long radius conveying bend

barrel bend

 

PNEUMATIC CONVEYING BENDS AND BARREL BENDS

In a pneumatic conveying system both wear and pressure drop are important factors to consider. Both of these factors are reduced if the radius of the conveying bend is increased, however, for abrasive materials such as cement, sand, mineral ores the standard bends will wear through after a short time.

Bulk Technik has successfully developed long radius bends that have re-enforced backing strip which prolongs a bend’s life. These type of bends are also called flat back bends and are suitable for moderately abrasive materials such as cement and fly ash. For powders that are far more abrasive, we have developed wear resistant bends that are lined with ceramic tiles or bends with basalt and silicon carbide cylinders that are placed into a metal housing.

A further alternative is to use barrel bends. These are specially designed bends which trap a pocket of material in the wear area which forms a protective layer. The major friction/wear is inter-material because the powder being conveyed is mainly in contact with the trapped material. For extremely abrasive materials, the high wear areas are protected with a ceramic lining.

Both the long radius bends as well as the barrel bends are supplied with SABS 1123-1000/3 flanges, however, other flanges can also be supplied on request.

 

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