Petrobras, Brazil’s state-run energy giant, has formally opened South America’s largest-capacity natural-gas pipeline, the 179-kilometer Gasduc III, near Rio de Janeiro, which required tunneling 3.8 km through Santana Mountain. The 40-million-cu-m-per-day, 38-in.-dia pipeline was built by Odetech, a joint venture of Odebrecht and Techint Engenharia. It is the largest-dia gas pipeline in South America.The pipeline awaits the completion later this year of the Caraguatatuba-Taubaté (GASTAU) gas pipeline, which will receive gas coming from the Santos Basin in the Atlantic Ocean.
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.