1、BSI Standards PublicationBS ISO 18471:2015Agricultural irrigationequipment Filters Verification of filtration gradeBS ISO 18471:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 18471:2015.The UK participation in its preparation was entrusted to TechnicalCom
2、mittee AGE/30, Irrigation and drainage equipment.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Stan
3、dards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 81113 5ICS 65.060.35Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2015.A
4、mendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS ISO 18471:2015 ISO 2015Agricultural irrigation equipment Filters Verification of filtration gradeMatriel agricole dirrigation Filtres Vrification du grade de filtrationINTERNATIONAL STANDARDISO18471First edition2015-10-15Ref
5、erence numberISO 18471:2015(E)BS ISO 18471:2015ISO 18471:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any mea
6、ns, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-121
7、4 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 18471:2015ISO 18471:2015(E)Foreword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Summary of the test method 25 CCM structure and operation 25.1 Construction 25.1.1 Sampler (1
8、) . 25.1.2 Control unit (2) . 25.2 Mode of operation 26 CCM test screen characteristics . 37 ccuracy of measurements 48 Test system layout . 49 Test procedure 5Bibliography 7 ISO 2015 All rights reserved iiiContents PageBS ISO 18471:2015ISO 18471:2015(E)ForewordISO (the International Organization fo
9、r 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
10、 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.The proced
11、ures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial
12、 rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).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. Details of any patent rights id
13、entified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an explanatio
14、n on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.The committee responsible for this document
15、is ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 18, Irrigation and drainage equipment and systems.iv ISO 2015 All rights reservedBS ISO 18471:2015INTERNATIONAL STANDARD ISO 18471:2015(E)Agricultural irrigation equipment Filters Verification of filtration grade1 Sco
16、peThis International Standard specifies 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 manufacturers declaration about the filtration grade of a specific filter.This test
17、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.2 Normative referencesThe following d
18、ocuments, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 9644, Agricultural
19、irrigation equipment Pressure losses in irrigation valves Test method3 Terms and definitionsFor the purpose of this document, the following terms and definitions apply.3.1filtration gradenumber, declared by the manufacturer, that represents the size of water passages in a filter and is related to it
20、s ability to stop particlesNote 1 to entry: The filtration grade is expressed in micrometres (m, microns).3.2clogging capacity meterCCMdevice used for measuring the time to reach a specified pressure loss across a standard filter screen, at a constant flow rate3.3aperture widthdistance between two a
21、djacent parallel wires in a square-mesh wire cloth screen plain-weave3.4mesh countnumber of apertures per unit of linear measure in a woven wire cloth or wire screenSOURCE: ISO 9045:1990, 3.2.83.5flow ratevolume of water flowing through a device per unit time ISO 2015 All rights reserved 1BS ISO 184
22、71:2015ISO 18471:2015(E)3.6pressure lossdifference in pressure due to water flow between two specified points in a system or in part of a systemNote 1 to entry: It is expressed in pascals (Pa) according to ISO 800001, in kilopascals (kPa) or in bar.4 Summary of the test methodTwo CCM units, using id
23、entical test screens, are connected to the water mains, one upstream and one downstream of the filter under test.Water at a flow rate of 10 l/min is passed through each CCM screen and the time required for each CCM to reach a predetermined pressure loss (0,5 bar) across its own screen is recorded.Th
24、e ratio between the two time periods, measured at the downstream and the upstream CCM units, is calculated. A ratio equal to or greater than five indicates that the filtration grade declared by the manufacturer is correct.5 CCM structure and operation5.1 ConstructionThe CCM device consists of two ma
25、in parts (see Figure 1).5.1.1 Sampler (1)The sampler is the part of the CCM through which water used for testing flows. It includes the following: screen housing (3), capable of being opened and closed for cleaning and for easy replacement of the filtering screen (4); flow rate regulator (5), accura
26、te to 2 %, limiting the flow rate to 10 l/min.5.1.2 Control unit (2)The control unit includes the following measuring instruments: pressure gauge (9) accurate to 1 %, measuring up to 10 bar; differential pressure gauge, digital or analog (10) accurate to 1 %; count up digital timer (6) with a resolu
27、tion of 0,01 min, preferably starting automatically when the pressure reaches a pre-determined level; timer start switch (12); timer reset button (11), setting the timer back to zero; tubes (7 and 8) connecting the control unit to the sampler. Pressure tap construction shall be in accordance with IS
28、O 9644.5.2 Mode of operation5.2.1 Insert a “sealed” screen, same as that used for testing but that is covered and sealed by a thin plastic film into the screen housing. Apply an inlet pressure of (1+0,2) bar. Make certain that no water is emerging from the CCM outlet.2 ISO 2015 All rights reservedBS
29、 ISO 18471:2015ISO 18471:2015(E)5.2.2 Replace the “sealed” screen with a CCM test screen, having filtration grade equal to that declared by the manufacturer of the filter under test.5.2.3 Set the timer to zero by pressing the reset button.5.2.4 To begin the test, open the water inlet to the sampler
30、and activate the timer start switch.1 40002468101240801201600barpsl21096111 1278534131415 16Key1 sampler 9 pressure gauge2 control unit 10 differential pressure gauge3 screen housing 11 timer reset button4 filtering screen 12 timer start switch5 flow rate regulator 13 water outflow6 count up digital
31、 timer 14 water inflow7 pressure tube 15 low pressure8 pressure tube 16 high pressureFigure 1 CCM schematic construction6 CCM test screen characteristicsThe screens used in the CCM shall be made of 316 stainless steel and have plain weave of square mesh with the characteristics specified in Table 1.
