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2. Special Patrol Insertion/Extraction - Wikipedia

   en.wikipedia.org/wiki/Special_Patrol_Insertion/...

   It is an adaptation of the STABO rig. [1] Generally, the SPIE rope is lowered into the pickup area from a hovering helicopter. Patrol personnel, each wearing a harness with an attached carabiner, hook up to a D-ring inserted in the SPIE rope. A second safety line is attached to a second D-ring located above the first.

3. D-ring - Wikipedia

   en.wikipedia.org/wiki/D-ring

   A D-ring used to secure cargo in a utility trailer (A) D-ring (shown in isometric view) (B) Weld-on pivot link; note the incorrect fillet weld call-out (bottom-right). The correct method of securing a weld-on pivot link is a [t weld] which consists of a perpendicular vee butt joint secured to the billet using a butt weld or fusion weld.

4. Deep hole drilling - Wikipedia

   en.wikipedia.org/wiki/Deep_hole_drilling

   For small diameters, length-to-diameter ratios of up to l/D ≤ 100 can be achieved, in special cases even up to l/D = 900. [ 2 ] [ 3 ] [ 4 ] With large diameters, the l/D ratio is usually limited by the travel or the bed length of the deep hole drilling machine.

5. Worm, parcel and serve - Wikipedia

   en.wikipedia.org/wiki/Worm,_parcel_and_serve

   Working steps Serving in action The standing rigging belonging to this yard (such as the black-coated lift ending at the right edge of the picture) is wormed, parcelled and served, and painted, as described below. To worm, parcel and serve a line is to apply a multi-layered protection against chafe and deterioration to standing rigging. It is a ...

6. List of components of oil drilling rigs - Wikipedia

   en.wikipedia.org/wiki/List_of_components_of_oil...

   Suction line (#3) is an intake line for the mud pump to draw drilling fluid from the mud tanks. Swivel (#18) is the top end of the kelly that allows the rotation of the drill string without twisting the block. Traveling block (#11) is the moving end of the block and tackle. Together, they give a significant mechanical advantage for lifting.

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