Definition(s)
Drill Floor Substructure
The foundation structure on which the derrick, rotary table, draw-works, and other drilling equipment are supported.
Source: API RP 64, Recommended Practice for Diverter Systems Equipment and Operations, Second Edition, November 2001 (March 1, 2007). Global Standards
Drill Floor Substructure
The foundation structure(s) on which the derrick, rotary table, drawworks, and other drilling equipment are supported.
Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards