Lesson 2/Learning Event 1
avoids down-time for recalibration of the plant to produce a second size product and aids in the management of
stockpiles. This concept is most profitable when a plant must produce two sizes of product which cannot be
processed without changing the roll shells of the secondary unit for the second size (Figure 18).
FIGURE 18. SHELL COMBINATIONS FOR DUAL ROLL CRUSHERS
For example, to produce 1-inch minus material with the 75-tph plant, a fine corrugated and smooth roll shell
combination would be used in the secondary unit. But to produce 1/2-inch minus aggregate with the same plant,
two smooth roll shells would be required in the secondary unit. To replace the
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