dilute phase conveying at high air velocity (20 30 m/s) strand conveying at limited air velocity (15 20 m/s) dense phase conveying at low air velocity (5 10 m/s) Pneumatic systems can operate with both positive and negative pressure (vacuum). The working pressure should not extend 40 kN/m2. Negative Pressure Pneumatic Conveying System
· Bulk density of the material is also a factor in calculating the size of the conveying line, which in turn determines the vacuum producer and conveying velocity. Higherbulk density materials require faster transport velocity. 2. KNOW YOUR CONVEYING DISTANCE Conveying distances comprise both horizontal and vertical factors.