Diagram Of A Rig Circulating System

Spinning Chain And Cathead

Fig. 1.19-Example drawworks used in rotary drilling. Fig. 1.19-Example drawworks used in rotary drilling. Friction catheads shown in Fig. 1.20 turn continuously and can be used to assist in lifting or moving equipment on the rig floor. The number of turns of rope on the drum and the tension provided by the operator controls the force of the pull. A second type of cathead generally located between the drawworks housing and the friction cathead can be used to provide the torque needed to screw or...