1、BRITISH STANDARD BS ISO 6686:1995 Implementation of ISO6686:1995 Equipment for crop protection Anti-drip devices Determination of performance ICS 65.060.40BSISO6686:1995 This BritishStandard, having been prepared under the directionof the Engineering SectorBoard, was published underthe authority of
2、the Standards Board and comesintoeffect on 15December1995 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference AGE/15 Draft for comment 93/702635 DC ISBN 0 580 24990 5 Committees responsible for this BritishStandard The preparation of this BritishStandard
3、 was entrusted to Technical Committee AGE/15, Equipment for crop protection, upon which the following bodies were represented: Agricultural Engineers Association British Agrochemicals Association Ltd. British Crop Protection Council Health and Safety Executive Imperial College of Science and Technol
4、ogy Institution of Agricultural Engineers Incorporated Long Ashton Research Station Ministry of Agriculture, Fisheries and Food National Association of Agricultural Contractors National Farmers Union Silsoe Research Institute Amendments issued since publication Amd. No. Date CommentsBSISO6686:1995 B
5、SI 02-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword iii Text of ISO6686 1BSISO6686:1995 ii BSI 02-2000 National foreword This BritishStandard reproduces verbatim ISO6686:1995 and implements it as the UK national standard. This BritishStandard is publish
6、ed under the direction of the Engineering Sector Board whose Technical Committee AGE/15 has the responsibility to: aid enquirers to understand the text; present to the responsible international committee any enquiries on interpretation, or proposals for change, and keep UK interests informed; monito
7、r related international and European developments and promulgate them in the UK. NOTEInternational and European Standards, as well as overseas standards, are available from Customer Services, BSI, 389 Chiswick High Road, London W44AL. A British Standard does not purport to include all the necessary
8、provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii, theISO title
9、page, pages ii to iv, pages1 to6 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.ISO6686:1995(E) ii BSI 02-2000 Contents Page Foreword iii 1 Scope 1 2 Test liquid 1
10、 3 Apparatus 1 4 General test conditions 1 4.1 Temperature 1 4.2 Pressures 1 5 Tests 1 5.1 Uniformity of flowrates obtained with two nozzles and different antidrip devices of same type 1 5.1.1 Choice of nozzles 1 5.1.2 Sampling of antidrip devices 1 5.1.3 Test procedure 1 5.1.4 Results 1 5.2 Variati
11、on in flowrates according to pressure for two nozzles with antidrip device 1 5.2.1 Choice of antidrip device 1 5.2.2 Test procedure 1 5.2.3 Results 1 5.3 Opening and closing pressures 1 5.3.1 Test procedure 1 5.3.2 Results 2 6 Test report 2 Annex A (normative) Example of test report for antidrip dev
12、ices for sprayers 3 Descriptors: Agricultural engineering, crop protection, agricultural equipment, crop treatment equipment, sprayers, agricultural sprayers, nozzles, tests, performance tests, test result sheets.ISO6686:1995(E) BSI 02-2000 iii Foreword ISO (the International Organization for Standa
13、rdization) 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 t
14、o 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. Draft Internation
15、al Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least75% of the member bodies casting a vote. International Standard ISO6686 was prepared by Technical Committee ISO/TC23, Tractors and ma
16、chinery for agriculture and forestry, Subcommittee SC6, Equipment for crop protection. This second edition cancels and replaces the first edition (ISO6686:1981), of which it constitutes a technical revision. Annex A forms an integral part of this International Standard.iv blankISO6686:1995(E) BSI 02
17、-2000 1 1 Scope This International Standard specifies a test method to determine, on the one hand, the effect of fitting antidrip devices on nozzle flowrates, and, on the other hand, the opening and closing pressures. It applies to antidrip devices of agricultural sprayer nozzles, except for hand-he
18、ld or hand-operated sprayers. 2 Test liquid 2.1 Clean water, free from solids in suspension. 3 Apparatus 3.1 Pressure gauges, allowing the pressure to be measured with a precision of1% within the range of0,03MPa to0,5MPa. 3.2 Collection vessel for each nozzle. 3.3 Measuring cylinder or balance, to m
19、easure the quantity of liquid collected. 3.4 Stopwatch 4 General test conditions 4.1 Temperature The temperatures of the water and room air shall be between10 C and25 C. 4.2 Pressures Each pressure of the liquid shall remain constant with a maximum deviation of 2,5% about the mean pressure. 5 Tests
20、5.1 Uniformity of flowrates obtained with two nozzles and different antidrip devices of same type 5.1.1 Choice of nozzles For a pressure of0,3MPa, choose one nozzle with a minimum flowrate of1l/min and one nozzle with a maximum flowrate of5l/min, where this maximum flowrate is at least three times t
