The selection of bin dischargers remains a rather empirical exercise. Generally, the choice relies heavily on previous experiences. Extrapolation from the behaviour of a bulk solid which has been handled before to predict the behaviour another bulk solid for which there is no prior experience, is still common-place; such extrapolations can be very dangerous. Erroneous conclusions and poorly performing equipment often result. Traditional flow properties determined to aid in the design of bins, feeders and chutes can also be used with some confidence, to aid in the selection of bin dischargers. This paper explores the application of flow properties as an aid in selecting dischargers which rely on vibration or aeration to ensure reliable flow of bulk solids from storage bins and hoppers.