32、 ISO 2015 All rights reserved 3BS ISO 18471:2015ISO 18471:2015(E)Table 1 CCM test filter screens characteristicsAperture widtham (micron)Mesh countaapertures/inWire diameter mm60 250 0,0480 200 0,05100 140 0,08120 120 0,09140 100 0,11150 120 0,065165 105 0,076180 94 0,09200 88 0,09250 62 0,16300 50
33、0,20aIn case of a discrepancy between Aperture width and Mesh count data, the Aperture width takes precedence.7 ccuracy of measurements Pressure shall be measured with an accuracy of 1 %. Pressure loss shall be measured with an accuracy of 1 %, using a differential pressure gauge. Flow rate shall be
34、 measured with an accuracy of 2 %. At the beginning of the test (see 9.2), the flow rate shall not deviate by more than 2 % from the required flow rate. The difference in flow rate between the two CCM devices in the test system shall not exceed 4 %.8 Test system layoutPrepare the test system as per
35、Figure 2.4 ISO 2015 All rights reservedBS ISO 18471:2015ISO 18471:2015(E)16892134759RBRA5D10D1,5“1,5“Elbow 1,5“1“T 1“0,5“0,5“Ball valve1011Key1 pressure point data logger 7 connection union P.E. 322 filter to be tested 1” 8 ball valve 1”3 water meter 1” 9 water checkpoint CCM4 flow regulator 1” 10 w
36、ater inlet5 pressure reg. valve 1” 11 water outlet6 connection union P.E. 32 Figure 2 Test system layout9 Test procedure9.1 Adjust system inlet pressure to 4,0 bar, while water flow to the CCM units is blocked.9.2 Allow water to flow through the test system. Adjust the flow rate through the tested f
37、ilter to the mid-point of the flow rate range declared by the filter manufacturer. Then adjust the pressure at the system inlet to between 3,0 bar and 4,0 bar.9.3 Record the pressure upstream and downstream of the filter and calculate the pressure loss across the clean filter.9.4 Stop the water flow
38、 in the system. Replace the filter medium with a new, unused medium of the same type and characteristics.9.5 Resume water flow in the system and open the valves to both CCM units. ISO 2015 All rights reserved 5BS ISO 18471:2015ISO 18471:2015(E)9.6 Continuously monitor the increase in pressure loss a
39、cross the tested filter and across each CCM unit.9.7 Record the time required to reach a pressure loss of 0,5 bar in the upstream CCM (tup) and in the downstream CCM (tdown). Calculate and take note of the tdown/tupratio.9.8 Replace the screens at both CCMs.9.9 If the pressure loss across the test f
40、ilter exceeds the pressure loss recorded in the clean state by 0,5 bar (see 9.3), abort the test.9.10 Repeat 9.5 to 9.9 nine more times, then terminate the test.9.11 Calculate the average of all recorded tdown/tupratios. If the result is equal to or greater than five, the filtration grade declared b
41、y the manufacturer is correct.NOTE Consider the discontinuation of the test if a pressure loss of 0,5 bar is achieved in less than 30 s and if a pressure loss of 0,5 bar in the upstream CCM is not achieved within 60 min.6 ISO 2015 All rights reservedBS ISO 18471:2015ISO 18471:2015(E)Bibliography1 IS
42、O 9045:1990, Industrial screens and screening Vocabulary2 ISO 800001, Quantities and units Part 1: General ISO 2015 All rights reserved 7BS ISO 18471:2015ISO 18471:2015(E) ISO 2015 All rights reservedICS 65.060.35Price based on 7 pagesThis page deliberately left blankBSI is the national body respons
43、ible for preparing British Standards and other standards-related publications, information and services.BSI is incorporated by Royal Charter. British Standards and other standardization products are published by BSI Standards Limited.British Standards Institution (BSI)BSI Group Headquarters389 Chisw
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