Bell Nipple - Bell Nipple Flange

Bell Nipple Flange is usually used on conventional land drilling rig and connected with the top of the blowout preventer (BOP stack).

Bell nipple flange usually does not hold well pressure, but acts as a fastening equipment to connect a vertical pipe, we name this vertical pipe as bell nipple, The top end of the bell nipple usually is flared, or belled, to guide drill tools into the hole and usually has side connections for the fill line and mud return line.

A short length of pipe (a nipple) installed on top of the blowout preventer or marine riser with a side outlet to direct the drilling fluid returns to the shale shaker or pit.