BS ISO BRITISH STANDARD 9912-1:2004 Agricultural irrigation equipment Filters for micro-irrigation - Part l: Terms, definitions and classification ICS 65.060.35 BSi NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTL British Standards BS ISO 9912-1:2004 National foreword This British Standard reproduces verbatim IS0 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 responsibilityto: 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 European developments and promulgate them in the UK. 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 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 Standard does not ofitself confer immunity from legal obligations. 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 last issued. Amendments issued since publication This British Standard was published undertheauthority Amd. No. Date Comments of the Standards Policy and Strategy Committee on 14January 2005 @ BSI 14 January 2005 ISBN0580453650 BS ISO. 9912-1:2004 INTERNATIONAL ISO STANDARD 9912-1 First edition 2004-10-01 Agricultural irrigation equipment - Filters for micro-irrigation - Part 1: Terms, definitions and classification Materiel agricole d'irrigation Filtres pour micro-irrigation Partie 1:Termes, définitions et classification Reference number ISO 9912-1:2004(E) BS ISO 9912-1:2004 ii BS. ISO.9912-1:2004 Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies 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 International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. adopted by the technical committees are circulated to the member bodies for voting. Publication as an 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. ISO 9912-1 was prepared by Technical Committee ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee 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-cleaning strainer-type filters ii BS ISO 9912-1:2004 Introduction 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 of these. The effect of the clogging materials differs according to the water source (see Annex A for a list of irrigation water sources