Much of this is due to system design. Low Energy System Design Requirements Company management's objective was to have the system run without human control or monitoring. Tanoak Enterprises, Inc., of Barrie, Ontario, Canada designed the system so that attention would be required only when a system failure occurred. System complies with federal and state environmental requirements. System is flexible and meets variable sand demand.
System operates automatically and unattended.
A number of unique design features contributed to system success. Attrition Unit - The sand attrition unit causes two sand streams flowing in opposite directions to repeatedly collide. The other flow is driven by impeller blades inside the container that are offset from the axis of the outer container and turn in the opposite direction. A low pressure air stream is used to convey fines, which consist of broken sand chips as well as eroded binder and contaminants from the sand surfaces, from the attrition unit to a dust collection system. These fines can cause low mold strength and are replaced with new sand.