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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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626 Drilling and Well Completions<br />

1<br />

I<br />

9" 27' 45" f 2' 30"<br />

PIN DRIVE<br />

KELLY BUSHING<br />

PIN DRIVE<br />

MASTER BUSHING<br />

Figure 4-98. Pin-drive master bushing [13].<br />

( 7 - 1 3 1<br />

(text continued from page 623)<br />

The API requirements for rotary table openings for square drive master bushings<br />

and the sizes of the square drive and pin-drive master bushings are specified in<br />

API Specification 7 [l].<br />

Kelly Bushings<br />

The kelly bushing attaches the kelly to the rotary table. It locks into the master<br />

bushing and transfers the torque produced by the table to the kelly. There are<br />

two types of kelly bushings [16]:<br />

1. Square drive kelly bushings (aligned with square drive master bushings)<br />

2. Pin drive kelly bushings (aligned with pin-drive master bushings)

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