2019-3-20 · TPH at 40 rpm (100 pcf bulk density) 4 1.5 3 6 4 9 9 16 33 10 22 44 12 37 74 14 61 122 16 92 185 18 133 267 20 183 365 24 320 640 Fig. 2: Stepped Shaft Diameter Mass Flow Screw Stepped Diameter Shaft & Constant Pitch (Feed Section) Constant …