STEP 2 : Refer to Table C and identify the various combinations of feeder widths and slopes available for the desired capacity. Disregard any that are smaller in width than the minimum feeder width calculated in Step 1. It may become necessary to increase the minimum feeder width to obtain desired capacity. If so, disregard minimum width from Step 1 and substitute with the revised minimum feeder width for the desired capacity as shown in Table C.

STEP 3 : Now consider feeder length. Usually the size and positioning of companion equipment such as crushers, conveyors, aprons, hoppers, chutes, etc. suggest the given to minimum feeder pan length. Thepan can also be no shorter than that which is needed to retain the material at its angle of repose on the pan after the feeder has been shut down.Determine minimum pan length by referring to Sketch B. Make your own scaled diagram to show slope of feeder and the angle of repose of the material on the pan at rest. Allow for the proper hopper throat opening (from Step 1) when using a four-sided hopper. Add 12" (30 cm) to the pan length as a safety factor to prevent the material from continuing to flow freely. Then add the length of any required grizzly sections to the minimum pan length to determine the minimum feeder length.

STEP 4 : Again evaluate width, slopes and capacities shown in Table C. Consider feeder length and headroom requirements. Match these with location, elevations and critical dimensions of companion equipment. Remember to allow for future capacity increase demands. Now select the width/slope combination that meets desired capacity and which is best suited to your particular application and installation peculiarities. You may want to go narrower and steeper to match up with a crusher opening; perhaps wider to accept feed from an existing apron conveyor. Or, you may have to go wider with less slope to accommodate elevation limitations. You are likely to discover that although more than one size feeder will satisfy your capacity requirements, one particular width/slope/length combination best serves your specific needs.