Flow line
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A flow line, used on a drilling rig, is a large diameter pipe (typically a section of casing) that is connected to the bell nipple (under the drill floor) and extends to the possum belly (on the mud tanks) and acts as a return line (for the drilling fluid as it comes out of the hole), to the mud.
A flow line, used on a drilling rig, is a large diameter pipe (typically a section of casing) that is connected to the bell nipple (under the drill floor) and extends to the possum belly (on the mud tanks) and acts as a return line (for the drilling fluid as it comes out of the hole), to the mud.
Stinger Line
A stinger line is similar to a flow line, but unlike a flow line, it is not used to maintain circulation. The stinger line is attached to the blowout preventer to allow for the pressure from a blowout to be released. The stinger line usually will run parallel to the flow line.
See also
Drilling rig (petroleum) Flow show
References
Flow line
Text derived from https://en.wikipedia.org/w/index.php?oldid=1352975937 under CC BY-SA 4.0; modifications have been made.