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The Storage and Flow of Bulk Solids – A Practical Approach

Coming Fall 2025

7 hours


This introductory course covers the storage and flow of bulk solids, common flow problems, and their solutions. Methods to avoid flow stoppage, segregation, and rat-holing will be examined. Flow testing and the basics of bin and feeder design will also be discussed. This course is intended for all levels of personnel including managers, engineers, scientists, operators, and crafts people.



During this course, you will:

  • Learn how to design effective bins, hoppers, feeders, silos, and outlets
  • Examine flow patterns and how the whole system is affected when they go wrong
  • Gain an understanding of how best to improve the flow of materials in bins and feeders through proper design and calculations of critical bin dimensions
  • Predict the flow performance of various materials through your bins and feeders


Instructors: Joseph Marinelli and Scott Miller

Course Hours

You Will Earn

You Will Earn

All hours listed are in Central Time

8:00am - 4:30pm

You Will Earn

You Will Earn

You Will Earn

0.7 Continuing Education Units

7 Professional Development Hours 

Course Details

Flow Problems and Their Effects

  • Arching
  • Rat-holing
  • Flooding
  • Segregation

Flow Patterns

  • Mass flow
  • Funnel flow
  • Expanded flow 

Flow Properties

  • Definition of properties
  • Variables affecting properties
  • Shear testing and cohesive properties
  • Wall friction properties
  • Compressibility properties

Design Principles for Reliable Flow

  • Wall yield loci 
  • Yield loci
  • Flow functions
  • Bin pressure distribution
  • Flow-no-flow criterion
  • Flow factors

Critical Bin Dimensions

  • Arching capabilities
  • Rat-holing dimensions
  • Hopper slopes
  • Flow properties report

Volumetric and Gravimetric Feeders

  • Volumetric screws, belts, rotary valves, etc. 
  • Gravimetric feeders
  • Advantages and disadvantages

Particle Segregation

  • Reasons for segregation
  • Solutions to segregation problems
  • Segregation do’s and don’t's 

Flow Aid Devices

  • Improving flow patterns
  • Air blasters
  • Vibrators
  • Fluidization

Retrofits and Other Design Choices

  • Guidelines for solving existing flow problems
  • Options for retrofits
  • Retrofit do’s and don’t's

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