Lesson 1/Learning Event 3
Learning Event 3
DESCRIBE MILITARY CRUSHING AND SCREENING PLANTS
Equipment is available in the military supply system to enable units to meet their own aggregate production
requirements. The Army has a number of crushing plants of varying capacity (Table 1).
Function and Operation. The 15-tons per hour (tph) plant is the smallest and the most simple of the crushing
units (Figure 8). It is a small air transportable and air droppable jaw crusher. It is normally used by Engineer
Airborne Units to support combat activities in forward areas. Its sole function is to crush gravel or quarry rock to
product sizes suitable for base course material or limited concrete construction. The unit consists of a jaw crusher
assembly, a delivery conveyor, a gasoline engine, and a rubber tired running gear.
FIGURE 8. 15-tph PLANT
Production Considerations. The 15-tph plant is capable of primary crushing only. It will receive raw material up
to approximately 12 x 22 inches in size. The maximum product setting is 3 inches and the minimum is 1 inch. It
will produce in the range of 15 to 45 tons per hour depending upon the toughness of the rock and the product
Due to the inflexible nature and limited capability of the equipment, and the circumstances under which it is
normally used, only the most basic concepts of utilization and employment apply. Because it is readily