Input horsepower
18 July 2017Instrumentation
18 July 2017Input horsepower
18 July 2017Instrumentation
18 July 2017Any one of several types of valve installed in the drill stem to prevent a blowout through the stem. Flow is possible only downward, allowing mud to be pumped in but preventing any flow back up the stem. Also called an internal blowout preventer.
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