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STANDARD HANDBOOK OF PETROLEUM & NATURAL GAS ...

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Rotary Equipment 619<br />

ighest Operating Position<br />

\<br />

1 go-<br />

- Length of Hose Traveled<br />

Stand Pipe<br />

Height<br />

t<br />

awest Operating Position<br />

f<br />

Figure 4-89. Rotary hose [15].<br />

Drill-Stem Subs<br />

Different types of drill-stem subs are shown in Figures 4-90 and 4-91. The<br />

classification of drill-stem subs is presented in Table 4-37.<br />

Swivel Sub<br />

The outside diameter of the swivel sub is at least equal to the diameter of<br />

the upper kelly box. The swivel sub should have a minimum of 8 in. of tong<br />

space length. The minimum bore diameter is equal to that of the kelly. The

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