Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Rotationil preventers<br />
Rotational preventer is always positioned<br />
at the top of the stack above annular<br />
preventer.<br />
It is used when differential pressure at<br />
the wellhead does not exceed 34,5 10 5<br />
Pa (500 PSI),<br />
and in such situation it must enable<br />
manipulation (withdrawing and embedding)<br />
and rotation of drill stem through the closed<br />
working (sealing) element.
Change language