21、he minimum flowrate. The complete designation of the two nozzles used shall appear in the test report. 5.1.2 Sampling of antidrip devices Select at random20 antidrip devices of the same type from a batch of200. The sampling conditions shall be indicated in the test report, in particular the stock si
22、ze, the place of sampling, etc. A second sampling of20antidrip devices shall be taken by an authorized person of a test centre, to cover the case of a problem with the first sample. 5.1.3 Test procedure Measure, at the reference pressure of0,3MPa, the flowrate of both nozzles without the antidrip de
23、vices and the flowrates when the antidrip devices of the sample are attached in succession to the two nozzles. The volume discharged shall be measured with an error of less than1%. The measuring time, measured with an error of less than1s, shall be at least60s. 5.1.4 Results The flowrates shall be e
24、xpressed in litres per minute. Indicate the flowrates at0,3MPa of the two nozzles without an antidrip device, the arithmetic means of the flowrates with the20antidrip devices, and the flowrate of each antidrip device, expressed as a mean percentage. Also report the coefficient of variation of the fl
25、owrates. 5.2 Variation in flowrates according to pressure for two nozzles with antidrip device 5.2.1 Choice of antidrip device Use the antidrip device which has the flowrate closest to the mean of the flowrates obtained with the various antidrip devices of the sample. 5.2.2 Test procedure Measure th
26、e flowrates of the two nozzles fitted with the antidrip devices and without antidrip devices, at pressures of0,05MPa, 0,1MPa, 0,2MPa, 0,3MPa,0,4MPa and0,5MPa. 5.2.3 Results The flowrates shall be expressed in litres per minute. Indicate for each pressure the flowrates obtained with and without antid
27、rip devices. Indicate the results in the test report in the form of graphs (flowrate on the ordinate and pressure on the abscissa) and/or a table. 5.3 Opening and closing pressures 5.3.1 Test procedure Fit, in succession, the20 samples taken in5.1.2 to each of the two nozzles. Increase the pressure
28、in steps of0,01MPa from0,03MPa until the antidrip device opens. Record the opening pressure. Choose a pressure at least0,05MPa higher than the opening pressure. Decrease the pressure in steps of0,01MPa until the antidrip device closes. Record the closing pressure.ISO6686:1995(E) 2 BSI 02-2000 5.3.2
29、Results Pressures shall be expressed in megapascals. For each of the two nozzles, indicate the opening and closing pressures for the20 samples. Calculate the average opening and closing pressures and indicate their coefficient of variation. 6 Test report An example of a test report is given inAnnex
30、A.ISO6686:1995(E) BSI 02-2000 3 Annex A (normative) Example of test report for antidrip devices for sprayers A.1 Identification of antidrip devices and nozzles tested A.1.1 Antidrip devices A.1.2 Nozzles Nozzle No. 1 Nozzle No. 2 ISO6686:1995(E) 4 BSI 02-2000 A.2 Test results The temperatures of the
31、 water and the room air were between10 C and25 C. The pressures remained constant within 2,5% of the mean pressure. A.2.1 Uniformity of flowrates with two nozzles and different antidrip devices A.2.1.1 Results of nozzle flowrates Flowrate of the two nozzles without antidrip device at a pressure of0,
32、3MPa Arithmetic mean of the flowrates obtained with the20 antidrip devices A.2.1.2 Table of results of antidrip device flowrate Anti device No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Nozzle No. 1 Flowrate as a percentage of mean rate Coefficient of variation 1) ,% Nozzle No. 2 Flowrate a
33、s a percentage of mean rate Coefficient of variation 1) ,% For further details see ISO3534-1:1993, Statistics Vocabulary and symbols Part1: Probability and general statistical terms.ISO6686:1995(E) BSI 02-2000 5 A.2.2 Variation in flowrate according to pressure for two nozzles with antidrip device A
34、.2.2.1 Graph A.2.2.2 Table Pressure, MPa 0,05 0,1 0,2 0,3 0,4 0,5 Flowrate of nozzle No. 1 without antidrip device, l/min Flowrate of nozzle No. 1 with antidrip device, l/min Flowrate of nozzle No. 2 without antidrip device, l/min Flowrate of nozzle No. 2 without antidrip device, l/minISO6686:1995(E
35、) 6 BSI 02-2000 A.2.3 Opening and closing pressures A.2.3.1 Results Mean opening pressure Mean closing pressure A.2.3.2 Table Antidrip device No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Nozzle No. 1 Opening pressure, MPa Coefficient of variation 1) ,% Nozzle No. 2 Opening pressure, MPa Co
36、efficient of variation 1) ,% For further details see ISO3534-1:1993, Statistics Vocabulary and symbols Part1: Probability and general statistical terms.blankBS ISO 6686:1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for p
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