Definition(s)
Auxiliary Line
Rigid line attached to the outside of the riser main tube [exclusive of the choke and kill (C/K) lines]; e.g. hydraulic supply line, mud boost line, air line.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards
Auxiliary Line
A conduit (excluding choke and kill lines) attached to the outside of the riser main tube. Example: Hydraulic supply line, buoyancy control line, mud boost line.
Source: API RP 16Q, Recommended Practice for Design, Selection, Operation and Maintenance of Marine Drilling Riser Systems, First Edition, November 1993 (Reaffirmed August 2001). Global Standards
Source: ISO 13624-1:2009, Petroleum and natural gas industries – Drilling and production equipment – Part 1:Design and operation of marine drilling riser equipment. Global Standards
Auxiliary Line
Conduit (excluding choke and kill lines) attached to the outside of the riser main pipe. EXAMPLES Hydraulic supply line and annulus circulation line.
Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards
Auxiliary Line
An external conduit (excluding choke and kill lines) arranged parallel to the riser main tube for enabling fluid flow. Examples of these lines include a control system fluid line, a buoyancy control line, and a mud boost line.
Source: API SPEC 16R, Specification for Marine Drilling Riser Couplings, Exploration and Production Department, First Edition, January 1997. Global Standards