BELL NIPPLE
Definition
A <BELL NIPPLE> is an <ARTEFACT> and a large diameter <PIPING NETWORK SEGMENT> fitted to the top of the blowout preventers that the flow line attaches to via a side outlet, to allow the drilling fluid to flow back over the shale shakers to the mud tanks. Also an enlarged pipe at the top of a casing string that serves as a funnel to guide drilling tools into the top of a well