| http://www.w3.org/ns/prov#value | - ???In US land operations, single-control RCDs are the most common and can pose problems, particularly for stripping rubbers, which strip annulus returns from the drillstring and transfer drillstring rotational torque,??? he explained. ???Tripping pipe wears the stripping rubbers, making the failure of a single-control head a potentially hazardous situation, and stripper rubber materials don???t al
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