Kelly bushing (KB)
18 July 2017Key seat
18 July 2017Kelly bushing (KB)
18 July 2017Key seat
18 July 2017A pneumatically operated device mounted on top of the kelly that, when actuated, causes the kelly to turn or spin. It is useful when the kelly or a joint of pipe attached to it must be spun up, that is, rotated rapidly for being made up.
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