EN ISO 8224-1:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Prevozni namakalni stroji - 1. del: Obratovalne lastnosti in metode laboratorijskih in terenskih preskusov (ISO 8224-1:2003)Mobile Beregnungsmaschinen - Teil 1: Betriebskennwerte, Prüfverfahren für Labor- und Felduntersuchungen (ISO 8224-1:2003)Machines d'arrosage mobiles - Partie 1: Caractéristiques opérationnelles et méthodes d'essai en laboratoire et au champ (ISO 8224-1:2003)Traveller irrigation machines - Part 1: Operational characteristics and laboratory and field test methods (ISO 8224-1:2003)65.060.35Namakalna in drenažna opremaIrrigation and drainage equipmentICS:Ta slovenski standard je istoveten z:EN ISO 8224-1:2003SIST EN ISO 8224-1:2004en01-januar-2004SIST EN ISO 8224-1:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN ISO 8224-1February 2003ICS 65.060.35English versionTraveller irrigation machines - Part 1: Operational characteristicsand laboratory and field test methods (ISO 8224-1:2003)Machines d'arrosage mobiles - Partie 1: Caractéristiquesopérationnelles et méthodes d'essai en laboratoire et auchamp (ISO 8224-1:2003)Mobile Beregnungsmaschinen - Teil 1: Betriebskennwerte,Prüfverfahren für Labor- und Felduntersuchungen (ISO8224-1:2003)This European Standard was approved by CEN on 18 December 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN ISO 8224-1:2003 ESIST EN ISO 8224-1:2004

2003-03-19ForewordThis document (EN ISO 8224-1:2003) has been prepared by Technical Committee ISO/TC 23"Tractors and machinery for agriculture and forestry" in collaboration with Technical CommitteeCEN/TC 334 "Irrigation techniques", the secretariat of which is held by AFNOR.This European Standard shall be given the status of a national standard, either by publication of anidentical text or by endorsement, at the latest by August 2003, and conflicting national standards shallbe withdrawn at the latest by August 2003.According to the CEN/CENELEC Internal Regulations, the national standards organizations of thefollowing countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg,Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom.Endorsement noticeThe text of ISO 8224-1:2003 has been approved by CEN as EN ISO 8224-1:2003 without anymodifications.NOTE
Normative references to International Standards are listed in Annex ZA (normative).SIST EN ISO 8224-1:2004

Reference numberISO 8224-1:2003(E)© ISO 2003
INTERNATIONAL STANDARD ISO8224-1Second edition2003-02-01Corrected version2004-02-15Traveller irrigation machines — Part 1: Operational characteristics and laboratory and field test methods Machines d'irrigation mobiles — Partie 1: Caractéristiques de fonctionnement et méthodes d'essai en laboratoire et au champ
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ii © ISO 2003 — All rights reserved
ISO 8224-1:2003(E) © ISO 2003 — All rights reserved iii Contents Page Foreword.iv 1 Scope.1 2 Normative references.1 3 Terms, definitions and symbols.1 4 Functional aspects and technical information.8 5 Test specifications.8 5.1 General.8 5.2 Test liquid.8 5.3 Calculation of field resistance coefficient.9 5.4 Sampling and general preparation of test traveller irrigation machine.10 5.5 Specific machines.10 6 Laboratory uniformity tests.10 6.1 General.10 6.2 Test conditions.11 6.3 Apparatus.14 6.4 Required pre-test data.17 6.5 Procedure.18 6.6 Processing laboratory uniformity test data.20 6.7 Presentation of results.22 7 Laboratory drive tests.27 7.1 General.27 7.2 Laboratory drive test equipment.27 7.3 Laboratory drive test conditions.27 7.4 Laboratory drive test procedure.28 7.5 Laboratory drive test results.28 8 Field uniformity tests.28 8.1 General.28 8.2 Apparatus.29 8.3 Field uniformity test procedure.30 8.4 Field uniformity test data processing and results.32 8.5 Graphs of field uniformity test results.36
ISO 8224-1:2003(E) iv © ISO 2003 — All rights reserved 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 8224-1 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 second edition cancels and replaces the first edition (ISO 8224-1:1985), which has been technically revised. ISO 8224 consists of the following parts, under the general title Traveller irrigation machines: =Part 1: Operational characteristics and laboratory and field test methods =Part 2: Softwall hose and couplings — Test methods This corrected version of ISO 8824-1:2003 incorporates the following corrections. The French title has been corrected. A redundant reference to the three travelling rate settings has been deleted from 6.2.2 b). Cross-references have been corrected. A typographical error in the title of Figure 6 has been corrected. The y-axis legend fo Figure 7 d) has been corrected to indicate travel speed. The arrows indicating pressure and flow rate in Figure 7 e) now correspond to the appropriate longitudinal variations shown on the graph. The reference to the role of the third pressure gauge in 8.2.4 has been clarified. In 8.4.3.1 d), the explanation of the ratio has been given its true sense. The same has been done in respect of the different ratio mentioned in 8.4.3.2.
INTERNATIONAL STANDARD ISO 8224-1:2003(E) © ISO 2003 — All rights reserved 1 Traveller irrigation machines — Part 1: Operational characteristics and laboratory and field test methods 1 Scope 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 centre-pivot
and moving lateral irrigation machines. 2 Normative references The following referenced documents are indispensable for the application 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 7749-2:1990, Irrigation equipment — Rotating sprinklers — Part 2: Uniformity of distribution and test methods ISO 8026, Agricultural irrigation equipment — Sprayers — General requirements and test methods ISO 11545, Agricultural irrigation equipment — Centre-pivot and moving lateral irrigation machines with sprayer or sprinkler nozzles — Determination of uniformity of water distribution 3 Terms, definitions and symbols For the purposes of this document, the following terms, definitions and symbols (see Table 1) apply. 3.1 traveller irrigation machine machine designed to irrigate a field sequentially, strip by strip, by causing, through various coiling techniques, a cart equipped with a travelling water distribution system (sprinkler or gun-type sprinkler, combination of sprinklers and guns, boom with set of sprinklers, sprayers or other kinds of water distribution devices) to travel SIST EN ISO 8224-1:2004

