Four major oil companies said on Feb. 17 they are ready to deploy an interim system to cap future leaks in deepwater oil wells, paving the way for deepwater activity to resume. The system was created by the Marine Well Containment Co., a consortium formed by ExxonMobil, Shell, ConocoPhillips and Chevron after the Bureau of Ocean Energy Management, Regulation and Enforcement required that such a system be in place before it issues any new deepwater drilling permits in the Gulf of Mexico. The new device, made by Trendsetter Engineering, Houston, includes a subsea capping stack with the ability to either
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.