Abstract
The selection of a fan, blower, or compressor is one of the most important decisions to be made in the design of a pneumatic conveying system. It is often the largest single item of capital expenditure and the potential conveying capacity of the plant is dependent upon the correct choice being made. The rating of the fan, blower, or compressor is expressed in terms of the supply pressure required and the volumetric flow to be delivered. The delivery pressure, or the vacuum required depends essentially upon the working pressure drop needed over the length of the conveying pipeline. The pressure drop across the gas-solids separation device is usually neglected, but if a blow tank is used for feeding the material into the pipeline, then an allowance for the pressure drop across the feeding device is made. The magnitude of the conveying line pressure drop, whether for a positive or a negative pressure system, depends to a large extent on the conveying distance and on the solids loading ratio at which the material is to be conveyed. The volumetric flow rate required from the fan, blower, or compressor depends upon a combination of the velocity required to convey the material and the diameter of the pipeline to be used.
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