Photo by Tudor Van Hampton for ENR Liebherr's HS-8300HD crawler crane hangs the pressure tanks under a catwalk. YouTube Liebherr's Pactronic hydraulic-hybrid system was first implemented on harbor cranes. Related Links: Caterpillar's New Hybrid Excavator Offers Savings at a Small Price Bauma 2013 Equipment Expo Attracts Record Visitors As fuel prices keep climbing, the business case becomes stronger for hybrid power on heavy equipment. But the payoff period for heavy-duty hybrids is still fuzzy, and equipment designers face the tough decision of which technology to pick.Excavators consume a large amount of fuel when swinging back and forth between digging and
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.