Pipeline blockage in pneumatic conveying systems

Some experts discuss some of the reasons for pipeline blockage in pneumatic conveying systems. There are systems which occasionally fail due to pipeline blockage on start up where the pipeline is left fully or partly filled with product that cannot be 'blown clear' and the pipeline needs to be broken down and cleared manually. Few potential reasons for such failure include moisture in the line, cold conveying air, or product left in the line. A pipeline blockage due to moisture in the line is expected to be an intermittent occurrence when the conditions are right. The blockage mechanism is that moisture in the conveying gas condenses on to the surface of the pipe wall and conveyed solids adhere to the liquid covered wall restricting the flow covered wall restricting the flow. This can be a problem particularly for lines which are routed outside of buildings and are exposed to large temperature fluctuations.