A. Dilute Phase Vacuum Conveying Systems :
These vacuum pneumatic conveying systems are installed primarily wherein multiple feed points are involved. The advantage of this system is any leakage is inward due to which these systems are popular for conveying of explosive or hazardous products. As the system is operating below the atmospheric pressure the conveying velocities are generally higher than the pressure conveying. These systems are also popular for short distance conveying in food and pharmaceutical industries.
B. Dense Phase Vacuum Conveying Systems : Dense phase vacuum conveying systems are used for very short distance of conveying typically below 15 mtrs with 1 or 2 bends. The components are specially designed suction nozzle, conveying piping, product separator and airlock valve.These systems are operating below (-) 5000 mm of WG using roots blowers and used for product conveying from bags / drums or hoppers.