BG 25 / 2011 / 2254_BG25_en_0000498763_V01
Table Kelly equipment components description
Generates rotary movement and torque for the
drilling tool and/or casing tube.
Its final gear is driven by planetary gears which
take power from hydraulic motors.
Serves as a connector between the cardan joint
and the casing tube and transfers the torque.
Absorbs shocks from the Kelly bar.
Transfers torque from rotary drive to casing drive
adapter and prevents torsional stress.
Transfers torque from rotary drive to Kelly bar.
Consists of telescoping tubes the total length of
which determines the achievable depth of the bore.
It transfers torque from the rotary drive to the drill-
ing tool.
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