From pebble lime to peanuts, from coal to baby powder - and everything in between – pneumatic conveying has long been a popular choice for moving bulk materials, either from storage facilities to a process unit, or between process units. Two most distinct categories of pneumatic conveying can be described as either dilute-phase or dense-phase systems. These have been developed over the past few decades to take advantage of the different behavioural properties of bulk materials and also to meet the increasingly demanding requirements of industry in the areas of system reliability, product quality control and energy efficiency. Pneumatic conveying systems are basically quite simple and are eminently suitable for the transport of powder and granular materials in factory, site and plant situations. The system requirements are a source of compressed gas, usually air, a feed device, a conveying pipeline and a receiver to disengage the conveyed product and carrier gas. With suitable choice and arrangement of equipment, materials can be conveyed from hopper or silo in one location to another location some distance away. Considerable flexibility in both plant layout and operation are possible, such that multi-point feeding can be made into a common line, and a single line can be discharged into a number of receiving hoppers. Flow rates can be controlled easily and monitored to continuously check input and output, and most system can be arranged for completely automatic operation.