Given that the optimum solution for a number of applications is either a vacuum or positive pressure pneumatic conveying system, Spiroflow’s new pneumatic conveyor range, provides the industry with a complete solution for both European and US markets. The range is enhanced by excellent demonstration facilities to further promote its application.
With a pneumatic or vacuum conveyor, the product is conveyed in a suspended stream of gas, usually air, through an enclosed pipeline. Throughput rates are around 10 tonnes/hr over distances of up to 100m, but can be exceeded depending on the material being conveyed. The particulate materials are metered into an airstream at an optimal solids-to-air ratio, with the differential air pressure generated via a vacuum pump creating a high enough velocity to move the materials within the conveying tube. Given its simplicity and with few moving parts, the pneumatic system is a good solution for moving material across challenging routes.
Dust tight in operation, pneumatic conveying systems leave minimal residue and are often the preferred choice for toxic and hazardous materials. In the event of accidental damage to the conveying tubes, escape of product into the atmosphere is prevented as air is being continually sucked into the system.
Positive Pressure Systems
Positive pressure pneumatic conveyors are generally used to convey materials from a single source to one or multiple destinations over longer distances and with greater capacity than vacuum systems. Consequently, pressure systems are normally the preserve of ‘big league’ applications such as the rapid discharging of road and rail tankers into silos and the transfer of product from silos to large-scale production processes.
Vacuum pneumatic conveying systems are usually used for moving material from multiple sources such as storage vessels, process equipment, trucks and railcars, to individual or multiple destinations. Unlike positive pressure systems, vacuum systems provide easy pick-up of materials from open containers using wands, and do not impart heat to the material. Since vacuum systems offer superior leak containment, being fully enclosed, they are often specified on the basis of cleanliness, particularly when handling hazardous materials.
An installation that clearly demonstrates the production benefits of such a system was for West Yorkshire-based Tangerine Confectionery. To improve production, the company decided to install a completely new sherbet blending and delivery system, comprising of vacuum conveyors, a sifter with an integral magnet metal trap, a mixer and a buffer hopper. Spiroflow handled the entire installation, also designing and manufacturing an electronic control system to easily control the main elements of the process.
In conclusion, given that there is virtually no limitation on capacity, product type, distance or routing, a well-designed pneumatic conveying system is often a more practical and economical method of transporting materials than alternative mechanical systems.
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Spiroflow is a global leader in the field of powder handling and dry solids processing and an emerging leader in control systems integration. Throughout our 45-year history, our design engineers and process automation team have provided customers with the safest, most efficient, innovative and most reliable process solutions available.Yes, we ...