1、BRITISH STANDARD BS ISO 9912-1:2004 Agricultural irrigation equipment Filters for micro-irrigation Part 1: Terms, definitions and classification ICS 65.060.35 BS ISO 9912-1:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 14 January 2005
2、BSI 14 January 2005 ISBN 0 580 45365 0 National foreword This British Standard reproduces verbatim ISO 9912-1:2004 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee AGE/30, Irrigation and drainage equipment, which has the resp
3、onsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International
4、 Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British St
5、andard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and Euro
6、pean developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to iv, pages 1 to 8, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was
7、 last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 9912-1:2004(E)INTERNATIONAL ADNATSDR ISO 9-2191 tide tsriFino -400210-01 Agricultural irrigation equipment Filters for micro-irrigation Part 1: Terms, definitions and classification Matriel agricole dirriga
8、tion Filtres pour micro-irrigation Partie 1: Termes, dfinitions et classification Referecne unbmer OSI 1-2199:002)E(4 OSI 4002INTERNATIONAL STANDARD ISO 9912-1 First edition 2004-10-01 Agriluctirri laruitage noiuqempn t orcim rof sretliF-itagirri no :1 traP ,smreT ifeditinonna sssalc dcifioitan rtaM
9、ile rgaciole ridritagnoi F irtles opru micr-oriritagnoi raPtie :1 Termse, fdinitoins c telsasificaitno BSISO99121:2004 ii BSISO99121:2004 iiiForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of prepa
10、ring 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, governmental and non-governmental, in l
11、iaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task o
12、f technical committees is to prepare International Standards. 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. 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. ISO 9912-1 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, S
14、ubcommittee SC 18, Irrigation and drainage equipment and systems. ISO 9912 consists of the following parts, under the general title Agricultural irrigation equipment Filters for micro-irrigation: Part 1:Terms, definitions and classification Part 2: Strainer-type filters Part 3: Automatic self-cleani
15、ng strainer-type filters BSISO99121:2004iv Introduction Clogging of irrigation system components and, in particular, of drip emitters, is one of the main problems encountered in micro-irrigation. Materials causing clogging include debris, suspended particles of organic and inorganic origin (sand, si
16、lt, clay, plastics, algae and water-borne insects), chemical deposits (calcium carbonate and magnesium carbonate, calcium sulphate, metal oxides and metal hydroxides) and biological suspensions (slime secretions and fibres). Severe clogging problems are often the result of a combination of a number
17、of these. The effect of the clogging materials differs according to the water source (see Annex A for a list of irrigation water sources). With surface water supplies, water quality may also vary from one season to another and with chemical injection. In addition, clogging hazards depend on the oper
18、ating conditions, pumping regime, irrigation system and chemical injection program. The function of the filter in an irrigation system is to remove materials from the water that can clog or otherwise foul the various components of the system. However, under typical irrigation conditions, and in view
19、 of the wide range of size and hardness of suspended particles in irrigation water, complete removal of all suspended particles cannot be expected. Moreover, under conditions of alkaline or hard water when accompanied by conditions of high biological activity and/or high suspended organic particle c
20、ontent, the materials passing through the filter are liable to coalesce in the piping system and/or in the emitters and to cause clogging. Hence, depending on the water quality, it could be necessary to use two or more filters in series in different parts of the system to minimize clogging. Under co
21、nditions of problematic water and high filtration efficiency, clogging of the filters themselves may prove to be the main problem and completion of an irrigation set may be impeded due to the need for their frequent cleaning. Various operating methods, using either absorption or separation, are empl
22、oyed in order to separate and/or remove clogging materials from irrigation water. In turn, separation can be by means of surface separation (gravity surface separation, pressurized surface separation or self-circulating separation), centrifugal separation, entrapment or interception. BSISO99121:2004
23、INTENRATIONAL TSANDADR IS-2199 O1:(4002E)1Agricultural irrigation equipment Filters for micro-irrigation Part 1: Terms, definitions and classification 1 Scope This part of ISO 9912 defines terms used in relation to filters intended for agricultural micro-irrigation systems in particular, pressurized
24、 systems and provides a means of classifying those filters according to filtration method, structure, operating principle and function. It does not deal with classification according to the type of water intended to be filtered; nor does it apply to the classification of filters for potable or domes
25、tic water use. 2 Terms and definitions For the purposes of this document, the following terms and definitions apply. 2.1 filtration process employing a permeable medium and/or spinning component to separate, from water, materials that would clog an irrigation system, also employing a means for remov
26、ing those materials from the permeable medium or spinning component such that the capacity of the medium or component to separate the materials is renewed 2.2 pre-filtration process for separating primarily large particles from water to be filtered with the object of reducing the clogging of the fil
27、ter elements and, consequently, the head loss across the filter elements 2.3 interception method of removing suspended particles from water, by gravity, employing gravel partitions between reservoir basins to separate the suspended particles from the water 2.4 surface separation method of unpressuri
28、zed separation that depends on gravity and employs an inclined separating element, such as a screen, mesh or strainer, to separate suspended particles and larger clogging material from the water 2.5 centrifugal separation method of separation that separates, from water, clogging material heavier tha
