Abstract: This invention refers to a device that has a direct applicability in the oil industry, detecting on a prevention basis, failures that may be externally visualized on the walls of the risers. Externally coupled to a pipe in free catenary, called riser, the device involves such a pipe in its entire perimeter and allows for the making of non-destructive inspections of several natures concurrently, while the device moves along all its extension. The device moves along the riser downwards and upwards by a combination of gravity, buoyancy, thrusters and action of expansion of gases.

Abstract: The present invention refers to a process to permit descent to sea bottom, with the use of two conventional tug boats, of equipment used in submarine field oil field exploration, especially descent of equipment of large size and mass in deep water fields. Equipment is being suspended by a sling, attached to an auxiliary component. This, on its turn, is attached to two cables, each one activated by one of the two tug boats. Connection of the auxiliary component to cables is being made by means of connectors, which are trespassed thru cable openings and attached to auxiliary component by screws, forming a connection, in which connectors may carry out a pivotal movement around holes of auxiliary component. This movement of said connectors almost entirely absorbs oscillations of tug boats caused by waves, without transmitting same to equipment. In this way, both tug boats may lower equipment and cross the so-called resonance area without risk of its occurrence.

Abstract: The present invention refers to a floating auxiliary structure, similar to a floating rigid portal, of simple construction and low cost, designed to facilitate moving of equipment of large sizes and mass in sea operations. With the aid of the auxiliary floating structure of the present invention, equipment of large size and mass, for exporting oil production, for example, may be transported until site and lowered into sea with the use of two conventional tug boats. The invention also includes the procedure for removal of equipment from main tug boat and its descent until the sea.