in detail in the referenced patents so that repetition is unnecessary herein those improvements provided by this invention will become apparent from the following description which sets forth in detail those features provided by this invention heretofore these systems have not been versatile enough in operation to adapt to various kinds of special use without extensive modification or special engineering adoption for example to handle different bulk material flow rates and drastically different kinds of material characteristics such as weight granularity abrasiveness sensitivity to moisture or damage etc for use in sandblasting or cleaning operations therefore the bulk material flow rate of sand would typically be six tons per hour whereas loading of sand or grain in a barge would require handling more than 200 tons per hour this range leads to such drastic flow difference in the prior art system that the hulbert hyperbolic storage hopper arrays would be inoperable to provide the unimpeded continuous gravity flow characteristic into the pneumatic conveyor tube over such a drastic change of flow rates particularly in view of the necessity to store in the hopper and discharge by gravity into the pneumatic tube much larger volumes of bulk materials for the higher rate of material transport also further problems unanswered.