ISO INTERNATIONAL STANDARD 3684 Second edition 1990-03-15 ANsI Infernat Doc Sect Conveyors belts -- Determination of minimum pulley diameters Courroies transporteuses -Determination des diametres minimaux des tambours Reference number ISO 3684 :1990 (E) Coovriaht International Oraanization for Standardizatior ISO3684:1990 (E) Foreword ISo (the International Organization for 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 right to be represented on that committee. International organizations, govern- mental 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 electrotcchnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISo Council. They are approved in accordance with IsO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO3684 was prepared by Technical Committee ISO/TC 41, Pulleys and belts (including veebelts). This second edition cancels and replaces the first edition (IS0 3684:1976), of which it constitutes a technical revision. ? ISO 1990 Al rights reserved.No partof this publication may be reproducedorutilized in anyform or by any writing from the publisher. International Organization for Standardization Casepostale56.CH-1211Geneve20.Switzerland Printed in Switzerland Coovriaht Intermational Oraanization for Standardizatiot ISO3684:1990(E) INTERNATIONALSTANDARD Conveyor belts - Determination of minimum pulley diameters 1 Scope agreements based on this international Standard are encouraged to investigate the possibility of applying the most recent editions This international Standard establishes a method of calculating of the standards indicated below. Members of IEC and ISO main- minimum pulley diameters for conveyor belts. tain registers of currently valid International Standards. It applies to belts made of rubber or plastics with textile or ISo3:1973,Preferrednumbers-Seriesofpreferrednumbers. metal carcasses, of different carcass thickness and different carcass materials, operating at any anticipated belt tension up ISO583:1975,Conveyorbelts-Tolerancesontotalthickness to, but not exceeding, the maximum belt tension (RMBT). and thicknessof covers. It does not apply eitherto belts which have a carcass thickness ISo 1536:1975,Continuous mechanical handling equipment of more than 20 mm or to those which have intermediate layers forloose bulk materials --Troughed belt conveyors (other than of rubber or plastics of more than 0,8 mm thickness between portableconveyors)Belts. the plies. ISo7590:1988,Steelcordconveyorbelts Coverthickness Nor does it apply either to heat-resistant belts on conveyors for measurement. hot products at temperatures over100oC orto belts in service at ambient temperatures under -40 °C. 3 Definitions The use on conveyorbelts of pulleys with diameters too small for the carcass construction may lead to premature belt failure. 3.1 Belt structure NOTES The values indicated in this International Standard are minimum 3.1.1 thickness of fabric carcass,h2:as defined by ISO 583. values tobe used in the absenceof informationprovided bythe con- veyor belt manufacturer The calculation of the minimum pulley diameter according to this 3.1.2 thickness of steel cord carcass, d2: as defined by International Standard is valid for all general applications. For special ISO7590. purposes, the conveyor belt manufacturer may allow smaller pulley diameters.Forbelts whicharenotlisted inthefollowingtables,consuit 3.2 Typesofpulley the manufacturer. In the case of use of pulley