Integral style C/WO riser is a riser in which the pressure-containing conduits are mounted into a common assembly or joint. NOTE 1 An integral riser is typically classified as either jacketed or non-jacketed. The integral riser joint allows the production and annulus lines to be made up simultaneously. NOTE 2 A jacketed C/WO riser can also contain hydraulic control lines inside the structural housing. This type of riser is typically used in applications where high tensile or bending loads are anticipated.
Source: API RP 17G, Recommended Practice for Completion/Workover Risers, Second Edition, July 2006 (Reaffirmed April 2011). Global Standards