1、BSI Standards PublicationBS ISO 9912-2:2013Agricultural irrigationequipment Filters formicroirrigationPart 2: Strainer-type filters and disc filtersBS ISO 9912-2:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 9912-2:2013.The UK participation in its prepar
2、ation was entrusted to TechnicalCommittee 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 c
3、orrectapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 72961 4ICS 65.060.35Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strat
4、egy Committee on 30 November 2013.Amendments issued since publicationDate Text affectedBS ISO 9912-2:2013 ISO 2013Agricultural irrigation equipment Filters for microirrigation Part 2: Strainer-type filters and disc filtersMatriel agricole dirrigation Filtres Partie 2: Filtres tamisINTERNATIONAL STAN
5、DARDISO9912-2Second edition2013-11-01Reference numberISO 9912-2:2013(E)BS ISO 9912-2:2013ISO 9912-2:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2013All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any f
6、orm or by any means, 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 officeCase postale 56
7、 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 9912-2:2013ISO 9912-2:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Marking 34.1 General
8、 . 35 Design and construction requirements 45.1 General . 45.2 Filter housing . 45.3 Connections . 46 Mechanical and hydraulic tests . 56.1 General . 56.2 Resistance of the filter to internal hydrostatic pressure . 56.3 Filter element tightness and resistance to buckling or tearing 76.4 Clean pressu
9、re drop . 87 Information to be supplied by the manufacturer . 8Bibliography .10BS ISO 9912-2:2013ISO 9912-2:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standard
10、s 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
11、part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In parti
12、cular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention is drawn to the possibility that some of the elements of this do
13、cument 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 identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/
14、patentsAny trade name used in this document is information given for the convenience of users and does not constitute an endorsement.The committee responsible for this document is ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 18, Irrigation and drainage equipment an
15、d systems.For an explanation 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: http:/www.iso.org/iso/home/standards_development/resou
16、rces-for-technical-work/foreword.htmThis second edition cancels and replaces the first edition (ISO 9912-2:1992), of which it constitutes a minor revision.ISO 9912 consists of the following parts, under the general title Agricultural irrigation equipment Filters for microirrigation: Part 1: Terms, d
17、efinitions and classification Part 2: Strainer-type filters and disc filters Part 3: Automatic flushing strainer-type filters and disc filtersA fourth part on granulated media filters is planned.iv ISO 2013 All rights reservedBS ISO 9912-2:2013INTERNATIONAL STANDARD ISO 9912-2:2013(E)Agricultural ir
18、rigation equipment Filters for microirrigation Part 2: Strainer-type filters and disc filters1 ScopeThis part of ISO 9912 specifies general construction requirements and test methods for strainer filters and disc filters (hereinafter called filters) intended for operation in agricultural irrigation
19、systems.This part of ISO 9912 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
20、 are covered by ISO 9912-3.NOTE The parameters of filtration ability, efficiency, and capacity, their definitions, and their test methods are to be included in a separate ISO Technical Report. The test methods for comparing various filters under identical operating conditions will be described in th
21、at Technical Report, using water as defined by the client, to characterize the filter properties during operation with this water, or with water defined by the tester or the client.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are
22、 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 7-1, Pipe threads where pressure-tight joints are made on the threads Part 1: Dimensions, tolerances
23、and designationISO 7005-1, Pipe flanges Part 1: Steel flanges for industrial and general service piping systemsISO 7005-2, Metallic flanges Part 2: Cast iron flangesISO 9912-1:2004, Agricultural irrigation equipment Filters for micro-irrigation Part 1: Terms, definitions and classification3 Terms an
24、d definitionsFor the purposes of this document, the terms and definitions in ISO 9912-1 and the following apply.3.1strainer filterstrainerdevice containing one or more filter elements, such as a screen or a mesh, used for separating clogging material from water flowing through the device by collecti
25、ng it on the surface of the filter element or elementsSOURCE: ISO 9912-1:2004, 2.83.2disc filterfilter in which the filter element is a disc filter elementNote 1 to entry: See also 3.4. ISO 2013 All rights reserved 1BS ISO 9912-2:2013ISO 9912-2:2013(E)3.3strainer filter elementfilter elementcomponen
26、t of a strainer filter consisting of a perforated plate, a screen, a mesh, or a combination of these, intended to retain clogging materials larger than a specified size from the water flowing through the componentSOURCE: ISO 9912-1:2004, 2.253.4disc filter elementfilter elementcomponent of a filter
27、composed of discs with grooved or textured faces arranged adjacent to the other to form a stack3.5filter housingcomponent of a filter that houses or supports the filter elementSOURCE: ISO 9912-1:2004, 2.343.6filter housing coverremovable cover permitting assembly, disassembly, inspection, and cleani
28、ng of the filter elements3.7drain valveflush valvevalve normally installed at the bottom of a filter, intended for draining or flushing of contaminate from the filter housing3.8nominal pressurepnomnumerical designation equal to the maximum working pressure specified by the manufacturer at which a de
29、vice will operate at a water temperature of 23 C 3 C3.9clean pressure droppressure drop in a clean filter, measured with a flow of clean water3.10safe maximum pressure dropmaximum allowable pressure difference, declared by the manufacturer, between inlet and outlet pressures across a filter, when th
