Macawber Dense Phase Conveying Pressure Dense Phase Product Conveying - Macawber

Macawber dense phase powder conveying technology uses a scientific approach to design with unmatched innovation and experience.

Macawber® realize that every system is different and each company has different needs. The technology groups collectively respond to the entire spectrum of pneumatic conveying regimes and individually satisfy application-specific needs.

Typical Conveying Regimes

  1. Solid Dense Phase - Very low material velocity, pipeline full of material - an excellent regime for fragile materials.
  2. Discontinuous Dense Phase - Low material velocity - with high line loading ... material moves in plug flow fashion - best regime for most applications in which power economy, pipe erosion, and material degradation issues are important.
  3. Continuous Dense Phase - Higher velocity than discontinuous dense phase, but much lower than dilute phase. Used for handling powders that may be fluidized.
  4. Dilute Phase - Material velocity above the saltation velocity - no upper limit to the velocity.

Marketing Area

Markets served include: 

  • Basic Metals 
  • Chemicals 
  • Food / Dairy / Pharmaceuticals 
  • Plastics / Resins 
  • Minerals 
  • Pulp and Paper 
  • Combustion Systems (Industrial) 
  • Combustion Systems (Utilities) 
  • Miscellaneous Process and Applications

Dome Valve®

The Dome Valve® is unique in its ability to close and seal in one action through a static or moving column of material entering the conveying pressure vessel.  This feature ensures complete filling of the vessel and can be incorporated with a simple control philosophy that does not rely on level probes fitted into the vessel.

Pressure-tight sealing against a pressure differential when handling abrasive materials is achieved with an inflatable elastomer seal engaging the periphery of the dome component. The inflatable seal entraps particles preventing wear by erosion to the valve seat and seal. These advantages are maintained even through sever application conditions for abrasion, temperature and high pressure.

Material Considerations

  • Particle size and distribution 
  • Bulk density
  • Moisture content 
  • Flowability 
  • Chemistry 
  • Abrasiveness 
  • Friablity 
  • Temperature 
  • Permeability

Design Objectives

  • Transfer rate 
  • Transfer or injection 
  • Positive or negative pressure 
  • Distance and conveying route 
  • Feed consideration 
  • Conveying medium type 
  • Material integrity 
  • Velocity / pipe wear 
  • Operating cost