Contact Us

Call us:
(800) 433 2213
(865) 984 5286

Send a fax:
(865) 977 4131

Where are we:
Macawber Engineering, Inc.
1829 Clydesdale Street
Maryville, TN  37801

Customer Support:

Representative Network:
Macawber RepNet

What is Pneumatic Conveying?


The Scientific Approach


Macawber's philosophy is a scientific approach to design with unmatched innovation and experience. We realize that every system is different and each company has different needs.

Therefore, before we present any recommendations, we carefully review the two major issues of any bulk handling system: material characterization and the system design objectives.

The result? An optimized design for your individual needs with addresses both technical and economic consideration, backed up with a wealth of experience.

Material Characterization
Particle size and distribution
Bulk density
Moisture content

Design Objectives
Transfer rate
Transfer or injection
Positive or negative pressure
Distance and conveying route
Feed consideration
Conveying medium type
Material integrity
Velocity / pipewear
Operating cost


pneumatic conveying macawber mactenn

Understanding pneumatic conveying makes vital decisions much easier.

A comprehensive, interlocking group of system types is required to meet the needs of a wide variety of applications in every process industry involving bulk material handling.

From pebble lime to peanuts, from coal to baby powder - and everything in between - Macawber has the technology, the hardware, and the experience to design and supply the proper technology group for reliability and life cycle economy.

Selecting the correct pneumatic conveying regime for your requirements is a vital decision for a successfully designed system.

Almost all applications will benefit from a regime providing the heaviest line loading and the lowest material velocity. These attributes also provide the greatest conveying gas economies for efficient power consumption.


Dense Phase - Full Pipeline

Pressure is higher

Material velocity is lowest

Material nearly fully fills pipe line


Dense Phase - Slug Flow

dense phase dune flow

Pressure is higher

Material velocity remains quite low.

Material forms moving dunes as it is conveyed.


Dense Phase - Bed Flow

Pressure is middling, lower than full dense phase.

Material velocity is mixed. Bed material moves slow.

Material above the moving bed is flowing above saltation velocity.


Lean Phase (Dilute Phase)

Low pressure conveying

Material moving at high velocity.

All material is above saltation velocity, and is entrained in gas flow in pipe.

Highest wearing conveying regime, also has high air consumption.


We have a product for every range of pneumatic conveying