Rock Products

JUL 2015

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34 • ROCK products • July 2015 EQUIPMENT & TECHNOLOGY MATERIAL HANDLING & CONVEYING T he Conveyor Equipment Manufac- turers' Association (CEMA) has issued a new standard for the ranking of conveyor belt cleaners, a long-await- ed publication that provides perfor- mance-based guidelines for specifying belt cleaners by establishing a specific formula for determining the level of dif- ficulty in a given application. The new standard is included in the 7 th edition of the CEMA book, "Belt Con- veyors for Bulk Materials," in the sec- tion on belt cleaning. Uniform Method According to the organization's web- site, "The Classification of Applications for Bulk Material Conveyor Belt Clean- ing" was established to provide a uni- form method for determining the ap- plication class of any belt conveyor. "For end users, the standard is an ob- jective means of determining a clean- er's suitability for the plant's material and operating conditions, allowing them to specify a cleaner most likely to meet their needs," explained Prod- uct Engineer Daniel Marshall from Martin Engineering. "It also provides a means to check a sales rep's recom- mendations against the application re- quirements, allowing users to compare 'apples and apples' in terms of duty rating, performance and pricing." Manufacturers voluntarily specify into which class their particular designs fall. Conveyor engineers are also expected to benefit from the new standard, as they can now specify a belt cleaner rat- ing without relying on a manufacturer's proprietary technical information. "An objective method to determine cleaner suitability helps designers by allowing them to specify a cleaner based on its performance and durability," Marshall continued. "Now subjectivity can es- sentially be removed from the cleaner purchasing decision to concentrate on system performance." For belt cleaner manufacturers, CEMA 576 is a way to confirm that a cleaner matches the application requirements, and thereby assure customer satisfaction. "Suppliers can now include a clear ranking on data sheets and other literature, allowing customers to review and compare products," Marshall observed. How It Works The standard uses belt features and material characteristics to develop its ratings, using CEMA Standard 550 to assign values for the material cat- egories. The factors include the con- veyor speed, belt width and splices, as well as the material's abrasive- ness and moisture content. Each is scored individually and then to- taled to arrive at the class rating for the application. The final score is divided into five application (class) levels and should be specified when cleaners are being selected. Appro- priate cleaners should have a rating that meets or exceeds the calculated application class score. "Specifiers of a belt cleaner need to consider the environment in which it operates," Marshall continued. "Sev- eral factors will play significant roles in deciding the appropriate selection, and this standard provides a way to condense a complex operating envi- ronment into a single classification number." Martin Engineering participated in development of the new standard, contributing expertise gained from 75 years solving problems in bulk materi- als handling. The company has collab- orated with CEMA in many capacities, with personnel serving in roles such as president, vice president, secretary and treasurer, as well as officers and chairs of numerous standards-writing committees. Retired CEO and Chief Technical Officer Todd Swinderman (currently a consultant to Martin Engi- neering) also served as chair and edi- tor of the 6 th edition of the CEMA Belt Book, "Belt Conveyors for Bulk Materi- als," in addition to editing the recently released 7 th edition. CEMA has been the voice of the con- veyor industry since 1933, a trade association serving North American designers, manufacturers and users of conveyors and components. The orga- nization is focused on voluntary adher- ence to design standards, safety, manu- facturing and applications to promote the growth of the conveyor industry and the advancement of material handling technology. Membership is comprised of leading manufacturers of conveying systems who design, pro- duce and install all types of conveying machinery, including belt, chain, screw and roller conveyors, as well as bucket elevators. CEMA provides the industry with standards, technical information, safety labels and safety information from meetings where members de- velop and discuss industry standards, technical publications and new devel- opments in conveyor design, technolo- gy, application and safety. Information for this article supplied by Martin Engineering. CEMA 576: Classification for Conveyor Belt Cleaners

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