Drilling and producing offshore
Of the four ram preventers, the blind shear usually is placed just below the annular preventer or is positioned so there is one pipe ram between it and the annular preventer. ... The lower, middle, and upper support frames are flanged and bolted to four large guide posts through which guidelines are run. ... Shaffer and Hydril rams have an automatic lock incorporated in their operating mechanisms.
| Title | : | Drilling and producing offshore |
| Author | : | R. Stewart Hall |
| Publisher | : | Pennwell Corp - 1983 |
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