1,5 m above the soil surface and for which the water distribution from successive devices overlaps. It is not applicable to the evaluation of centre-pivot irrigation machines equipped with various corner arm application devices.

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ISO 11545:2009 specifies an in-field method for determining the uniformity of water distribution in the field from centre-pivot and moving lateral irrigation machines equipped with sprayer or sprinkler nozzles. The calculation of the coefficient of uniformity is also specified. It is applicable to agricultural irrigation machines for which the water application device is more than 1,5 m above the soil surface and for which the water distribution from successive devices overlaps. It is not applicable to the evaluation of centre-pivot irrigation machines equipped with various corner arm application devices.

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This standard specifies specific safety requirements and their verification for the design and construction of centre pivot and moving lateral types irrigation machines that are electrically powered.
NOTE   Figures 1 to 5 give illustrations of these machines.
In addition, it specifies the type of information on safe working practices to be provided by the manufacturer.
The list of significant hazards dealt with in this standard is given in annex A. Annex A also indicates the hazards which have not been dealt with.
Hazards due to the use of the pump associated with centre pivot and moving lateral types irrigation machines are not dealt with.
Hazards induced by the use of these machines for pesticide products and liquid fertilizer application are not dealt with.
Environmental aspects have not been considered in this standard.
This standard applies primarily to machines which are manufactured after the date of issue of the standard.

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This standard specifies safety requirements and their verification for the design and construction of reel machines for irrigation including self-propelled machines.
It describes methods for elimination or reduction of risks which need specific requirements for reel machines for irrigation.
In addition, it specifies the type of information on safe working practices to be provided by the manufacturer.
The list of significant hazards dealt with in this standard is given in annex A. Annex A also indicates the hazards which have not been dealt with.
Environmental aspects have not been considered in this standard.
This standard applies primarily to machines which are manufactured after the date of issue of the standard.

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This standard specifies safety requirements and their verification for the design and construction of reel machines for irrigation including self-propelled machines.
It describes methods for elimination or reduction of risks which need specific requirements for reel machines for irrigation.
In addition, it specifies the type of information on safe working practices to be provided by the manufacturer.
The list of significant hazards dealt with in this standard is given in annex A. Annex A also indicates the hazards which have not been dealt with.
Environmental aspects have not been considered in this standard.
This standard applies primarily to machines which are manufactured after the date of issue of the standard.

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This standard specifies specific safety requirements and their verification for the design and construction of centre pivot and moving lateral types irrigation machines that are electrically powered.
NOTE   Figures 1 to 5 give illustrations of these machines.
In addition, it specifies the type of information on safe working practices to be provided by the manufacturer.
The list of significant hazards dealt with in this standard is given in annex A. Annex A also indicates the hazards which have not been dealt with.
Hazards due to the use of the pump associated with centre pivot and moving lateral types irrigation machines are not dealt with.
Hazards induced by the use of these machines for pesticide products and liquid fertilizer application are not dealt with.
Environmental aspects have not been considered in this standard.
This standard applies primarily to machines which are manufactured after the date of issue of the standard.

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This document applies to irrigation hydrants intended to supply equipment for use in water distribution irrigation networks. The range of PN is that defined in EN 1074-1, i.e.: PN 10, PN 16, PN 25 and limited to PN 25.

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This document applies to irrigation hydrants intended to supply equipment for use in water distribution irrigation networks. The range of PN is that defined in EN 1074-1, i.e.: PN 10, PN 16, PN 25 and limited to PN 25.

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ISO 13457:2008 specifies the construction, operational requirements and test methods for water‑driven chemical injector pumps, used to inject chemicals into irrigation systems. The chemicals include liquid fertilizers and solutions of fertilizers and other soluble agricultural chemicals such as acids and pesticides. ISO 13457:2008 is applicable to those pumps intended to operate at water temperatures of up to 50 °C and with the types and concentrations of chemicals routinely applied in irrigation. It does not cover the function of backflow prevention devices, nor is it applicable to water-driven devices for injecting chemicals into an irrigation system operating on the basis of the Venturi principle.

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This part of EN 15099 establishes the definitions, functionalities and specifications related to remote monitoring and control for irrigation systems and its elements.

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TC - Modification to 6.1.1

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