Sep 24, 2018 Attachment I Typical design calculation for an . 410 Attachment I Typical design calculation for an agricultural biogas plant Silo conveyors Two screw conveyors in series with nominal capacity 3V SC 1/mh each and motor capacity P SC 5 kW each are driven between silo and preparation tank twice a day for t SC 1 h/d. Belt Conveyors for Bulk Materials Calculations by CEMA 5 Edition. Belt Conveyor Capacity Table 1. Determine the surcharge angle of the material. The surcharge angle, on the average, will be 5 degrees to 15 degrees less than the angle of repose.