Piping or trough which directs drilling fluid from the rotary nipple to the surface drilling fluid system.

Source: API RP 13C, Recommended Practice on Drilling Fluids Processing Systems Evaluation, Upstream Segment, Fourth Edition, December 2010. Global Standards


Production/injection line, service line or pipeline through which fluid flows. NOTE In this part of ISO 13628, the term is used to describe solutions or circumstances of general nature related to a flowline.

Source: API RP 17A, Design and Operation of Subsea Production Systems—General Requirements and Recommendations, Fourth Edition, Reaffirmed 2011. Global Standards



Any pipeline connecting to the subsea tree assembly outboard the flowline connector or hub.

Source: API SPEC 17D, Design and Operation of Subsea Production Systems—Subsea Wellhead and Tree Equipment, Upstream Segment, Second Edition May 2011 (Errata September 2011). Global Standards



The piping which exits the bell nipple and conducts drilling fluid and cuttings to the shale shaker and drilling fluid pits.

Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards



“Flowline” means a pipeline that is used to transport fluids from a well to a production facility or vice versa, and includes intrafield export and all gathering lines (conduite d’écoulement).

Source: Canada Oil and Gas Installations Regulations, SOR/96-111, Canada, current to May 1, 2014. Regulations

Source: Canada Oil and Gas Installations Regulations, SOR/96-118, February 2013. Regulations

Source: Nova Scotia Offshore Petroleum Installations Regulations, SOR/95-191, Canada, current to May 31, 2012. Regulations

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