Below is a list of Dense Phase Conveying manufacturers from St. Paul, Minnesota. Dense phase conveying, also referred to as non-suspension flow, is one of the two main methods of pneumatic conveying. The other method is dilute phase conveying, and the main points of difference between the two are pressure, the solids' properties and the rate of conveying speed. In particular, dense phase conveying deals with the transportation of abrasive, friable or heavy materials such as sands, soils, minerals, food, paper scraps and rocks.