Since water is incompressible, in a hydraulic transport system the speed variations along the route are very small, therefore water pressures of up to 150 bar are possible. When designing pneumatic conveying systems based on compressible gases, such as air, 5 bar is rarely exceeded. By definition, high operating pressures are those above one bar. The motion of the air-material mixture is due to difference in pressure between the starting and the finishing points. This difference, known as pressure drop, is directly proportional to phase density, straight length of the pipe and velocity square of the transport air. With this in mind, everything possible should be done to keep the velocity of the transport air low, not only to minimize consumption and degradation, but also to improve the performance of the entire system.