ISO 8224-1:2003(E) 2 © ISO 2003 — All rights reserved across a field, and which is intended to be moved to, and operated from, several supply points established in advance in the field NOTE There are three types of traveller irrigation machine, each having a structure that includes a reel, spool or winch and a travelling water distribution system. =Type 1 traveller irrigation machines feature a stationary reel with a hydraulic motor that coils and drags a distribution tube and a travelling cart that supports a water distribution system — commonly referred to as “reel machines” (see 3.2). =Type 2 traveller irrigation machines feature a travelling winch with a hydraulic motor that supports a water distribution system, coils a tow cable and drags a distribution hose — commonly referred to as “travellers” (see 3.3). =Type 3 traveller irrigation machines feature a travelling reel that supports a water distribution system with self-propelled wheels and coiling a stationary distribution tube — commonly referred to as “self-propelled reel machines” (see 3.4) — or they can be engine-driven machines. 3.2 reel machine type 1 traveller irrigation machine featuring a stationary reel coiling a distribution tube that drags a travelling cart on which is installed a water distribution system (most often a gun-type sprinkler) and carries water to the water distribution system See Figure 1.
Key 1 water source 2 stationary reel 3 source connection conduit/hose 4 distribution tube — dragged 5 cart 6 water distribution device or system — gun, sprinkler, boom (on cart) 7 direction of movement Figure 1 — Sketch of operating type 1 traveller irrigation machine — Reel machine 3.3 traveller type 2 traveller irrigation machine featuring a travelling winch with hydraulic motor supporting a water distribution system, which coils a cable and drags a distribution hose See Figure 2. SIST EN ISO 8224-1:2004

ISO 8224-1:2003(E) © ISO 2003 — All rights reserved 3
Key 1 tow cable anchor 2 tow cable 3 cart 4 water distribution device or system — gun, sprinkler, boom (on cart) 5 water source 6 distribution hose — dragged 7 direction of movement Figure 2 — Sketch of operating type 2 traveller irrigation machine — Traveller 3.4 self-propelled reel machine type 3 traveller irrigation machine featuring a stationary distribution tube that carries irrigation water to a travelling structure accommodating a reel on which the distribution tube is coiled, a drive train, self-propelled wheels and water distribution system See Figure 3.
Key 1 water source 2 distribution tube 3 self-propelled structure 4 water distribution device or system — gun, sprinkler, boom (on self-propelled structure) 5 direction of movement Figure 3 — Sketch of operating type 3 traveller irrigation machine — Self-propelled reel machine SIST EN ISO 8224-1:2004

