Photo courtesy of Howard I. Shapiro and Associates OSHA intends to push back a looming crane operator certification deadline to give regulators time to review the 2010 regulation. Related Links: Viewpoint: OSHA Crane Rules Must Change Viewpoint: OSHA Crane Rules Have Merit Crane operators may have three more years to pass exams while the U.S. Occupational Safety and Health Administration considers reopening its regulation on cranes and derricks. Some safety experts say they are glad to see OSHA reviewing the rules; however, feelings are mixed over the proposed testing delay."Safety has now been sacrificed," says Robert Weiss, vice president of
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.