Maxflo 85/8-3 pneumatic conveying systems

Maxflo 85/8-3 pneumatic conveying systems 

Three dense-phase, low velocity pneumatic conveying systems were supplied to convey coal dust between 1.5 t/h and 2.7 t/h over a distance of 160 m horizontal and 9 m vertical. Three systems were running on a 76.2 mm convey pipe line. All pneumatic conveyors are located under a feed hopper with start and stop controlled automatically by the feed hopper and silo reception level probes. The material handling systems are working very reliably with no line blockages and exceed the customer’s expectation regarding transfer rate giving 2.9 t/h for the smaller systems and 5.9 t/h for the large system 1. The pipe line conveying pressure was between 8 psi and 12.5 psi. Convey air requirement was substantially less than that proposed at 88 scfm and 180 scfm. The proposed air requirement was 176 scfm and 278 scfm. The systems are pneumatic only to the ATEX equivalent of Eexd Class II Division 2. The customer elected to control the systems through their own high level PLC and DCS systems.


Coal dust 0.004064 mm– 0.1016 mm
Coal pellets 5.08 mm – 10.16 mm
Bulk Density 25 lb/ft³
Temperature 80°C
Moisture Content 0%
Condition Free Flowing


  1. Dense phase low velocity conveying
  2. ATEX zone 22 Cat 3D
  3. Short delivery
  4. Reliable operation


Transfer Capacity Between 1.5 t/h and 2.7 t/h
Conveying Distance 160m Horizontal and 9m vertical
Reception Points 1 feed and 2 reception points per system.


  1. Increased transfer rate
  2. Reduced compressed air requirements
  3. Low than specified degradation

To find out more please contact us at Mactenn (a sister company of Macawber Engineering Inc. in the U.S.)