دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a 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.

n: a pneumatically operated device mounted on the top of the kelly which,when actuated ,causesthe kelly to rotate.it may be used to make connections by spanning up the kelly.

a pneumatic device fitted to the top of the kelly that can spin the kelly.