These low-velocity systems generally incorporate in line booster fittings to add required conveying air or gas. Dense Phase Pressure Conveying is ideally suited for conveying hard-to-handle, abrasive or fragile products.For example, the lower velocity bulk phase operation is popular for highly abrasive products or for those that degrade easily. The choice between dilute and dense phase operation is typically dependent on the solids properties. Then after the filter, a blower can be used to forward the solids to the final receiver. Since the cars cannot be pressurized, air is pulled from the outside, through the car (carrying solids with it) to a filter. A very common application is the unloading of a standard railcar.
Pressure-vacuum operation (utilizing both methods) are sometimes ideal for a given conveying setup. Dilute phase pressure systems can easily achieve pressure differentials of 12 psi.
Vacuum systems are also more "distance sensitive" than pressure systems due to the maximum pressure differential of 5.5 to 6.0 psi. However, it becomes costly to have multiple destinations because each must have its own filter receiver with partial vacuum capability. Vacuum systems allow multiple product inlets through the use of simple diverter valves.
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