Fly Ash Pneumatic Conveying Systems, Poland

Two Mactenn fly ash dense-phase pneumatic conveying systems were supplied to convey 30t/h each over a distance of up to 385 meters horizontally and 36 meters vertically. The ash systems are designed to convey 31,500 Kg/h of ash. Both conveying systems are located under a feed hopper with start and stop controlled in automatic by the feed hopper and silo reception level probes. The fly ash systems are working very reliably with no line blockages and exceed the customer’s expectation regarding transfer rate and performance. These particular Mactenn systems incorporated multiple manifold settings allowing the transfer of a range of fly ash products over various distances. The final convey air requirement on the longest route was 760 scfm compared to the proposed 988 scfm resulting in a saving both in cost and air used from the compressed air system. One particular problem was a very low control air pressure resulting in a compromised sealing of the Inflatek Valve inflatable seal. This was overcome by installing a pressure doubler and small air reservoir to provide more than sufficient instrument air pressure and excellent sealing.


Fly Ash 0.06 mm to 0.2 mm
Bulk Density 34 – 48 lb/ft³
Temperature 200°C
Moisture Content Dry
Condition Free Flowing


  1. Dense phase low velocity conveying
  2. Reliable operation.


Transfer Capacity 31,500 Kg/h
Conveying Distance 422.4528 meters
Reception Points 1 feed and 2 reception point per system.


  1. Increased transfer rate
  2. Cost savings: reduced compressed air requirements 3. Increased reliability compared to older system.

For more information please contact Mactenn.

Maxflo Vessels