New product announcements: 05/19/2010 Air-powered Saw: Cuts Panels and Pipe The Esco APS-438 Air-Powered Panel Saw can be used to make cuts in stainless-steel, super-duplex stainless-steel, inconel, concrete-lined pipe and other hard construction materials. The saw comes with a standard fiberglass-reinforced blade or an optional carbide-tipped steel blade and makes a 43⁄8-in.-deep cut. The APS-438 easily can attach to boiler panels using a pair of weld tabs or a quick clamp for trimming new panels. A rigid chain-mounted clamp system allows for single-pipe work. The saw is powered by a 3-hp motor and requires only 80 cfm per minute. Esco
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.