What is a pneumatic conveying system?

A pneumatic conveying system moves dry bulk materials through a pipeline using air or gas flow. These systems are commonly used to transport powders, pellets, and granules efficiently and safely across industrial facilities.

What materials can be conveyed using pneumatic conveying systems?

Pneumatic conveying systems can handle a wide range of materials, including plastic pellets, cement, fly ash, food ingredients, minerals, chemicals, and other abrasive or non-abrasive bulk solids.

What is the difference between dense phase and dilute phase conveying?

Dense phase conveying moves material at low velocity and high pressure, reducing wear and degradation. Dilute phase conveying uses higher air velocity and lower pressure, making it ideal for lighter, free-flowing materials.

Which components wear out fastest in a pneumatic conveying system?

Elbows, bends, tees, diverter valves, and pipe transitions experience the highest wear due to material impact and turbulence. These areas often require reinforced or wear-resistant components.

How can wear be monitored in pneumatic conveying systems?

Wear can be monitored using visual inspections, ultrasonic thickness testing, or embedded wear detection technology that alerts operators when a component reaches a critical wear point.

What are wear-resistant elbows and why are they important?

Wear-resistant elbows are engineered with specialized materials or coatings designed to withstand abrasive material flow. They extend system life, reduce unplanned downtime, and improve overall conveying reliability.

How do I know when a pneumatic conveying component needs replacement?

Signs include reduced system efficiency, pressure loss, visible leaks, excessive dust, or wear indicators triggering alerts. Proactive monitoring helps prevent unexpected failures.

Can pneumatic conveying systems be customized for specific applications?

Yes. Systems can be customized based on material properties, flow rates, distances, pressure requirements, and plant layout. Custom components help optimize performance and minimize wear.

How do I choose the right components for my pneumatic conveying system?

Selecting the right components depends on material abrasiveness, conveying velocity, operating pressure, temperature, and maintenance goals. Consulting with an experienced pneumatic conveying specialist ensures proper system design and longevity.

Pneumatic Conveying Glossary Hub

Pneumatic Conveying Glossary: Common Terms and Definitions

Introduction

Whether you’re designing a new pneumatic conveying system, troubleshooting an existing process, or researching equipment options, understanding industry terminology is essential.

This pneumatic conveying glossary defines common terms used in bulk material handling, pneumatic conveying systems, industrial elbows, airlocks, and material transfer applications. Use this guide as a quick reference for key definitions and links to more detailed resources.

Air Velocity

Air velocity refers to the speed at which air moves through a pneumatic conveying system. Maintaining proper air velocity is critical because excessive velocity can increase wear and material degradation, while insufficient velocity may result in plugging and material buildup.

Attrition

Attrition is the breakdown or degradation of material particles during conveying. Fragile materials can fracture when subjected to excessive impact, turbulence, or conveying velocity, resulting in dust, fines, and reduced product quality.

Bulk Material

Bulk material is any dry solid material that is transported or processed in large quantities. Examples include powders, pellets, grains, resins, minerals, and food ingredients.

Centerline Radius (CLR)

Centerline Radius (CLR) is the distance from the center of an elbow’s curve to the centerline of the pipe. CLR is commonly used when specifying pneumatic conveying elbows and directly impacts wear characteristics and material flow.

Learn more: CLR article

Ceramic-Lined Elbow

A ceramic-lined elbow is a conveying elbow that incorporates highly wear-resistant ceramic materials to protect against abrasion caused by aggressive bulk materials. These elbows are often used in severe-wear applications.

Learn more: Ceramic Lined Elbows

Dense Phase Conveying

Dense phase conveying transports material at relatively low air velocities while maintaining a high material-to-air ratio. This method reduces wear, minimizes product degradation, and is commonly used for fragile or abrasive materials.

Dilute Phase Conveying

Dilute phase conveying moves material while it remains suspended in a high-velocity airflow. This is one of the most common pneumatic conveying methods and is often used for applications requiring continuous material movement.

Diverter Valve

A diverter valve redirects material flow from one conveying line to another. These valves are commonly used in systems that distribute materials to multiple destinations.

Flat Back Elbow

A flat back elbow is a specialized elbow design that uses a protected impact zone to reduce wear caused by abrasive materials. These elbows are designed to improve service life compared to conventional elbows.

Learn more: elbow products page

HammerTek Elbow

A HammerTek elbow is a specialized elbow design that creates a self-generated material cushion along the impact zone, reducing wear and extending elbow life in abrasive conveying applications.

Lean Phase Conveying

Lean phase conveying is another term frequently used to describe dilute phase conveying, where material remains suspended in an airstream throughout transport.

Material Degradation

Material degradation refers to unwanted changes in material properties caused during conveying. This can include particle breakage, dust generation, attrition, and product quality loss.

Pneumatic Conveying

Pneumatic conveying is the process of transporting dry bulk materials through enclosed pipelines using airflow or gas pressure.

Pneumatic Conveying System

A pneumatic conveying system consists of equipment used to move bulk materials through pipelines using air pressure or vacuum. Components may include blowers, airlocks, elbows, piping, filters, and receivers.

Learn more: Components of a Pneumatic Conveying System article

Pressure Drop

Pressure drop refers to the reduction in air pressure that occurs as air and material travel through a conveying system. Excessive pressure drop can negatively impact system performance and efficiency.

Rotary Airlock

A rotary airlock is a mechanical device used to control material flow while maintaining air pressure separation between different parts of a pneumatic conveying system.

Short Radius Elbow

A short radius elbow has a smaller centerline radius relative to pipe diameter. While compact, short-radius elbows typically experience greater wear due to sharper directional changes.

Long Radius Elbow

A long radius elbow features a larger centerline radius that allows smoother material flow and often reduces wear compared to short-radius designs.

Streamers and Fines

Streamers and fines are small fragments or dust particles generated when materials degrade during conveying. Excessive streamers and fines can affect product quality and downstream processing.

Tube

Tube is specified using its outside diameter and wall thickness. Tubing is commonly used in applications requiring tighter dimensional tolerances.

Pipe

Pipe is specified using nominal pipe size (NPS) and schedule thickness. Pipe is the most common transport medium used in pneumatic conveying systems.

Wear Resistance

Wear resistance describes a material’s ability to withstand abrasion, erosion, and mechanical wear over time. It is a critical consideration when selecting elbows and components for abrasive conveying applications.

Frequently Asked Questions

What is pneumatic conveying?

Pneumatic conveying is a method of transporting dry bulk materials through enclosed pipelines using air pressure or vacuum.

What are the main types of pneumatic conveying?

The two primary methods are dense phase conveying and dilute phase conveying.

What causes wear in pneumatic conveying systems?

Wear is commonly caused by high conveying velocities, abrasive materials, directional changes at elbows, and improper system design.

What is a rotary airlock used for?

A rotary airlock regulates material flow while maintaining pressure separation within a pneumatic conveying system.

Why are pneumatic conveying elbows important?

Elbows experience the highest wear in most conveying systems because materials repeatedly impact the change in direction.