Abstract: An emergency redundant mounting flange is provided for incorporation into an oil-well blow-out-preventer (BOP), enabling rapid, tight-fitting attachment of an oil containment cap over a BOP outflow port in an emergency. This flange extends radially outward from the protected port, and includes an annular region with a connection feature, such as a ring of bolt-holes, permitting cap attachment. The cap, also provided, is a barrel-shaped diameter-reduction pipe which can be connected onto the emergency mounting flange at its bottom end, and onto a standard riser pipe at its top end, thus containing or stopping the flow of oil. After installation, the cap fully encloses the protected port, while creating a tight seal with the emergency mounting flange. Extension of these methods to bell-and-spigot plumbing fixtures, including reinforced concrete pipe, is also provided.

Abstract: A custom-manufactured clamshell plumbing fixture, or clamp, is provided, which precisely fits the irregular surface of a damaged oil-well riser pipe, or the surface of a blow-out-preventer, so as to tightly seal oil leaks. Using an optional gasket, the fixture functions as a plumbing adaptor with the damaged pipe at one joint, and a standard plumbing flange at another joint. Because of its rigid mechanical connection to the damaged pipe, a clamp of similar manufacture can also provide a solid platform for machine tools, allowing for reliable, precise cuts in damaged pipe or other devices, using a remote-controlled milling machine. The custom clamps are manufactured using techniques of digital object-capture and computer-controlled metal-working. Methods are discussed which can help to determine the exact shape of the surface to be sealed, and to manufacture and install the clamps and gaskets.