OIL&GAS JOURNAL
Hydril annular blowout preventers permit piston stroke measurement through the vertical passage in the top of the head. ... from the top of the head to the top of the piston are stamped on the BOP head and are given in the Operatora#39;s Manual.
| Title | : | OIL&GAS JOURNAL |
| Author | : | |
| Publisher | : | - 1978 |
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