Portable Design and Respectable Production

By Walt Moore, Senior Editor | September 28, 2010

The Terex E275P portable, counter-flow drum mixer has a rated capacity of 275 tph, and it is designed to be moved in five loads.

Terex Roadbuilding recently announced the latest addition to its line of super-portable asphalt plants, the Terex E275P. This new counter-flow, drum-mix plant features production capability to 275 tons per hour, and it is joined by three other plants — the E100P, E150P and E225P — to round out the Terex line of low-load, portable plants. Says the company's Mark Spicer, sales director for asphalt plants, "the market continues to demand higher-production plants in low-cost, portable designs."

According to Terex, the entire E275P plant can be moved in only five loads: 1) counter-flow drum mixer; 2) bag house; 3) self-erecting silo; 4) four cold-feed bins with scalping screen; and 5) liquid AC (asphalt cement) tank, control house and fuel tank. The E275P, says the company, features significantly fewer connections than conventional portable plants, and it requires no crane assistance for set up, allowing the new plant to be transported and completely installed during a weekend.

The plant's drum mixer is pitched at an operating angle on its triple-axle chassis, and all duct work is already installed. This design, says Terex, significantly reduces set-up and tear-down times. With the self-contained drum's diameter of 84 inches and length of 39 feet 5 inches, the chassis can be quickly moved, according to Terex, "with standard 'O.D.' permits."

Producers have the option of choosing a fuel-efficient Hauck 96.8-million BTU SJ520 burner or the 100-million BTU ESII burner for aggregate heating. For introducing aggregate into the drum, the E275P uses a "slinger" conveyor. Slinger protrusion into the drum can be adjusted, with the effect, says Terex, of increasing or decreasing drum length to optimize drying and mixing times. The drum is designed with the capability of making a wide variety of mix designs; and its counter-flow design, says the company, permits using higher percentages of RAP (recycled asphalt pavement) than parallel-flow drums — while remaining within environmental compliance.

For particulate control, the E275P includes the Roto-Aire RA318 bag house. With its 48,000-cfm capacity and 4.5:1 air-to-cloth ratio, it is designed with ample capacity to match plant production. Integral to the bag house is the fines-return auger, which hydraulically pivots into position to interconnect the bag house to the drum, resulting in no "loose loads" for transport.

For mix storage, the plant includes the self-erecting, 95-ton SE195 silo. The SE195 hydraulically erects into operating position, while, simultaneously, the drag slat conveyor automatically transitions from its nested travel position to the correct operating angle. For ticketing purposes, the silo is suspended on load cells that accurately weigh the amount of stored asphalt before and after a truck is loaded. Plant operation and asphalt-mix designs are managed by the Terex Impulse X control system, which, says Terex, features "big-plant operation in a smaller-plant controls package."

The standard plant package incorporates a chassis containing four, 20-ton cold-feed bins, a single-deck scalping screen, an underlying bin conveyor, and a bulkhead for building an earthen ramp for loading. The standard 20,000-gallon liquid AC tank and 5,000-gallon fuel tank comprise part of the final chassis.