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A drawworks is the primary hoisting machinery component of a rotary drilling rig.Its main function is to provide a means of raising and lowering the traveling block.The wire-rope drill line winds on the drawworks drum and over the crown block to the traveling block, allowing the drill string to be moved up and down as the drum turns.
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.
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.
The break-in period required has changed over the years with improved piston ring materials and designs. In reference to small engines, the break-in period now (5–10 hours) is short in comparison with that of engines of the past. Aluminum cylinder bore engine piston rings break-in faster than those used on cast iron cylinder bores. [2]
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.
Harnesses from the front View of harness from above-rear. A horse harness is a device that connects a horse to a horse-drawn vehicle or another type of load to pull. There are two main designs of horse harness: (1) the breast collar or breaststrap, and (2) the full collar or collar-and-hames.
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