ISO 8224-1:2003(E) 4 © ISO 2003 — All rights reserved 3.5 water distribution system sprinkling and travelling part of a traveller irrigation machine through which irrigation water is distributed and applied over a strip EXAMPLE Sprinkler, gun-type sprinkler, combination of sprinklers and gun-type sprinklers, boom with set of sprinklers or sprayers 3.6 field resistance coefficient α coefficient characterizing the resistance drag force exerted by the field on a traveller irrigation machine whose water distribution system is travelling along a strip 3.7 distribution tube in-field supply tube polyethylene tube supply line that conveys irrigation water along an irrigated strip to the water distribution system of a type 1 traveller irrigation machine (reel machine) and to the self-propelled structure of a type 3 traveller irrigation machine (self-propelled reel machine), and which can be partly lying on the field and partly coiled on the spool 3.8 distribution hose softwall distribution hose in-field supply hose supply hose that conveys water from an irrigation water source along a strip to the water distribution system of a type 2 traveller irrigation machine (traveller) 3.9 source connection hose source connection conduit supply conduit or hose used to connect an irrigation water source to the stationary structure of a type 1 traveller irrigation machine (reel machine) 3.10 irrigation strip lane portion of a field irrigated sequentially by a traveller irrigation machine, typically consisting of a rectangle a few decametres wide by a few hundred metres long with an effective zone wetted by the water distribution system that significantly exceeds the dimensions of the strip and especially the width; some overlapping of the wetted patterns over adjacent strips often being required to maintain an acceptable uniformity of water application over the entire field 3.11 irrigation strip width lane width strip spacing spacing between strips, i.e. distance between two adjacent travel paths of a cart 3.12 travel path path within a strip where the water distribution system is supported during its irrigation travel on wheels or skids and where the distribution tube, distribution hose or tow cable is laid in contact with the field and dragged SIST EN ISO 8224-1:2004

ISO 8224-1:2003(E) © ISO 2003 — All rights reserved 5 3.13 length of travel distance a traveller irrigation machine moves along its travel path within a strip, from starting point to final stop position, not exceeding the length of the distribution tube in the case of types 1 and 3 irrigation machines or twice the length of the distribution hose in the case of type 2 3.14 spool component of a traveller irrigation machine, consisting of a drum with flanges, rotating on an axial shaft and designed for storing the part of the distribution tube (types 1 and 3 irrigation machines) or tow cable (type 2 irrigation machines) not lying in contact with the field; in the case of certain type 2 traveller irrigation machines, an additional component designed for storing the distribution hose when the machine is not irrigating See Figure 4. 3.15 coefficient of variation Cv ratio of the standard deviation to the mean of a variable that is repeatedly measured SIST EN ISO 8224-1:2004

ISO 8224-1:2003(E) 6 © ISO 2003 — All rights reserved
Key A structure
1 spool drum B distribution tube
2 shaft of spool C cart or trolley
3 brakes of spool C1 current cart or trolley position
4 control device for water distribution system travel C2 most distant cart or trolley position
5 machine-source connection hose (supply hose)
6 spool support — fixed or orientable turntable
7 wheel
8 chassis
9 external power shaft
10 stabilizer legs
11 distribution tube guide mechanism
12 cart (or trolley) lifting device d spool drum diameter
13 hydraulic drive (turbine or piston) and drive train ∅ distribution tube outer diameter
14 distribution tube (usually polyethylene tube) Lref distribution tube reference length
15 cart skid L current length of moving portion of distribution tube laid down and dragged on field
16 water distribution system — irrigation sprinkler(s), sector-adjustable gun-type sprinkler, boom or other system
17 cart wheel Figure 4 — Type 1 traveller irrigation machine (reel machine) — Main parts SIST EN ISO 8224-1:2004

