1、BSI Standards Publication BS ISO 9912-2:2013 Agricultural irrigation equipment Filters for microirrigation Part 2: Strainer-type filters and disc filtersBS ISO 9912-2:2013 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 9912-2:2013. The UK participation in it
2、s preparation was entrusted to Technical Committee AGE/30, Irrigation and drainage equipment. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsi
3、ble for its correct application. The British Standards Institution 2013. Published by BSI Standards Limited 2013 ISBN 978 0 580 72961 4 ICS 65.060.35 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Stand
4、ards Policy and Strategy Committee on 30 November 2013. Amendments issued since publication Date Text affectedBS ISO 9912-2:2013 ISO 2013 Agricultural irrigation equipment Filters for microirrigation Part 2: Strainer-type filters and disc filters Matriel agricole dirrigation Filtres Partie 2: Filtre
5、s tamis INTERNATIONAL STANDARD ISO 9912-2 Second edition 2013-11-01 Reference number ISO 9912-2:2013(E)BS ISO 9912-2:2013ISO 9912-2:2013(E)ii ISO 2013 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2013 All rights reserved. Unless otherwise specified, no part of this publication may be reprodu
6、ced or utilized otherwise in any form 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.
7、ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in SwitzerlandBS ISO 9912-2:2013ISO 9912-2:2013(E) ISO 2013 All rights reserved iii Contents Page Foreword iv 1 Scope . 1 2 Normative references 1 3 T
8、erms and definitions . 1 4 Marking 3 4.1 General . 3 5 Design and construction requirements 4 5.1 General . 4 5.2 Filter housing . 4 5.3 Connections . 4 6 Mechanical and hydraulic tests . 5 6.1 General . 5 6.2 Resistance of the filter to internal hydrostatic pressure . 5 6.3 Filter element tightness
9、 and resistance to buckling or tearing 7 6.4 Clean pressure drop . 8 7 Information to be supplied by the manufacturer . 8 Bibliography .10BS ISO 9912-2:2013ISO 9912-2:2013(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
10、 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, gover
11、nmental 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 procedures used to develop this document and those intended for its further mainten
12、ance 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 rules of the ISO/IEC Directives, Part 2. www.iso.org/directives Attention i
13、s 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 identified during the development of the document will be in the Introduction and/o
14、r on the ISO list of patent declarations received. 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. The committee responsible for this document is ISO/TC 23, Tractors and machinery for agriculture and f
15、orestry, Subcommittee SC 18, Irrigation and drainage equipment and 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 fol
16、lowing URL: http:/www.iso.org/iso/home/standards_development/resources-for- technical-work/foreword.htm This 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 Agricultur
17、al irrigation equipment Filters for microirrigation: Part 1: Terms, definitions and classification Part 2: Strainer-type filters and disc filters Part 3: Automatic flushing strainer-type filters and disc filters A fourth part on granulated media filters is planned.iv ISO 2013 All rights reservedBS I
18、SO 9912-2:2013INTERNATIONAL ST ANDARD ISO 9912-2:2013(E) Agricultural irrigation equipment Filters for microirrigation Part 2: Strainer-type filters and disc filters 1 Scope This part of ISO 9912 specifies general construction requirements and test methods for strainer filters and disc filters (here
19、inafter called filters) intended for operation in agricultural irrigation 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 st
20、ructural requirements or tests of automatic flushing mechanism filters that 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
21、various filters under identical operating conditions will be described in that 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 references The following docum
22、ents, 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 7-1, Pipe threads wher
23、e pressure-tight joints are made on the threads Part 1: Dimensions, tolerances and designation ISO 7005-1, Pipe flanges Part 1: Steel flanges for industrial and general service piping systems ISO 7005-2, Metallic flanges Part 2: Cast iron flanges ISO 9912-1:2004, Agricultural irrigation equipment Fi
24、lters for micro-irrigation Part 1: Terms, definitions and classification 3 Terms and definitions For the purposes of this document, the terms and definitions in ISO 9912-1 and the following apply. 3.1 strainer filter strainer device containing one or more filter elements, such as a screen or a mesh,
25、 used for separating clogging material from water flowing through the device by collecting it on the surface of the filter element or elements SOURCE: ISO 9912-1:2004, 2.8 3.2 disc filter filter in which the filter element is a disc filter element Note 1 to entry: See also 3.4. ISO 2013 All rights r
26、eserved 1BS ISO 9912-2:2013ISO 9912-2:2013(E) 3.3 strainer filter element filter element component 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
27、 component SOURCE: ISO 9912-1:2004, 2.25 3.4 disc filter element filter element component of a filter composed of discs with grooved or textured faces arranged adjacent to the other to form a stack 3.5 filter housing component of a filter that houses or supports the filter element SOURCE: ISO 9912-1
28、:2004, 2.34 3.6 filter housing cover removable cover permitting assembly, disassembly, inspection, and cleaning of the filter elements 3.7 drain valve flush valve valve normally installed at the bottom of a filter, intended for draining or flushing of contaminate from the filter housing 3.8 nominal
