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Greystone Aggre-Spec Classifying Systems, Controllers

Greystone's legendary system does it all.

Fri July 19, 2013 - National Edition
Construction Equipment Guide

Aggre-Spec sand classifying systems, manufactured by Columbus, Neb.-based GreyStone Inc., produce up to three products, including two spec products, from natural or manufactured sand blends. Aggre-Spec classifying systems allow producers to scalp excess water, reject excess material, separate and size sand particles and re-blend up to two industry-standard spec products simultaneously. Urethane discharge valves and seats are self-aligning to keep valves centered for maximum flow and long life. Discharge boots also are urethane, with the optimum angle for maximum flow and reduced wear of the flume’s abrasion-resistant lined floor. GreyStone offers a full line of Aggre-Spec classifying systems, as well as controls, including:

Stationary Aggre-Spec tanks, with 10 classifier models, ranging in size from 8 by 20-ft. (2.4 by 6 m) to 12 by 48-ft. (3.6 by 14.6 m). Stationary structures offer from six to 11 classifying stations with three cells, capable of producing up to three products at one time.

Semi-Portable Aggre-Spec classifying systems, featuring a modular, low-profile construction and stack-up design for quick installation. This line includes 18 classifier models, ranging in size from 8 by 24-ft. (2.4 by 7.3 m) to 12 by 48-ft. (3.6 by 14.6 m). Semi-portable structures offer from seven to 11 classifying stations and produce up to 820 tph (744 t).

Portable Aggre-Spec classifying systems, featuring a low-profile design for quick transport and installation. This line includes 8 classifier models, ranging in size from 8 by 24-ft. (2.4 by 7.3 m) to 10 by 40-ft. (3 by 12 m). Portable structures offer from seven to 11 classifying stations and produce up to 350 tph (318 t).

GreyStone Aggre-Spec control systems offer a Windows-based control system that allows producers to make an unlimited number of recipes of two products. Aggre-Spec control systems hold to tight product specifications and warn operators of potential out-of-spec product conditions.

The Aggre-Spec V6 re-blending system — GreyStone’s most advanced unit — allows operators to view information on one screen that used to require multiple screen views. This information can easily be accessed from a laptop, allowing the operator freedom of movement and control from a remote location.

In addition, the Aggre-Spec V6:

• Increases production by up to 15 percent

• Re-blends up to three spec products, including two spec products simultaneously, using single or twin tank controls

• Offers simple product spec changes and multi-tasking capabilities with three-method Windows-based programs

• Stockpile analysis compares finished product against expected products and input settings

• Report module collects data, including FM, yield, feed gradation and output gradation, and stores in spreadsheet format for flexible reporting

• Retrofits to more than 30 different classifier models, with up to 11 stations

For more information, call 888/346-WASH or visit

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