This website uses cookies. For more information on our cookie policy click the link below.

  • Vacuum Conveying Systems
Increase Font:

Pneumatic Conveying Systems - Dense Phase Pneumatic Conveying

Principle and Operation

As a division of Mass Measuring Ltd, Rospen Industries offer the MassBlowDP range of low velocity, dense phase solids pumps, for smooth conveying of difficult materials. Manufactured by its Manchester based parent company the design is simplicity itself. With most applications, level probes and outlet valves are not mounted within the pressure vessel since the valve, an InflatekTM, is designed to close and seal through a static or dynamic column of material. This ensures complete vessel filling and no reliance on vessel level probes.
The vessel capacity and pipeline size ensures the movement of material without dependence on fluidisation, pipeline boosters or high velocity.

Operating Sequence

InflatekTM Valve permits choke filling of the MassBlow vessel. Large diameter inlet flange permits unrestricted vessel filling. Valve closed by material at the end of the filling sequence, instantly sealing to prevent escape of conveying air. Air is introduced at a controlled rate to destination without the need for continuous fluidisation. Opening cycle is repeated continuously until the transfer signal is cancelled.

Some of the key benefits are listed below.

  • Conveys abrasive, hot and/or wet materials. Gentle handling of friable or irregular
  • products prevents degradation.Non-fluidising conveying reduces fluid air consumption (High phase density normal between 30 and 150).
  • High reliability up to 1,000,000 cycles between inspections in approved applications-even when handling abrasive materials such as sands, ash or coke fines.
  • Reduced pipe work wear, due to low velocity, even with the most abrasive materials.
  • Low air consumption. High material velocity is unnecessary to achieve almost all customer objectives. MassBlowDP is the best combination of reliability, durability, economy and performance in dense phase pneumatic conveying.


  • InflatekTM Valve available in standard sizes from 100mm to 500, and duty temperatures from -71°C to 482°C with pressure ratings from full vacuum to 41 bar G.
  • Constructed to our material specifications for most bulk solids handling applications

Selecting the correct pneumatic conveying regime to meet the required operational parameters is absolutely vital. Almost all applications will benefit from a system with the heaviest line loading and lowest material velocity. These attributes also provide the greatest conveying gas economies and lowest power consumption. The table below shows a comparison between the four basic configurations.




Pipe Section

Typical Application

Solid Dense Phase

Very Low

Fragile materials
Dis-continuous Dense Phase

Very Low

Where power economy, pipe erosion and material degredation are issues
Continuous Dense Phase

<Saturation Velocity

For powders and narrow p.s.d. materials. Not for abrasive materials
Dilute Phase

>Saturation Velocity

Non-abrasive materials Narrow p.s.d. materials



Rospen / Mass Measuring provide a total solution, taking responsibility for design, manufacture, delivery, installation, operator training and commissioning of complete projects including, if required, the supply of all associated equipment, steelwork and services.

Should you require any additional information or wish to discuss a project or even a problem, please use the following link to the ‘contact’ form.


Download PDFPneumatic Conveying PDF