### Calculations for Screw conveyors Bechtel GmbH

Calculations for screw conveyors Capacity in m2 per hour (Q) Q = 47,1 x ( D2 d2 ) s x n x i Capacity in kg per hour (Q) Q = 47,1 x ( D2 d2 ) s n x i sg D = screw outside diameter in dm d = screw inner diameter in dm s = pitch in dm n = rotations per minute sg = speciﬁ c weight of the material (see table) i = degree of trough ﬁ lling (eg. 30%: i=0,3)