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The following back issues of Diamondback Technology's e-newsletter are available electronically. Check the box if you would like to receive a copy via e-mail. Future issues will be available to order online soon.
If you would like information on the availability of past issues of Binside Scoop or DBT News, please contact us for details.
Arching: Eliminating arching hangups in hoppers. When an arch develops, it mostly forms at the hopper outlet or the smallest cross-section of the convergence. Arching is caused by cohesive forces within the material. . .
Flooding/Flushing: Preventing flooding and flushing. Powders may flow like water through any crack or crevice, even through clearances in rotary air locks, and create process instabilities, hazardous spills or serious housekeeping problems. Powder flooding or flushing is caused by excess air that is trapped in voids between the individual powder particles. . .
Air Injection: Using air injection to boost fine powder flow rates. The objective of air injection is to increase the flow rate to that required by a process. Its use can increase powder flow rates several hundred times beyond that allowed without air injection; however, in the following scenarios, air injection may be necessary for reasons other than just increased flow rates . . .
Particle Segregation: Understanding causes of particle segregation. There are more than a dozen easily identifiable segregation mechanisms that result in out-of-spec product, but the five most common segregation mechanisms -sifting, angle of repose, fines fluidization, air currents and chute trajectory are responsible for more than 80 percent of segregation problems in solids processing and storage. . .
Caking: Assessing and eliminating caking problems. There are several factors or mechanisms that affect a material's tendency to cake and that will, over time, produce the kind of cohesion and strength that will create serious discharge problems in bins, hoppers and silos. Some materials are more susceptible to caking than others, but knowing the conditions that produce caking and the types of mechanisms associated with a given bulk solid, allows plant managers to make operational changes that will reduce these caking effects. . .
Bin and Feeder Combo: Selecting the best bin and feeder combination. Most processing plants require several feeding op-erations to achieve a finished product. Frequently, the material must feed on demand at a consistent, controlled rate, and when the rate isn't achieved, often the feeder gets the blame. . .
Ratholing: Understanding and eliminating costly ratholes in bins and hoppers. Ratholes are circular, cylinder-shaped holes that form above a bin outlet and eventually become an integral part of a bin’s structure. Ratholes are costly. They rob vital bin capacity. They can collapse unexpectedly, compacting material that then contributes to arching, or exerting large dynamic forces that can rip a bin from its surrounding structure. . .

Contact us at

Diamondback Technology, Inc.
7215 San Gabriel Road
Atascadero, CA 93422
(805) 544-3775


Diamondback Technology's
e-newsletters provide an excellent, brief overview of common bulk solids handling problems and ways to identify and correct them. Each issue also contains an actual case history and the solutions designed to correct flow problems.

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