Bell Nipple (Mud Riser Flow Nipple)
Bell Nipple (Mud Riser Flow Nipple) : A piece of pipe, with inside diameter equal to or greater than the blowout preventer bore, connected to the top of the blowout preventer or marine riser with a side outlet to direct the drilling fluid returns to the shale shaker or pit. Usually has a second side outlet for the fill-up line connection. (RP 53)
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