29、n water and that employs a spinning technique using centrifugal forces exerted by the filtered water, as in a hydrocyclone BSISO99121:20042 2.6 entrapment method of filtration in which clogging material is captured within the interior of a three-dimensional filter medium 2.7 self-circulating separat
30、ion method of filtration that employs a screen, or any other suitable filter medium, and a spinning technique used with or without flow adjustment, for separating clogging materials from water 2.8 strainer-type filter strainer device containing one or more filter elements, such as a screen or mesh,
31、used for separating clogging materials from water flowing through the device by collecting it on the surface of the filter element, or elements 2.9 filtrate debris, suspended particles of organic or inorganic origin, or other contaminants removed from water in the filtration process 2.10 flushing me
32、thod of removing clogging material from a filter using water without removal of the filter element or, following removal of the element, by manually removing clogging material from the filter element using water 2.11 back flushing reverse flushing method of removing filtrates from a filter by passin
33、g filtered water through the filter medium or over the surface of the filter element, in a direction opposite to the normal flow of water, to remove accumulated, trapped or separated filtrates from the filter, without disassembling the filter 2.12 continuous flushing method of removing clogging mate
34、rial from a filter element by controlled continuous flow of purge water 2.13 through flushing flushing by means of high-velocity, high-pressure flow through a discharge valve or outlet used for filters especially designed for this type of flushing 2.14 simultaneous back flushing flushing occurring s
35、imultaneously through all areas of the filter element or through all the individual elements of a multi-element filter 2.15 sequential back flushing back flushing of one or more individual filter elements functioning in parallel after their removal from service for back flushing, frequently using fi
36、ltered water from some or all of the remaining filter elements 2.16 directed jet flushing flushing that employs a high-velocity stream of clean water directed at a portion of the area of a filter element on the downstream side of the filter, thus causing a localized reverse flow that flushes the fil
37、trate from a portion of the filter element, and which then moves over the entire area of the element to progressively back flush all of it BSISO99121:2004 32.17 disposable element filter filter that cannot be flushed or cleaned from which clogging material is removed when the filter element is repla
38、ced 2.18 automatic flushing filter filter in which both the initiation and the termination of discrete flushing cycles are activated automatically by different means (pressure drop, time, volume of water passing through the filter, etc.) 2.19 semi-automatic flushing filter filter in which the flushi
39、ng sequence or cycle is manually activated, followed by automatic termination of flushing, generally by means of time or volume of flushing water 2.20 manual flushing filter filter constructed so that manual opening of a valve causes a discharge appropriately oriented and of sufficient volume and ve
40、locity to flush the filter without disassembly 2.21 manually cleaned filter filter that must be disassembled and manually washed using water to remove filtrates from the filter element 2.22 disc filter filter in which the filter element is composed of discs with grooved or textured surfaces arranged
41、 one on top of the other to form a stack, creating a porous space between adjacent discs within which the filtrate is trapped or deposited 2.23 cartridge filter filter using a media filter element held together as a single replaceable component of the filter for cleaning purposes 2.24 filter element
42、 component or assembly that embodies or holds together the filter medium or surface separation device that removes the filtrates from water by entrapment or separation 2.25 strainer filter element component of a strainer-type filter consisting of a perforated plate, screen, mesh, or a combination of
43、 these, intended to retain clogging materials larger than a specified size from the water flowing through the component 2.26 media filter element depth filter element component, housing or assembly containing a three-dimensional filter medium such as sand, gravel, textile, fibres or a porous mass of
44、 bonded particles, employing entrapment as a method of filtration 2.27 filter medium porous permeable material employed in filtration within which the filtrate is trapped or deposited 2.28 pressurized filter filter designed for operation with an inlet pressure greater than atmospheric pressure BSISO
45、99121:20044 2.29 gravity filter filter that does not employ pressure or a vacuum to produce a high differential pressure but in which the driving force for filtration is provided solely by the elevation of the free surface of water contained in the filter above the filter medium 2.30 vacuum filter f
46、ilter designed for operation in which the discharge side of the filter is below atmospheric pressure, as on the suction side of a pump 2.31 hydrocyclone device in which clogging material is separated from water by a centrifugal force resulting from rotation of the water, generally by introducing the
47、 water so that it flows in a tight vortex and the clogging material is thrown to the walls, causing the bulk of the water to exit from the chamber at the centre of the vortex and the clogging material and the rest of the water to exit from the chamber through its apex or bottom 2.32 in-line filter c
48、o-axial filter filter for which the inlet and the outlet are coaxial 2.33 on-line filter non-coaxial filter filter in which the inlet and the outlet are not coaxial 2.34 filter housing component of a filter that houses or supports the filter medium 2.35 media filter depth filter filter in which clog
49、ging material is trapped within the interior of a three-dimensional filter medium, such as sand, gravel, textile, fibres or a porous mass of bonded particles 2.36 sand filter media filter in which the filter medium consists of sand, gravel or other natural or synthetic particles, in some cases employing layers of the filter medium, each of a different particle size 2.37 nominal flow rate of filtration flow rate through a filter for proper filtration, as de
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