Circular - Geological Survey
Universal joints attached to the shaft should be rigged up with extensions and large hand wheels to allow manual closing of the rams. ... ANNULAR PREVENTERS Annular blowout preventers are the most versatile type of preventer in that they can seal and even strip on pipe of ... Cutaway view of Hydril annular preventers.
| Title | : | Circular - Geological Survey |
| Author | : | Michigan. Geological Survey Division |
| Publisher | : | - 1979 |
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