The pickup velocities of five different materials having varying average particle sizes, shapes and densities were determined using both air and carbon dioxide up to a pressure of 307 kPa. Under these increased gas density conditions, lower pickup velocities were obtained requiring less energy to move these solids under the higher pressure conditions. Higher pressure systems, however, are more expensive than atmospheric units to construct and operate. The reduced velocities of conveying diminish the attrition of the material and erosion of the piping. A new correlation for pickup velocities developed by Cabrejos and Klinzing proved effective in predicting the experimentally obtained values.