30、e filter element has become clogged to the extent of requiring cleaning or replacement3.11critical pressure drop before failuremaximum allowable pressure difference, declared by the manufacturer, between inlet and outlet pressures across each filtering element of the filter, which will not cause fai
31、lure of the filter element3.12range of recommended flow ratesrange of flow rates, declared by the manufacturer, for proper operation of a filter3.13nominal sizenumerical designation used to refer to the size of the device end connection which is identical to the numerical designation of the pipe or
32、pipes to which the device is to be connected directly2 ISO 2013 All rights reservedBS ISO 9912-2:2013ISO 9912-2:2013(E)3.14aperture sizesize, declared by the manufacturer, that expresses the ability of a filter to retain particles and suspended matterNote 1 to entry: The aperture size is expressed i
33、n microns.3.15filter connection lengthoverall length between the extremities of the connections of a filter, the face-to-face distance between the connections, or the distance between centre-lines of the parallel inlet and outlet ports3.16contaminatedebris, suspended particles of organic or inorgani
34、c origin, or other contaminants removed from water in the filtration processSOURCE: ISO 9912-1:2004, 2.94 Marking4.1 GeneralEach filter shall bear a readily visible, durable marking giving the particulars specified in 4.1.1 and 4.1.2.4.1.1 Marking of filter housingThe marking of the filter housing s
35、hall include:a) the name of manufacturer and/or registered trademark,b) the model identification,c) the nominal size,d) the nominal pressure,e) an arrow indicating the direction of water flow, andf) the aperture size (optional marking, applicable when a filter is supplied with the filter element alr
36、eady assembled).The aperture size may be marked on an adhesive label affixed to the filter housing in a prominent position.4.1.2 Marking of filter elementThe marking of the filter element shall include:a) the name of manufacturer and/or registered trademark, andb) the aperture size.The aperture size
37、 may be indicated by a marking such as a specific colour that is defined in the manufacturers catalogue. ISO 2013 All rights reserved 3BS ISO 9912-2:2013ISO 9912-2:2013(E)5 Design and construction requirements5.1 GeneralFilter parts that are in contact with water shall be made of non-toxic materials
38、 and shall be resistant to, or protected against, corrosion and other forms of degradation caused by existing working conditions and types of water and chemicals used in agricultural irrigation. The filter housing shall be resistant to environmental conditions.Components belonging to filters of the
39、same size, type, and model, and produced by the same manufacturer, shall be interchangeable.Plastics parts of a filter that are exposed to ultraviolet (UV) radiation under normal working conditions in which the filter operates shall include additives to improve their resistance to UV radiation. Plas
40、tics parts that enclose waterways shall be opaque or shall be provided with an opaque cover that blocks all light from reaching clear waterway enclosures.The construction of the filter shall facilitate its proper installation in its intended location and position.The filter shall be designed so that
41、, after the assembly of the filter element in the filter housing, all the water flowing through the filter flows through the filter element.5.2 Filter housingWhere the size or the configuration of a thread-connected filter housing does not allow for easy handling of it while connecting or disconnect
42、ing pipework, a boss or other means for facilitating connection and disconnection of the filter housing to and from the network shall be provided.The filter shall be designed so that contaminates accumulated on the filter element or in the filter housing do not enter the supply line when cleaning or
43、 replacing the filter element. In a manually cleaned filter, the construction of the filter element shall allow the disassembly, cleaning, and reassembly of the filter element without removal of the filter from the supply line.The filter connection length shall not deviate from the length indicated
44、in the manufacturers catalogue by more than the tolerance specified in Table 1.Table 1 Filter length toleranceDimensions in millimetresLength of filter Permissible deviationa400 2400 3aThe length tolerance is only applicable to filter housings where the axes of inlet and outlet ports are parallel.5.
45、3 Connections5.3.1 Threads of a filter with threaded ends for direct connection to the supply line shall comply with ISO 7-1. Other types of threads are allowed provided that a suitable adaptor is supplied with each threaded connection, so that it complies with ISO 7-1.5.3.2 Flanged connections shal
46、l comply with ISO 7005-1 or ISO 7005-2, depending on the material from which the filter housing connection is made.5.3.3 For filters with other types of connections, the filter manufacturer shall supply or identify a commercially available adaptor to a standard thread as described in 5.3.1 or to a s
47、tandard flange as described in 5.3.2.4 ISO 2013 All rights reservedBS ISO 9912-2:2013ISO 9912-2:2013(E)5.3.4 A suitable connection, such as a thread or a mechanical grooved connection (Victaulic1), for example), shall be provided on the drain valve outlet to facilitate the connection of components t
48、o provide for drainage.6 Mechanical and hydraulic tests6.1 GeneralPerform the following tests with water at a temperature of 23 C 3 C, unless otherwise indicated in the specific test description.Ensure that the instruments used for measuring the various parameters permit measurement to an accuracy o
49、f 2 % of actual values.6.2 Resistance of the filter to internal hydrostatic pressure6.2.1 PreparationPerform the following tests on a filter with all its parts assembled for normal operation, according to the manufacturers instructions.Sample size should be determined by the tester or by the client.Close the filter housing cover according to the manufacturers instructions, including the required closure force or moment. If a specific tool is required for the closing, it shall be supplied by the manufact
