AMH offers dilute phase pneumatic conveying systems that operate on the principle that the solids will be suspended in the pneumatic conveying line air stream. This is accomplished by metering product into a moving air stream. Dilute phase pneumatic conveying velocities typically are greater than 18 m/s and material to air ratios are less than 12 to 1. Individual particles in the air stream will have some separation by their suspension in the air stream.

Many products are commonly conveyed in dilute phase pneumatic conveying systems.  In many cases, the product subject to conveying needs to be evaluated based on process needs to ensure the desired results can be achieved.

Dense phase pneumatic conveying systems operate below the minimum suspension velocity and are characterized by product moving along the bottom of the pipe in conveying slugs or a moving air conbeying bed. The product that receives air or pneumatic conveying principles is air or vacuum powder conveyed below its saltation velocity at high differential conveying pressures. Air and vacuum powder conveying velocities are typically less than 13 m/s and material to air ratios of up to 100 to 1 are possible. Interaction of the conveying particles in a dense phase pneumatic conveying system is greater than in dilute phase pneumatic conveying systems.

Common industrial applications for dense phase pneumatic conveying systems include products with heavy bulk-densities, abrasive products, friable products, blended products and in some instances products that do not require continuous conveying delivery to their end destination. In many cases, the conveying product needs to be evaluated based on process needs and possibly lab tested prior to final pneumatic conveying system selection to ensure the desired results can be achieved.