Definition(s)
Subsea BOP
Blowout preventer stack designed for use on subsea wellhead and wellhead assemblies, complete with redundant controls.
Source: API STD 53, Blowout Prevention Equipment Systems for Drilling Wells, Upstream Segment, Fourth Edition, November 2012. Global Standards
Subsea Blowout Preventer
A series of ram blowout preventers and annular blowout preventers designed to be installed as a unit on a subsea wellhead, tubing head, or subsea tree.
Source: API RP 96, Deepwater Well Design and Construction, First Edition, March 2013. Global Standards