Definition:
kelly spinner
1. n. [Drilling]
A mechanical device for rotating the kelly. The kelly spinner is typically pneumatic. It is a relatively low torque device, useful only for the initial makeup of threaded tool joints. It is not strong enough for proper torque of the tool joint or for rotating the drillstring itself. The kelly spinner has largely replaced the infamous spinning chains, which were responsible for numerous injuries on the rig floor.
Most Kelly Spinner problems lie in the pneumatic power units. Rotary vane, and Turbine style air driven motors with a gear reduction are the most common types. In most cases we can exchange your faulty power units for a freshly rebuilt unit. Give us a call to discuss availability. Complete rebuild services are also available.
