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The drill bit consists of: heavy rods, drill rods, drive rod, reducers and fittings. After a certain number of operating hours for a subassembly, some parts, more difficult to request, have an advanced state of wear, which makes it impossible to continue functioning of the respective assembly. In the tubular bases, the rods brought from the yard are identified, sorted and pre-directed. If they are clogged, they are cleaned with very long drills. For a good cleaning, the rods are left for a time in a room containing a solution of detergents and caustic soda. Then the rods are washed on the outside and inside, with water jets and rotary plastic fiber brushes. Afterwards, they are dried with hot air. After correcting their rectilinearity, with hydraulic presses, the actual control begins. Measure the length, outer diameter, wall thickness and, using the methods below, detect any operating defects.

Review Concerning the Conditioning and Reconditioning of Drilling Ships