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 DUST-FREE, TOTAL TRANSFER OVER LONG AND TORTUOUS ROUTES
Although Spiroflow was founded on and has spent many years developing mechanical conveyors for a whole host of applications, we have long recognised that there are many applications where the optimum solution is either Vacuum or Positive Pressure Pneumatic Conveying. As a result, these conveying methods have been included in our portfolio for several years now. Moving forward, we have now established a new range of ‘Spiroflow’ Vacuum and Positive Pressure Pneumatic Conveyors.
Vacuum Conveyors
Vacuum Conveyors are the obvious choice where products have to be conveyed longer distances and over torturous routes. Throughput rates of around 10 tonnes/hr over distances upto 100 m are typical but can be exceeded according to the material being conveyed.
A vacuum conveyor uses air to convey materials through an enclosed pipeline. It provides a solution for users requiring a system that is easy to route, has few moving parts, is dust tight in operation and empties of product leaving minimum residue. Vacuum conveyors are the preferred choice for toxic or otherwise hazardous materials because air is sucked-in and, in the event of accidental damage to the conveying tubes, this prevents the escape of product to atmosphere.
The motive force is provided by either a positive displacement blower or a high efficiency side channel fan sited at the receiving end of the system.
Air powered ’Venturi’ systems are ideal for low capacity conveying, they offer low capital cost and are not as expensive to run as many may have been led to believe.
Vacuum systems are usually the only way to suck material out of tubs or other open top containers such as kegs and drums. They are ideal for applications with multiple inlets too.
Reverse jet, self-cleaning, filters that clean the conveying air (which has to be returned to the atmosphere after use), reduce maintenance and minimise product loss.
Positive Pressure Conveyors
They are probably the most versatile of all conveying systems given that other than for cost considerations there is virtually no limitation on capacity, product type, distance or routing. Lean phase systems (where the ratio of product to air is low) can move mountains of product. Dense phase or plug flow systems move ‘slugs’ of product at lower speeds with minimal degradation.
Positive pressure pneumatic conveying is generally used to convey materials from a single source to one or multiple destinations. Pneumatic conveying systems are normally the preserve of ‘big league’ applications such as the rapid discharging of road and rail tankers in to silos and the transfer of product from silos to large-scale production processes. For products with a bulk density exceeding 550 Kg/m3, capacities of up to 50 tonnes/hr are not unusual utilising a 200 mm diameter conveying line.
 Click to download PDF Datasheet
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