Pressure Lean Phase

Pressure Conveying - Lean Phase

Lean or dilute phase pressure conveying systems use positive displacement blowers - providing air at up to 1 Barg - to convey materials through a pipeline to a destination where the air and product are separated by a filter.


The product must enter the pipeline, which is at a higher pressure, via a special feeding device (a rotary valve airlock or a Venturi). It is then suspended in the airflow and moved at relatively high velocities depending on particle size and density. Generally operating on a continuous basis, product is constantly charged at the loading point and arrives at the destination without interruption, enabling this type of system to be easily adapted for dosing and continuous weighing applications.


Lean phase pressure conveying is particularly suitable for conveying low to moderate capacity materials over medium distances, from single or multiple points to multiple destinations. Versatile and adaptable, the low operating pressures allow less expensive pipelines and fittings to be used and, as such, these systems are often the most cost-effective solution for typical conveying applications.


Convey Rates:           low to high (<1–50 tonnes/h)
Convey Velocities:     15–30 m/s
Convey Distances:     <200 m
Air mover:                 positive displacement (Roots Type) blower or fan
Operating Pressure:    <1 Barg
Material:Air Ratios:     low to medium (3–15 kg/kg)

NB: All values are approximate: please contact GEA for advice about how to convey your product.


A wide variety of options for system and component design is available to suit particular system requirements, including the following: 

  • weighing and dosing equipment
  • specialized feeding systems for cohesive, sticky or lumpy products and other special properties
  • air filtration, dehumidification and cooling systems
  • noise attenuation systems
  • inline sifting, sampling, delumping, metal detection and magnetic separation systems 
  • stainless steel construction for sanitation or corrosion resistance 
  • demountable and polished designs to USDA 3A standards for ease of cleaning 
  • sanitary systems for food, dairy and pharmaceutical products 
  • inert gas systems for explosive products 
  • stepped lines to reduce terminal velocities, abrasion and degradation.

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