This chart is a compendium of hundreds of tests conducted in our
full scale test laboratories over a period of 25 years, combined with actual field data.
These figures are representative of free flowing materials within each bulk density range
and tend to represent averages only.
Since operating pressures vary with material characteristics and conveying distance, we have
not included it in this chart. However, most systems fall within the range of 30 - 50 PSIG.