English to Portuguese Tech/Engineering Petroleum Eng/Sci

In contrast, the component of the Deepwater Horizon's blowout preventer that the article focuses on wasn't redundant, and authorities now say it should have been. The component is called a *** blind shear ram ***. It's a pair of very large, very scary clippers built to slice through the drilling rig's steel pipe and shut off a well that's gone out of control. The blind shear ram is the last line of defence once all the other methods to gain control of the flow of oil have failed. The thing is, according to a study of 15,000 wells by drilling inspection company Det Norske Veritas, in the 11 cases where crews had to call on the blind shear ram, they only worked fully six times.