Screening Out Fines From PET Flakes...
Aerial view of West Central’s new Triple/S Dynamics Texas Shaker 60,000-bph grain cleaner in Boone, IA. Aerial photos by Adam Moeller, Moeller Engineering, Ankeny, IA.
Alternate aerial view of the Texas Shaker cleaner.
West Central Location Manager Kevin Brant (left) and Superintendent Trevor Hoyle both were involved heavily on the project. Ground-level photos by Tucker Scharfenberg.
West Central controls its new cleaning system with Rockwell Automation software.
A new InterSystems gravity screener sits below the Texas Shaker.
For nearly five years, West Central® Cooperative’s 9.3-million-bushel, 110-car shuttle loading facility located in Boone, IA had hoped to replace its 35-year-old, 30,000-bph grain cleaning system, but Regional Grain Superintendent Dean Riesselman (515-432-4563) says other urgent customer-facing projects were prioritized over a new grain cleaning system.
“It wasn’t until the rail market recovered recently that we were able to justify new projects like replacing our obsolete cleaning system,” says Riesselman, who has been with West Central since 1977.
In May 2015, West Central (www.west-central.com) hired McCormick Construction Co. (McC), Greenfield, MN (877-554-4774), to replace the cooperatives’s old cleaner with an automated, 60,000-bph cleaning system.
McC worked with Triple/S Dynamics, Inc., Dallas, TX (800-527-2116), to engineer the system.
According to McC Sales Executive Allan Tedrow, there were a number of unique challenges with the project, which began in mid-July and was completed in early November:
“Typically, cleaning systems this large consist of two cleaners rather than one large cleaner, but there wasn’t room for two,” says Tedrow.
This meant Triple/S had to engineer its largest Texas Shaker® vibratory grain cleaner yet, a 55,000-lb. system that scalps corn at 60,000 bph.
According to Triple/S Product Manager Ferdinand Schön, “the straight-line motion of the Texas Shaker is generated by a pair of counter-rotating unbalanced shafts coupled together with a pair of helical gears. Their opposite rotation generates the straight-line inertia force that causes it to move in reaction when applied to the screen box structure.
“This constant change in velocity and direction of the screening surface creates a shuffling effect in the material bed that promotes stratification and screening,” explains Schön. “It also intensifies the action of the cleaning balls, which impact the underside of the screen, to prevent blinding and to apply local agitation to assist in stratification.
“This positive conveying action (40 fpm on a 6-degree slope) moves the bed at a constant velocity to prevent uneven buildup on the screen,” he adds.
In addition to the Texas Shaker, McC also added a Hi Roller Model 54 Hi Life 60,000-bph enclosed belt conveyor to fill the cleaner from above, an InterSystems 40,000-bph gravity screener, and Schlagel gates.
The cooperative controls the entire cleaning system with a software program developed by Rockwell Automation, Inc., Milwaukee, WI (414-382-2000).
“It makes things so much easier for us,” says Riesselman. “You just simply click the desired grade and it does the rest.
“We’re very happy with the way this project turned out. McC did a fine job for their first project with us – I can’t say anything bad about their work,” he adds.
Riesselman explains that its new cleaning system gives the cooperative greater marketing flexibility. “We can now scalp, screen, and really make the grades necessary to ship to any market, which is great right now, because the west coast and export markets seem to be leaning again toward scalped lately.”
– January / February 2016 GRAIN JOURNAL
Tucker Scharfenberg, associate editor