ISO 8224-1:2003(E) © ISO 2003 — All rights reserved 7 Table 1 — Symbols Symbol Description Unit d Spool drum diameter m E Irrigation strip width, also called strip spacing m F Field resistance force N Fbench Actual resistance force applied using the bench N Fref Desired resistance force N hAi Mean application depth at line i collected while the water distribution system travels a segment equal to the wetted radius mm hAs Mean application depth averaged over the strip mm hGA Gross application depth mm hGAseg Gross application depth over a segment mm Ii Reference application rate for line i mm/h Is Reference application rate for the strip mm/h L Length of part of the distribution tube or distribution hose lying on the field and dragged (types 1 and 2), or length of part of distribution tube lying on the field (type 3) m Lref Length of the distribution tube or hose m Ls Length of the strip m Ltravel Travel distance of the water distribution system (m) P Weight per unit length of the distribution tube or hose when full of water N/m PTotal Total weight of the traveller irrigation machine when full of water N q Test flow rate m3/h Rwet Wetted radius m s Spacing between collectors on a line m T Duration time for irrigation h ν Travel speed of the water distribution system m/h νi Travel speed of the water distribution system at line i, computed as the mean travel speed over a segment equal to the wetted radius m/h νs Travel speed of the water distribution system computed as the mean travel speed over the strip m/h α Field resistance and slope coefficient (dimensionless)∆Lseg Segment length (travel distance across a segment) m ∆Vseg Volume of water distributed over a segment m3 ∅ Distribution tube or hose diameter mm
ISO 8224-1:2003(E) 8 © ISO 2003 — All rights reserved 4 Functional aspects and technical information The recommended range of operation and other functional aspects relevant for the users of the traveller irrigation machine shall be specified and included in the documentation accompanying the traveller irrigation machine. These shall include at least the following specifications: a) recommended minimum and maximum working pressures at the machine inlet connection; b) recommended maximum permissible pressure in any situation at the machine inlet; c) recommended minimum and maximum flow rates; d) distribution characteristics of the recommended water distribution system or systems; e) length, diameter and wall thickness of the distribution tube or distribution hose; f) recommended maximum road towing speed; g) recommended maximum land gradient when operating; h) recommended maximum coiling speed; i) recommended maximum external power shaft speed, if applicable; j) safety instructions; k) operating instructions. 5 Test specifications 5.1 General The tests include =laboratory uniformity tests (see Clause 6), =laboratory drive tests (see Clause 7), and =field uniformity tests (see Clause 8). Conduct the tests in accordance with the following specifications for test liquids and machine sampling and preparation. 5.2 Test liquid 5.2.1 General Traveller irrigation machines are intended to operate with unfiltered or coarsely filtered irrigation water that may occasionally or continuously carry clogging materials of various types, sizes and concentrations. Consequently, traveller irrigation machine hydraulic control lines or hydraulic drive circuits are often equipped with filters or centrifugal separators. SIST EN ISO 8224-1:2004

ISO 8224-1:2003(E) © ISO 2003 — All rights reserved 9 5.2.2 Field uniformity tests For the standard test liquid in field uniformity tests, use the irrigation water available on the test field, unmodified for the purpose of the test by filtration, injection of chemicals or by any other process, unless specifically requested by the client. 5.2.3 Laboratory uniformity and drive tests For the standard test liquid in laboratory uniformity tests and laboratory drive tests, use irrigation water at a temperature of between 4°C and 35°C, in which the concentration of clogging materials is not more than 1 g/l and which has passed through =a 5 mm aperture screen, if the water distribution device is a gun-type sprinkler, or =a 500 µm aperture screen, if the water distribution device is not a gun-type sprinkler. Optionally, upon client request, after running the traveller irrigation machine reference tests with the standard test liquid, the tests may be run again with water having an increased range of sizes or concentrations, or both, of clogging materials, or with other liquids together with extended information on the traveller irrigation machine's performance. 5.3 Calculation of field resistance coefficient Calculate the value of the coefficient, α, characterizing the resistance drag force exerted by the field on a traveller irrigation machine when its water distribution system travels along a strip, as follows. =For types 1 and 2 traveller irrigation machines: as the ratio between the field resistance force and the weight of the part of the distribution tube or hose lying on the field and being dragged at that time, using the equation FPLα=× where α is the field resistance coefficient (dimensionless); F is the field resistance force, in newtons; P is the weight per unit length of the distribution tube or hose full of water, in newtons per metre; L is the length of that part of the distribution tube or hose lying on the field and dragged, in metres. =For type 3 traveller irrigation machines: as the ratio between the field resistance force and the weight of the machine inclusive of the coiled part of the tube, using the equation ()TotalFPPLα=−× where α is the field resistance coefficient (dimensionless); F is the field resistance force, in newtons; P is the weight per unit length of the distribution tube or hose full of water, in newtons per metre; L is the length of that part of the distribution tube or distribution hose lying on the field, in metres; PTotal is the total weight of the traveller irrigation machine full of water, in newtons. SIST EN ISO 8224-1:2004

