Dilute Phase Pneumatic Conveying

The Economical Way to Convey

Dilute phase pneumatic conveying is a means of transferring dry powdered or granular bulk materials through a pipeline. In dilute phase conveying, particles are fully suspended in the conveying air and transported at low pressure and high velocity. Dilute phase systems are extremely cost-effective and ideal for handling durable, non-abrasive, or light materials. From sorbent injection to truck unloading, and all general applications requiring the transfer of powdered or granulated bulk materials — choose dilute phase systems for an economical way to convey.

Nol-Tec’s Dilute Phase Pneumatic Conveying – the Difference

Dilute vacuum or pressure conveying can be used to transfer powdered or granular bulk materials through enclosed convey lines in an airborne state, but they each have different benefits.


  • Smaller capital investment
  • Lower installation costs
  • Minimal dusting
  • Flexible routing

Dilute Phase Pressure Conveying vs. Vacuum Conveying:

Why Choose Pressure Conveying

Our dilute phase pneumatic conveying systems use large amounts of low-pressure (<15 PSIG) to convey materials. In this method, a blower at the system’s start supplies a high volume of low-pressure air to the system, and material is fed into the conveying line through a rotary airlock valve. The system relies on the air stream’s velocity to pick up and entrain each particle, keeping the particles in suspension as they travel through the conveying line.

Fast Facts:

  • Requires relatively little headroom.
  • Simple to operate.
  • Ideal for conveying materials from a single source to multiple locations.
  • Most often used with non-abrasive, non-fragile materials that have a light bulk density (typically less than 62 lb/ft3).
  • Common examples are: flour, sugar, corn starch, plastic granules, sodium bicarbonate, hydrated lime, activated carbon, and zinc oxide.

Why Choose Vacuum Conveying

Our dilute phase pneumatic conveying systems use large amounts of vacuum high-velocity (3,500-9,000 ft/min) air to convey materials. This system is typically used to convey materials over short distances at low capacities.

Fast Facts:

  • Suitable for conveying materials that tend to pack or compress under pressure such as wood shavings and certain other fibrous materials.
  • Ideal for toxic materials that must not leak into the workplace air supply.
  • Minimal headroom at the feedpoint required.
  • Ideal for conveying material from multiple sources to a single destination.