29、pressure p nom numerical designation equal to the maximum working pressure specified by the manufacturer at which a device will operate at a water temperature of 23 C 3 C 3.9 clean pressure drop pressure drop in a clean filter, measured with a flow of clean water 3.10 safe maximum pressure drop maxi
30、mum allowable pressure difference, declared by the manufacturer, between inlet and outlet pressures across a filter, when the filter element has become clogged to the extent of requiring cleaning or replacement 3.11 critical pressure drop before failure maximum allowable pressure difference, declare
31、d by the manufacturer, between inlet and outlet pressures across each filtering element of the filter, which will not cause failure of the filter element 3.12 range of recommended flow rates range of flow rates, declared by the manufacturer, for proper operation of a filter 3.13 nominal size numeric
32、al designation used to refer to the size of the device end connection which is identical to the numerical designation of the pipe or pipes to which the device is to be connected directly2 ISO 2013 All rights reservedBS ISO 9912-2:2013ISO 9912-2:2013(E) 3.14 aperture size size, declared by the manufa
33、cturer, that expresses the ability of a filter to retain particles and suspended matter Note 1 to entry: The aperture size is expressed in microns. 3.15 filter connection length overall length between the extremities of the connections of a filter, the face-to-face distance between the connections,
34、or the distance between centre-lines of the parallel inlet and outlet ports 3.16 contaminate debris, suspended particles of organic or inorganic origin, or other contaminants removed from water in the filtration process SOURCE: ISO 9912-1:2004, 2.9 4 Marking 4.1 General Each filter shall bear a read
35、ily visible, durable marking giving the particulars specified in 4.1.1 and 4.1.2. 4.1.1 Marking of filter housing The marking of the filter housing shall include: a) the name of manufacturer and/or registered trademark, b) the model identification, c) the nominal size, d) the nominal pressure, e) an
36、 arrow indicating the direction of water flow, and f) the aperture size (optional marking, applicable when a filter is supplied with the filter element already 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 fil
37、ter element The marking of the filter element shall include: a) the name of manufacturer and/or registered trademark, and b) the aperture size. The aperture size may be indicated by a marking such as a specific colour that is defined in the manufacturers catalogue. ISO 2013 All rights reserved 3BS I
38、SO 9912-2:2013ISO 9912-2:2013(E) 5 Design and construction requirements 5.1 General Filter parts that are in contact with water shall be made of non-toxic materials and shall be resistant to, or protected against, corrosion and other forms of degradation caused by existing working conditions and typ
39、es of water and chemicals used in agricultural irrigation. The filter housing shall be resistant to environmental conditions. Components belonging to filters of the same size, type, and model, and produced by the same manufacturer, shall be interchangeable. Plastics parts of a filter that are expose
40、d to ultraviolet (UV) radiation under normal working conditions in which the filter operates shall include additives to improve their resistance to UV radiation. Plastics parts that enclose waterways shall be opaque or shall be provided with an opaque cover that blocks all light from reaching clear
41、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, after the assembly of the filter element in the filter housing, all the water flowing through the filter flows through the filter
42、element. 5.2 Filter housing Where the size or the configuration of a thread-connected filter housing does not allow for easy handling of it while connecting or disconnecting pipework, a boss or other means for facilitating connection and disconnection of the filter housing to and from the network sh
43、all 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 replacing the filter element. In a manually cleaned filter, the construction of the filter element shall allow the disassembly,
44、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 in the manufacturers catalogue by more than the tolerance specified in Table 1. Table 1 Filter length tolerance Dimensions in mi
45、llimetres Length of filter Permissible deviation a 400 2 400 3 aThe length tolerance is only applicable to filter housings where the axes of inlet and outlet ports are parallel. 5.3 Connections 5.3.1 Threads of a filter with threaded ends for direct connection to the supply line shall comply with IS
46、O 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 shall comply with ISO 7005-1 or ISO 7005-2, depending on the material from which the filter housing connection is made. 5.
47、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 standard 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 suita
48、ble connection, such as a thread or a mechanical grooved connection (Victaulic 1) , for example), shall be provided on the drain valve outlet to facilitate the connection of components to provide for drainage. 6 Mechanical and hydraulic tests 6.1 General Perform the following tests with water at a t
49、emperature 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 of 2 % of actual values. 6.2 Resistance of the filter to internal hydrostatic pressure 6.2.1 Preparation Perform 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. Clos