ISO 8224-1:2003(E) 10 © ISO 2003 — All rights reserved 5.4 Sampling and general preparation of test traveller irrigation machine 5.4.1 Type tests a) Select the sample traveller irrigation machine to be tested from a series of products representative of the model, unmodified for the purpose of the tests. Select water distribution system components (e.g. nozzles) in accordance with the manufacturer’s operating instructions and to meet pressure test conditions. b) Ensure that the traveller irrigation machine supplied for test purposes and the accompanying technical and operating documentation are the same as delivered by the manufacturer to users. c) Visually check the traveller irrigation machine to be tested for conformity with the data provided by the manufacturer in the manufacturer’s literature and report any deviations from those data. d) Describe the necessary actions for making the settings for the traveller irrigation machine. e) Test the traveller irrigation machine in accordance with the manufacturer’s operating instructions. 5.5 Specific machines A specific traveller irrigation machine, submitted for evaluation for field or laboratory uniformity of water application or drive performance, may be selected by the client. 6 Laboratory uniformity tests 6.1 General 6.1.1 Purpose These tests of the uniformity of water application reproduce, in the laboratory, the typical operation of a traveller irrigation machine of a given type and water distribution system along the entire length of travel of the distribution system for a number of specific standardized conditions covering the machine's range of operation. They enable monitoring of all performance parameters, including hydraulic and power conditions and travel of the water distribution system along the strip, and the determination of the reference traveller irrigation machine's water distribution performance by characterizing its water application pattern under zero-to-low-wind conditions along the entire strip. 6.1.2 Preparation Prior to the test, select the appropriate water application test data for the installed water distribution system in accordance with International Standards for these water distribution systems (see ISO 7749-2 and ISO 8026), under zero-to-low-wind conditions. Select the test strip dimensions, i.e. length, Ls, and width, E, of the test strip, as follows. a) Select Ls for the test of not less than the length of travel, Ltravel, of the water distribution system. Ensure that Ltravel for the test is not less than 90 % of the length, Lref, of the distribution tube (types 1 and 3) or tow cable (type 2). Ensure that Ltravel falls entirely within Ls. b) Select E for the test in accordance with the manufacturer’s operating instructions. SIST EN ISO 8224-1:2004

ISO 8224-1:2003(E) © ISO 2003 — All rights reserved 11 6.1.3 Type tests The type tests are performed under a set of 11 laboratory test conditions covering the range of operating conditions and settings declared by the manufacturer (see 6.2.2 and Table 2). Consequently, the test report and conclusions shall reflect that the traveller irrigation machine was tested for uniformity of water distribution in the laboratory in accordance with this set of 11 laboratory uniformity test conditions. 6.1.4 Basic tests The basic tests are used to estimate on a preliminary basis the water distribution performance that would be determined by the full set of type tests. The test conditions to be satisfied in the basic tests shall consist of test conditions 2, 6 and 10 (see Table 2) and one other test condition to be selected by the manufacturer from the set of 11 test conditions. The test report and conclusions shall reflect that the traveller irrigation machine was tested for uniformity of water distribution in the laboratory — not for the entire set of 11 test conditions, but only for a limited number of selected conditions: test conditions 2, 6, 10 and the other, selected, test condition. 6.2 Test conditions 6.2.1 General This test is performed on a standard and fully operational traveller irrigation machine (unless specified otherwise by a client), ready for use in the field and including all of its operative parts and accessories. The laboratory test conditions reflect three different types of operating conditions: =field resistance conditions, =machine supply water conditions, and =conditions for setting directly or indirectly travelling speed for the water distribution system. 6.2.2 Combined test conditions The 11 laboratory uniformity test conditions given in Table 2 cover at least part of the machine operating range recommended by the manufacturer for field resistance (see 6.2.3), machine supply water pressure (see 6.2.4) and travel speed (see 6.2.5). They are as follows: a) one test condition (the reference condition, or test condition 1) in the middle of the operating range for travel speed, field resistance and machine supply water pressure with a medium travel speed setting, a medium low field resistance coefficient and a medium supply water test pressure setting; b) nine test conditions (test conditions 2 to 10) with three travel speed settings, a medium-high field resistance coefficient, and three machine supply water test pressures; c) one test condition (test condition 11) with a low travel speed setting, a medium-low field resistance coefficient and a high machine supply water test pressure. These test conditions are applicable to types 1 and 2 traveller irrigation machines with gun-type water distribution systems. SIST EN ISO 8224-1:2004

