Pinions instead of belts

Gravel plant reduces costs and maintenance

Summary

In many gravel pits, stone crushing plants and similar operations, conveyor belts are ­powered by shaft and belt drives. For a long time, this had also been the case at the gravel plant of NorStone AS in Tau, located in the southwest region of Norway (Fig. 1). However, recently NorStone, a subsidiary of the German HeidelbergCement AG, decided to change to robust geared motors. This option promised lower investment costs and increased ­operational reliability, along with better process safety. In addition to that, the operators anticipated an energy consumption reduction thanks to higher efficiency of the new drive systems.

1 The Norwegian producer NorStone

NorStone is Norway’s largest producer of gravel products. The company supplies aggregates for concrete and asphalt, stone cladding for coastal regions, and other special products. Each year, NorStone’s production facilities produce over 6.6 million tons of gravel products of various sorts and qualities. The demand is large, and even with its present annual production capacity of 2.3 million tons of material the Tau plant can scarcely meet the demand. It is therefore all the more important to ensure high availability of the plant and minimize unplanned downtime.

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