Auxiliary lines are an integral part of offshore drilling riser joints and need to combine fatigue resistance, high strength and weldability. Choke and kill lines are pressure lines giving access to the well bore including when BOP is closed. Fluid can be pumped into the kill line and gas can be flowed out of the choke line. Mud boost lines are used as conduits for drilling fluid which is pumped into the riser just above the BOP stack to increase annular circulating velocities. In all cases, safety is paramount.
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