ISO 8224-1:2003(E) 12 © ISO 2003 — All rights reserved Table 2 — Type test conditions for types 1 and 2 machines (with gun-type water distribution systems) Condition Machine travel speed setting Field resistance coefficient Pressure to machine inlet No. m/h α MPa 1 30 (medium) 0,5 (medium-low) 0,8 (medium) 2 (basic) 10 (low) 3 30 (medium) 4 50 (high) a 1,0 (high) 5 10 (low) 6 (basic) 30 (medium) 7 50 (high) a 0,8 (medium) 8 10 (low) 9 30 (medium) 10 (basic) 50 (high) a 0,8 (medium-high) 0,6 (low) 11 10 (low) 0,5 (medium-low) 1,0 (high) a If the maximum recommended speed setting is below 50 m/h, use the maximum recommended speed setting.
6.2.3 Simulated field resistance conditions The laboratory uniformity tests shall be conducted under the following assumptions.
a) The simulated field is flat and level, so that the nozzle or nozzles of the water distribution system can be assumed to remain at the same elevation over Ltravel, with a slope tolerance of ± 1 % along the travel path. b) The field resistance force that the operating traveller irrigation machine must overcome meets the following specific requirements for each type of traveller irrigation machine: 1) for type 1 (reel machines), the field resistance force shall be proportional to the length of distribution tube laid down on the strip between the cart and the reel, to the weight of a unit length of the distribution tube full of water and to α; 2) for type 2 (travellers), the field resistance force shall be proportional to the length of the distribution hose laid down on the strip between the cart and the remote bend of the distribution hose, to the weight of a unit length of the distribution hose full of water and to α; 3) for type 3 (self-propelled reel machines), the field resistance force shall be proportional to the weight of the traveller irrigation machine, inclusive of the coiled part of the distribution tube and the water contained in the coiled part of the distribution tube and to α. The field resistance coefficient, α, combines friction and slope effects to characterize the comprehensive force induced by the field resistance, slope or both. The test shall be run for two field resistance conditions. The values of α applicable for laboratory uniformity tests of types 1 and 2 traveller irrigation machines shall be in accordance with Table 3. For type 3 machines, two values of α shall be selected to reflect medium-high and medium-low field resistance and slope conditions. These values shall be determined from preliminary experiments or test literature. SIST EN ISO 8224-1:2004

ISO 8224-1:2003(E) © ISO 2003 — All rights reserved 13 Table 3 — Laboratory uniformity test field resistance coefficient values for types 1 and 2 Field resistanceα Typical interpretation Field resistance condition number Type 1 Type 2 Field resistance and slope conditions 1 0,8 Medium-high 2 0,5 Medium-low NOTE The typical values of α observed in practice usually range from 1,0 (high) to 0,3 (low).
6.2.4 Machine supply water conditions 6.2.4.1 General The machine supply water conditions consist of the pressure delivered to the inlet of the machine and the flow capacity of the water distribution system at this pressure, as determined by, and discharged from, the appropriately sized nozzle or nozzle package. Conduct the tests under three machine supply water test pressure conditions at the inlet to the source connection hose. Select these test pressures to represent the range of working pressures recommended by the manufacturer. 6.2.4.2 Test pressures 6.2.4.2.1 Machine supply water test pressure conditions The three machine supply water test pressure conditions associated with the appropriate water distribution system nozzle package are =medium test pressure, for characterizing the performance of the traveller irrigation machine under typical working pressure conditions — usually in the middle of the range of working pressures recommended by the manufacturer and possibly corresponding to the pressure used for machine design, =minimum test pressure, for characterizing the performance of the traveller irrigation machine at the low-pressure end of the range of working pressures recommended by the manufacturer, and =maximum test pressure, for characterizing the performance of the traveller irrigation machine at the high-pressure end of the range of working pressures recommended by the manufacturer. In all three cases, maintain supply water pressure conditions at the required test values throughout the tests, with an accuracy in accordance with 6.3.1. 6.2.4.2.2 Machines with gun-type water distribution systems For machines with a gun-type water distribution system, employ the test pressures 0,6, 0,8 and 1,0 MPa and select a gun nozzle selected to allow a pressure at the inlet of the gun sufficient to insure proper operation and acceptable transverse uniformity performance in water application — usually a gun inlet pressure of 0,4 MPa to 0,5 MPa. 6.2.4.2.3 Machines with sprinkler- or boom-type water distribution systems For machines with a water distribution system other than a gun-type water distribution system, set the medium test pressure as follows. =For sprinkler-type water distribution systems, the medium test pressure for the supply water shall be 0,6 MPa. Select the nozzle package so that the sprinkler inlet pressure conforms to the manufacturer’s specifications. SIST EN ISO 8224-1:2004

