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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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-<br />

@,<br />

(6)<br />

4" I.F., 4 1/2" I.F.<br />

or 4 1/2" F.H.<br />

Top Sub<br />

2 1/4" ID -<br />

4 112" 1.F. /<br />

Rotary Equipment 623<br />

(4<br />

<strong>STANDARD</strong><br />

6 1/2", 6 318"<br />

or 6 1/4" OD<br />

4 1/2" I.F.<br />

/<br />

2 13/16" ID-<br />

(C)<br />

4" I.F., 4 1/2" I.F.<br />

or 4 1/2" F.H.<br />

Figure 4-93. Lower kelly valve (mud saver) [16].<br />

shown in Figure 4-96. As the rotary table turns, the master bushing, the kelly,<br />

the drill pipe, and the bit also turn. The rotary table is driven by the drawworks.<br />

Master Bushings<br />

There are two types of master bushings:<br />

1. Square drive master bushings (Figure 4-97)<br />

2. Pin drive master bushings (Figure 4-98)<br />

(text continued on page 626)

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