New product announcements: 03/11/2009 Hydraulic Breaker: For Mid-Sized Carriers The HB 3600 hydraulic breaker attachment is designed for carriers in the 35-to-63 tonne weight class. The breaker delivers up to 560 blows per minute and accepts a maximum hydraulic flow of 79 gallons per minute at 2,610 psi. It can be used for demolition, trenching, foundation work, tunneling, rock mining and secondary breaking. An automatic shutoff feature prevents any damage if excess hydraulic pressure is delivered by the carrier. Atlas Copco; 413-746-0020; www.atlascopco.com Illumination: Light Tower Supplies Power The ML30 EX light tower features 1,250 W parallel lamps and can
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.