ISO 8224-1:2003(E) 14 © ISO 2003 — All rights reserved =For boom-and-spray-type water distribution systems, the medium test pressure for the supply water shall be 0,4 MPa. Select the nozzle package so that boom nozzle pressure conforms to the manufacturer’s specifications. Select the minimum and maximum test pressures according to the manufacturer’s literature by agreement between client and tester. 6.2.5 Travel speed condition settings Run the tests for the required values of field resistance coefficient conditions and machine supply water conditions, at three standard settings for travel speed, ν, of the water distribution system covering the range of the settings for the travel speed, as follows. a) For testing traveller irrigation machines with a gun-type water distribution system, use test settings for ν of 1) 10 m/h as the minimum travel speed setting, 2) 30 m/h as the medium speed setting, and 3) 50 m/h or the maximum travel speed setting recommended in the manufacturer’s documentation, whichever is the lesser. b) For testing traveller irrigation machines with other types of water distribution systems, use test settings for ν of 1) one minimum setting, corresponding to the minimum travel speed setting recommended by the manufacturer, 2) one medium setting, approximately 30 m/h, and 3) one maximum setting, corresponding to the maximum travel speed setting recommended by the manufacturer. 6.3 Apparatus 6.3.1 Measurement devices For laboratory uniformity tests, measurement devices shall be capable of measuring the actual value with a precision of ± 1 % of the actual value, unless otherwise specified hereinafter. They shall be selected according to the type of traveller irrigation machine to be tested and to enable continuous monitoring of the operation of the traveller irrigation machine throughout the test, typically for up to 40 h or more. The measurement devices, consisting of the following apparatus, shall be connected to appropriate data storage and recording devices. 6.3.1.1 Pressure gauges, three or more, as appropriate, with a range of 1,6 MPa and an accuracy of ± 0,5 % of actual value. 6.3.1.2 Time instrument, for the recording and storage of data, with an accuracy of ± 0,1 s. 6.3.1.3 Flow meter 6.3.1.4 Dynamometer, with a range of 7 000 daN and an accuracy of ± 0,5 % of actual value. 6.3.1.5 Graduated, calibrated or weighing tanks, or flow meters, in size and number as appropriate for measuring the volume of water released from a hydrostatic drive or, if applicable, from a piston or bellow hydrostatic drive. 6.3.1.6 Rotational speed meter or tachometer, for measuring the rotational speed of a hydrodynamic drive or, if applicable, the rotational speed of the axis of a turbine hydrodynamic drive. SIST EN ISO 8224-1:2004

ISO 8224-1:2003(E) © ISO 2003 — All rights reserved 15 6.3.1.7 Linear displacement meter (odometer), for measuring the travel distance of the water distribution system. 6.3.1.8 Linear speed meter (speedometer), for measuring the linear travel speed of the water distribution system. The measurement of travel distance and travel speed of the water distribution system may be achieved by use of a single sensor. 6.3.2 Test bench 6.3.2.1 Water source (including pressure supply and regulation) The test bench water source shall be capable of covering the whole range of flow rates and pressures required for the operation of the traveller irrigation machine under test, and for maintaining the pressures at the reference values within ± 1% accuracy and with a response time of less than 15 s. 6.3.2.2 Resistance force device 6.3.2.2.1 The resistance force device shall be selected and installed to induce a bench resistance force, Fbench, that simulates the resistance force, F, exerted on the traveller irrigation machine during irrigation. This resistance force shall reflect the type of machine being tested and the dependence of the field resistance force on the position of the water distribution system in the strip. 6.3.2.2.2 For types 1 and 2 traveller irrigation machines, the resistance force device shall be capable of producing an Fbench equal to F exerted in the field on the traveller irrigation machine by the distribution tube (type 1) or distribution hose (type 2). Fbench, which is usually measured using a dynamometer, should be equal at all times to the desired resistance force, Fref, continuously applied to the resistance
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