Construction and Maintenance of Belt Conveyors for Coal ...
5 Construction and Maintenance of Belt Conveyors for Coal and Bulk Material Handling Plants Hence, average lump size of sized bulk material = (a max + a min) / 2 Sized materials are adequately defined by the values a max and a min. Unsized materials, however, require, in most cases, a complete sieve analysis in which the ratio of the lump size shall not exceed .