Rotary Kelly Bushing

Bushing that rotationally connects the rotary table to the drill string kelly bar, the top of which is commonly used as vertical reference for the drill floor.

Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards

Rotary Kelly Bushing

Bushing that sits on top of the rotary table.

  • NOTE: It transmits torque from the rotary table to the kelly and is commonly used as a reference for vertical measurements from the drill-floor.

Source: ISO 13624-1:2009, Petroleum and natural gas industries – Drilling and production equipment – Part 1:Design and operation of marine drilling riser equipment. Global Standards

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