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1、BRITISH STANDARD BS ISO 6686:1995 Implementation of ISO 6686:1995 Equipment for crop protection Anti-drip devices Determination of performance ICS 65.060.40 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 6686:1995 This British Standa
2、rd, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 December 1995 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference AGE/15 Draft for comment
3、93/702635 DC ISBN 0 580 24990 5 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee AGE/15, Equipment for crop protection, upon which the following bodies were represented: Agricultural Engineers Association British Agrochemi
4、cals Association Ltd. British Crop Protection Council Health and Safety Executive Imperial College of Science and Technology Institution of Agricultural Engineers Incorporated Long Ashton Research Station Ministry of Agriculture, Fisheries and Food National Association of Agricultural Contractors Na
5、tional Farmers Union Silsoe Research Institute Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 6686:1995 BSI 02-2000i Contents Page Committees responsibleInside front cover Nati
6、onal forewordii Forewordiii Text of ISO 66861 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 6686:1995 ii BSI 02-2000 National foreword This British Standard reproduces verbatim ISO 6686:1995 and implements it as the UK national stan
7、dard. This British Standard is published 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,
8、and keep UK interests informed; monitor 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 W4 4AL. A British Standard does no
9、t purport to include all the necessary 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 f
10、ront cover, pages i and ii, the ISO title page, pages ii to iv, pages 1 to 6 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. Licensed Copy: sheffieldun sheffieldun
11、, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 6686:1995(E) ii BSI 02-2000 Contents Page Forewordiii 1Scope1 2Test liquid1 3Apparatus1 4General test conditions1 4.1Tem
12、perature1 4.2Pressures1 5Tests1 5.1Uniformity of flowrates obtained with two nozzles and different antidrip devices of same type1 5.1.1 Choice of nozzles1 5.1.2 Sampling of antidrip devices1 5.1.3 Test procedure1 5.1.4 Results1 5.2Variation in flowrates according to pressure for two nozzles with ant
13、idrip device1 5.2.1 Choice of antidrip device1 5.2.2 Test procedure1 5.2.3 Results1 5.3Opening and closing pressures1 5.3.1 Test procedure1 5.3.2 Results2 6Test report2 Annex A (normative) Example of test report for antidrip devices for sprayers3 Descriptors: Agricultural engineering, crop protectio
14、n, agricultural equipment, crop treatment equipment, sprayers, agricultural sprayers, nozzles, tests, performance tests, test result sheets. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 6686:1995(E) BSI 02-2000iii Foreword ISO (the In
15、ternational 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 h
16、as 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
17、 standardization. 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. International Standard ISO 6686 was prepared by Technic
18、al Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 6, Equipment for crop protection. This second edition cancels and replaces the first edition (ISO 6686:1981), of which it constitutes a technical revision. Annex A forms an integral part of this Internationa
19、l Standard. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 6686:1995(E) BSI 02-20001 1 Scope This International Standard
20、 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-held or hand-operated sprayers. 2 Test liquid
21、 2.1 Clean water, free from solids in suspension. 3 Apparatus 3.1 Pressure gauges, allowing the pressure to be measured with a precision of 1 % within the range of 0,03 MPa to 0,5 MPa. 3.2 Collection vessel for each nozzle. 3.3 Measuring cylinder or balance, to measure the quantity of liquid collect
22、ed. 3.4 Stopwatch 4 General test conditions 4.1 Temperature The temperatures of the water and room air shall be between 10 C and 25 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 5.1 Uniformity of flowrates obtain
23、ed with two nozzles and different antidrip devices of same type 5.1.1 Choice of nozzles For a pressure of 0,3 MPa, choose one nozzle with a minimum flowrate of 1 l/min and one nozzle with a maximum flowrate of 5 l/min, where this maximum flowrate is at least three times the minimum flowrate. The com
24、plete designation of the two nozzles used shall appear in the test report. 5.1.2 Sampling of antidrip devices Select at random 20 antidrip devices of the same type from a batch of 200. The sampling conditions shall be indicated in the test report, in particular the stock size, the place of sampling,
25、 etc. A second sampling of 20 antidrip 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 of 0,3 MPa, the flowrate of both nozzles without the antidrip devices and the flowrate
26、s 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 than 1 %. The measuring time, measured with an error of less than 1 s, shall be at least 60 s. 5.1.4 Results The flowrates shall be expressed in litr
27、es per minute. Indicate the flowrates at 0,3 MPa of the two nozzles without an antidrip device, the arithmetic means of the flowrates with the 20 antidrip devices, and the flowrate of each antidrip device, expressed as a mean percentage. Also report the coefficient of variation of the flowrates. 5.2
28、 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 the flowrates
29、of the two nozzles fitted with the antidrip devices and without antidrip devices, at pressures of 0,05 MPa, 0,1 MPa, 0,2 MPa, 0,3 MPa, 0,4 MPa and 0,5 MPa. 5.2.3 Results The flowrates shall be expressed in litres per minute. Indicate for each pressure the flowrates obtained with and without antidrip
30、 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, the 20 samples taken in 5.1.2 to each of the two nozzles. Increase the pressure i
31、n steps of 0,01 MPa from 0,03 MPa until the antidrip device opens. Record the opening pressure. Choose a pressure at least 0,05 MPa higher than the opening pressure. Decrease the pressure in steps of 0,01 MPa until the antidrip device closes. Record the closing pressure. Licensed Copy: sheffieldun s
32、heffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 6686:1995(E) 2 BSI 02-2000 5.3.2 Results Pressures shall be expressed in megapascals. For each of the two nozzles, indicate the opening and closing pressures for the 20 samples. Calculate the average opening and closi
33、ng pressures and indicate their coefficient of variation. 6 Test report An example of a test report is given in Annex A. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 6686:1995(E) BSI 02-20003 Annex A (normative) Example of test report
34、 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 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 6686:1995(E) 4 BSI 02-2000 A.2 Te
35、st results The temperatures of the water and the room air were between 10 C and 25 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 witho
36、ut antidrip device at a pressure of 0,3 MPa Arithmetic mean of the flowrates obtained with the 20 antidrip devices A.2.1.2 Table of results of antidrip device flowrate Anti device No.1234567891011121314151617181920 Nozzle No. 1 Flowrate as a percentage of mean rate Coefficient of variation1), % Nozz
37、le No. 2 Flowrate as a percentage of mean rate Coefficient of variation1), % For further details see ISO 3534-1:1993, Statistics Vocabulary and symbols Part 1: Probability and general statistical terms. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy
38、, (c) BSI ISO 6686:1995(E) BSI 02-20005 A.2.2 Variation in flowrate according to pressure for two nozzles with antidrip device A.2.2.1 Graph A.2.2.2 Table Pressure, MPa 0,050,10,20,30,40,5 Flowrate of nozzle No. 1 without antidrip device, l/min Flowrate of nozzle No. 1 with antidrip device, l/min Fl
39、owrate of nozzle No. 2 without antidrip device, l/min Flowrate of nozzle No. 2 without antidrip device, l/min Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ISO 6686:1995(E) 6 BSI 02-2000 A.2.3 Opening and closing pressures A.2.3.1 Results
40、Mean opening pressure Mean closing pressure A.2.3.2 Table Antidrip device No.1234567891011121314151617181920 Nozzle No. 1 Opening pressure, MPa Coefficient of variation1), % Nozzle No. 2 Opening pressure, MPa Coefficient of variation1), % For further details see ISO 3534-1:1993, Statistics Vocabular
41、y and symbols Part 1: Probability and general statistical terms. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI blank Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 27 03:24:07 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS ISO 6686:199
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