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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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620 Drilling and Well Completions<br />

Figure 4-90. Drill-stem subs [13].<br />

Rotary Pin or Box Connection<br />

TYPE B<br />

LH Pin<br />

Connection<br />

36"<br />

(see note<br />

48"<br />

(see note 2) I<br />

t<br />

ma.<br />

i<br />

Figure 4-91. Types of drill-stem subs [13].<br />

swivel sub is furnished with a pin-up and a pin-down rotary shouldered connection.<br />

Both connections are left handed.<br />

Kelly Cock and Lower Kelly Valve<br />

The kelly cock and lower kelly valve are manually operated valves in the<br />

circulating system.

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